SECTION 8 CALIBRATION
102
8.3 EXTERNALLY REFERENCED CALIBRATION (continued)
To calibrate the UPC metering:
NOTE: It is recommended that the existing calibration factors (kFactors) should be recorded for
reference (fn,4,3), and set to default (1.000) value (fn,4,1) before starting calibration. That allows
restoration to the existing condition if a problem is encountered.
1. Apply power to the power source and UPC.
2. Press fn to invoke the SETUP menu.
3. Press 4 to select the 'CALIBRATION' menu.
CALIBRATION MENU:
1 RESET ALL KFACTORS
2 EXTERNALLY REFERENCED METER CALIBRATION
3 KFACTOR DISPLAY
4. Press 2 to select EXTERNALLY REFERENCED METER CALIBRATION
Press EDIT to allow voltages to be entered.
Press ENTER to advance the cursor.
Ф INT.V-SENSE EXT.V-SENSE | I1 0.00
A 0.000 0.000 | Ia 0.00
B 0.000 0.000 | Ib 0.00
C 0.000 0.000 | Ic 0.00
5. Enter the measurements taken with external test equipment (voltmeter, ammeter) for each
parameter shown on the UPC display. All measurements taken are to be AC RMS (True
RMS metering is absolutely necessary), Line to Neutral only for voltages.
6. Upon completion, press EXECUTE.
NOTE: When calibrating EXT.V-SENSE, the External Sense terminals at the rear of the power source must
be connected to the output voltage and the output must be enabled.
The UPC has one current metering circuit for FORM 1, and another for FORM 2 and FORM 3. In order to
fully calibrate all current meters for all power forms, this procedure must be performed twice.
UPC-12 a. Operate the power source in FORM 1 to calibrate I1 (single phase).
b. Operate the power source in FORM 2 to calibrate Ia and Ib (single/split phase).
UPC-32 a. Operate the power source in FORM 1 to calibrate I1 (single phase).
b. Operate the power source in FORM 3 to calibrate Ia, Ib and Ic (three phase).
Only existent phases need to have values entered. If a phase is not available as in the case of a 1 or 2
phase power source, the phase C parameters should be set to 0. Entering 0 for a parameter causes the
correction factor (kFactor) for that parameter to be set to the system default value, 1.0000.
NOTE: Only I1 or Ia, Ib and Ic can be entered depending upon the power form currently in use.
NOTE: Voltages are to be entered as AC RMS, LINE TO NEUTRAL only for voltages.
Currents are to be entered as AC RMS.
Each time a non-zero value is entered, the UPC measures the output signal for that parameter and
compares it against the entered external meter calibration value. A new calibration factor (k factor) is then
calculated and used to correct the meter display for that value.
If a value for a parameter is not keyed in, the existing calibration factor will remain in memory and will not be
re-calculated. The kfactors are stored in memory until the memory is lost or cleared.
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