I, Checks and Adjustments - topdogtest.com · I, Checks and Adjustments This section contains...
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I, Checks and Adjustments
This section contains procedures to check the specifications and measurementlimits listed in Table 2-1. The Specification or Measurement Limit Is listed at thebeginning of each part as well. These procedures contain only check steps, sincethe SD-24 TDR/Sampling Head has no internal adjustments. The pads in thissection provide a logical sequence of checks for performing a comprehensiveperformance verification procedure to verify that the sampling head meetsspecifications. To functionally test the sampling head, perform the parts Inlable 2-1 which have a “yes” indication in the Functional Test Column.
Refer to the SD-24 TDRISamp!ing Head Installation/User Reference manual formore Information about specifications and sampling head operation. Refer toTable 2-2 for information concerning test equipment used in the setups.
Part 1 Power-On none none yes
Part 2 Dot Itansient Response250 mywith automatic �59~errorcalibration
yes
500 my with automatic �59~errorcalibration
no
500 my with default ±20%errorsettings
no
1.0 V without automaticcalibration
adjusted to100% at 1 V
no
Pan 3 OffsetOffset ±2mV yes
Offset change withrepetition rate
±5my no
Part 4 Noise (SN 8020652 and above)Smoothing, on �550 pM rmsSmoothing, off �1.2 my mis
no
Part 4 Noise (SN 8010651 and beiow)Smoothing, on �900 sV rmsSmoothing, off . �2 my rrns
no
.
Part 5 Rise lime 17.5 ps yes
Table 2-1 Measurement Limitsand Specifications
Part and Description Measurement SpecificationUmit
FunctionalTest
42-1SD-24 Service Reference REV Nov 1989
- . < . . . - - . .e -m. - . . .
TEK . INTER-OFFICE COMlvllJNlCATlON .- .
Sohn Martin 94-540 TO 3:. ' t Juno 25, 1991
FWW Frank Gray, SO-PAT
M3KC.T GIDEP permit request
In response to the request to grant permission to the Government Industry Exchange Pro ram Tektronix operator, service and P
(GPDEP) to reproduce nstruction manuals,
Tektronix, Inc. hereby grant6 such permission for distribution of such documents to any GTDEP user that is a full participant in the Metrology Data Interchange Data Base of GIDEP provided that all copies of the original work include the entire copyright notice and ownership statement exactly a-& it appears in the original, together with the Legend "Reproduded with pemieeion,a
This permission has been approved by the Intellectual
aeon% 1[ Committee of Tektronix
ded and a copy of this memo may
to GIDEP to provide'the requested permission.
g:&dy Group Pat&t Coun&al
Checks and AdJusW7ents
Table 2-1 — Measurement Limits and Specifications (cont)
Part and Description Measurement Specification FunctionalLimit Test
Part 6 Acquisition Aberrations no(with 067-1338-00 source)
Oto300ps -7%tol2%300psto5ns ±4%SnstolOOns ±1.2%100 ns arid up +0.6%—lOnsto—2Ops ±4%
Part 7 Coincidence Between 10 Ps flOChannels
Part 8 MaxImum Signal 1% of step noVoltage amplitude
Part 9 Isolation Between 1% nochannels .
Part 10 Output Amplitude 250 my+5mV
yes
Part 11 TDR Aberrations noOto300ps —5%tolS% .
300psto5ns ±3%Snsandup ±1%—lOnsto—2Ops ±3%
Part 12 Reflected Rise Time • 35 Ps no
S C
(~.
2-2 REV JUN 1959 SD-24 Seniice Reference Manual
Checks and Adjustments
Test Equipment The test equipment in Table 2-2 contains suggested test equipment for use In thismanual. Procedure steps are based on the test equipment examples given, butother equipment with similar specitications may be substituted. Test results, setupinformation, and related connectors and adapters may be aitered by the use ofdifferent equipment.
4
Table 2-2 — Test Equipment
DescriptIon MinimumSpecificatIon
Examples of ApplicableTest Equipment
11800-Series Oscillo- Tektronix digital TEKTRONIX 11801 Digitalscope sampling oscilloscope Sampling Oscilloscope
TEKTRONIX 11802 DigitalSampling Oscilloscope
Pulse Generator 1 ns rise tIme, 5 Voutput, 10 Hz to250 Mhz frequencyrange
TEKTRONIX PG 502 PulseGenerator with aTM 500-Series PowerModule
Time Masl Generator 1 ns through 5 smarkers In a 1-2-5sequence, at least 5parts in 10~accuracy
TEKTRONIX TG 501 TimeMail< Generator with aTM 500-Series PowerModule
Calibration Generator
.
DC othput, 0.5%accuracy 1 V outputamplitude
TEKTRONIX PG 506Calibration Generator with aTM 500-Series PowerModule
Calibration Step TSCTRONIX 067-1338-OXGenerator
!
Calibration Step Generator(where X represents either a0, 1, 2,3, 5, ore: dependingon the power supplyappropriate for your country.Refer to Section 5,Replaceable Parts)
System Controller Any compatible control-ler with MS DOS and a
TEKTRONIX PEP 301System Controller
serial port configuredfor COM1
.
so a Termination, Impedance 50 (1. SMA Tektronix Part 015-1022-00SMA connectors connectors
50 a Termination, Impedance, 50(1, BNC Tektronix Part 011-0049-01BNC connectors connectors
Precision Short Circuit Female 3.5mm Tektronix Part 011-0150-00Termination compatible connectors
Precision 6-Inch Semi- Male to male 3.5 mm Tektronix Part 015-0564-00Rigid Cable compatible connectors
SD-24 Serv/ce Reference Manual REV JUN 1989 2-3
Checks and Adjustments
Examples of ApplicableTest Equipment
table 2-2 — Test Equipment (cant)
Description MinimumSpecification
Short CircuitTerminators, SMAConnections(2 required)
Male SMA Connectors Tektronix Part 015-1020-00
.
Coaxial Cable, so a(2 required)
so a, 36-Inch, maleBNC connectors
Tektronix Part 012-0482-00
Serial Cable 10-ft R5-232-Q Cable Tektronix Part 012-0911-00
Adapter, SMA to BNC(2 required)
SMA male to BNCfemale
Tektronix Part 015-0554-00
Attenuator, 2X 6 dB attenuation, 50 £2,one male and onefemale BNC
Tektronix Part 011-0069-02
Attenuator, 5X 14dB attenuation,50 LI, one male andone female BNC
TektronIx Part 011-0080-02
Wrist Strap Tektronix Part 008-3415-00
Static Control Mat Tektronix Part 006-3414-00
Needle-nose pliers
Pozidrive Screwdriver P1 tip
S
S
S
(
(.
2-4 REV JUN 1939 SD-24 SeN/ce Reference Manual
Checks and Adjustments
Using These Each part begins with a setup illustration that shows what test equipment is5 Procedures needed and how to connect It. Refer to Table 2-2 for an example of the testequipment for each part.
