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3.1.5 Integral time
Integral time refers to the period to input signals in sampling of simulation/digit converter (A/D
Converter) on multimeter during measurement, which may influence measurement resolution (if
it is expected to gain better, it may be set longer integral time) and measurement speed (if it is
expected to gain faster measurement, it may be set shorter integral time).
Integral time setting is only suitable for all the measurement functions exclusive of AC voltage,
AC current, frequency and period. The integral time of math operation (zero digit, limits, dB
dBm and limit test) is the same as that of the used measurement functions.
Integral time is expressed by power period number (NPLC), for which 0.02, 0.1, 0.2, 1, 2,
10 and 100 power periods are available. Its default value is 10 power periods.
Integral time is stored in volatile memory, and after cutting off power or resetting interface,
multimeter will select 10PLC as the integral time.
Only the power periods in integer (1, 10 or 100PLC) provide normal mode (power
frequency noise) control.
Front panel operation: 1. During selection of resolution digit, it may indirectly set integral
time. 2. After pressing
times through keys of
3.1.6 Switch between front/rear input terminals
All the measurement conducted by input terminal can also be conducted by input terminal on
rear terminal (except 1A and 12A current measurement). It only needs to press the front and rear
input terminal switch to switch between front and rear input terminals.
After selecting the input terminal on rear panel, the Rear operation indicator will be on.
After selecting the input terminal on front panel, the Front operation indicator will be on.
3.1.7 Auto zero calibration
When auto zero calibration is started (default method), inside of multimeter will make input
signal, measure circuit separate, take a zero-input reading, and minus the foregoing reading by
the zero-input reading after each measurement. Thus it can avoid bias voltage on input circuit of
multimeter which will influence accuracy.
Auto zero calibration function is only suitable for DC voltage, DC current and two-wire
resistance measurement, and when selecting four-wire resistance measurement or ratio
measurement, auto zero calibration function will start automatically.
Auto zero calibration method is stored in volatile memory, and after cutting off power or
resetting remote interface, multimeter will automatically start auto zero calibration function.
Front panel operation: Under measurement function, after pressing
softkey of Zero calibration (
ET3260 and ET3260A
, press the softkey of Integral (
and
, and then press
), select ON or OFF through
6 1/2 Digit Multimeter
.
27
), select different integral
, then press the
and
, and then press
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