LEADER 3100D
Transcript of LEADER 3100D
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LEADER 3100D
On December 13, 2009, Yahoo auctioned a junk of
LEADER 3100D of 100 MHz DSO (Digital Storage
Oscilloscope) with 5,500 yen including tax.
Waveforms can be stored in memory and displayed.
Of course, it can also be used as a real display analog
oscilloscope.
There is also a lead-out function, it is very convenient.
Sensitivity · Voltage and time (frequency) etc. can be
found without counting the sweep range or screen
mesh.
Recently, the used price of the cathode ray tube
oscilloscope is decreasing. Is it because of the LCD TV
boom in the world? If it was five years ago, you can buy an oscilloscope that is over 50,000 yen in second hand at less
than 10,000 yen. The CRT oscilloscope is still easier to capture the fine waveform change than the digital ossescope.
Fixed price vs If you consider used prices, it may be worth more than the vintage FM tuner.
The auction comment from the auctioneer is below
I recently acquired it, it was able to be used normally for several days but suddenly the waveform is no longer
displayed
Waveform display can not be performed for both CH1 and CH2.
Adjusting the vertical position and the horizontal position only works CH2. Things like horizontal lines will move
accordingly.
Both lead-out cursors can be selected and move normally.
The lead-out character is displayed, and when you change the setting the display changes accordingly.
The exhibit is below
3100D body
Probe × 2
AC power cord
Front panel cover (LC-2074 optional 5,600 yen)
Copy of instruction manual × 2 volumes
The appearance is suitable for a year and there is no
big dent or scratch
There are no scratches and dirt on the waveform
display surface and it is very beautiful.
The knobs and buttons on the front panel are
beautiful.
There is no dust on the rear fan and it is beautiful.
The handle is locked normally at the desired angle.
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I checked it as it was being sent
Allele ~ ~ ~ There is not a bad place anywhere! ! !
The power supply will be on properly and the display lamp will be initialized.
When you enter the measurement signal, the trigger is honed properly and the waveform is displayed.
Lead-out cursor also appears and its measurement is normal.
Waveform digital storage function is also normal.
There is no burn-in tube burning, the focus is good, the observed waveform converges considerably fine and
good.
Although it is beautiful on the whole, there are dirt like scratches.
The problem was reproduced after 1 day! ! !
Immediately after obtaining it was normal but the defect was reproduced on the next day. Auction is as
commented on.
Is there a problem occurrence timer structured in this 3100D? What? What?
I tried opening the cover
The picture on the right is an interior view from
the top. It is an orderly making like a measuring
instrument. Click on the picture to view the
enlarged picture.
The chassis is made of aluminum plate.
The cathode ray tube is Toshiba 150CWB31.
I am using a high-grade glass epoxy substrate
that was subjected to a green resist.
The two large boards seen from the top are
the Control & Digital section. The LATTICE GAL 16
VBA - 25 QP and the EP - ROM of Fujitsu MBM 27 C
512 - 15 on it are mounted on the IC socket.
A shield Ni - MH rechargeable battery of 3.6 V 50 mAh is mounted on the upper board. It is for backing up
memory.
The aluminum box attached to the rear panel at the bottom right of the photo is the switching power supply.
Based on the lot number of IC used, this 3100D is probably made in 1991.
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The picture on the right is what I looked at from
the bottom. Click on the picture to view the
enlarged picture.
The large board is the analog section.
On the side visible from this picture, five
more daughter boards are mounted, and the
packing density is quite high.
Imposition parts are heavily used, and repair
at the time of breakdown (parts are too small) is
difficult.
Although there is a metal cover on the
bottom side of the board, there is a circuit of about -1,600 V in the inside part of this cover, it is dangerous to touch it
inadvertently. The "red colored mark" is displayed on the metal cover.
You can see a black cap on the left side of the metal cover, but here it is more dangerous as + 15,000 V is hanging.
There are quite a lot of adjustment volume and trimmer capacitor. It is designed to make all adjustments from the
side of this picture.
The picture on the right is what I looked at from
the right side.
There is no board etc. on this side.
The frame structure of the enclosure is well
understood. Although the strength of the
aluminum material is lower than that of the iron
plate, the frame structure is devised and the strength is raised.
Why it is basically based on aluminum material, it is to lighten it and not to influence (magnetism) to electron
beam irradiation of a cathode ray tube.
The picture on the right is what I looked at from
the left side. Click on the picture to view the
enlarged picture.
The board that can be seen from this side is a
vertical amplifier board. Y +, Y - vertical drivers are
also on this board.
