Programming The Status Registers; Power-On Conditions - Agilent Technologies 66311A User Manual

Programming the DC Source - 7
buffer with reference to the acquisition trigger. This permits pre-event or post-event data sampling.
OFFSET = -4096
4096 DATA POINTS
OFFSET = -2048
4096 DATA POINTS
OFFSET = 0
4096 DATA POINTS
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OFFSET = 0 to 2
4096 DATA POINTS
TIME
ACQUISITION
TRIGGER
Figure 7-7. Pre-event and Post-event Triggering
To offset the beginning of the acquisition buffer relative to the acquisition trigger, use:
SENSe:SWEep:OFFSet:POINts <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).

Programming the Status Registers

You can use status register programming to determine the operating condition of the dc source at any
time. For example, you may program the dc source to generate an interrupt (assert SRQ) when an event
such as a current limit occurs. When the interrupt occurs, your program can then act on the event in the
appropriate fashion.
Figure 7-7 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 HP-IB 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.

Power-On Conditions

Refer to the *RST command description in chapter 8 for the power-on conditions of the status registers.
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