Selecting The Trigger Source - Racal Instruments 3151 User Manual

3151 And 3151A User Manual
Selecting the
Trigger Source
TRIGger:COUNt <counts>
INIT:CONT OFF places the Model 3151/3151A in a non-continuous
mode. TRIG:BURS ON turns the burst function on. The TRIG:COUN
specifies the number of waveforms output after a qualified trigger
signal. To ensure proper operation, enable Burst mode after setting
up the burst parameters. When Burst mode is enabled, previously
programmed Trigger or Gate modes turn off automatically.
The query:
TRIGger:BURSt?
queries the state off Burst mode and returns "0" (OFF) or "1" (ON).
The query:
TRIGger:COUNt?
queries the burst count and returns an integer.
When an external source is not available, the operator has the option
to use either the built-in trigger generator or a TTLTRG<n> signal to
stimulate its output. Use the following command to select the trigger
source for the instrument:
TRIGger:SOURce:ADVance {EXTernal | INTernal | TTLTrg<n>}
EXT is the default trigger source for the Model 3151/3151A. Select
the TTLT<n> option with <n> ranging from 0 to 7 to use one of
the TTLTRG lines
available on the backplane. Select INT to use the internal trigger
generator. Remember to program the period of this generator (as
shown later).
The query:
TRIGger:SOURce:ADVance?
queries the trigger source and returns EXT, INT or TTLT<n>.
Using The Instrument 3-21