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Calibration Routine Description
The calibration routine consists of a dc-offset calibration and a frequency calibration.
The calibration routine occurs immediately following the power-on tests and
periodically afterwards to compensate for any drift. The calibration routine sets the
input relays to disconnect the internal circuitry from the BNC center conductor and
shell, and connect the source (via CALP) to the input channels. Measurements are
then taken using several input paths to produce correction curves for all input ranges.
If calibration fails, the calibration routine is repeated up to two more times. Each time
calibration fails, a calibration failure message is added to the fault log. If calibration
fails all three times, a calibration failure message is displayed on the screen.
If you abort a self test before the self test is finished, the analyzer may fail its
calibration routine. To prevent this from happening, press [
Preset ][DO PRESET ]or
cycle power after you abort a self test.
To manually start the calibration routine, press the [
System Utility ][CALIBRATN ]
[
SINGLE CAL ].
To prevent the calibration routine from occurring, set the power switch to on (
l ), then
as soon as
Booting System appears on the display, press and hold in the
[
Preset ] key until Autorange in progress appears. This not only prevents the calibration
routine from occurring but also bypasses the auto start file if one exists.
Agilent 35670A Internal Test Descriptions
Calibration Routine Description
10-5