[SENSe:]STRain:NPLCycles {<PLCs> | MIN | MAX | DEF} [, (@<ch_list>)]
[SENSe:]STRain:NPLCycles? [{(@<ch_list>) | MIN | MAX | DEF}]
Sets the integration time in number of power line cycles (PLCs) for strain measurements. Integration time is the
period that the instrument's analog-to-digital (A/D) converter samples the input signal for a measurement. A longer
integration time gives better measurement resolution but slower measurement speed.
Parameter Typical return
<PLCs>: {0.001 | 0.002 | 0.006 | 0.02 | 0.06 | 0.2 | 1 | 2 | 10 | 20 | 100 | 200} +1.00000000E+00
Configure strain measurements using a 10 PLC integration time. Then make and read one measurement:
CONF:STR:QUAR (@101)
STR:NPLC 10, (@101)
READ?
Typical Response: +6.27530000E-01
– Only the integral number of power line cycles (1, 2, 10, 20, 100, or 200 PLCs) provide normal mode (line fre-
quency noise) rejection.
– Setting the resolution also sets the integration time for the measurement. The following table shows the rela-
tionship between integration time, and measurement resolution.
Integration time Resolution
0.001 PLC 0.000030 x Range
0.002 PLC 0.000015 x Range
0.006 PLC 0.000006 x Range
0.02 PLC 0.000003 x Range
0.06 PLC 0.0000015 x Range
0.2 PLC 0.0000007 x Range
1 PLC 0.0000003 x Range
2 PLC 0.00000022 x Range
10 PLC 0.0000001 x Range
20 PLC 0.00000008 x Range
100 PLC 0.00000003 x Range
200 PLC 0.000000022 x Range
– The specified integration time is used for all measurements on the selected channels. If you have applied mX+b
scaling or have assigned alarms to the selected channel, those measurements are also made using the specified
integration time. Measurements taken during the Monitor function also use the specified integration time.
–
You can also set the integration time by specifying an aperture time (see [SENSe:]STRain:APERture command).
However, note that specifying integration time using NPLCs executes faster and offers better noise rejection char-
acteristics for values of NPLC greater than 1.
252
Keysight DAQ970A/DAQ973A Programming Guide
2 SCPI Programming
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