58542 VXIbus Universal Power Meter
2-18
Publication 21555, Rev. E, September 2002
2.5.12.2
Sensor Zero
Zeroing automatically accounts for ground noise and other noise in the 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
.
Example programs for Sensor Calibration and Zeroing are contained in Appendix A.
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. To offset for measurement circuit noise during
zeroing, The sensor needs to remain attached to the measurement circuit during zeroing.
Disable the signal source into the sensor. If disabling the signal source cannot occur, 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.
CAL#:ZERO?
Syntax:
CALibration<sensor 1 or 2>:ZERO?
Example:
OUTPUT @PWR_MTR;CAL1:ZERO?
! ZERO SENSOR 1 & RETURN PASS/FAIL STATUS
Response:
0 = Pass; 1 = Fail
Description:
This command executes the same procedure as above except a pass/fail flag is automatically
output at either the completion of zeroing or detection of failure. The most common cause is
not turing off the source power meter before beginning the zeroing process.
SENS#:TEMP?
Syntax:
SENSe<sensor 1 or 2>:TEMPerature?
Example:
OUTPUT @PWR_MTR;SENS1:TEMP?
! QUERIES SENSOR 1 TEMPERATURE (IN CENTIGRADE)
Response:
Current sensor temperature in degrees centigrade
Description:
This command reports sensor temperature. If the temperature varies in the 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.
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