Keysight 34420A - Integration Time

Features and Functions 3
Keysight 34420A User’s Guide 71
– The analog filter is available for the 1 mV, 10 mV, and 100 mV ranges.
Integration Time
Integration time is the period during which the meter’s analog-to-digital (A/D)
converter samples the input signal for a measurement. Integration time affects the
measurement resolution (for better resolution, use a longer integration time), and
measurement speed (for faster measurements, use a shorter integration time).
– Integration time is specified in number of power line cycles (NPLCs). The
choices are 0.02, 0.2, 1, 2, 10, 20, 100, or 200 power line cycles. The default is
10 NPLCs.
– The integration time is stored in volatile memory; the meter selects 10 NPLC
when power has been off or after an interface reset.
– Only the integer number of power line cycles (1, 2, 10, 20, 100 or 200 NPLC)
provide normal mode (line frequency noise) rejection.
– Integration time is related to the maximum number of digits the meter will
display. You can always choose to show fewer digits than the maximum
allowed (the minimum number of digits shown is 4½).
NPLC
Digital Filter Off
Max Digits Shown
Digital Filter On
Max Digits Shown
0.02 4½ 5½
0.2 5½ 6½
16½ 7½
26½ 7½
10 6½ 7½
20 7½ 7½
100 7½ 7½
200 7½ 7½