1 U8480 Series Remote Operation
26 U8480 Series Programming Guide
Zeroing and Calibrating the U8480 Series
The U8480 Series does not require manual calibration. It is equipped with a highly
stable and accurate Internal Reference circuitry so that calibration can be
performed without an external 50 MHz 1 mW power reference.
Zeroing must be performed on the U8480 Series without the presence of RF
power at the U8480 Series input.
Zeroing
Zeroing adjusts the U8480 Series for a zero power reading. Input power to the
U8480 Series must not be present while zeroing is performed.
The CALibration[1]:ZERO:AUTO ONCE command causes the U8480 Series to
perform its zeroing routine, assuming that there is no power being applied to the
U8480 Series.
Zeroing takes approximately 15 seconds to complete.
Zeroing of the U8480 Series is recommended:
– upon power up.
– when a 5
ο
C change in temperature occurs.
– every 24 hours.
– prior to measuring low-level signals (for example, lowest 10 dB of the dynamic
range).
– when switching from or to the fast measurement mode (SENSe:MRATe FAST).
Calibration
The CALibration:AUTO ONCE command is used to calibrate the U8480 Series.
The U8480 Series performs an internal or external calibration:
– Internal calibration (CALibration:TYPE INT) utilizes the Internal Reference
Circuitry to perform calibration, and it does not require a 50 MHz 1 mW power
reference. Internal calibration is not impacted by the input power to the U8480
Series.
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