2-16
Basic Power Supply Operation
NPLC rate
The integration (reading) rate of the instrument is specified as a parameter based on the num-
ber of power-line cycles (NPLC), where 1 PLC for 60Hz line frequency is 16.67msec (1/60). In
general, the fastest integration time (0.01 PLC) results in increased reading noise. The slowest
integration time (10 PLC) provides the best common-mode and normal-mode rejection.
In-between settings are a compromise between speed and noise.
The NPLC RATE #1/#2 item of the menu is also used to set the reading rate for DVM mea-
surements. Note that it is not used to set the integration rate for pulse current and long integration
measurements. These measurements are covered in Sections 3 and 4, respectively.
Average readings
The average reading count (1 to 10) specifies the number of measurement conversions to
average for each reading. For example, with a reading count of 5, each displayed reading will be
the average of five measurement conversions.
The AVER READINGS #1/#2 menu items are also used to set the average reading count for
DVM measurements. Note that it is not used to set the average reading count for pulse current
(see Section 3) or long integration measurements (see Section 4).
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