PC5 SERIES WATT TRANSDUCER CALIBRATION MANUAL
Page 11
Energize the voltage and apply 120 VAC,
now energize the current and apply the
necessary current or obtain a reading of 375
watts on the Standard Wattmeter. Adjust
the "CAL" trimpot (located on the PC5-7.5D
lid) for a 10 VDC ±0.001 V reading at
terminals 1 & 2.
With the voltage maintained at 120 VAC,
change the current such that the power
reading goes from 0 to 375 watts or 75% full
scale. The output should not change more
than ±0.005V from the Standard Wattmeter
reading or ±0.5% FS. Likewise, hold the
current at 3.75 amperes and change the
voltage such that the power reading goes
from 0 to 375 watts. Next, with the voltage
potential at 120 V and current adjusted for a
power reading of 375 watts, change the
power factor from unity to zero for both lead
and lag. Both current and voltage linearity
should be within ±0.5% FS.
D
Example: (30/ 4W, 3 Element)
Model
PC5-007A
Voltage
120 VAC
Current
5 A AC
Rated Output
1 mA @ 1500 Watts
Load On Output Required
10 K
Ω
± 0.05%
External Sensor Required
None
Test Connections Drawing
Figure 9B
Standard Wattmeter Set-Up
120 V, 5 A FS @ 500 W
Accuracy
± 0.5% FS
Refer to Figure 10A or 10B Calibration Test
Set-Up on page 17, make the required
connections between the calibration and the
direct connections in Figure 9B on page16.
Energize the voltage and apply 120 VAC,
now energize the current and then apply the
necessary current to obtain the 500-watt
reading on the Standard Wattmeter.
Adjust the "CAL" trimpot (located in the
PC5-007A lid) for a 1 VDC ±0.001 V reading
at terminals 1 & 2.
With the voltage maintained at 120 VAC,
change the current from 0 to 500 watts. The
output should not change more than ±0.005
V from the standard wattmeter reading of
±0.5% FS.
Since the PC5 has option A, the voltage
should be between 85 to 135 VAC because
the amplifier power supply uses the input
voltage. Voltage linearity can not be
checked. Adjust the current back to 500
watts and change the power factor from
unity to zero for both lead and lag. The
output should be within ±0.005 V or ± 0.5%
FS.
