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IEEE-488 Reference

2001-900-01 Rev. K / August 2010 4-119

4.19.6 :NPLCycles <n>

[:SENSe[1]:CURRent:AC:NPLCycles <n> Set NPLC for ACI

[:SENSe[1]]:CURRent[:DC]:NPLCycles <n> Set NPLC for DCI

[:SENSe[1]]:VOLTage:AC:NPLCycles <n> Set NPLC for ACV

[:SENSe[1]]:VOLTage[:DC]:NPLCycles <n> Set NPLC for DCV

[:SENSe[1]]:RESistance:NPLCycles <n> Set NPLC for 2

[:SENSe[1]]:FRESistance:NPLCycles <n> Set NPLC for 4

[:SENSe[1]]:TEMPerature:NPLCycles <n> Set NPLC for TEMP

Parameters <n> = 0.01 to 10 Power line cycles (n) per integration

= DEFault 1

= MINimum 0.01

= MAXimum 10

Formats :curr:ac:nplc <n> :curr[:dc]:nplc <n>

:volt:ac:nplc <n>:volt[:dc]:nplc <n>

:res:nplc <n>:fres:nplc <n>

:temp:nplc <n>

Defaults Power-up Saved power-on setup

*RST 1

:SYSTem:PRESet 1

Query :NPLCycles? Query programmed NPLC value

:NPLCycles? DEFaultQuery *RST default value

:NPLCycles? MINimumQuery minimum NPLC value

:NPLCycles? MAXimumQuery maximum NPLC value

Short-form formats: :curr:ac:nplc? :curr[:dc]:nplc?

:curr:ac:nplc? xxx :curr[:dc]:nplc? xxx

:volt:ac:nplc? :volt[:dc]:nplc?

:volt:ac:nplc? xxx :volt[:dc]:nplc? xxx

:res:nplc? :fres:nplc?

:res:nplc? xxx :fres:nplc? xxx

:temp:nplc?

:temp:nplc? xxx

where; xxx = def, min or max

Response message: 0.01 to 10

Description These commands are used to set the integration period for the measurement functions. The integration

period for a triggered reading (measurement) can be expressed by basing it on the power line frequency.

These commands and parameters are used to specify the number of power line cycles (NPLC) per inte-

gration. For example, with :NPLCycles programmed for n = 0.5, the integration period for each triggered

reading will take one-half of a power line cycle. Any triggers received while the instrument is processing

a reading will be ignored.

In general, a short integration period (small NPLC) provides a fast reading rate, while a long integration

period (large NPLC) provides better accuracy. Typically, the selected integration period is based on a

compromise between speed and accuracy.