Vertical amplifier board has many adjustment volume and trimmer capacitor.
A slightly thick gray coaxial cable that is visible on the right side near the CRT is the delay line.
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Repair
1. Repair
No waveform appears
Looking at the internal maintenance
seal, it seems that it has been repaired
twice, "November 6, 1998" and
"November 30, 2009".
I doubt it is here
I asked LEADER to repair
"November 30, 2009".
And 5 days later "December 5,
2009" Yahoo auction is exhibited as a junk
item.
Then, it is natural to think that LEADER has sent Yahoo auctions as being said to be unrepairable.
Anxiety saying that it may be difficult to repair · · · came across my head.
Junk is almost like this.
Those who do not have confidence in their arms will not let out their hands, but they are Ikemasen.
When checking the internal
connectors, the F cable of the P6 connector
of the photo was completely diagonally
entered
P6 is the smaller one of the white
connectors from which the F cable is
unplugged.
Lightly lift both sides of the white
connector to disengage the latch so that
you can connect and disconnect the cable.
When P6 connector is correctly
reinserted, the waveform will now come
out.
Since the failure of this time was poor contact of the connector part, it disassembled into pieces and
cleaned all the connectors with anhydrous alcohol. I think that it was fixed completely.
The [POSITION] knob of the CURSOR part was on the verge of grease
This was completely fixed by inserting high-viscosity grease for binoculars over the shaft over time.
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While inserting heat with a soldering iron, inserting grease goes well.
2. cleaning
The interior blew away the trash using a blower and brush.
The exterior wiped the dirt with multi cleaner D413 substitute for OA cleaner which
started using the whole recently. The front panel became beautiful.
The knobs were also cleaned with a multi-cleaner.
Setting menu
Since the 3100D uses a microcomputer, it has intelligence as well. As one
of them, there are menus that allow you to set display units and so on. To
display the main menu, press the [MENU] button.
Select the sub menu from the main menu and set the parameters.
Submenu depth varies.
The table below is the menu tree. Parameter defaults look like red
letters.
It is pleasing to be able to display dB and comment privately.
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MAIN MENU SUB MENU Setting parameters
STORAGE
EQU.SAMPLING OFF
ON
AVERAGING
OFF
2
4
8
16
32
64
128
256
SMOOTHING OFF
ON
INTERPOLATION
OFF
PLS
SIN
PLOTTER
FUL
1/4
2/4
3/4
4/4
VIEWTIME
OFF
1S
2S
5S
CURSOR/MEASURE
MEASURE MODE
CURSOR
GO/NO-GO
PARAMETER
MEASURE SELECT
CURSOR
CURSOR LINE
2 LINES
4 LINES
2 + 1(SUB) LINES
2 + 2(SUB) LINES
CURSOR UNIT
VOLT (⊿V)
V
%
dB
TIME (⊿T) s
%
FREQ (1/⊿T) Hz
°
PARAMETER
PEAK-PEAK
TOP-BASE
OVERSHOOT
UNDERSHOOT
RISE TIME
FALL TIME
PULSE WIDTH
PERIOD
FREQUENCY
TV LINE
AUTO
525
625
COMMENT
COMMENT1
DISPLAY OFF
ON
EDIT CHARACTER
Enter a character string (maximum 28
characters)
POSITION Set position of character string
COMMENT2
DISPLAY OFF
ON
EDIT CHARACTER Enter a string (up to 10 characters)
POSITION Set position of character string
COMMENT3
DISPLAY OFF
ON
EDIT CHARACTER Enter a string (up to 10 characters)
POSITION Set position of character string
GP-IB DELIMITER
CR/LF
LF
ADDRESS Set GP-IB address
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I tried it
1. Front panel
If you set the [STORAGE / REAL] switch to [STORAGE], you can use it as
DSO, and if you set it to [REAL] it can be used as an analog oscilloscope.
The operation when using it as an analog oscilloscope is easy. It will be
ready for DSO as well. The operation system is good.
There is no time unit of sweep time and input sensitivity display on the
rotary dial. Since the units of sensitivity and time axis are displayed together
with the waveform on the CRT screen, no display is required on the dial.
2. Rear panel
The power supply terminal is the same 3P type as the PC. Since the built-in power supply is a switching method,
the corresponding range of the input voltage is wide. It corresponds to AC 90 to 250 V / 48 to 440 Hz, and it can be
used around the world.
FUSE is 2A time lag type.
[EXT CLK INPUT] [GO / NO - GO OUTPUT (2)] [CH1 OUTPUT] [Z AXIS INPUT] There is a BNC terminal.
