SENSe:FREQuency:MODE
Syntax
[SENSe:]FREQuency:MODE {AUTO | RECiprocal | CONTinuous}
[SENSe:]FREQuency:MODE?
Description
This command selects the measurement mode for frequency, frequency ratio, and average period on
channels 1 and 2. Channel 3 measurements are always made in resolution-enhanced mode.
l AUTO configures the instrument to make resolution-enhanced measurements when possible, or recip-
rocal measurements otherwise. This provides the best possible measurement resolution for any input
signal and gating configuration.
l RECiprocal configures the instrument to make reciprocal-only measurements.
l CONTinuous configures the instrument to make continuous resolution-enhanced, gap-free meas-
urements. This mode should be selected for true Allan deviation computation (CALCulate:AVERage
subsystem). In this mode, all samples for a each trigger are started by a single gate open (instead of
gate open/close per sample), and the measurements are computed back-to-back with no dead time.
CONTinuous can only be used for frequency and average period measurements. Available only on the
Keysight 53230A.
Remarks
l The trigger count setting (TRIGger:COUNt) is ignored when making continuous, gap-free frequency and
period measurements. Only one trigger will be accepted for each READ? or INITiate[:IMMediate] com-
mand.
l The instrument sets the frequency measurement mode to AUTO after a Factory Reset (*RST command)
or an Instrument Preset (SYSTem:PRESet command).
Return Format
The query returns the frequency measurement mode: AUTO, REC, or CONT.
Examples
The following example makes a frequency measurement on channel 1 with a 1 second gate time using the
reciprocal measurement technique:
CONF:FREQ 1.2E6
FREQ:GATE:SOUR TIME
FREQ:GATE:TIME 1.0
Keysight 53220A/53230A Programmer's Reference 329
SENSe:FREQuency:MODE
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