7½ Digit Graphical Sampling Multimeter Reference Manual Section 6:
DMM7510-901-01 Rev. B / May 2015 6-85
[:SENSe[1]]:<function>:NPLCycles
This command sets the time that the input signal is measured for the selected function.
Type Affected by Where saved Default value
Instrument reset
Power cycle
Measure configuration list
Measure configuration list
Usage
[:SENSe[1]]:<function>:NPLCycles <n>
[:SENSe[1]]:<function>:NPLCycles DEFault
[:SENSe[1]]:<function>:NPLCycles MINimum
[:SENSe[1]]:<function>:NPLCycles MAXimum
[:SENSe[1]]:<function>:NPLCycles?
[:SENSe[1]]:<function>:NPLCycles? DEFault
[:SENSe[1]]:<function>:NPLCycles? MINimum
[:SENSe[1]]:<function>:NPLCycles? MAXimum
The function to which the setting applies; see Functions
The number of power-line cycles for each measurement: 0.0005 to 15 (60
Hz) or 12 (50 Hz)
Functions
Details
This command sets the amount of time that the input signal is measured.
The amount of time is specified as the number of power line cycles (NPLCs). Each PLC for 60 Hz is
16.67 ms (1/60) and each PLC for 50 Hz is 20 ms (1/50). For 60 Hz, if you set the NPLC to 0.1, the
measure time is 1.667 ms.
The shortest amount of time results in the fastest reading rate, but increases the reading noise and
decreases the number of usable digits.
The longest amount of time provides the lowest reading noise and more usable digits, but has the
slowest reading rate.
Settings between the fastest and slowest number of PLCs are a compromise between speed and
noise.
If you change the PLCs, you may want to adjust the displayed digits to reflect the change in usable
digits.
The measurement time can also be set as an aperture time. Changing the NPLC value changes the
aperture time and changing the aperture time changes the NPLC value.
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