Programming the DC Source - 7

One way to wait for results without tying up the computer is to use the SCPI command completion commands. For example, you can send the *OPC command after INITialize, then occasionally poll the OPC status bit in the standard event status register for status completion while doing other tasks. You can also set up an SRQ condition on the OPC status bit going true and do other tasks until the SRQ interrupts.

Multiple Triggers

As shown in Figure 7-6, the dc source also has the ability to set up several measurements in succession. This is accomplished by specifying a trigger count.

NOTE: Multiple triggers can only be programmed for voltage and current measurements on the main output (output 1). Multiple triggers cannot be programmed for DVM measurements.

trigger 1

trigger 2

trigger 3

trigger level

 

 

Measurement

Measurement

Measurement

(Measurement = time interval X # of points)

 

 

 

TRIG:ACQ:COUN:VOLT 3

or

 

TRIG:ACQ:COUN:CURR 3

 

Figure 7-6. Multiple Measurements

To set up the trigger system for a number of sequential acquisitions use:

TRIG:ACQ:COUN:CURR <number> or

TRIG:ACQ:COUN:VOLT <number>

With this setup, the instrument performs each acquisition sequentially, storing the digitized readings in the internal measurement buffer. It is only necessary to initialize the measurement once at the start; after each completed acquisition the instrument will wait for the next valid trigger condition to start another. When all measurements complete, use FETCh commands to return the data.

By varying the measurement parameters, you can accurately measure specific portions of an output pulse. For example, if you set the measurement time to match the pulse width, you can measure just the high level of a specific number of output pulses. If you increase the measurement time to include the entire waveform, you will return measurement data based on the entire waveform. To calculate the correct time interval for your measurement, simply divide the desired measurement time by the number of points or samples in the measurement.

NOTE: The total number of data points cannot exceed 4096. This means that the count multiplied by the points in each measurement cannot exceed 4096; otherwise an error will occur.

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Agilent Technologies 66111A, D, 66311B, 66309B manual Trigacqcouncurr number or Trigacqcounvolt number

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