Pacific UPC-32 Operation Manual page 83

4.6.3.1.1.1 PROGRAMMABLE OUTPUT IMPEDANCE CALIBRATION MENU (cont'd)
Calibration values for Direct coupled operation may be established via the following procedure.
1. Turn CSC OFF. Disable PROG. Zo. Execute a program in Direct coupled mode.
A. Establish the difference in output voltage between no-load and full-load voltage.
B. Divide the Voltage difference by the full-load current. The net result is the inherent direct
coupled impedance of the power source.
C. Use the result to enter in as Z-Direct for the power form used to perform this test.
2. Calibration values for XFMR coupled operation may be determined in the same manner, except the Z
direct value must be subtracted from the Z XFMR calculation prior to entering the Z XFMR value into
the UPC.
A good approximation of transformer impedance can be estimated by measuring the DC resistance
of each XFMR secondary tap. That value may be entered for Z XFMR as an alternative to using the
above procedure for measuring XFMR impedance.
NOTE: XFMR impedances may vary greatly with temperature.
4.6.3.2 LIQUID CRYSTAL DISPLAY SETUP
LIQUID CRYSTAL DISPLAY SETUP is used to set the view angle and back light intensity.
From any METER display (V/I, AMPS or POWER), press the fn key to enter SETUP MODE.
From the SETUP display, press 3 to enter GENERAL SETUP.
From the GENERAL SETUP display, press 2 to enter LIQUID CRYSTAL DISPLAY SETUP.
LIQUID CRYSTAL DISPLAY SETUP: PRESS
1 FOR VIEW ANGLE,
2 FOR BACK LIGHT,
THEN ARROWS TO ADJUST.
VIEW ANGLE:
BACK LIGHT:
V_no_load - V_full_load
Z =
I_full_load
Press 1 then use the arrow keys to adjust the view angle of the LCD as
desired.
Press 2 then use the arrow keys to adjust the back light of the LCD as
desired.
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SECTION 4 OPERATION