1261B User Manual
Using The Enhanced Monitoring System 4-28
Racal Instruments
Ó
1995
Testing the DFI
Operation
A piezo electric alarm can be connected in the following manner.
Connect J413-2 to the minus terminal of the alarm. (TRIG OUT).
Connect J414-1 to the plus terminal of the alarm (+5VDC).
Use the VIC program to send the command:
VXI:CONF:MONITOR:TRIG:OUTPUT DFI
Run 1261B EMS Soft Front Panel
Go the Voltage Set Limit screen
Set the +5VDC limit to “5.00”
The DFI TRIG OUT will Switch to low turning on the Alarm.
Change the +5VDC limit back to the default value of “5.25”.
Programming a
Trigger Delay Time
A delay time may be added between:
1) The TRIG IN input and the selected TTLTRGx line, OR
2) The TTLTRGx line and the TRIG OUT output, OR
3) The TRIG IN input and the TRIG OUT output
The trigger delay time ranges from 0.0 to 1.04857596875
seconds in steps of 31.25 nanoseconds. To program a delay
time, the command:
VXI:CONF:MONITOR:TRIG:DELAY
<delay time>
where “<delay time>” ranges between 0.0 and 1.04857596875.
NOTE
When the trigger delay is non-zero, the trigger pulse
is generated from the 1261B EMS. It is not identical
to the trigger signal applied to the input (or from the
TTLTRGx line). The trigger pulse is approximately
100 nanoseconds wide and is a low-going (normally
high) pulse.
NOTE
The EMS trigger delay circuit adds a delay between
the input and output pulses. This delay is between
31.25 ns and 62.5 ns (typical, 100 ns maximum).
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