Conventions In this ManualIn these procedures, the following conventions are used:
• CAPITAL letters within the body of text identify front panel controls, indicators,and connectors (for example, MEASURE) on the oscilloscope and samplinghead.
• Hold letters identify menu labels and display messages.
• initial Capital letters identify connectors, controls, and indicators (forexample, Position) on associated test equipment. Initial Capital letters alsoIdentify adjustments inside the sampling head.
In some steps, the first word is italicized to identify a step that contains aperformance verification and/or an adjustment instruction. For example, if CheckIs the first word In the title of a step, an electrical specIfication is checked. IfAdjust appears in the title, the step involves an electrical adjustment. If Examine isthe firm word in the title, the step concerns measurement limits that Indicatewhether the sampling head Is operating properly; these limits are not to beinterpreted as !lectrical specifications.
initialized and Stored SettingsAt the beginning of most steps, the user is instructed to Initialize the oscilloscopeas part of the setup, The initIalIze feature, available throughthe UTILITY menu,presets all oscilloscope controls and functions to known values. Initializing theoscilloscope at the beginning of a step eliminates the possibility of settings tomprevious parts causing erroneous or confusing results.
Menu Selections and Measurement lbchnlques
Details on measurement techniques and instructions for making menu selectionsare generally not included In this manual. Comprehensive descriptions of menusand oscilloscope features are located in the 11801 User Reference manual,thel 1802 User Reference manual, and the SD-24 TDR/Sampling HeadInstallation/User manual.
Tutorial ManualThe tutorial manuals, IntroducIng the 11801 Digital Sampling Oscilloscope andIntroducing thel 1802 Digital Sampling Oscilloscope, are strongly recommendedto tamiharize the first-time user with 11801 and 11802 Oscilloscope controls andfeatures.
SD-24 SeN/ce Reference Manual REV JUN 1989 2-5
C/i~cksand Adjustments
0
(notlnstalI~d
yet)
Procedure to Power-on
~ Step 1: Set the following In the order listed:
Sampling head Not installed yet11801/11802 Oscilloscope
ON/STANDBY switch STANDBY
fl Step 2: Install an SD-Series sampling head in the osculoscopes left-mostcompartment,
~ Step 3: With the oscilloscope’s rear panel PRINCIPAL POWER SWITCH setto OFF, connect the 11801/11802 Oscilloscope to a suitable power source.
~ Step 4: Set the rear panel PRINCIPAL POWER SWITCH to ON and then theoscilloscope’s front panel ON/STANDBY Switch to ON.
Part 1 Perform this part within the ambient temperature range Of + 18 and + 28~C, toPower-on assure proper oscilloscope operation.
Setup to Power-on
11801
(
0
(notinstalled
yet)
(
SeWp10 Power-on
2-6 REV JUN 198~ SD-24 Service Reference Manual
Part I Power-on
When the 11801/11802 Oscilloscope Is first installed, the rear panelPRINCIPAL POWER SWITCH should be set to and remain in the ON position.Then, use the front panel ON/STANDBY switch to perform all subsequentpower switching.
E Step 5: Power-on the following test equipment, so that it Is warmed up withthe oscilloscope to be tested:
• Calibration generator
• Calibration step generator
• Time mark generator
• Pulse generator
A complete lIst of test equipment is listed in Table 2-2.
• Allow a 20 mInutewarm-up for the Sampling head and test equipmentbefore doing the performance checks.
50-24 Service Reference REV NOV1989 2-7
Checks and Adjustments
Part 2Dot Transient
Response
This part shows the setup and lists the procedures to check the dot transientresponse.The dot transient response is examined at 250 my and 500 my withautomatic calibration settings, at 500 my with default settings, and checked atwith manual calibration settings.
Measurement LimIts
The measurement limits for the dot transient response error are:
�5 % error when measured at 250 my and 500 my with automatic calibrationsettings
• 20% error when measured at 500 my with default
SpecificationsThe specification for the dot transient response at 1 Vadjustable to 100%
Setup to Check Dot Transient Response
is that the amplitude is
Check Dot Transient Response
2X Attenuator(not connected yet)
SD-24 Service Reference Manual
Part 2 Dot TransientResponse
I,
Procedure to Check Dot ‘Tpanslent Response
C Step 1: initialIze the oscilloscope settings, thenin the order listed:Sampling head
OH 1 SELECT CHANNEL On/Off11801/11802 Oscilloscope
VertSlze:M1TRIGGER button
SourceMain PoeMain Size
Pulse GeneratorBack Terminator buttonTagger SourceOutput
make the following settings
On
50 mV/dMsionpress
Internal ClockMm
20 ns/dlvision
pull outExternal Trigger
square wave
Examine Dot Response at 250 my with Automatic Calibration Settings—by
performing Steps 2 through 30.
Q Step 2: Set the pulse generator’s amplitude for a 375 mV display.
o Step 3: Set The Vert Offset: Ml so that the step is approximately centeredon the screen.
C Step 4: Press the ENHANCED ACCURACY button, and then touch LoopGain.
fl Step 5: ibuch Automatic Calibrate and then Proceed in the Loop GainCalibration pop-up menu.
o Step 6: Touch Exit in the Loop Gain Calibration pop-up menu.
o Step 7: Set the pulse generator’s amplitude for a 250 mV step display.
o Step 8: Press the WAVEFORM button, and then touch Horizontal Desc.
o Step 9: Touch Main Record Length in the Horizontal Description pop-upmenu, and then set the top knob for a Main Record Length of 512.
D Step 10: Press the UTIUTY button and then instr Options.
~ Step 11: Set Vectored itace to Off In the Instrument Options pop-upmenu.
0 Step 12: Touch Display Intensity in the instrument Options pop-up menu,and then set the top knob for 90% intensity.
~ Step 13: Touch Exit,
o Step 14: Touch Cursors on the top of the screen.
o Step 15: Touch Cursor Type and then Horizontal Bars in the Cursor Typepop-up menu.
SO-24 Service Reference REV NOV 1969 2-9
Part 2 Dot Transient Response
C Step 16: Touch Exit.S C Step 17: Set Cursor 1 (top knob) to the average of the bottom of the pulse
before the step.
C Step 18: Set Cursor 2 (bottom knob) to the top of the step.
o Step 19: Read ~V as the peak-to-peak step amplitude, and then record thisvalue as V for later use.
C Step 20: Press the ENHANCED ACCURACY button.
C Step 21: Touch Loop Gain and then the channel you are using In the LoopGain CalibratIon pop-up menu,
C Step 22: Set the Divide by iwo Mode to On in the Loop Gain Calibrationpop-up menu.
C Step 23: touch Exit in the Loop Gain Calibration pop-up menu,
o Step 24: Touch Cursors at the top of the screen,
C Step 25: Set Cursor 1 to the average of the bottom of the pulse before thestep,
C Step 26: Set Cursor 2 to the average of the bottom of the pulse under the
step.
C Step 27: Read AV, and then record this value as VL for later use, (
C Step 28: Set Cursor 2 to the average of the top of the pulse.
