User`s guide

4 Operating the Power System
84 Series N6700 User’s Guide
To offset the beginning of the acquisition buffer relative to the
acquisition trigger, use:
Front Panel: SCPI Command:
Select Measure\Sweep.
Enter an offset value and press
Select.
To offset the measurement on
channel 1 by 100 points use:
SENS:SWE:OFFS:POIN 100,(@1)
When the value is 0, all values are taken after the trigger. Values
greater than 0 can be used to program a delay time from the receipt
of the trigger until the values entered into the buffer are valid. (Delay
time = offset x sample period). Negative values let you acquire
samples prior to the trigger.
NOTE
If, during a pre-trigger data acquisition, a trigger occurs before the pre-trigger
data count is completed, the measurement system ignores this trigger. Thi
s will
prevent the completion of the measurement if another trigger is not generated.
Select the Measurement Trigger Source
NOTE
An immediate trigger command over the bus will generate an immediate trigger
regardless of the trigger source.
Unless you are using a TRIGger:ACQuire command to trigger the
measurement, select a trigger source from the following:
Bus
Selects GPIB device trigger, *TRG, or <GET> (Group Execute Trigger).
External
Selects any pin configured as a trigger input as the trigger source.
Pin<n> Selects a pin on the external port connector as the trigger source.
<n> specifies the pin number. The selected pin must be configured as a Trigger
Input in order to be used as a trigger source (see Appendix B).
Transient<n> Selects the output channel’s transient system as the trigger source.
<n> specifies the channel.
When you select a channel, you must also set up
that channel’s transient system to generate a trigger out signal. See “Generate
Trigger Out Signals” and “Program an Arbitrary List” earlier in this chapter.
Use the following commands to select a trigger source:
Front Panel: SCPI Command:
Not Available To select Bus triggers for output 1:
TRIG:ACQ:SOUR BUS,(@1)
To select a Digital pin as the trigger:
TRIG:ACQ:SOUR PIN<n>,(@1)
To select a Transient output as trigger:
TRIG:ACQ:SOUR TRAN<n>,(@1)
where n is the output channel that will
generate the trigger signal.