Multifunction Electrical Tester Calibrator
Theory of Operation
11
Active Leakage Current (IFC+LVR Board, Optional)
In active leakage current mode, the Product generates ac current with an internal ac calibrator
as the source of current. A sampling ammeter sets this value in low-resistance decade, the
output current equals the preset current value. Leakage current circuits are on the IFC board.
The ac voltage calibrator is a separated block. See
Figure 11. Active Leakage Current Circuits on the IFC Board
Substitute Leakage Current (LVR Board)
In substitute leakage current mode, the only low-resistance decade connects between the H
and L terminals. The CPU sets a resistance value that lets current flow from the preset value
according to the nominal power line voltage. See
.
Figure 12. Substitute Leakage Current from the LVR Board
Sampling
Voltmeter
AC Voltage
Calibrator
Block
Low Resistance
Decade
H
L
LC current
Shunt
Low
Resistance
Source
H
L