C Step 29: Read AV, and then record this value as VH for later use.
o Step 30: ExamIne that the negative dot response en’or ((—VL/VH) x 100%]is �5%
C Step 31: ExamIne that the positive dot response error (100 % x (Vii--V)/(V—Vt.)] is �5%.
Examine Dot Response at 500 my with Automatic Calibration Settings—byperfonTling Steps 31 through 50.
o Step 32: Press the ENHANCED ACCURACY button.
C Step 33: Touch Loop Gain, and then set Divide by iwo Mode to Off in theLoop Gain Calibration pop-up menu.
C Step 34: Touch Exit.
o Step 35: Set the Vert Slze:M1 to 100 mV/div.
C Step 36: Set the puise generator’s amplitude for a 500 my step display.
o Step 37: Touch Cursors on the top of the screen,
E Step 38: Set Cursor 1 to the average of the bottom of the pulse before the
—— step.
2-10 SEV NOV1989 Checks and Adjustments
Part 2 Dot TransientResponse
C Step 39: Set Cursor 2 to the average of the tO~of the pulse.
C Step 40: Read SV as the peak-to-peak step amplitude, and then record thisvalue as V for later use.
C Step 41: Press the ENHANCED ACCURACY button.
C Step 42: Touch Loop Gain and then the channel number you are using inthe Loop Gain Calibration pop-up menu.
C Step 43: Set Divide by iwo Mode to on in the Loop Gain CalibratIonpop-up menu.
C Step 44: Touch Cursors at the top of the screen.
C Step 45: Set Cursor 1 to the average of the bottom of the pulse before thestep.
o Step 46: Set Cursor 2 to the average of the bottom of the pulse after the
step.C Step 47: Read the AV value, and then record this value as Vt. for later use.
o Step 48: Set Cursor 2 to the average of the top of the pulse.
fl Step 49: Read ~V,and then record this value as VH for iater use.
C Step 50: ExamIne that the negative dot response error R—VL/VH) x 100%]is �5%.
C Step 51: Examine that the positive dot response error (100 % x (VH—V)/(V—VL)] is �5%.
Examine Dot Response at 500 mV with default settings—by performing Steps
51 through 59.
C Step 52: Press the ENHANCED ACCURACY button.
C Step 53: Touch Loop Gain and then Recall Defaults in the Loop GainCalibration pop-up menu.
C Step 54: Touch Exit,
C Step 55: touch Cursors at the top of the screen.
C Step 56: Set Cursor 1 to the average of the bottom of the puise before thestep.
C Step 57: Set Cursor 2 to the average of the bottom of the pulse after thestep.
C Step 58: Read the ~V value, and then record thIs value as Vt. for later use.
C Step 59: Set Cursor 2 to the average of the top of the pulse and read ~V,Record this value as Vii,
80-24 Service Reference REV NOV 1989 2-11
Pafl2 Dot Transient Response
C Step 60: Examine that the magnitude of the negative dot response error[(-VL/VH)x 100%] Is �20%. (
Check Dot Response at 1V with Manual Calibration Settings—by perfomling
Steps 60 through 70.
C Step 61: Press the ENHANCED ACCURACY button.
C Step 62: Touch Loop Gain, and then set the Divide by iwo Mode to Off In
the Loop Gain Calibration pop-up menu.C Step 63: Touch Exit.
C Step 64: Remove the 5X attenuator, and then connect the 2X attenuator tothe channel you are using and the coaxiai cable,
C Step 65: Set the Vert Size:M1 to 200 mv/div.
o Step 66: Set the pulse generator’s amplitude for a 1 v *2% step display.
C Step 67: Press the ENHANCED ACCURACY button.
C Step 68: touch Loop Gain and then the channel number you are using Inthe Loop Gain Calibration pop-up menu.
C Step 69: Set the Divide by iwo Mode to On, and then touch ManualCalibrate In the Loop Gain Calibration pop-up menu.
o Step 70: Thuch Exit. (
C Step 71: Check that the amplitude of the pulse, measured from the averageof the level under the pulse to the average of the top of the pulse, can be setwith the manual calibration settings to be ~1V
C Step 72: Repeat steps 2 through 71 for channel 2.
Checks and Adjustments2-12 REV NOV 1989
Part 3 This part shows the setup and lists the procedure to examine offset and checkOffset offset change with repetition rate.
Measurement LImItSThe measurement limit for the offset is±2my.
SpecificationsThe specification for the offset change with repetition rate Is ±5mV.
Setup to Examine Offset
Procedure to Examine Offset
0 Step 1: InitialIze the oscilloscope settings, then make the following settingsin the order listed:
Sampling headCH 1 SELECT CHANNEL On/Off
11801/11802 OscilloscopeTRIGGER button
SourceENHANCED ACCURACY button
Calibrate All pop-up menu
On
pressinternal Clock
pressRecall Defaults
1,
CH1 50(1 Tem7inaUon
CH 1 50(1TermlnaUQn
Setupto Examine Offset
50-24 Se,vice Reference REV NOV 1989 2-13
Pad 3 Offset
0 Step 2: Touch Offset Null In the ENHANCED ACCURACY major menu.
El Step 3: Touch Manual Calibrate in the Offset Nulllng pop-up menu.
C Step 4: Touch the Offset Null; Ml, select 0, and then Enter In the NumericEntnj & Knob Res pop-up menu.
C Step 5: Touch the vertical icon, and then set Vert Size: Ml to 50 mV/div.
C Step 6: Press the MEASURE button.
o Step 7: Touch Measurements and then Mean in the Measurements pop-upmenu.
C Step 8: Touch Mean in the MEASURE major menu, and then set Datalntervai to whole zone in the Mean pop-up menu.
C Step 9: ExamIne that Mean Is 0 V ±200my.
C Step 10: Press the ENHANCED ACCURACY button, and then touch OffsetNull,
o Step 11: Touch Automatic Calibrate and then Proceed In the OffsetNulling pop-up menu.
0 Step 12: Press the MEASURE button.
C Step 13: Examine that the Mean (offset) IsO ±2my.
o Step 14: Repeat steps 2 through 13 for Channel 2.
(
(
0
2-14 REV NOV1989 Checks and Adjustments
Setup to Check Offset Change with Repetition Rate
Checks and AdjustmentsPart 3 Offset
50(1 Termination
50(1 Termination
Procedure to Check Offset Change with Repetition Rate
C Step 1: Initialize the oscilloscope settings, then make the following settingsin the order listed:
Sampling headCH 1 SELECT CHANNEL On/Off
11801/11802 OscilloscopeENHANCED ACCURACY button
Calibrate All pop-up menulime mark generator
Marler (seC)
On
pressRecall Defaults
0.2~s
50(1 Termination
Setupto Check Offset Change with Repetition Rote
SD-24 Service Reference Manual
Checks andAdjustmentsPart 3 Offset
E Step 2: Press the TRIGGER button, and then touch Level.
fl Step 3: Set the ~frigLevel until a trace appears.
o Step 4: Touch the Vertical icon, and then set the Veil Size: Ml to 2 mV/dIv.
