Oscillator Gain Calibration - Pacific UPC-32 Operation Manual

SECTION 8 CALIBRATION
8.2 MANUAL CALIBRATION PROCEDURE (cont'd)
OBSERVE THE FOLLOWING WHEN CALIBRATION IS REQUIRED:
1) REMOVE ALL JEWELRY FROM ARMS AND NECK WHEN CALIBRATINGTHIS EQUIPMENT.
THIS PREVENTS THE POSSIBILITY OF SHORT CIRCUIT THROUGH THE JEWELRY,
CAUSING BURNS TO, OR ELECTROCUTION OF, THE OPERATOR.
2) WEAR SAFETY GLASSES WHEN CALIBRATING THIS EQUIPMENTTO PREVENT EYE INJURY
DUE TO FLYING PARTICLESCAUSED BY ACCIDENTAL SHORT CIRCUIT CONDITIONS.
3) DO NOT REMOVE ANY PANELS OR COVERS WITHOUT FIRST OPENING ALL CIRCUIT
BREAKERS AND THEN REMOVING THEINPUT SERVICE.

8.2.1 OSCILLATOR GAIN CALIBRATION

The first step in the MANUAL calibration process calibrates the oscillator. Nominally, the oscillator
produces 5.000 VAC
COUPLED output), depending on system gain. See Fig. 8.2 for control location. To set this level:
1. Remove top cover of the chassis.
2. Turn on the system. Load and Execute a program with the following parameters:
PROGRAM: #1
FREQ=60
#SEGS=0
3. Φ A Oscillator: Measure the power source Phase A output voltage to Neutral using the 4½ digit
DVM. Adjust R70, Phase A Oscillator Gain, until the output voltage is 125.00 VAC ±0.05
VAC .
rms
4. Φ B Oscillator: Measure the power source Phase B output voltage to Neutral using the 4½ digit
DVM. Adjust R70, Phase B Oscillator Gain, until the output voltage is 125.00 VAC ±0.05
VAC .
rms
5. Φ C Oscillator: Measure the power source Phase C output voltage to Neutral using the 4½ digit
DVM. Adjust R70, Phase C Oscillator Gain, until the output voltage is 125.00 VAC ±0.05
VAC .
rms
6. Verify the output frequency is 60.00 Hz. ± .01%. There is no adjustment for frequency.
7. Turn off the system and replace the top cover of the chassis
!
WARNING
when the system is set for 125.0 VAC
rms
FORM=3 COUPLING=DIRECT
Va=125.0
WFa=1
Ilim=50
rms
Vb=125.0 Vc=125.0
WFb=1 WFc=1
PHb=120º PHc=240º
108
(system configured for DIRECT