Racal Instruments 3162A/B, Руководство пользователя, Страница: 57 / 144

User Manual 3162A/B
Using The Instrument 3-23
TRIGger:BURSt?
queries the state of Burst mode and returns "0" (OFF) or "1" (ON).
The query:
TRIGger:COUNt?
queries the burst count and returns an integer.
Selecting the Trigger
Source
When an external source is not available, the operator has the option of using
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 3162B. Select the TTLT<n>
option with <n> ranging from 0 to 3 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 the internal generator as discussed in the
section, “Using the Internal Trigger Generator”.
The query:
TRIGger:SOURce:ADVance?
queries the trigger source and returns EXT, INT or TTLT<n>.
Using the Internal
Trigger Generator
The internal trigger generator is a free-running generator which is asynchronous
with the main output generator. When the internal trigger source is selected,
the front panel TRIG IN signal is inactive. The internal trigger generator is also
usable in Burst mode, but has no effect in Gated mode. To use the internal
trigger generator, place the instrument in triggered mode, but select the internal
trigger generator as the trigger source. Then use the following command to
program an internal trigger period:
TRIGger:TIMer <value>
The period of the internal trigger generator can be programmed from 20
µ
s to
1000 s. The default period is 100
µ
s. The internal trigger generator is ignored
when either an external or TTLT source is enabled.
The query:
TRIGger:TIMer?
queries the period of the internal trigger generator and returns a value in
seconds.