TB 9-6130-285-24
Model 6654A Calibration
Action
Display Response
a. Enable Calibration Mode
PASWDl
.
(1) Begin calibration by pressing
(2) Enter calibration password using Entry keypad.
(a) If password is correct the Cal enunciator will
come on.
PASSWD ERROR
(b) If password is incorrect, an error occurs.2
NOTE
The initial (factory-default) password is
the model number of the power supply,
but it can be changed.
b. Enter Voltage Calibration Values
(1) Make certain the MULTIMETER is the only load on
(Meter mode)
the power supply.
VRDG1
.
(2) Select the first calibration point by pressing
WRONG MODE
(3) If the power supply is not in CV mode, an error
(Meter mode)
occurs.3
(4) Read the MULTIMETER and use the Entry keypad
to enter the first voltage value.
VRDG2
(5) Select the second calibration point by pressing
(Meter mode)
again.
(6) Read the MULTIMETER and use the Entry keypad
to enter the second voltage value.
NOTE
If one of the entered values is not within
CAL ERROR
acceptable range, an error occurs. The
power supply is now holding the new
voltage calibration constants in RAM.
(Meter mode)
c. Calibrate OVP Trip Point
(1) Make certain the voltage has been calibrated and
there is no load on the power supply.
OVPCAL
(2) Select OVP calibration by pressing
.
CAL COMPLETE
(3) Wait for the power supply to compute the OVP
calibration constant.
(a) If the supply goes unregulated or into CC mode
NOT CV MODE
during OVP calibration, an error occurs.
DOES NOT CAL
(b) If the computed constant is out of acceptable
range, an error occurs.
(4) Wait for the power supply to compute the new OVP
calibration constants, which will be stored in RAM.
A-3
