User`s guide

7 - Programming the DC Source

The INITiate commands move the trigger system from the idle state to the initiated state. This enables

the dc source to receive triggers. To initiate for a measurement trigger, use:

INITiate:SEQuence2 or

INITiate:NAME ACQuire

After a trigger is received and the data acquisition completes, the trigger system will return to the idle

state (unless multiple measurements are desired). Thus it will be necessary to initiate the system each

time a triggered acquisition is desired.

NOTE: You cannot initiate measurement triggers continuously. Otherwise, the measurement data

in the data buffer would continuously be overwritten by each triggered measurement.

Selecting the Measurement Trigger Source

The trigger system is waiting for a trigger signal in the initiated state. Before you generate a trigger, you

must select a trigger source. The following measurement trigger sources can be selected:

BUS -

selects GPIB bus triggers.

INTernal -

selects the dc source's output as the measurement trigger.

To select GPIB bus triggers (group execute trigger, device trigger, or *TRG command), use:

TRIGger:SEQuence2:SOURce BUS or

TRIGger:ACQuire:SOURce BUS

To select internal triggers (measurements triggered off the output signal) use:

TRIGger:SEQuence2:SOURce INTernal or

TRIGger:ACQuire:SOURce INTernal

Generating Measurement Triggers

There is only one measurement converter in the dc source. Before you generate a measurement trigger,

you must specify a measurement acquisition of either voltage or current. To specify a measurement

acquisition use:

SENSe:FUNCtion "CURRent" or

SENSe:FUNCtion "VOLTage"

Single Triggers

After you specify the appropriate trigger source and measurement acquisition, you can generate triggers

as follows:

GPIB Triggers

Send one of the following commands over the GPIB :

TRIGger:IMMediate (not affected by the trigger source setting)

*TRG

a group execute trigger

Internal Triggers

To trigger off of the output signal, you must specify the output level that

generates the trigger, the rising or falling edge of the slope, and a hysteresis to

qualify trigger conditions. This is illustrated in figure 7-5.