C Step 5: Set Veil Offset: Ml so that the trace is vertically centered on the
screen.0 Step 6: Set the time mark generator’s marker setting to 10 ms.
fl Step 7: Press the WAVEFORM button, and then touch Acquire Deso.
C Step 8: Set Average N to On, and then touch Set Avg N.
Li Step 9: Set Average N to 8 with the top knob.
C Step 10: Walt until the Acquire Desc selector In the WAVEFORM major
menu shows that eight averages have been completed.C Step 11: Press the MEASURE button.
C Step 12: touch Measurements and then Mean In the Measurementspop-up menu.
C Step 13: Touch Compare & References in the MEASURE major menu.
C Step 14: Touch Save Current Meas Values as References, and then setCompare to On.
0 Step 15: Set the time mark generator’s marker setting to 5 ms. (
C Step 16: Wait until the Acquire Desc selector in the WAVEFORM majormenu shows that eight averages have been completed.
~ Step 17: Check that AMean (offset with a repetition rate) is 0+5 my.
C Step 18: Continue to decrease the time mark generator’s marker setting,and repeat Step 17 for each setting down to 0.1 pS.
C Step 19: Press the CH 2 SELECT CHANNEL button.
o Step 20: Disconnect the 50 (1 termination from the OH 1 input and connect itto the OH 2 Input.
o Step 21: Repeat Steps 4 through 18 for OH 2.
0
2-16 REV JUN 1989 50-24 Service Reference Manual
This part shows the setup and lists the procedures to check noise.
Measurement Limits (SN 5020652 and above)The measurement limit for noise is 1.2 my without smoothing and 550 jiV withsmoothing.Measurement Limits (SN 8020651 and below)
The measurement limit for noise is 2 my wWioUt smoothing and 900 ~Vwithsmoothing.Setup to Examine Noise
r-~II ~JlIL~iL~
c~~
IC-L~-~/
~U~
I~l
U
Lq~J
Procedure to Examine Noise
Li Step 1: Initialize the oscilloscope settings, then make the following settingsin the order listed:
Sampling headCl-Il SELECT CHANNEL On/Off
11801/11802 OscilloscopeTRIGGER button
SourceENHANCED ACCURACY button
Calibrate All pop-up menu
On
pressInternal Clock
pressRecall Defaults
Part4Noise
11801CM I 50(1 Termination
/
J 12” RF C~b!e(not connected yet)
CH 1 50(1 7brmlnatlon
12” RF C2bIe
Setup to Examine Noise
SD-24Service Reference REV NOV 1989 2-17
--—.-..-......-.-....iPart 4 Noise
C Step 2: Touch Loop Gain in the ENHANCED ACCURACY major menu.
* 0 Step 3: DIsconnect the 50 11 termination from the Cli 1 Input and connectthe CALIBRATOR to the CH 1 Input through the 12 inch RF cable.
C Step 4: Touch the channel number you are using, Automatic Calibrate, andthen Proceed in the Loop Gain Calibration pop-up menu.
C Step 5: DIsconnect the CALIBRATOR from the CH 1 input and reconnect the50 atemllnatiorl,
C Step 6: Press the WAVEFORM button, and then touch Acquire Desc.
C Step 7: Set Average N to On.
C Step 8: Press the AUTOSET button.
C Step 9: Touch the vertical Icon. If theVeil Size: Ml is not at 2 mV/div, thenset the Veil Size: Ml to 2 mV/div.
[I] Step 10: Touch Def Wa at the top of the screen.
C Step 11: In the Vertical DescrIptIon pop-up menu, touch the followingselectors In the order given:• Mainframe.1
• •Avg( (• Mainframe
.1
.)• Enter Desc
C Step 12: Press the MEASURE button, and then touch Measurements.
C Step 13: Touch RMS In the Measurements pop-up menu, and then RMS Inthe MEASURE major menu.
C Step 14: Set Data Interval to whole zone in the RMS pop-up menu.
C Step 15: Examine that RMS is �1.2my. (SN B020652 and above)Examinethat RMS is �2 my. (SN 8020651 and below)
[J Step 16: Press the WAVEFORM button.
C Step 17: Touch Sampling Head Fnc’s, and then set Smoothing to On In theSampling Head Functions pop-up menu.
C Step 18: Press the MEASURE button,
C Step 19: . Examine that the RMS Is �550~V.(SN B020652 and above)Examine that the RMS is �900~V,(SN B010651 and below).
C Step 20: Repeat steps 2 through 19 for channel 2.
2-18 REV NOV1989 Checks and Adjustments
Checks and Ad/usfments
Rise limeThis part shows the setup and lists the procedure to check the rise time.
SpecificationsThe specification for the sampling head rise time is 17.5 pa.
Setup to
Procedure to Check Rise Time
Step 1: InitIalize the oscilloscope settings, then make the followingin the order listed:
Sampling headCH 1 SELECT CHANNEL On/Off On
Rise lime
Calibration StopGenerator
Calibration StepGenerator
CalibrationStepGenerator
remote head Calibration StepGenerator
powersupply
Setup to Check Rise Time
SD-24 Seivlce Reference Manual
11801/11802 OscilloscopeENHANCED ACCURACY button
Calibrate All pop-up menuTRIGGER button
SourceCalibration step generator
ON/STANDBY switch
C Step 2: Press the AUTOSET button.
~ Step 3: Press the WAVEFORM button, and then touch Horizontal Desc.
O Step 4: Touch Main Record Length,afld then set Main Record Len to 5120
with the top knob.C Step 5: Touch Acquire Desc In the WAVEFORM major menu.
O Step 6: Set Average N to On, and then touch Set Avg N.
Li Step 7: Set Average N to 128 wIth the top knob.
C Step 8: Touch the horizontal icon, and then set the Main Size to 100 na/div.
Li Step 9: Touch Main Pos and then Set to Mln in the Numeric Entry & KnobRes pop-up menu.
Li Step 10: Press the MEASURE button.
O Step 11: Touch Measurements and then Rise In the Measurements pop-up (menu.
~ Step 12:Off in the
C Step 13:
C Step 14:
O Step 15:
O Step 16:pulse 10
Li Step 17:step is at
C Step 18:
C Step 19:screen.
O Step 20:
~ Step 21:
Checks aridAdjustmentsPart 5 Rise Time
i (.!.~.1pressRecall Defaults
pressInternal Clock
ON
Touch Rise in the MEASURE major menu, and then set Wacklng to
Rise pop-up menu.
Set the Main Size to S ns/div,
Touch Baseline In the Rise pop-up menu.
Touch a blank portion of the screen to exit this menu.
Set the Baseline (bottom knob) to the average of the bottom of thens before the step.
Touch the horizontal icon, and then set the Main Pos so that thethe left-most edge of the screen.
Set the Main Size to 20 ps/div.
Set the Main Pos so that the step is approximately centered on the
Touch Rise in the MEASURE major menu.
