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10.2. Calibration Steps
10.2.1. Current Output and Read Back Calibration
This sequence sets the calibration values for the current output and the current read back meter.
NOTE:
The existing calibration values can be viewed without changing them by leaving the supply
in STANDBY mode (OPER indicator is off)
and by selecting “no” if prompted to store changes.
1. Connect the appropriate load and shunt for current calibration as determined in Section
10.1.1
and show in the diagram in section
10.1.2
.
2. Enter the
“Local Calibration Menu” as defined in Section
10.1.2
(“LCL” calibration). The
calibration menu contains a “dFLt” sub menu to load default calibration values (see
10.1.3.Restoring the default calibration values
) and it contains sub menu selections for
each calibration point (CL01 to CL08). Each calibration point should be calibrated in
numerical order (first calibrate CL01, then CL02, and so on until CL08 is calibrated). The
calibration points can be viewed in any order at any time (remain in STANBY mode to view
calibration points, calibration points are not changed while the unit is in STANDBY). The
chart in section
10.1.2
describes each calibration point and the text displayed for each
point.
3.
From the “Local Calibration Menu” rotate the current encoder until the display shows “CAL”
“CL01”. Press the voltage encoder switch to view and change CL01 (upper current output
calibration point). When CL01 is viewed the top display will show “I.Hi Out CL01”. The
bottom display shows the calibration value.
4. When calibrating the upper current output (CL01) the power supply output will be enabled
at approximately 95% of the current rating. Verify the proper load connections before
proceeding.
5.
Press the “OPER” switch to enable the power supply output.
6. Use the current encoder to adjust the output so that the volt meter across the shunt reads
the proper value for 95% of the average current rating. Calculate using -
unit current
rating x shunt voltage / shunt current x 0.95
7. There are two ways to end the calibration of CL01. The first way is to press the OPER
switch and return to standby mode (OPER/STBY lamp is off) and then press the voltage
encoder to return to the “Local Calibration Menu”. If this method is used to end CL01 then
proceed with step 8 below to calibrate CL02. Optionally it is possible to automatically
calibrate CL02 before ending CL01. To automatically calibrate CL02 press the voltage
encoder switch while the unit is still in operate mode (OPER/STBY lamp is on), the display
will momentarily change to “…” while CL02 is calibrated and then the unit will change to
standby mode (OPER/STBY lamp is off) and will return to the “Local Calibration Menu”.
8.
From the “Local Calibration Menu” rotate the current encoder until the display shows “CAL”
“CL02”. Press the voltage encoder switch to view and change CL02 (upper current meter
calibration point). When CL02 is viewed the top display will show “I.Hi mtr CL02”. The
bottom display shows the calibration value.
9. When calibrating the upper current meter calibration point (CL02) the power supply output
will be enabled at approximately 95% of the current rating. Verify the proper load
connections before proceeding. The upper current output (CL01) must be calibrated prior
to calibrating CL02.