7 - Programming the DC Source

Pre-trigger and Post-trigger Data Acquisition

The measurement system lets you capture data before, after, or at the trigger signal. When a measurement is initiated, the dc source continuously samples the instantaneous signal level of the sensing function. As shown in figure 7-7, you can move the block of data being read into the acquisition buffer with reference to the acquisition trigger. This permits pre-trigger or post-trigger data sampling.

OFFSET = -4096

 

4096 DATA POINTS

 

OFFSET = -2048

 

4096 DATA POINTS

 

OFFSET = 0

 

4096 DATA POINTS

 

OFFSET = 0 to 2 9

4096 DATA POINTS

TIME

 

ACQUISITION

 

TRIGGER

 

Figure 7-7. Pre-trigger and Post-trigger Acquisition

To offset the beginning of the acquisition buffer relative to the acquisition trigger, use:

SENS:SWE:OFFS:POIN <offset>

The range for the offset is -4096 to 2,000,000,000 points. As shown in the figure, when the offset is negative, the values at the beginning of the data record represent samples taken prior to the trigger. When the value is 0, all of the values are taken after the trigger. Values greater than zero can be used to program a delay time from the receipt of the trigger until the data points that are entered into the buffer are valid. (Delay time = offset x sample period).

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. This will prevent the completion of the measurement if another trigger is not generated.

Programming the Status Registers

Status register programming lets you determine the operating condition of the dc source at any time. For example, you may program the dc source to generate an interrupt (SRQ) when an event such as a current limit occurs. When the interrupt occurs, your program can act on the event in the appropriate fashion.

Figure 7-8 shows the status register structure of the dc source. Table 7-1 defines the status bits. The Standard Event, Status Byte, and Service Request Enable registers and the Output Queue perform standard GPIB functions as defined in the IEEE 488.2 Standard Digital Interface for Programmable Instrumentation. The Operation Status and Questionable Status registers implement functions that are specific to the dc source.

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Agilent Technologies 66311B, 66309B Programming the Status Registers, Pre-trigger and Post-trigger Data Acquisition
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66111A, 66309B, 66311B, D specifications

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