Record the Mean: value in the Rise pop-up menu tar later usa
2-20 REV JUN 1959 SD-24 Service Reference Manual
Pan 5 Rise Time
Li Step 22: Calculate the sampling head rise time with the following formula:
sampling head — J(Mean : value)2 - (Calibration Step Generator rise)2
rise time —
Note that Calibration Step Generation rise is read from the calibration stepgenerator.
0
O Step 23:
C Step 24:
Check that the sampling head rise time is �17.5 ps.
Repeat steps 2 through 23 for channel 2.
SD-24 Service Reference REV NOV 1989 2-21
Checksand Adjustments
—7% � aberration % �12%
—4% C aberration % �4%
-1.2% � aberration % <1.2%
-0.6% � aberration % �O,6%
—4% � aberration % �~%
Part6AcquisitionAberrations
This part shows the setup and lists the procedures to check acquisitionaberrations.
Measurement LimitsThe measurement limits for acquisition aberrations are listed in ThbIe 2-3,Aberrations Specifications.
Tabie 2-3
Time Difference from the Minimum Specification
Rising Edge of Waveform
Oto300ps
300 ps to 5 ns
— Aberrations Specifications
5 nato 100 ns
100 ns and up
—lonsto—2Ops
S
(
(
(c
2-22 REV JUN 1989 SD-24 Setv/ce Reference Manual
S
S
Setup to Examine Acquisition Aberrations
11801
Checks ~ndAdjustmentsPart 6 Acquisition Aberrations
Procedure to Examine Acquls Won Aberrations
Li Step 1: Initialize tile oscilloscope settings, then make the following settingsin the order listed:
Sampling headCH1 SELECT CHANNEL On/Off On
11801/11802 OscIlloscopeENHANCED ACCURACY button press
Calibrate All pop-up menu Recall DefaultsTRIGGER button press
Source Internal ClockCalibration step generator
ON/STANDBY switch OF’1
Li Step 2: Press the WAVEFORM button, and then touch AcquIre Desc.
Calibration StepGenerator
remote head CailbratIon StepGenerator
powersupply
11802
Calibration StepGenerator
remote head Calibration StepGenerator
powersupply
Setup to Examine Acquisition Aberrations
St~24Se,vice Reference Manual REV JUN 1989 2-23
Checks andAdjustmentsPart 6 Acquisition Aberrations
fl Step 3: Set Average N to On, and then touch Set Avg N,
S Li Step 4: Set Average N to 128 wIth the top knob,
E Step 5: Press the AUTOSET button.
fl Step 6: Touch the horizontal icon, and then set the Main Size to 100 na/div.
fl Step 7: Set the Main P05 so that the rising edge of the step is at theleft-most edge of the screen.
Li Step 8: Touch the vertical icon, and then set the Veil Oftset:M1 so that theaverage of the top of the pulse from 100 ns after the step to the right edge ofthe screen is at the horizontal centerline.
0 Step 9: Set the Vert Size: Ml to 2 mV/div.
Li Step 10: Touch Veil Offset: Ml and then Fine in the Numeric Entry & KnobRes pop-up menu.
~ Step 11: Set Veil Offset: Ml so that the average of the top of the pulsefrom 100 ns after the step to the right edge of the screen Is at the horizontalcenterline.
Li Step 12: Examine that The magnitude of the maximum positive and negativeaberration occurrIng 1 OOns after the step is �0.75vertical divisions from thehorizontal centerline (0.6% of the step amplitude).
Li Step 13: Toucfl the horizontal Icon, and then set the MaIn Size to ions/div.
Li Step 14: Set the Main Pos so that the rising edge of the step is at the (ieft-rnost edge of the screen.
fl Step 15: Examine that The magnitude of the maximum positive and negativeaberration occurring 5 ns to 100 ns after the step is �i 5 vertical divisionsfrom the horizontal centerline (1.2% of the step amplitude).
Li Step 16: Set the Main Size to 500 ps/div and then the Main Pos so that therising eage of The step is at the left-most edge of the screen.
Li Step 17: Examine that the magnitude of the maximum positive and negativeaberration occurrIng 300 ps to a ns after the step is �5.Overtical divisionsfrom the horizontal centerline (4-0% of the step amplitude).
~ Step 18: Touch the horizontal icon, and then set the Main Size to 500 ns/div.
~ Step 19: Touch the vertical icon, and then set the Veil Slze:M1 to 10 mV/div.
Li Step 20: Set the yen Offset:M1 so that the average of the top of the pulsefrom 100 ns after the step to the right edge of the screen is at the horizontalcenterline.
fl Step 21: Touch the horizontal icon, and then set the Main Size to 50 pa.
Li Step 22: Set the Main Pos so that the rising edge of the step Is at the
left-most edge of the screen,
S
2-24 REV JUN 1989 SD-24 Sen’ice Reference Manual
Part 6AcquIsitionAberrations
0
Li Step 23: Examine that the magnitude of the maximum positive aberratIonoccurring in the first 300 ps after the step is �3.0vertical divisions from thehorizontal centerline (12% of the step amplitude).
Li Step 24: ExamIne that the magnitude of the maximum negative aberrationoccurring in the first 300 pa after the step Is �i .75 vertical divisions from thehorizontal centerline (7% of the step amplitude),
Li Step 25: Thuch the Main Pos selector and then Set to Mm In the NumericEntry and Knob Res pop-up menu.
Li Step 26: Set the Main Size to 10 na/div.
Li Step 27: Touch the vertical icon, and Then set Veil Offset:M1 so that theaverage of the bottom of The pulse 10 ns before the step is at the horizontalcenterline.
Li Step 28: Touch the horizontal icon, and then set the Main Size to 1 ne/div.
Li Step 29: Set the Main P03 so that the rising edge of the step Is at theright-most edge of the screen.
El Step 30: Examine that the magnitude of the maximum positive and negativeaberration occurring iOns to 500 pa before the 10% point of the step is�1.0 vertIcal divisions from the horIzontal centerline (4% of the stepamplitude)
E Step 31: Set the MaIn Size to 50 ps/div and then the MaIn Pos so that therising edge of the step Is at the right-most edge of the screen.
Li Step 32: Examinethat the magnitude of the maximum positive and negativeaberration occuning 500 psto 20 ps before the 10% point of the step is�1 .0 verticai dMsions from the horizontal centerline (4% of the stepamplitude)
El Step 33: Repeat steps2 through 32 for channel 2.
SD-24 Service Reference RE~NOV 1989 2-25
Checks and Adjustments
CoincidenceBetween Channels
This part shows the setup and lists the procedures to check the coincidencebetween channels.
SpecificationsThe specification for the coincidence between channels is lOps,
Setup to Check CoIncidence Between Channels
Procedure to Check Coincidence Between Channels
Li Step 1: initialize the oscIlloscope settings, then make the followingin the order listed:
Sampling headCH 1 SELECT CHANNEL On/Ott On
Calibration StepE~ønørato,
Calibration StepGenerator
Calibration StepGenerator
Calibration StepGenerator
Check Coincidence Between Channels
~SD-24ServiceReference Manual
Checks and AdjustmentsPart 7 CoIncidence Between Channels
11801/11802 OsculoscopeENHANCED ACCURACY button
Calibrate All pop-up menuTRIGGER button
SourceCalibration step generator
ON/STANDBY switch
~ Step 2:
E Step 3:
LI Step 4:with the
LI Step 5:
LI Step 6:
~ Step 7:
Eli Step 8:connectbutton.
