Todd Moore for the DES CollaborationNov 28, 20061 Noise test hardware & software setup. Earth...

Todd Moore for the DES Collaboration Nov 28, 2006 1

• Noise test hardware & software setup.• Earth grounding scheme utilized for noise tests.• Block diagram of earth & signal grounds.• UofI Monsoon test stand wiring scheme.• Test results with linear supplies.• Test results with Vicor supplies.• Conclusion…

Vicor Noise Test Results Ver. 7.0


Noise Test Hardware Setup

• All test are run with either Linear supplies or Vicor supplies attached to original Monsoon 6-slot DHE.

• Remote sensing was removed & local sensing added.• Noise measurements are taken with video inputs: shorted,

floating, & connected to ccd emulator thru video cable supplied by Fermilab.

• The Vicor +3.3vdc voltage is running without uRAM.


Noise Test Software Setup

• All exposures are long.Monsoon is running Fermilab focalplane on cyclone:/home/monsoon/cfg/_fnal/.

• Sequencer for 6-slot readout is ReadType1d.ucd.• All exposures are long.• # of pixels for long exposure is 4146 (4096+50) rows X 2248

(2048+100) columns.• Readout time is at 11uS/pixel.• All Offsets are set to 1.0v. • Channel 0 & 2 video inputs are used for readout.• All datasets are located on

cyclone.hep.uiuc.edu:/home/monsoon/data/vicor_noisetest/….• Data is analyzed for a long run using ./noiselast_wrows.sh.• Data is analyzed visually using DS9 or FV4.2.


NOTES:

• CCD TEST RACK CONNECTS TO EARTH GROUND THRU POWER STRIP GOING TO OUTLET & PROVIDES ONE POINT FOR EARTH GROUND REFERENCE.

• ON LINEAR SUPPLIES, ALL ANALOG & DIGITAL RETURNS ARE TIED TOGETHER AT THE SUPPLY & AT THE MONSOON BACKPLANE.

• ON VICOR SUPPLIES, ANALOG RETURNS ARE TIED TOGETHER AT THE SUPPLY; DIGITAL RETURNS ARE TIED TOGHETHER AT THE SUPPLY, AND BOTH ANALOG & DIGIAL RETURNS ARE TIED TOGETHER AT THE MONSOON BACKPLANE.

• THE ANALOG & DIGITAL RETURNS ARE CONNECTED FROM THE MONSOON BACKPLANE TO THE TEST RACK TO TIE EARTH GROUNDS AND SIGNAL GROUNDS TOGETHER.

• THE +/-15VA, +/-5VA, +5VD, & +3.3VD LINEAR SUPPLY CASE IS @ EARTH GROUND, WHILE VOLTAGE OUPUTS ARE ISOLATED.

• THE -28VA SUPPLY CASE & VOLTAGE OUTPUTS ARE ISOLATED. ISOLATED EARTH GROUND BANANNA PLUG FROM SUPPLY IS CONNECTED TO TEST RACK TO TIE -28V SUPPLY EARTH GROUND INTO SYSTEM.

• VICOR POWER SUPPLY CASE IS @ EARTH GROUND WHILE VOLTAGE OUTPUTS ARE ISOLATED.

• GROUNDING STRAP CONNECTS VICOR CASE TO RACK TO BRING SIGNAL & EARTH GROUNDS TOGETHER.

UofI Earth Grounding Scheme


Block Diagram Of Grounding Scheme

NOTES: RACK IS THE SINGLE POINT FOR EARTH GNDS

1. Rack is single point for all Earth Grounds, all AC Power (+ Egnd) comes from single power strip mounted on rack.

2. Vicor Case, which is fed Egnd from A/C plug, is attached to Rack with grounding strap.

3. Linear Case is mounted to Rack & thus is @ Earth Ground.

4. Monsoon Case & backplane gnds are attached to rack, which is @ Egnd.

Linear Supply-28VA

Fan Panels

Vicor supply (Case @ Earth GND)

Monsoon Case(@EGND)

Monsoon Backplane

Metal Rack

AGND & DGNDPlanes

Digital & Analog Voltage Returns

Digital & Analog Voltage Returns

EGND

EGND

EGND

EGND

EGND

EGND

UofI CCD Test Stand Grounding Scheme

Linear Supply: +/-15VA, +/-5VA,+5VD, & +3.3VD

Note 1:

Note 3:

Note 3:

Note 4:

Note 2:


UofI Monsoon Test StandWiring Scheme


Linear Supply Test Results

Channel 0 Channel 2

Test Date Conditions Mean RMS Mean RMS Notes/Results FITS PS

Test3

7-Nov-06

Linear supplies are attached to the original Monsoon DHE and

unloaded. -28van & +48van are not connected. Video input is shorted

at trans board. Egnd and backplane gnds are NOT connected together at the

backplane.

