Specifications

User Manual 301/302
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 and 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 µs to 999 ms. The default period is 1 ms. The internal trigger
generator is ignored when either an external source is enabled.
The query:
TRIGger:TIMer?
Queries the period of the internal trigger generator and returns a value
in seconds.
To perform this in WaveWiz, Enter the value in the data entry box
marked Timer (s). (See Figure 3.12 above)
Selecting the Trigger
Slope
The trigger slope command toggles edge sensitivity for the trigger
input connector. The Model 301/302 can be made sensitive to either
positive or negative transitions. Use the following command to select
the slope for the trigger signal:
TRIGger:SLOPe {POSitive | NEGative}
Positive going transitions will trigger the Model 301/302 when the POS
option is selected. Negative transitions will trigger the Model 301/302
when the NEG option is selected. POS is the default slope. In Gated
mode, a high level will gate the generator when the POS option is
selected; a low level will when NEG is selected.
The query:
TRIGger:SLOPe?
queries the trigger slope and returns POS or NEG.
In WaveWiz, click on the relevant diamond shaped button in slope on
the trigger tab (see figure 3.12 above).
Configuring the Instrument
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