~ Step 9:
LI Step 10:
~ Step ii:Acquire
LI Step 12:
fl Step 13:
screen.~ Step 14: Press the STORE/RECALL button.
LI Step lb: Touch Trace 2 in the Store Trace pop-up menu.
LI Step 16: Touch Recall Trace In the STORE/RECALL major menu.
LI Step 17: Touch STO I in the Recall Stored Trace pop-up menu.
~ Step 18: Disconnect the calibration step generator remote head tram CR2,connect it to CH 1, and then press the CR 1 SELECT CHANNEL On/Offbutton.
LI Step 19: Press the MEASURE button.
fl Step 20: TouCh Measurements and then Prop Delay in the Measurementspop-up menu.
~ Step 21: Touch Prop Delay in the MEASURE major menu and then Trace 3ri the Prop Delay pop-up menu.
LI Step 22: Check that the magnitude of the Prop Delay is �10 p5.
pressRecall Defaults
pressInternal Clock
ON
Press the AUTOSET button.
Press the WAVEFORM button, and then touch Horizontal Desc.
Touch Main Record Length, and then set Main Record Len to 1024top knob.
Touch Acquire Desc in the WAVEFORM major menu.
Set Average N to On, and then touch Set Avg N.
Set Average N to 64 with the top knob.
Disconnect the calibration step generator remote head from OH 1,it to OH 2, and then press the CR 2 SELECT CHANNEL On/Off
S
0
Press AUTOSEt
Select the horizontal Icon, and tnen set the Main Size to 10 ps/div.
Touch Acquire Desc, and then set Average N to On In theDescription pop-up menu.
Touch Exit,
Set the Main Pos so that the step is approximately centered on the
50-24 Service Reference Manual REV JUN 1989 2-27
Checks and Adjustments
Maximum Signal voltage.Voltage
Trigger Input
Trigger Input
This part shows the setup and lists the procedure to examine the maximum s~gna~
Measurement Limit
The measurement limit for the maximum signal voltage is 1% of th~stepamplitude.
Setup to Examine Maximum Signal Voltage
LJa] _i
~ULLTuggerOu~.ut
50 C~CoaxialCablef6si Rise
PositiveOutput
FastRise50 fl Coaxial Cable Po~ith~eOutput
Setup to Examine Maximum Signal
SD-24 Service A~lerenceManual
Checks and AdjustmentsPart B Maximum Signal Voltage
Procedure to Examine Maximum Signal Voltage
S LI Step 1: nitialize the oscilloscope settings, then make the following settingsIn the order listed:
Sampling headOH 1 SELECT CHANNEL On/Ott.. On
11801/11802 OscIlloscopeENHANCED ACCURACY button press
Calibrate All pop-up menu Recall DefaultsTRIGGER button press
Slope -MaIn Size 5 ~s/dlv
Calibration generatorAmplitude maximum amplitudePeriod lOILsVar adjustment mid range
fl Step 2: Touch the vertical Icon, and then set the Vert Offset: Ml so that thewaveform is vertically centered on the screen.
LI Step 3: Set the calibration generator’s amplitude so that it displays a 1 Vpeak-to-peak square wave.
LI Step 4: Touch the horizontal icon, and then set the Main Size to 500 ns/div.
LI Step 5: Set the Main Pos so that the positive-going step is near theleft-most edge of the screen (within 1/2 division).
LI Step 6: Press the WAVEFORM button.
LI Step 7: Touch Acquire Deso, and then set Average N to On in the AcquireDescription pop-up menu.
LI Step 8: Touch Set Avg N,and then set Average N to 128 with the tO~knob.
LI Step 9: Touch the vertical icon, and then set the Veil Offset: Ml so that theaverage of the top of the pulse 500 ns after the step is on the horizontalcenterline.
LI Step 10: Set Vert Slze:M1 to 5 mV/div.
fl Step 11: Touch Veil Offset Ml and then Fine in the Numeric Entry & KnobRes pop-up menu.
~ Step 12: Set Veil Offset: Ml so that the average of the top of the pulse 500ns after the step is on the horizontal centerline.
LI Step 13: Set the Main Size to 200 ns/div.
LI Step 14: Examine that the magnitude of the maximum positive and negativeaberration from 200 ns to 800 ns from the rising edge of the step is �2vertical divisions uom the horizontal centerline (1 % of the step amplitude).
fl Step 15: Touch the horizontal icon, and then set the Main Size to 20 ns/div.
50-24 Service Reference Manual REV JUN 1989 2-29
Checksand AdjustmentsPail B Maximum Signal Voltage
E Step 16: Set the Main Pos so that the step is near the left-most edge of thescreen (within 1/2 division) (
E Step 17: Examinethat the magnitude of the maximum positive and negativeabelTation from 10 ns to 200 ns from the rising edge of the step is �2verticaldivisions torn the horizontal centerline (1% of the step amplitude).
E Step 18: Repeat all of Part 8 for CH 2.
S.
C
2-30 REV JUN 1989 SD-24ServiceReference Manual
Checks and Adjustments
Isolation BetweenChannels
Sofl Termination
This part showsthe setup and lists the procedures to check the isolation bet’Neenchannels.
Specifications
The measurement limit for the isolation between channels is
Setup to Check Isolation Between Channels
Procedure to Check Isolation Between Channels
Step 1: Initialize the oscilloscope settings, thenin the order listed:
Sampling headC11 1 SELECT CHANNEL On/Off
the following settings
On
Calibration StepGenerator
Calibration StepGenerator
Calibration£fepGenecatorpowerwpply
check Isolation Between Channels
SD-24 Se,vic~Peference Manual
Checks and Adjus~nent~Pail 9 Isolation Between Channels
11801/11802 OscIlloscopeENHANCED ACCURACY button press (
Calibrate All pop-up menu ......,.....,.. Recall DefaultsTRIGGER button press
Source Internal ClockCalibration step generator
ON/STANDBY Switch ON
[] Step 2: Press the AUTOSET button.
~ Step 3: Touch the horizontal icon, and then set the Main Size to 200 ps/dIv.
~ Step 4: Press the WAVEFORM button, and then touch Horizontal DeSc.
~ Step 5: •lbuch Main Record Len9th, and then set Main Record Len to 1024with the top knob.
~ Step 6: Touch AcquIre Desc In the WAVEPORM major menu.
El Step 7: Set Average N to On, and then touch Set Avg N In the AcquireDescription pop-up menu.
~ Step 8: Set Average N to 1024 with the top knob.
[I] Step 9: Press the CH 2 SELECT CHANNEL button on the sampling head.
