UG crate status

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UG crate status

• TIM CERN 28/10/08
• A.Bartoloni, B.Borgia, F.R.Spada
• INFN Rome

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UG electronics in the TRD gas system
5.6V 12.5V 29V
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UG crate QM qualification and FM acceptance tests
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UG crate QM qualification and FM acceptance
testsSetup
TV / EMC CHAMBER
UG CRATE
GAS SYSTEM SIMULATOR
SLOW CONTROL
TEST STATION
5.6V 12.5V 29V
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UG crate in the thermal vaccum chamber signal
and power cables have a length of 3 m
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UG crate FM acceptance testsTV chamber setup
TV CHAMBER
UG CRATE
GAS SYSTEM SIMULATOR
SLOW CONTROL
5.6V 12.5V 29V
TEST STATION
UGPD power supply
28 V A
28 V B
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UG crate and UGPD power cables 1 m
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UG crate QM qualificationProblems

• 1) QM2 EMC test (UG crate UGPD)
• CE03 at 15 kHz exceeded limit by 3dbInserted
  a 450 µF capacitor on 29 V power taps at the
  backplane Solved
• 2) QM2 EMC test (UG crate UGPD)
• RS03 at 60 V/m, 240 MHZ lost LeCroy
  communication between UGSCM and UGPD Removed the
  0-Ohm resistor inside the S9011AUGv2 at
  UGPDShielded all cables between UG and
  UGPD Solved

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EMC test additional capacitor
For the UG-FM, GA followed the method adopted at
CSIST for the TBS board to assemble the
additional capacitors on the 29V line.
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UG crate FM acceptance testsProblems

• 3) FM TVT test (UG crate UGPD)
• at -20 lost of LeCroy communication between
  UGSCM and UG boards
• rate of 20
• not observed at 50 C in TVT
• not observed at ESS test at -20 C without UGPD
• observed either with UG-FM or with UG-QM2
  electronics

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Findings and corrections

• LeCroy errors depends crucially from the actual
  5.6V power supply value. Commercial power
  supplies feed power to UG through 3m cables
• ? Nominal 5.6V at power supply source drops to
  5.4V at UG backplane.
• Raising external power supply to 5.8V, such that
  at the backplane the voltage is 5.6V, failure
  behaviour is reproduced and is totally consistent
  with UGPD supplying power to UG.
• Observations and measurements of bus lines,
  routing LeCroy commands, showed instability of
  the receivers outputs when any card is not
  driving the bus.
• Such buses are implemented using LVDS technology
  and bus signals are routed from one card to
  another by controlled impedance strip lines
  etched on the backplane card (UGBP). LeCroyBus
  data lines pull down resistors, soldered on the
  backplane, produce a bias voltage value at the
  input of LVDS receivers (SN65LVDS390PW) that
  exceed specifications.
• We changed the pull down resistors on UG-QM2
  backplane, the correct bias is restored. We did
  not observed any error at any condition and
  temperature.

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LB LVDS data lines before changes
LB LVDS data lines after changes
_at_VCC 5.4V VIC((Vdata)(Vdata-))/2 2.7 V.
_at_5.4V VIC 1.9 V.
_at_5V VIC 2.5 V.
_at_5V VIC 1.8 V.
SN65LVDS390
SN65LVDS390
VCC
VCC
R
R
2K5 O
3K3 O
LVDS_Data-
LVDS_Data-
R
R
100 O/2
100 O/2
LVDS_Data
LVDS_Data
R
R
2K5 O
1K8 O
MAX VIC 2.5 V
GND
GND
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UG FS electronics

• To confirm and verify diagnostics and solution,
  we asked to modify, at CERN, the UG-FS
  electronics and we took the opportunity to
  perform ESS test and TVT test at Terni, in
  coincidence with Tracker spare electronics TCS.
• Modified UG-FS electronics arrived in Rome August
  18th.
• ESS test and TVT test started at SERMS, Terni, on
  August 20th and ended on September 20th.
• ESS test UG-FS commercial power supplies
• TVT test UG-FS UGPD

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UG-FS layout for Terni test
FS
FS
FS
QM2
FS
QM2
B
A
A hot
B cold
A hot
B cold
A hot
B cold
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ESS test post vibration UG commercial PS5.6V
on backplane
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TVT UG UGPD
10K commands side A10K commands side B
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LeCroy commands tests

• The different types of tested commands are
• 142 command types to all 3 modules UGBS,
  UGBC, UGFV, with UGSCM/A and UGSCM/B
• To check consistency of test output, we sent
  100 commands to empty slots or to modules without
  power. Failures were
• 100/100
• In addition to specific test of LeCroy commands,
  we performed standard functionality test on all
  modules. Testing all functions with LeCroy
  commands, we did not observed any single failure.

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Le Croy Commands Specific Tests Summary
functionality tests
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UG-UGPD bus
UGPD
UG
LeCroy bus cable length 80 cm x
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What next

• Change UG-UGPD bus cable on UG-FS and UG-FM
• Modify bias resistors on UG-FM backplane
• Functionality test on UG-FM and UG-FS
• 1 and 1/2 weeks after receiving cable parts
• ESS test on UG-FM 1 week
• ESS test on UG-FS 1 week