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Measurement Accuracy and Resolution - with shorter measurement intervals
The following table shows changes to the short-term measurement accuracy and resolution with
various number of power line cycle (NPLC) measurement settings. Changes are due to the A-to-D
converter's noise performance. The table's baseline is 1 NPLC with no added noise. To determine the
measurement accuracy at shorter averaging intervals, simply calculate the percent of range to add,
then add it to the offset value in the specification table.
For example, to determine the percent of range to add to the accuracy specification of the voltage
measurement when making measurements at 0.003 NPLC, simply multiply the full voltage rating by
the "% of range added to spec value" as follows: 2000 V x 0.0015% = 30 mV. Add this number to the
offset part of the measurement accuracy specification: 150 mV + 30 mV. The new voltage
measurement accuracy is 0.04% + 180 mV at 0.003 NPLC.
NPLC @60Hz
Number of averaged points
1
3255
0.3
1000
0.1
325
0.01
33
0.003
10
0.0003
1
Excessive Dynamic Protection (all models)
To prevent the unit from disabling the output due to an excessive dynamic protection (EDP) condition,
you must limit the amplitude of any user-defined arbitrary waveform versus output frequency.
The following graph plots the maximum permissible output peak-to-peak voltage that can safely be
generated by the arbitrary waveform system at a specific frequency. The values are normalized in
terms of full scale peak to peak voltage; therefore all models are represented.
Keysight RP7970 & RP7980 Series Operating and Service Guide
Voltage Measurement
Current Measurement
% of range added to offset
% of range added to offset
0
0.0004%
0.0007%
0.0009%
0.0015%
0.005%
0
0.0015%
0.003%
0.008%
0.016%
0.056%
1 Quick Reference
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