Features and Functions 3
Keysight 34420A User’s Guide 73
noise measurements for the 1 mV range with the low thermal shorting plug
applied to the input terminals. Other functions and ranges will exhibit similar
noise reduction characteristics versus NPLC.
For example, if you set the NPLC to 20 and enable the digital filter set to FAST (10
reading average), the equivalent NPLC is 200. At an equivalent NPLC of 200, the
reading rate is approximately 6 readings per minute (digital filter fully settled) and
the typical noise level expected is 1.6 nVrms.
Alternately, if you take readings every 5 minutes, you can set an equivalent NPLC
of 5000 to minimize the noise in the measurement. An equivalent NPLC of 5000
could be obtained by setting the integration time to 100 NPLC and enabling the
digital filter set to MEDIUM (50 reading average). At this equivalent NPLC, a
typical noise level of 0.35 nVrms can be expected.
– Front Panel operation: Integration time can be set indirectly when you select
the number of digits (see page 54).
You can also set the integration time in the MEASurement menu with the
2: INTEGRATE command.
Enable the digital filter and set the filter reading average as described on
page 68.
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