There is GP - IB connector.
If you connect a HPGL-compatible printer or plotter here, it seems that you can hard copy the observed
waveform.
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There are many freeware & shareware that simulate HPGL.
Hardware and drivers that use the parallel port of the personal computer as the GP - IB interface are also made
public on the net.
Therefore, if it is devised, it seems that it can capture hard copy to the personal computer.
3. AUTO RANGE function
This is funny! It is a stupid function. We will automatically switch the sensitivity and change the time axis so that
the observed waveform fits inside the Braun tube.
This function works when you press the [VOLTS / DIV] [TIME / DIV] knob to light up the [AUTO RANGE] lamp.
4. On-screen label function
It is a function to add an optional comment to the observation screen and display it. Alphanumeric characters can
be used for characters.
It is convenient when photographing and saving the observation screen.
5. Delay sweep function
You can expand the time axis using B sweep for the waveform captured by A sweep. The usage is below.
When you press the [A] button of [HORIZ DISPLAY], it becomes A sweep. In this state, display an arbitrary
waveform.
When you press the [ALT] button, the waveform displayed by A sweep and the waveform displayed by B sweep
are displayed on the cathode ray tube surface.
You can change the B sweep time with the [TIME / DIV] knob.
If (B sweep time) <(A sweep time), a part of A sweep waveform should be displayed somewhat bright. This part
is expanded in time axis with B sweep.
By turning the [POSITION] knob of the CURSOR section, you can move this bright part and see what part is
expanding the time axis.
The [POSITION] knob and the [TIME / DIV] knob can be used to change the magnified part and the enlargement
time arbitrarily.
By pressing the [B] button, only the enlarged waveform can be displayed.
The vertical position of the enlarged waveform can be moved with the [TRACE SEP] control.
6. DSO function
How to use DSO mode
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Set the [STRAGE / REAL] switch to the [STRAGE] side to enter the DSO mode. The result of "A / D conversion →
D / A conversion" of the input waveform on the cathode ray tube surface is displayed in realism.
To record a waveform, stop the waveform with the [HOLD] switch and press the [STORE] button to write it to
the internal memory.
To call up and display the stored waveform above, press the [RECALL] switch.
To hard copy the waveform captured by DSO to the GP - IB plotter, stop the waveform with the [HOLD] button
and press the [COPY] button.
How much can you use at a sampling rate of 40 MS / s?
Sampling the sine wave frequency ft with the sampling frequency fs will also generate alias frequencies of | ft -
fs | and | ft + fs |. This phenomenon always occurs in frequency multiplication and is also called "aliasing noise".
It is a funny story that I am planning to observe ft, actually I was watching ft-fs aliasing. This is a disadvantage of
DSO. fs want more than 100 times ft.
Therefore, if it is 40 MS / s, it is the observation limit up to 400 kHz. This level is sufficient for low frequency
observation but high frequency is impossible. It is not to overstage DSO.
The right picture is a DSO observation of a 10 MHz sine wave.
It does not seem like a very sine wave. Since the 10 MHz signal has a
sampling frequency of 40 MHz, the horizontal resolution that can express one
cycle is only 4 points.
Since the time for one horizontal point appears to be moro, I
measured this time with the lead - out cursor. Since it is 25.0 ns, it is 40 MHz
in terms of frequency conversion. I could prove that the sampling rate of 3100
D is 40 MS / s.
It is better to think about the 3100D DSO mode to about a low frequency omake.
7. Waveform observation example
When observing a signal of 10 MHz in real, it was displayed as
shown in the picture on the right.
[Input Channel] [Sensitivity] [Time / DIV] is displayed at the lower
left of the screen.
The X axis is A sweep 50 ns / div, and the Y axis shows that AC
coupling is carried out at 1 V / div.
Lead-out cursor
In 3100D, two pairs of lead-out cursors, X axis and Y axis, appear.
A total of 4 readout cursors can be moved to any position.
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In this example, the cycle and wave height value of one cycle of the waveform are measured using the lead-out
cursor. The measurement result is displayed on the upper right of the screen. The period is 100.0 ns and the crest
value is 4.25 Vp-p.
8. Comprehensive evaluation
It is sufficient performance for waveform observation of audio system mainly for FM receiver. Since the band is
100 MHz, it is enough for FM IF 10.7 MHz observation and it can be used for RF system observation.
The lead-out function is quite good. The merit is below.
Since the unit of measurement is displayed on the screen together with the waveform, there is no
misunderstanding of units.
(Since you do not need to read the dial scale, you can observe without leaving your eyes on the screen.
