Keysight Technologies 3458A Guide D'utilisation page 345

SRQ
Service request. Sets bit 2 in the multimeter's status register. If bit 2 is enabled to
assert SRQ (RQS 4 command), executing the SRQ command will set the GPIB
SRQ line.
Syntax
SRQ
– Related commands: CSB, EXTOUT, RQS, SPOLL (GPIB command), STB?
Example
10 OUTPUT 722;"RQS 4" !ENABLE STATUS REGISTER BIT 2 TO ASSERT SRQ
20 OUTPUT 722;"SRQ" !SET BIT 2, ASSERT SRQ
30 END
SSAC, SSDC
Sub-sampling. Configures the multimeter for sub-sampled voltage
measurements (digitizing). The SSAC function measures only the AC component
of the input waveform. The SSDC function measures the combined AC and DC
components of the waveform. Otherwise, the two functions are identical. The
input signal must be periodic (repetitive) for sub-sampled measurements.
Sub-sampled measurements use the track/hold circuit (2 nanoseconds aperture)
and a wide bandwidth input. path (12 MHz bandwidth).
Syntax
SSAC [max._input] [,% resolution]
SSDC [max._input] [,%_resolution]
max._input
Selects the measurement range (you cannot use autorange for sub-sampled
measurements). To select a range, you specify max._input as the input signal's
expected peak amplitude. The multimeter then selects the correct range. The
following table shows the max._input parameters and the ranges they select.
Keysight 3458A User's Guide
Command Reference 6
345