Stanford Research Systems SR865A Operation Manual page 145

Chapter 4
FCRX?
The FCRX?
is a query only command.
Example
FCRX?
FCRY?
The FCRY?
is a query only command.
Note that
Example
FCRY?
query returns the frequency value of the FFT cursor readout (in Hz).
Returns the FFT cursor frequency value
query returns the amplitude value of the FFT cursor readout (in dB).
FCRY? only returns valid data when the SR865A display is set to FFT mode.
Returns the FFT cursor amplitude value
Programming
SR865A DSP Lock-in Amplifier
127
FCRX?
FCRY?