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 4
1
⁄
2
).
NPLC
Digital Filter Off
Max Digits Shown
Digital Filter On
Max Digits Shown
0.02
4
1
⁄
2
5
1
⁄
2
0.2
5
1
⁄
2
6
1
⁄
2
1
6
1
⁄
2
7
1
⁄
2
2
6
1
⁄
2
7
1
⁄
2
10
6
1
⁄
2
7
1
⁄
2
20
7
1
⁄
2
7
1
⁄
2
100
7
1
⁄
2
7
1
⁄
2
200
7
1
⁄
2
7
1
⁄
2
Chapter 3 Features and Functions
General Measurement Configuration
58
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