Remarks
l
As defined in the SCPI standard, <resolution> must be specified in absolute frequency (hertz), not as a
fraction of the input signal frequency.
l The frequency of the first channel in the channel pair is used as the numerator of the ratio; the second
channel as the denominator.
l The input channels are configured for auto-leveling at 50% with a positive slope.
Because this command enables auto-leveling on channel 1 and/or 2, if selected, it
should not be used if the input frequency is lower than the minimum input signal fre-
quency for auto-leveling (see SYSTem:ALEVel:FREQuency command). You should use
CONFigure:FREQuency:RATio, INPut:LEVel{1|2}, and READ? instead of
MEASure:FREQuency:RATio?.
l The gate source (see SENSe:FREQuency:GATE:SOURCE) is set to TIME.
l
The counter uses the <expected> and <resolution> parameters to configure the setting for the
SENSe:FREQuency:GATE:TIME command. The table below shows the relationship between relative res-
olution and gate time in seconds, where relative resolution = <resolution> / <expected>.
Relative Resolution
Gate Time
(53220A)
Gate Time
(53230A)
≤ 1.1E-14 1000 sec 1000 sec
>1.1E-14 to ≤1.1E-13 1000 sec 100 sec
>1.1E-13 to ≤1.1E-12 100 sec 10 sec
>1.1E-12 to ≤1.1E-11 10 sec 1 sec
>1.1E-11 to ≤1.1E-10 1 sec 100 msec
>1.1E-10 to ≤1.1E-9 100 msec 10 msec
>1.1E-9 to ≤1.1E-8 10 msec 1 msec
>1.1E-8 to ≤1.1E-7 1 msec 100 usec
>1.1E-7 to ≤1.1E-6 100 usec 10 usec
>1.1E-6 100 usec 1 usec
Return Format
The query returns a single measurement. The format of the measurement is controlled by the FORMat
Subsystem commands.
Examples
The following example configures the instrument for frequency ratio measurements between channel 1
and channel 2 using default parameters, makes one measurement, and then transfers the measurement
to the instrument output buffer.
MEAS:FREQ:RAT?
Typical Response: +1.00230000000000E+001
MEASure:FREQuency:RATio?
252 Keysight 53220A/53230A Programmer's Reference
To Next Page
Loading...
