Agilent Technologies 34450A Guide de l'utilisateur Page 102

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80 34450A User’s Guide
3 Measurement Tutorial
Measurement Speed Consideration
There are two methods of integrating the sampled data taken
in the measurement, slow/medium (NPLC) and fast
(Aperture).
When you set the resolution to slow or medium, you can not
only achieve improved accuracy associated with time
averaging, but also achieve the rejection of the power- line
interference (normal mode rejection, or NMR).
Aperture is the period, measured in seconds, during which
the multimeter’s analog- to- digital (A/D) converter samples
the input signal for a measurement. A longer aperture yields
better resolution; a shorter aperture provides faster
measurements. The fast mode set a specific 1 ms
measurement period, not based on power line frequency. No
normal mode rejection is provided in aperture mode.
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