Skill is required to read the observed waveform from the scale on the X and Y axes, but if you use the lead out
cursor, the 3100D will calculate automatically, so anyone can easily and accurately read it.
In the analog oscilloscope, if you read the observed waveform from the scale on the X and Y axes, you will get
an error by all means. The same is true for the 3100D, but with the lead-out cursor it can be read without error (with
the accuracy of the crystal oscillator).
The 3100D has good operability and can be recommended.
Since the vertical sensitivity is 0.5 mV / div, considerable microwave waveforms can be observed.
The fully automatic function called AUTO RANGE is extremely appreciated. Even if you change the
measurement point of the probe, it automatically sets observation. You can focus on observation work.
Move the lead-out cursor The operability of the [POSITION] knob is good.
Even at the same rotation angle, when you turn it quickly, the cursor position change is large, and when you
rotate it slowly, the cursor position change becomes minute.
The demand to quickly and accurately to the target position is satisfied. The control program by the built-in
microcomputer is excellent.
From the Panasonic VP-5020A, the waveform is displayed in a sharp manner and operability is also good.
Waveforms and characters are sharper than VP-5020A. I think that a CRT is good.
The rank as an oscilloscope is different. I think that the price is far higher than VP-5020A.
It is estimated, but it seems that the 3100D had exceeded the list price of 500,000 yen.
Fans are constantly turning, but quiet for that. It is grateful to be quiet in personal use.
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9. Tricks
If you press the [VOLT] and [TIME] buttons of the [CURSOR] section at the same time and press both buttons as
well, the ⊿ T indication will be 1 / ⊿T and the frequency will be displayed.
If you press the [VOLT] and [TIME] buttons of the [CURSOR] section lightly and put both of them pressed up, the
lead-out cursor display at the top will disappear. The measurement unit display at the bottom remains displayed.
Cursor display may be troublesome depending on the observation situation, which is useful in this case.
specification
Even if you search on the net, 3100 D information will hardly hit.
· · · Accurate information of LEADER 3100D is being recruited · · ·
Information on LEADER 3100 A of 3100 D brothers was on the net.
The 3100D and 3100A are slightly different in appearance and color of the label, the others are exactly the same.
As a result of actually using 3100D, I felt that the specifications were similar.
Therefore, I posted the specification of 3100A almost as it was.
Mode Part Item Specification
Real
Vertical
Channel mode
CH1
CH2
ADD
ALT
CHOP
frequency band DC~100MHz -3dB
DC~20MHz -3dB (When bandwidth is limited)
Signal delay 20ns
Input sensitivity 0.5mV~5V/div
Input impedance 1MΩ, 27±3pF
Input coupling
AC
GND
DC
Maximum input voltage 400Vp
Level
Sweep mode
Triggered sweep
Automatic triggered sweep
Single sweep
Continuous delayed sweep
Alternate sweep
A sweep time 50 ns to 0.5 s / div (1 - 2 - 5 steps)
B sweep time 50 ns to 0.5 ms / div (1 - 2 - 5 steps)
Magnification 10 times (×10 MAG)
Trigger Trigger mode
ALT
CH1
CH2
LINE
EXT
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Trigger coupling
AC
HF-REJ
DC
TV-FLD1
TV-FLD2
TV-LINE
XY mode X:CH1
Y:CH2
DSO
Vertical
Vertical decomposition energy 8 bit (256 point), 25 point/div
sensitivity 0.5 mV to 5 V / div (1 - 2 - 5 steps)
Large sampling 40MS/s (Single Channel)
20MS/s (Dual Channel)
Level
Horizontal decomposition energy 11 bit (2048 point), 200 point/div
Sweep mode
Trigered sweep
Automatic triggered sweep
Single sweep
Continuously delayed sweep
Trigger delayed sweep
Roll mode
Roll trigger mode
A sweep time 50 ns to 50 s / div (1 - 2 - 5 steps)
B sweep time 50 ns to 0.5 ms / div (1 - 2 - 5 steps)
Magnification 1 to 100 times (1-2-5 steps)
Memory capacity Display, Reference memory
8bits × 2k word × 2ch
General
Lead-out function
Measurement unit display (dB, ΔV, ΔT, ΔV%, ΔT%, 1 /
ΔT)
Cursor measurement (voltage, time)
GO/No-GO function Waveform determination
Automatic measurement range switching
function Sensitivity & Cycle
GP-IB HPGL support
Power supply AC90~250V, 48~440Hz, 60W
size 310(W)×150(H)×400(D)mm
weight 7.4kg
Other Release date 1991
List price 480,000円