52 34410A/11A/L4411A User’s Guide
2 Features and Functions
DC Measurements
Integration Time and Resolution
For dc voltage, dc current, resistance, and temperature measurements, the multimeter
provides two ways to set integration time, both of which affect the measurement
resolution. These are in the number of power–line cycles (NPLCs) and aperture (settable
in seconds).
NPLC mode. Using NPLCs sets the number of power–line cycles during which the
multimeter’s analog–to–digital (A/D) converter samples the input signal for a
measurement. The multimeter automatically detects the AC line frequency, using it and
the NPLC selection to set integration time. Use a larger NPLC value for better
resolution. Use a smaller value for faster measurements.
To obtain normal mode (line–frequency noise) rejection, you must select NPLC mode,
with an integral number of power–line cycles (for example, 1, 10, or 100 NPLC). The
following table shows the resulting resolution for each integration time value (in
power–line cycles) selected.
• Front Panel Operation: Select a dc measurement function (DC V, DC I, Ω 2W,
Ω 4W or Temp). Press as required:
...
> INTEGRATION > NPLC
Select the desired NPLC value: 0.006, 0.02, 0.06, 0.2, 1, 2, 10 or 100.
(The 34411A also allows you to select 0.001 or 0.002.) Then step through
or exit the configuration menu.
Integration Time Resolution
0.001 PLC* 30 ppm x Range
0.002 PLC* 15 ppm x Range
0.006 PLC 6.0 ppm x Range
0.02 PLC 3.0 ppm x Range
0.06 PLC 1.5 ppm x Range
0.2 PLC 0.7 ppm x Range
1 PLC (default) 0.3 ppm x Range
2 PLC 0.2 ppm x Range
10 PLC 0.1 ppm x Range
100 PLC 0.03 ppm x Range
*Model 34411A/L4411A
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