NRDGS
206 Chapter 6 Command Reference
interaction occurs between NPLC (or APER) when you specify resolution as
follows:
• If you send the NPLC (or APER) command before specifying resolution, the
multimeter satisfies the command that specifies greater resolution (more
integration time).
• If you send the NPLC (or APER) command after specifying resolution, the
multimeter uses the integration time specified by the NPLC (or APER)
command, and any previously specified resolution is ignored.
• The more common approach is the first of the two shown above; i.e., the NPLC
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.
• Query Command. The NPLC? query command returns the integration time (in
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.
• 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 100µV.
10 OUTPUT 722;"NPLC 0" !SETS PLCS TO MINIMUM
20 OUTPUT 722;"DCV 6,.00167" !DC VOLTS, 6V MAX, 1OOµV 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 10m
W.
However, because of line 10, the actual resolution is 100µ
W.
10 OUTPUT 722;"NPLC 1000" !SETS PLCS TO MAXIMUM
20 OUTPUT 722;"OHM 1E3,.001" !SELECTS 2-WIRE OHMS, 1k
9 MAX INPUT
30 END
NRDGS
Number of Readings. Designates the number of readings taken per trigger and
the event (sample event) that initiates each reading.
Syntax NRDGS [count][,event]
count
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