Interactive SourceMeter® Instrument Reference Manual Section 4: Source-
2450-901-01 Rev. B/September 2013 4-9
The speed setting affects the normal mode rejection ratio (NMRR) and common mode rejection ratio
(CMRR). Normal mode noise is the noise signal between the HI and LO terminals; common-mode
noise is the noise signal between LO and chassis ground. See the Model 2450 specification for
NMRR and CMRR values at different PLC settings.
After adjusting the speed, you might want to adjust the number of digits that are displayed for
measurements. See Setting the number of displayed digits (on page 2-37).
To set NPLC using the front panel:
1. Press the FUNCTION key.
2. Select the source and measurement combination.
3. From the Home page, swipe to display the SETTINGS screen.
4. Next to NPLCs, select the number. The number pad dialog box is displayed.
5. Enter the value.
6. Select OK.
You can also set the speed by pressing the MENU key. Under Measure, select Settings, and then
select the value next to NPLCs.
Using SCPI commands:
To set the number of PLCs for current measurements, send the command:
:SENSe:CURRent:NPLCycles <n>
To set the number of PLCs for resistance measurements, send the command:
:SENSe:RESistance:NPLCycles <n>
To set NPLCs for voltage measurements, send the command:
:SENSe:VOLTage:NPLCycles <n>
Where <n> is a value from 0.01 to 10, with 0.01 resulting in the fastest reading rates and 10 resulting
in the lowest reading noise.
For example, to set NPLC for resistance measurements to 0.5, send the command
RES:NPLC 0.5
Using TSP commands:
To set NPLC, send the command smu.measure.nplc. For example, to set the NPLC value to 0.5
for voltage measurements, send the commands:
smu.measure.func = smu.FUNC_DC_VOLTAGE
smu.measure.nplc = 0.5
To assign a different measurement function, replace smu.FUNC_DC_VOLTAGE with one of the
following:
• For current measurements: smu.FUNC_DC_CURRENT
• For resistance measurements: smu.FUNC_RESISTANCE
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