HP 8753E Programming And Command Reference Manual page 168

These commands select the sensor input being used with the HP 438A
power meter. For the HP 436A or 437B, the A sensor is always used:
HP-IB Progrm 'ng and Command Reference Guide
Increments the value in the active entry
area (up key).
Puts the analyzer in pass control mode.
Sensor A.
Sensor B (available with HP 438A only).
Enters the velocity factor of the
transmission medium. Range: 0 to 10.
Displays the measurement trace (ON) or
the mixer setup (OFF).
Sets the local oscillator frequency for
use in frequency offset mode. See also
instrument.
Waits for a clean sweep when used with
the OPC command.
Selects waveguide electrical delay. (See
also COAD.)
Specifies a waveguide standard while
defining a standard as part of a cal kit
modification, as opposed to coaxial.
Turns the bandwidth search ON and OFF.
Enters the widths search parameter.
Range: amplitude range.