Calibration Procedure - BK Precision 9120 Instruction Manual

Calibration Procedure

Before initiating the calibration procedure, the following conditions must be
assured:
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disconnect any loads connected to the power supply and turn it on
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let the power supply turned on for 1 hour, with no loads connected before
you start the calibration procedure
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calibration ambient temperature must be 25
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ambient relative humidity must be less then 80%.
On calibration procedure there are three parameters that must be calibrated:
voltage, OVP and current.
You can leave the calibration procedure at any time by turning off the power
supply or by pressing Local key.
But once you started the calibration procedure, it is recommended to finish it
and to go back to normal mode by turning off and then turning on the power
supply.
In order to be sure that the power supply will work properly in normal mode
after you leave the calibration procedure, you must turn off the power supply.
Recommended calibration interval is 1 year.
Before calibrating the power supply you must unsecure it, if secured (see
Calibration Overview section).
After you unsecured the power supply and you pressed Calibrate key, you go
to Calibrate menu. By turning the knob next options are available:
1. Volt Zero Scale
2. Volt Full Gain
3. OVP
4. Curr Zero Scale
5. Curr Full Gain
Options are selected by pressing Calibrate key.
Important note!
In order to perform a correct calibration, the calibration procedures from the
Calibrate menu must be followed in the order they are displayed by the power
supply.
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