Sensor Calibration Procedures
6-2 PN: 10585-00001 Rev. P ML2437A/38A OM/PM
The message changes to SENSOR x ZERO. On successful completion of the zeroing operation,
the buzzer sounds. Sensor calibration should be performed next.
If the sensor fails the zeroing operation, the message SENSOR x ZERO fail nxnnn is
displayed. The hexadecimal error code 'nxnnn' indicates the detailed reason for the failure,
which is usually due to excessive RF noise.
The sensors can also be zeroed using the GPIB ZERO command (see Chapter 6, “GPIB
Operation”).
6-3 Sensor Calibration
Referencing power sensors to the ML243xA 50 MHz, 0.0 dBm calibrator is recommended.
Sensors should be zeroed before being calibrated, either as a separate operation or in
conjunction with calibration.
To reference the sensor, connect the sensor to the ML243xA 50 MHz, 0.0 dBm reference
output connector labelled CALIBRATOR or another 50 MHz, 0.0 dBm reference.
When the sensor is first attached, the message SENSOR x NOT ZEROED (where x = A or B
as appropriate) is displayed. Perform the sensor zeroing procedure described in Section 5-3 to
zero the sensor.
To calibrate the sensor after zeroing, press the Cal/Zero front panel key and the Cal 0 dBm
soft key, then select the appropriate sensor.
Note that if only one sensor is connected, the A-B selection is not displayed and the zeroing
process begins immediately.
On successful completion of the calibration operation, the buzzer sounds.
If the sensor fails the calibration operation, the message SENSOR x CAL 0 dBm invalid is
displayed.
Any error conditions encountered during calibration, for example the presence of extraneous
noise or RF signals, will result in an error message on the front panel display.
The sensors can also be calibrated using the GPIB CAL command (see Chapter 6, GPIB
Operation).
6-4 Sensor Zero/Cal
Sensors must be zeroed before being calibrated. The Zero/Cal function completes both
operations in sequence.
To zero and calibrate the sensor, connect the sensor to the ML243xA 50 MHz, 0.0 dBm
reference output connector labelled CALIBRATOR.
When the sensor is first attached, the message SENSOR x NOT ZEROED (where x = A or B
as appropriate) is displayed.
Press the Cal/Zero front panel key and the Zero/Cal function key, then select the appropriate
sensor. The message changes to SENSOR x ZERO. Note that the power meter automatically
switches the reference calibrator OFF during the zeroing operation.
Note
When a Universal Power Sensor with option 1 fitted is changed from T-RMS mode
to F-CW mode the user should perform a new zero/cal.
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