HC-20C
10-1
SECTION 10: CALIBRATION OF CIRCUIT BREAKER TEST SETS
Models HC-8C through HC-75C
Calibration of this HC must be performed with the laptop computer. The following items will be required to
perform the calibration.
1.
A laboratory “benchtop” multimeter
a. AC Voltage 0
– 480 with an overall accuracy of 0.3% or better.
b. AC Current from the output of your laboratory grade CT’s with trigger/memory and overall
accuracy of 0.3% or better.
2.
Laboratory grade CT’s capable of calibrating the 100, 1000 & 10000 amp ranges
with an overall accuracy of 0.3% or better.
3. A variable voltage source 0
– 480 VAC to inject into your voltage metering circuit.
Start WinHC software from the laptop. Calibration will be explained in the order they appear in the drop
down menu.
Calibrate Vernier:
This is a self calibrating function, when selected the variac will automatically run from limit to limit to adjust
the systems 0% & 100% position sensors.
Calibrate Current Meter:
When selected you will get the following screen. Enter password 8118.
After password is entered you will see the following screen.