73A–308
Page 68
60. Measure the voltage at P5 pin-49. The voltage will be less than +500 mV.
61. Send “R;E;D
lf
” (Reset, enable and then disable all outputs) to the 73A-308.
Triggering
This tests the TTLTRG lines on the VXI backplane.
Steps 2 through 8 verify that the output will not go active until a trigger is received on the
selected TTLTRG line. The test uses Relay Output 72 and a 300 mA current supplied by
a +5V power supply.
Step 3 programs the Trigger Setup to use TTLTRG 0 as the input trigger line that acti-
vates Relay Driver 72. The command also sets TTLTRG 0 as the output line. This line
will output a trigger pulse on the Trigger command (step 6). Since TTLTRG line 0 is used
as both the input and output, the output trigger pulse will be the trigger input pulse that
activates Relay Driver 72.
Steps 3 and 4 ensure that the driver is not active until the trigger command is received in
step 6.
Steps 8 through 14 test that only the selected TTLTRG input line will cause the output to
go active. Step 9 programs the Trigger Setup to use TTLTRG 0 as the input trigger line
that activates Relay Driver 72 and TTLTRG 1 as the output line.
Steps 2 through 14 test TTLTRG line 0 for input.
1. C5 V power supply to P5 pin-17. Connect a 15
, 3 W resistor from +5V to
P5 pin-49, Relay Driver 72. Monitor pin-49 with a DMM. The voltage at pin-49 will
be the same as the +5 V.
2. Send “R;E;D
lf
” (Reset, Enable and then Disable) to the 73A-308.
3. Send “TS 0,0
lf
” ( Trigger Setup, TTLTRG0 IN, TTLTRG0 OUT) to the 73A-308.
4. Send “C72;E
lf
” (Close Relay Driver 72, Enable outputs) to the 73A-308.
5. The voltage at pin-49 will remain at +5 V.
6. Send “T
lf
” (Trigger) to the 73A-308.
7. The voltage at pin-49 will be below 500 mV.
8. Send “R;E;D
lf
” (Reset, Enable and then Disable) to the 73A-308.
9. Send “TS 0,1
lf
” ( Trigger Setup, TTLTRG0 IN, TTLTRG1 OUT) to the 73A-308.
10. Send “C72;E
lf
” (Close Relay Driver 72, Enable outputs) to the 73A-308.
11. The voltage at pin-49 will remain at +5 V.
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