Selecting A Trigger Delay; Arming And Disarming The 1256 - Racal Instruments 1256 Manual

Publication No. 980855 Rev. A
Selecting a Trigger
Delay
Arming and
Disarming the 1256
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The 1256 may be programmed to delay before acting on a trigger.
This provides the ability to slow down the scan list operation if so
desired. The TRIGGER:DELAY command is used to program the
trigger delay. The syntax for this command is:
:TRIGger
[:SEQuence]
:DELay <trigger delay>
The <trigger delay> is a real number between 0.0 and 10.0. The
trigger delay is programmed in seconds, with a resolution of 1
microsecond. This is the resolution and not the accuracy. That
means that you will receive 0.00000 (5 decimal places) when you
read it. Any delay over 10 milliseconds rounds the delay to the
nearest 10 milliseconds.
When a non-zero trigger delay is programmed, the 1256 performs
an "idle wait" for the trigger delay period before acting on the
trigger.
The present trigger delay may be queried by using the
TRIGGER:DELAY? command.
Before scanning of channels can be performed, the 1256 must be
armed. Arming is accomplished with the INITIATE command. The
syntax for the INITIATE command is:
:INITiate
:IMMediate {ON|1|OFF|0}
:CONTinuous {ON|1|OFF|0}
The INITIATE:IMMEDIATE command arms the 1256. This enables
the 1256 to accept new triggers and continue scanning. Each time
the INIT:IMMEDIATE command is received by the 1256, it enables
triggering for the scan list. Each time this command is received, the
number of elements which may be scanned is set to the trigger
count.
Each time the INIT:IMMEDIATE command is received, scanning
resumes from the point at which it was stopped, NOT from the
beginning of the scan list. That is, if the commands:
SCAN (@1(0:19))
TRIG:COUNT 3
TRIG:SOUR BUS
INIT:IMMEDIATE
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