~ Step 10: Touch the vertical icon, and then set the Vert Size: M2 to 2 mV/div.
~ Step 11: Touch Acquire Desc in the WAVEFORM major menu, and then set (Average N to On.
~ Step 12: Wait until the Acquire Dasc selector in the WAVEFORM majormenu shows that 1024 averages have been completed.
~ Step 13: Touch the MEASURE button.
~ Step 14: TOuch Measurements and then Peak-Peak In the Measurementspop-up menu,
~ Step 15: Record the OH 2 Peak-Peak measurement for later use.
El Step 16: PresstheCH 1 SELECTCHANNEL button.
Li] Step 17: Touch Measurements and then Peak-Peak in the Measurementspop-up menu.
~ Step 18: Record the OH 1 Peak-Peak measurement for later use.
LI Step 19: Check that (CH 2 Peak-Peak/OH 1 Peak-Peak) x 100% �1%.
E Step 20: Disconnect the calibration step generator remote head from OH 1and the 50 fl termination from CH 2. Connect the calibration step generator toOH 2, connect the 50 (~termination to OH 1, and then press the CH 2SELECT CHANNEL On/Off button,
S~ Step 21: Press the AUTOSET button.
~ Step 22: TouCh the horizontal icon, and then set the Main Size to 200 pS/div.
2-32 REV JUN ~989 S~-24Sen//ce Reference Manual
Part 9 IsolatIon Between Channels
El Step 23: Press the Cl-I 1 SELECTCHANNEL button.
S ~ Step 24: Press the AUTOSE~button.
El Step 25: Press WAVEFORM button.
El Step 26: Wait until the Acquire Desc selector in the WAVEFORM majormenu shows that 1024 averages have been completed.
El Step 27: Press the MEASURE button.
[J Step 28: Touch Measurements and then Peak-Peak in the Measurementspop-up menu.
El Step 29: Record the CH 1 Peak-Peak measurement for later use,
D Step 30: Press the Cl-I 2 SELECT CHANNEL button.
Q Step 31: Record the OH 2 Peak-Peak measurement for later use.
El Step 32: Checkthat (CM 1 Peak-Peak/0H2 Peak-Peak) x 100% �1%.
S
SD-24 Serv/ce Reference SEV NOV 1989 2-33
Checks and Adjustments
S
Part 10 This part shows the setup and lists the procedures to check the output amplitude.Output Amplitude
SpecificationsThe specification for the output amplitude is 250 my ±5my.
Setup to Check Output Amplitude
11801CH I
I /
CH 1 sonToimination11802
rjiII -‘II -fl
L~L~)~
..b
IC—sJ-~-~-H irn;
~:[a~J~j
Setup to Check OutputAmplitude
Procedure to Check Output AmplItude
El Step 1: Initialize the oscilloscope settings, then make the foilowing settingsin the order listed:
Sampling headCM 1 SELECT CHANNEL On/Off..
11801/11802 OscilloscopeENHANCED ACCURACY button . -
Calibrate All pop-up menu . . -
TRIGGER buttonSource
El Step 2: Press the WAVEFORM button,
On
pressRecall Detaults
pressInternal Clock
and then touch Acquire Desc.
S
sOCTennination
Lc1~/ ~-
L~l~jLp.b[~m
C.
CS El Step 3: Set Average N to On, and then touch Set Avg N
2-34 REV JUN 1989 SD-24Sen//ce Reference Manual
Past10 OutputAmplitude
El Step 4: Set Average N to 64 with the top knob.
S El Step 5: Touch Sampling Head Fnc’s in the WAVEFORM major menu, andthen set the Clii TDR to On.
El Step 6: Press the AUTOSET button.
El Step 7: Touch the horizontal Icon, and then set the Main Size to 100 ns/dlv,
El Step 8: Touch Main Pos and then Mm In Main Pos pop-up menu.
El Step 9: Press the ENHANCED ACCURACY button,and then touch TDRAmplitude.
El Step 10: Touch AutomaticCalibrate andthen Proceed in the TDRAmplitude pop-up menu.
El Step 11: Touch Cursors at the top of the screen.
o Step 12: Touch Cursor Type and then HorIzontal Bars.
El Step 13: Touch Exit to exit this menu.
El Step 14: Set Cursor 1 (top knob) to the average of the base of the pulse.
El Step 15: Set Cursor 2 to the average of the top of the pulse 100 ns after the
step.o Step 16: CheckthatAVls2sOmV±5mV,
(5 El Step 17: Press the WAVEFORM button.
D Step 18: Touch Sampling Head Fnc’s, and then set the TDR Polarity to —
in the SamplIng Head Functions pop-up menu.o Step 19: Touch Exit to exit this menu.
El Step 20: Touch the vertical icon and set the Veil Offset; Ml so that the step
is centered on the screen.El Step 21: Touch Cursors at the tO~of the screen.
~ Step 22: Set Cursor 1 (top knob) to the average of the base of the pulse.
0 Step 23: Set Cursor 2 to the average of the top of the pulse 100 ns after thestep.
El Step 24: Check that .SV is -250 mV ±5my.
El Step 25: Repeat all of Part 10 for CH 2.
0
5D-24 Serv/ce Reference REV NOV1989 2-35
Checks and Adjustments
Partii This part shows the setup and lists the procedures to check the TOR aberrat%ons.TDR Aberrations
SpecificationsThe specifications for TDR aberrations are listed in Table 2-4, AberrationsSpecifications,
Table2-4 — Aberrations Specificat/ons
S
S
Time Difference fromthe Rising Edge ofWaveform
MinimumSpecification
Measurement Limit
Oto300ps . —5% �aberration�i 5%
%
Soopstosns -3%�aberration%0%
5 ns and up ‘—1% � abeiTation 96±1%
-ions to —20 Ps —3% � aberration %�3%
.4
(
(.
2-36 REV JUN 1989 SD-24Serv/ce Reference Manual
Checks and AdjustmentsPart 11 TDR Aberrations
LJ~/ ~i
L L[L~I~J L!J1
Procedure to Check TDR Aberrations
i:i~Step 1: InitIalize the oscilloscope settings, then make the following settingsin the order listed:Sampling head
CH1 SELECT CHANNEL On/Off .. •.......... On11801/11802 Oscilloscope
ENHANCED ACCURACY button pressCalibrate All pop-up menu Recall Defaults
TRIGGER button pressSource Internal Clock
Press the WAVEFORM button, and then touch Acquire Desc.
Set Average N to On, and then touch Set Avg N.
Set Average N to 128 with the top knob.
Touch Sampling Head Fnc’s in the WAVEFORM major menu, andthe CM 1 TDR to On in the Sampling Head Functions pop-up menu.
Press the ENHANCED ACCURACY button, and then tOuch TDR
Step 2:
Step 3:
Step 4:
Step 5:then set
Step 6:Amplitude.
