CMS ME CSC HV system
Instructions for initial electrical test of SMT-assembled Distribution
and Master boards in UF
Alex Madorsky, madorsky@phys.ufl.edu
Oscilloscope settings:
Vertical scale:
Channel 1 – 1V/division
Channel 2 – 200 mV/division (the probe on this channel divides the signal by 10,
so actually the scale becomes 2V/division)
Horizontal scale:
500 microseconds/division
Distribution boards:
1. Solder power jumpers to the following components:
a. F2 and C37, to the terminals close to the edge of the board
b. F1 and C38, to the terminals close to the edge of the board
2. Check power voltage and current limits on the power supply:
a. +5V, 0.5A
b. –5V, 0.5A
3. Set the board number on SW2 (see instruction below)
4. Set SW1 to 0, using flat screwdriver
5. Press ON/OFF button on the power supply
6. Check output voltage and current of power supply:
a. +5V channel must show voltage between +4.9 V and +5.1V
b. +5V channel must show current between 0.15 A and 0.35 A
c. –5V channel must show voltage between –4.9 V and –5.1V
d. –5V channel must show current between 0.08A and 0.25A
e. If one of the voltages or currents is out of limits – stop the test, record
error.
7. Start the test program: D:\PUB\BIN\HVCTRL\HVCTRL.EXE
8. Set the following parameters in the program:
a. Board address: 0
b. Board ID: equal to board number set in step 3
9. Press “Read board ID” button
10. Check that Field “Read ID” shows the number equal to Board ID. If they don’t
match – stop the test, record error.
11. Set “DAC value” field in the program equal to 500
12. Press “Set all channels” button
13. Connect oscilloscope channel 1 probe:
a. Ground contact (alligator clip) to TP21
b. Signal contact to TP22 (SYNC)
14. Check the signal on channel 1. It should be positive pulse, ~1.5 ms length, about 3
to 5 volts amplitude. If it is not so, stop the test, record error.
15. With channel 2 probe, check the signals on U1 – U10, pin 1. On all of these pins,
the signals must be present, and be 4 to 5 V in amplitude. If on one of the pins the
signal is absent, or the amplitude is wrong, stop the test, record error.
16. Check signals on U11, U12 pins 6 and 7. Signal on pin 6 must be the mirrored
image of signal on pin 7, for each of these chips. Amplitude of the signals must be
from 3 to 5 V. Shape of these signals is similar to comb. If the signal on one of
the pins is absent, or has smaller amplitude, or has wrong shape – stop the test,
record error.
17. Check signal on U37, pin 6. The pulse must be negative, about 0.5 V in
amplitude. Duration of the pulse must be about 1.2 ms in length. If it is not so,
stop the test, record error.
18. In program, set “DAC value” field to 4000
19. Press “Set all channels”
20. Check signal on U37, pin 6. The pulse must be negative, about 4V in amplitude.
Duration of the pulse must be about 1.2 ms in length. If it is not so, stop the test,
record error.
21. Test is finished without errors. Make a record in the log.
Master boards:
1. Check power voltage and current limits on the power supply:
a. +12V, 0.5A
b. –5V, 0.5A
2. Set the board number on SW3 (see instruction below)
3. Set SW2 to F, using flat screwdriver
4. Press ON/OFF button on the power supply
5. Check output voltage and current of power supply:
a. +12V channel must show voltage between +11.9 V and +12.1V
b. +12V channel must show current between 0.1 A and 0.2 A
c. If one of the voltages or currents is out of limits – stop the test, record
error.
6. Start the test program: D:\PUB\BIN\TEST12.EXE
7. Check that Field “->??” shows the number equal to board number set on SW3. If
they don’t match – stop the test, record error.
8. Press “Point 1” button. Wait until the sliders in the program stop.
9. Connect oscilloscope channel 1 probe:
a. Ground contact (alligator clip) to TP14
b. Signal contact to U2, pin 6 (SYNC)
10. Check the signal on channel 1. It should be positive pulse, ~1.5 ms length, about 3
to 5 volts amplitude. If it is not so, stop the test, record error.
11. With channel 2 probe, check the signals on U3,7,10,11,12,13,16,17,19,22, pin 1.
On all of these pins, the signals must be present, and be 3 to 5 V in amplitude. If
on one of the pins the signal is absent, or the amplitude is wrong, stop the test,
record error.
12. Check signals on U25, U28 pins 6 and 7. Signal on pin 6 must be the mirrored
image of signal on pin 7, for each of these chips. Amplitude of the signals must be
from 3 to 5 V. If the signal on one of the pins is absent, or has smaller amplitude –
stop the test, record error.
13. Check signal on U31, pin 6. The pulses must be negative, about 2 V in amplitude,
shaped like a comb. Duration of the pulses must be the same as duration of the
SYNC signal on channel 1. If it is not so, stop the test, record error.
14. Press “Point 2” button in the program. Wait until the sliders in the program stop.
15. Check signal on U31, pin 6. The pulses must be negative, about 0.4 V in
amplitude. Duration of the pulses must be the same as duration of the SYNC
signal on channel 1. If it is not so, stop the test, record error.
16. Test is finished without errors. Make a record in the log.
Binary code:
9
256
8
128
7
64
6
32
5
16
4
8
3
4
2
2
1
1