Keithley 6517B Reference Manual

Model 6517B Electrometer Reference Manual Section 14: SCPI command reference
6517B-901-01 Rev. C / August 2015 14-61
:NPLCycles <n>
This command is used to set NPLC for volts, amps, ohms, and coulombs.
Usage
[:SENSe[1]]:VOLTage[:DC]:NPLCycles <n>
[:SENSe[1]]:CURRent[:DC]:NPLCycles <n>
[:SENSe[1]:RESistance:NPLCycles <n>
[:SENSe[1]]:CHARge:NPLCycles <n>
:NPLCycles?
:NPLCycles?
:NPLCycles?
:NPLCycles?
<n>
 0.01 to 10: Power line cycles per integration
 DEFault: 1
 MINimum: 0.01
 MAXimum: 10
Details
The integration period (measurement speed) for the Model 6517B can be set using either of two
commands; :APERture or :NPLCycle. Aperture specifies time (in seconds) per integration, while
NPLC expresses the integration period by basing it on the power line frequency.
When the integration period is set using the :NPLCycles command, the time value for the
:APERture command changes accordingly to reflect the new integration rate. Conversely, if the
integration period is set using the :APERture command, the value for the :NPLCycle command
changes accordingly.
On power-up, the instrument uses the NPLC value to determine the integration period.
Also see
:APERture <n> (on page 14-59)

Keithley 6517B Specifications

General

Input Impedance	>200 TΩ
Electrometer Type	Electrometer/High Resistance Meter
Current Measurement Range	20 fA to 20 mA
Display	Vacuum Fluorescent Display
Communication Interfaces	IEEE-488 (GPIB), RS-232
Power Supply	100 V / 120 V / 220 V / 240 V; 50 Hz / 60 Hz
Resistance Measurement Range	Up to 200 TΩ