Keysight Technologies 3458A Guide D'utilisation page 317

Power-on %_resolution = not applicable.
Default %_resolution = .00001.
Remarks
– The reading rate is the longer of 1 period of the input signal, the gate time, or
– Period (and frequency) measurements are made using the level detection
– The leftmost digit, which is a half digit for most measurement functions, is a
– Readings made with autorange enabled take longer because the input signal
– For period (and frequency) measurements, an overload indication means the
– Related commands: ACBAND, FREQ, FSOURCE, FUNC, RES
Example
10 OUTPUT 722;"FSOURCE ACI" !SELECTS AC CURRENT AS INPUT SOURCE
20 OUTPUT 722;"PER .01" !SELECTS PERIOD MEASUREMENTS, 10 mA RANGE
30 END
Keysight 3458A User's Guide
the default reading time-out of 1.2 seconds.
circuitry to determine when the input signal crosses a particular voltage on its
positive or negative slope. (This is why you cannot use the LEVEL trigger or
sample event or the LINE trigger event when making period or frequency
measurements.) The power-on or default level triggering values select zero
volts, positive slope. You can control the level triggering voltage and coupling
using the LEVEL command. You can specify either the positive or negative
slope using the SLOPE command.
full digit (0 - 9) for period measurements.
is sampled (to determine the proper range) between readings.
voltage or current amplitude is too great for the specified measurement range.
It does not mean the applied period (or frequency) is too great to be measured.
Command Reference 6
317