U8480 Series Remote Operation 1
U8480 Series Programming Guide 27
– External calibration (CALibration:TYPE EXT) enables the U8480 Series to
perform calibration with a 50 MHz 1 mW power reference or a suitable power
reference.
Internal calibration is the default calibration type upon power up.
Internal calibration of the U8480 Series occurs automatically:
– upon power up.
– when a 10
ο
C change in temperature has occurred since the last calibration.
The CALibration:AUTO [ON|OFF|1|0] command controls the automatic
setting of the internal calibration.
Internal calibration takes approximately 1.5 s to complete, while external
calibration takes approximately 15 s to complete.
Calibration sequence
You can perform a complete calibration sequence in a single query:
CALibration[1][:ALL]?
This query is only applicable for the internal calibration as the U8480 Series does
not have control of the power reference in the external calibration. The calibration
sequence consists of:
1 Zeroing the U8480 Series (CALibration:ZERO:AUTO ONCE) and
2 Calibrating the U8480 Series (CALibration:AUTO ONCE).
This query enters a number into the output buffer when the sequence has
completed. If the result is 0, the sequence is successful. If the result is 1, the
sequence has failed.
Refer to “CALCulate Command Subsystem” on page 94 for further information.
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