Integration Time - HP 34401A User Manual

Chapter 3 Features and Functions
Measurement Configuration

Integration Time

Integration time is the period during which the multimeter'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).
Applies to all measurement functions except ac voltage, ac current,
frequency, and period. The integration time for the math operations
(null, min-max, dB, dBm, limit test) is the same as the integration time
for the measurement function in use.
Integration time is specified in number of power line cycles (
The choices are 0.02, 0.2, 1, 10, or 100 power line cycles. The default
is 10 PLCs.
The integration time is stored in volatile memory; the multimeter
selects 10 PLCs when power has been off or after a remote
interface reset.
Only the integral number of power line cycles (1, 10, or 100
provide normal mode (line frequency noise) rejection.
The only way to control the reading rate for ac measurements is by
setting a trigger delay (see page 79).
The following table shows the relationship between integration time
and measurement resolution.
Integration Time
0.02 NPLC 0.0001 x Full-Scale
0.2 NPLC 0.00001 x Full-Scale
1 NPLC 0.000003 x Full-Scale
10 NPLC 0.000001 x Full-Scale
100 NPLC 0.0000003 x Full-Scale
Resolution
3
s).
NPLC
s)
PLC
57