3458A Datasheet, PDF (14/27 Pages) Keysight Technologies – Shattering performance barriers of speed and accuracy

Section 4: AC Voltage
General Information
The Keysight 3458A supports three techniques for measuring true rms AC voltage, each offering unique capabilities. The desired
measurement technique is selected through the SETACV command. The ACV functions will then apply the chosen method for
subsequent measurements.
The following section provides a brief description of the three operation modes along with a summary table helpful in choosing the
technique best suited to your specific measurement need.
SETACV SYNC
Synchronously Sub-sampled Computed true rms technique.
This technique provides excellent linearity and the most accurate measurement results. It does require that the
input signal be repetitive (not random noise for example). The bandwidth in this mode is from 1 Hz to 10 MHz.
SETACV ANA
Analog Computing true rms conversion technique.
This is the measurement technique at power-up or following an instrument reset. This mode works well with
any signal within its 10 Hz to 2 MHz bandwidth and provides the fastest measurement speeds.
SETACV RNDM Random Sampled Computed true rms technique.
This technique again provides excellent linearity, however the overall accuracy is the lowest of the three modes.
It does not require a repetitive input signal and is threfore well suited to wideband noise measurements. The
bandwidth in this mode is from 20 Hz to 10 MHz.
Synchronous Sub-sampled Mode (ACV Function, SETACV SYNC)
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