(5Setup to Check TDR Aberrations
11801CM I 50 ~ITermination
/
CM 1 50(~Terrni,,e.rlon
Setupto CheckTOR Aberrations
ElElElEl
El
SD-24 ServiceReference Manual REV JUN 1989 2-37
Part 11 rDR Aberrations
Li Step 7: Touch Automatic Calibrate and then Proceed in the TDRAmplitude pop-up menu.
Li Step 8: Press vie AUTOSETbutton.
Li Step 9: Touch the horizontal icon, and then set the Main Size to 100 na/div.
Li Step 10: Set the Main Pos so that the rising edge of the stepis at theleft-mostedge Ot the screen.
Step 11: Touch the vertical icon, anø then set the Veil Offset:M1 so that theaverage of the top of the pulse 100 ns after the step is at the horizontalcenterline,
fl Step 12: Set the Veil Size: Ml to 2 mV/div.
Li Step 13: Touch yen Offset: Ml and then Fine in the Numeric Entry & KnobRes pop-up menu.
Li Step 14: Set Veil Offset: Ml so that the average of the top of the pulse100 ns after the step Is at the horizontal centerline.
Li Step 15: Touch the horizontal icon, and then set the Main Size to 10 ns/dlv.
Li Step 16: Set the Main Pos so that the rising edge of the step l~at theleft-most edge of the screen.
Li Step 17: Check that the magnitude of the maximum positive and negativeaberration occurring 5 ns after the step to the right edge of the screen is
�1.25 vertical dMsions from the horizontal centerline (1% of the stepamplitude).
Li Step 18: Set the Main Size to 500 ps/div7 and then set the Main Pos so thatthe rising edge of the step Is at the left-most edge of the screen.
Li Step 19: Check that the magnitude of the maximum positive and negativeaberration occurring 300 ps to 5 ns alter the step is �3.75vertical divisionsfrom the horizontal centerline (3% of the step amplitude).
Li Step 20: Touch the horizontal icon, and then set the Main Size to 500 ne/div.
Li Step 21: Touch the vertical icon, and then set the Veil Slze:M1 to 10 mV/div.
Li Step 22: Set the Veil Offset:M1 so that the average of the top of the pulse100 ns after the step is at the horizontal centerline.
Li Step 23: Touch the horizontal icon, and then set the Main Size to 50 ps/div.
Li Step 24: Set the Main Pos so that the rising edge of the step is at the’left-most edge of the screen.
Li Step25: Examine that the magnitude ot the maxImum positive aberrationoccurring in the fIrst 300 ps after the 90% point of the step is �3.75verticaldivisions from the horizontai centerline (15% of the step amplitude).
2-38 REV JUN 1989 Checks andAdjustments
Part•11 TDR Aberrations
S
Step 26: ExamIne that the magnitude of the maximum negative aberrationoccurring in the first 300 PS after the 90% point of the step Is �1.25 verticaldivisions from the horizontal centerline (5% of the step amplitude).
E Step 27: Set The Main Size to 2 ns/cliv,
E Step 28: Touch the Main Pos selector and then Set to Mm In the NumericEntry and Knob Flea pop-up menu.
D Step 29: Touch the vertical icon, and then set yen Oflset:M1 so that theaverage of tne bottom of the pulse 10 ns before the step is at the horizontalcenterline.
fl Step 30: Touch the horizontal icon, and then set the Main Size to 1 ns/div.
Step 31: Set the Main P03 50 that the rising edge of the step is at the
right-most edge of The screen.E Step 32: Check that the magnitude of The maximum positive and negative
aberration occurring iOns to 500 ps betore the 10% point of the step is �1 .0vertical dMsions from the horizontal centerline (4% of the step amplitude).
D Step 33: Set the Main Size to 50 ps/div and then the Main Pos so that therising edge of the step is at the right-most edge of the screen.
[~ Step 34: Check that the magnitude of the maximum positive and negativeaberration occurring 500 pa to 20 ps before the 10% poInt of the step is ~1.0vertical dMsions from the horizontal centerline (4% of the step ampiitude)
C) Step 35: Press the WAVEFORM button.
C) Step 36: Touch Sampling Head Fnc’s, and then set the TDR Polarity to - in
the Sampling Head Functions pop-up menu.C) Step 37: Repeat Steps 2 Through 36.
SD-24 Sesv!ce Reference REV NOV 1989 2-39
Checks and Adjustments
6~Precision Semi-Rigid Cable
Precision ShortC(rcuit Termination
This part shows the setup and lists the procedures. to check the reflected risetime.
Specifications
The specification for the reflected rise time is 35 ps.
Setup to Check Reflected Rise Time
CM I
r Precision Semi-Rigid Cable
Precision She,1 Chcuit Thm,ination
Procedure to Check Reflected Rise lime
C) Step 1: initialize the oscilloscope settings, thenin the order listed:
(
Sampling headCH 1 SELECT CHANNEL On/Off
11801/11802 OscilloscopeENHANCED ACCURACY button
Calibrate All pop-up menuTRIGGER button
Source
On
Part12Reflected Rise Time (.
CH I
Setupto CheckReflectedRiseTime
make the following settings
pressRecau Defaults
pressInternal Clock
2-40 REV JUN 1980 StJ~24ServiceReference M~fluaI
Pan 12 Reflected Rise Time
Li Step 2: Press the WAVEFORM button,and then touch Acquire Dese.
Li Step 3: Set Average N to On, and then touch Set Avg N.
Q Step 4: Set Average N to 128 with the top knob.
~ Step 5: Touch Sampling Head Fno’s from the WAVEFORM major menu, and
then set the (*11 TOR to On.Li Step 6: Press the AUTOSET button.
Li Step 7: Touch the horizontal icon, and then set the Main Size to 5 ns/div.
Q Step 8: Touch the Main Pos selector and Then Set to Mm in the Numeric
Entry and Knob Rn pop-up menu.Li Step 9: Press the MEASURE button, and then touch Measurements.
Li Step 10: Touch Fall In the Measurements pop-up menu and then Faii In theMEASURE major menu.
Li Step 11: Set tacking to Off, and then touch Thpllne in the Fail pop-upmenu,
Li Step 12: Touch lbpiine In the MEASURE major menu and then Fine in theNumeric Entry & Knob Res pop-up menu.
Li Step 13: Set the Toplmne (top knob) so that It is 250 my above the Baseiine.
Li Step 14: Touch the horizontal icon, and then set the Main Pos so that thereflection step is at the left-most edge of the screen.
fl Step 15: Set the Main Size to 20 ps/div and then the Main Pos to centerreflection step on the screen.
Li Step 16: Check that Fall (reflected rise time) is �35PS.
Li Step 17: Press the WAVEFORM button.Li Step 18: Toucfl Sampling Head Fnc’s, and then set the TDR Polarity to —
in the Sampling Head Functions pop-up menu.
Li Step 19: Touch Exit.
Li Step 20: Repeat Steps 6 through 16 for a negative TDR pulse, Note that allFali selections must be replaced with Rise selections for a negative TDRpulse.
fl Step 21: Repeat steps 2 through 20 for channel 2.
.2-41SO-24Service Reference REV NOV 1989