6: SCPI command reference Model 2450 Interactive SourceMeter® Instrument
6-48 2450-901-01 Rev. B/September 2013
[:SENSe[1]]:<function>:NPLCycles
This command sets the time that the input signal is measured for measurements of 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?
[:SENSe[1]]:<function>:NPLCycles? DEFault
[:SENSe[1]]:<function>:NPLCycles? MINimum
[:SENSe[1]]:<function>:NPLCycles? MAXimum
The measurement function to which this setting applies:
• Current: CURRent[:DC]
• Resistance: RESistance
•
The number of power-line cycles for each measurement: 0.01 to 10
Details
This command sets the amount of time that the input signal is measured.
The amount of time is specified in parameters that are based on 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).
This command is set for the measurement of specific functions (current, resistance, or voltage).
The shortest amount of time (0.01 PLC) results in the fastest reading rate, but increases the reading noise and
decreases the number of usable digits.
The longest amount of time (10 PLC) 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 send this command without the <function> parameter, it sets the NPLCs for all functions.
Example 1
Sets the measurement time for current
measurements to 0.0083 (0.5/60) seconds.
Example 2
Sets the measurement time for resistance
measurements to 0.0083 (0.5/60) seconds.
Example 3
Sets the measurement time for voltage
measurements to 0.0083 (0.5/60) seconds.
Also see
Using NPLCs to adjust speed and accuracy (on page 4-8)
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