Giga-tronics 8650A Series, Operation Manual

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Remote Operation
Manual 31470, Rev. E, April 2001 3-15
Sensor Zero
Zeroing automatically accounts for ground noise and other noise in your measurement system.
Measurements will be sensitive to noise-induced errors only in the lowest 15 dB of the sensor dynamic
range.
Be sure to turn off the signal going into the sensor during zeroing, otherwise a failure will be indicated .
CAL#:ZERO
Syntax : CALibration<sensor 1 or 2>:ZERO
Example : OUTPUT @Pwr_mtr;CAL1:ZERO ! Zero Sensor 1
Description : This command begins the zeroing process. Since you want to offset for measurement
circuit noise during zeroing, you want the sensor to remain attached to the measurement
circuit during zeroing. Disable the signal source into the sensor. If you cannot disable the
signal source, connect the sensor to a grounded connector (preferably RF grounded) or
leave the sensor disconnected. Do not connect the sensor to the power meter front panel
calibrator port. If the meter detects excessive RF power at the start of the zeroing process
(generally above -50 dBm for standard sensors), zeroing will automatically fail.
SENS#:TEMP?
Syntax : SENSe<sensor 1 or 2>:TEMPerature?
Example : OUTPUT @Pwr_mtr;SENS1:TEMP? ! Query sensor 1 temperature (in centigrade)
Response : Current sensor temperature in degrees centigrade
Description : This command reports sensor temperature. If the temperature varies in your operating
environment, monitor the relative temperature variations. If the variation since the previous
power sweep calibration exceeds
±5
°C (±9 °F), perform the power sweep calibration for
that sensor.
Example programs for Sensor Calibration and Zeroing are contained in Appendix A.