80,720 3.96 83,070 6.58

Get a baseline measurement with original test stand

attached to linear supply. Earth grounds haven’t been

connected to signal grounds. This is the same test setup as

in previous versions. Osc. Occurred every 80 counts or every 880us, or @ 1.13kHz

nTestNov7_tst3.fits

nTestNov7_tst3.ps

Test4

7-Nov-06Same as test3, above, except Egnd

& return gnds are connected together at the backplane.

80,710 3.92 83,040 5.30

Connecting Egnds to signal returns @ backplane didn’t

increase the sigma. Osc. Occurred every 80 counts or every 880us, or @ 1.13kHz

nTestNov7_tst4.fits

nTestNov7_tst4.ps

Test5

7-Nov-06Same as test4, above, except -

28van IS connected. +48van is not connected.

80,690 4.14 83,000 4.11

Connecting -28van, w/ Egnd attached, didn’t increase the sigma. Osc. Decreased but is

still present.

nTestNov7_tst5.fits

nTestNov7_tst5.ps

Test6

7-Nov-06

Fermilab video cable (w/ ccd emulator), and Bias is attached to

ccd acq. Trans. Board. Clk is attached to the cbb trans board. The shield on the video cable is

NOT conneted to Egnd. -28van IS connected. +48van is NOT

connected.

80,860 26.23 83,190 24.99Connecting video cable w/

ccd emulator caused sigma to raise.

nTestNov7_tst6.fits

nTestNov7_tst6.ps

Test7

7-Nov-06Same as test7, above, except video cable shield IS connected to Egnd. 80,870 19.44 83,160 21.11

Connecting video cable shield to Egnd didn’t caused sigma

to raise. But there is a double peak in the noise curve.

nTestNov7_tst7.fits

nTestNov7_tst7.ps


Linear Supply Plot Results

Test 3, Nov 7, 2006


Test 4, Nov 7, 2006



Test 5, Nov 7, 2006



Test 6, Nov 7, 2006



Test 7, Nov 7, 2006



Vicor Supply Test Results

Channel 0 Channel 2

Test Date Conditions Mean RMS Mean RMS Notes/Results FITS PS

Test13

21-Nov-

06

Vicor supplies are attached to the original Monsoon DHE and unloaded. Egnds & return gnds are connected together at the backplane. Fermilab video cable (w/ ccd emulator), and Bias is attached to ccd acq. Trans.

Board. Clk is attached to the cbb trans board. The shield on the video cable

IS conneted to Egnd. -28van IS connected. +48van is NOT connected.

80,920 28.64 83,25 24.80

Get a baseline measurement with original test stand attached to Vicor

supply, including -28van. All Egnds are tied to rack.

Egnds have been connected to signal

grounds @ backplane.

nTestNov21_tst13.fits

nTestNov21_tst13.ps

Test14

21-Nov-

06

Same as test13, above, except -28van is NOT connected. +48van is not

connected80,960 28.37 83,290 24.00

No change in sigma when -28van is

removed.


nTestNov21_tst14.ps

Test15

21-Nov-

06

Same as test13, above, except video inputs are floating (vid connector

removed from ccd acq trans). Clk & Bias are still attached. -28van still

attached.

80,760 11.98 83,090 11.20

Take measurement with video inputs

floating. Removing video cable from

video inputs caused sigma to drop by

half.


nTestNov21_tst15.ps


Test 13, Nov 21, 2006

Vicor Supply Plot Results


Test 14, Nov 21, 2006



Test 15, Nov 21, 2006



Conclusion…

• Baseline measurements for linear & Vicor supplies are in-line with previous measurements. IE. Monsoon system is functioning normally.

• Adding FNAL video cable + ccd emulator caused the sigma to go up to ~25 counts RMS for both linear & Vicor supply. IE. No real difference between linear or VIcor supplies attached to Monsoon system.

• I don’t see the same large numbers of sigma as seen at FNAL.• Ground scheme may be different than FNAL…May need to re-run

some tests with different grounding scheme.

Todd Moore for the DES CollaborationNov 28, 20061 Noise test hardware & software setup. Earth...

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