Boonton 4540 Peak Power Meter User Manual - Manual (Page 150)

Boonton 4540 Series RF Power Meter
Remote Operation 5-16
5.6.3 CALibration Subsystem
The CALibration group of commands is used to control automatic zero offset and linearity adjustments to the RF power
sensor and the channel to which it is connected. Zero offset adjustment can be performed at any time if no RF signal is
applied to the sensor. Linearity calibration requires that the sensor be connected to the instrument’s built-in RF calibrator or
a Model 2530 1GHz External Calibrator.
The numeric suffix of the CALibration commands refers to a measurement channel, that is CALibration1 and CALibration2
refer to CH1 and CH2 input channels, respectively.
Note that CALibration2 commands will generate an error if used with a single channel Model 4541. Also note that although
CALibration commands do not accept any arguments, all have a query form, which returns a status code upon completion of
the zero or calibration process. This allows the user to determine when the process has completed, and whether or not it was
successful.
CALibration:EXTernal:AUTOcal
Description: Performs a multi-point sensor gain calibration of the selected sensor with the Model 2530 external
1 GHz calibrator. This procedure calibrates the sensor’s linearity at a number of points across its
entire dynamic range.
Syntax: CALibration[1|2]:EXTernal:AUTOcal[?]
Returns: 0 if successful, 1 otherwise (using query form only)
Valid Modes: Peak and CW Power sensors only
CALibration:EXTernal:FIXedcal
Description: Performs a calibration at a fixed frequency and level. Fixed-cal does not provide for automatic
control of the internal 50 MHz or external 1 GHz calibrators. The RF output level of the calibrator
in use must be set by the user. Fixed-cal assumes that a valid Zero has already been performed.
Syntax: CALibration[1|2]:EXTernal:FIXedcal[?]
Returns: 0 if successful, 1 otherwise (using query form only)
Valid Modes: CW Power sensors only
CALibration:EXTernal:ZERO
Description: For a sensor that has been previously auto calibrated and has valid auto-cal status, performs a zero
offset null adjustment. The sensor does not need to be connected to any calibrator for zeroing –
the procedure is often performed in-system. However, this command will turn off the specified
calibrator prior to zeroing to avoid the need to perform this step explicitly.
Syntax: CALibration[1|2]:EXTernal:ZERO[?]
Returns: 0 if successful, 1 otherwise (using query form only)
Valid Modes: Any