34410A/11A User’s Guide 53
Features and Functions 2
Measurement Time and Resolution
The table below lists the measurement time configuration options available
for the multimeter, for each measurement function.
DC, Resistance and Temperature Measurements
For dc voltage, dc current, resistance and temperature measurements
only, the multimeter allows for 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.
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.
Selecting a larger NPLC value yields better resolution; a shorter value
provides for faster measurements. Choices are 0.001
*, 0.002*, 0.006, 0.02,
0.06, 0.2, 1, 2, 10 or 100 (PLCs).
*These two additional settings are provided on Model 34411A only.
• To allow for normal mode (line frequency noise) rejection, you must
select an integral number of power line cycles (e.g. 1, 10 or 100 NPLC).
Measurement Function Selectable Measurement Time Parameter(s)
dc voltage, dc current,
resistance, temperature
NPLC Values: 0.001*, 0.002*, 0.006 , 0.02, 0.06 , 0.2,
1, 2, 10, 100 (PLCs)
Aperture Values: settable from 300 3s to 1s
**
ac voltage, ac current AC Filter Values: 3 Hz, 20 Hz, 200 Hz
frequency / period AC Filter Values: 3 Hz, 20 Hz, 200 Hz
Gate Time Values: 0.001, 0.01, 0.1, 1 second
capacitance, continuity
check, diode check
fixed measurement time
– no selectable parameters
*These two settings are provided on model 34411A only.
**Model 34411A is settable down to 100 3s.
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