Keysight Technologies 3458A Guide D'utilisation page 302

6 Command Reference
– If you send the NPLC (or APER) command before specifying resolution, the
– If you send the NPLC (or APER) command after specifying resolution, the
– The more common approach is the first of the two shown above; i.e., the NPLC
– Query command: The NPLC? query command returns the integration time (in
– Related commands: APER, FUNC, LFREQ, RES
Examples
In the following program, line 10 sets the number of PLCs to minimum and allows
%_resolution in line 20 to control the resolution. The resolution specified by line 20
is 100 µV.
10 OUTPUT 722;"NPLC 0" !SETS PLCS TO MINIMUM
20 OUTPUT 722;"DCV 6,.00167" !DC VOLTS, 6 V MAX, 100 µV RESOLUTION
30 END
In the following program, line 10 sets the number of PLCs to 1000. This
corresponds to maximum resolution and prevents %_resolution in line 20 from
affecting the measurement. The requested resolution from line 20 is 10 mW.
However, because of line 10, the actual resolution is 100 µW.
10 OUTPUT 722;"NPLC 1000" !SETS PLCS TO MAXIMUM
20 OUTPUT 722;"OHM 1E3,.001" !SELECTS 2-WIRE OHMS, 1 kW MAX INPUT
30 END
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interaction occurs between NPLC (or APER) when you specify resolution as
follows:
multimeter satisfies the command that specifies greater resolution (more
integration time).
multimeter uses the integration time specified by the NPLC (or APER)
command, and any previously specified resolution is ignored.
command is executed first to establish normal mode noise rejection (NMR),
then %_resolution is specified with a function or RANGE command. This
ensures you will have NMR and at least the required resolution.
units of PLCs) used by the A/D converter. Since the integration time can be set
by the APER, NPLC, or RES command, or the %_resolution parameter of a
function command or the RANGE command, it is possible for the NPLC?
command to return a different number of PLCs than was last specified by the
NPLC command.
Keysight 3458A User's Guide