Pacific UPC-32 Operation Manual page 125

8.3 EXTERNALLY REFERENCED CALIBRATION (cont'd)
The UPC has 2 separate current metering circuits, one for FORM 1 (single phase), 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).
UPC-32 a. Operate the power source in FORM 1 to calibrate I1 (single phase).
Only the phases existent need to have values entered. If a phase parameter is not used or 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 correction factors are stored in Battery-backed memory (RAM) until the memory is lost or
cleared.
b. Operate the power source in FORM 2 to calibrate Ia and Ib (single/split phase).
b. Operate the power source in FORM 3 to calibrate Ia, Ib and Ic (three phase).
113
SECTION 8 CALIBRATION