63
A
Leakage Current Tester 92-4A, -4D, -4E, -4G
TESTER INSIDE
Note: The principle circuit diagram shows a standard unit, for an external
supply application the transformer unit is not required. As option, the device
is deliverable with an automatic (motor) voltage control.
.
I
TESTER INSIDE
I.i
1-phase devices 92-4A, - 4E; - 4G
Power supply
Variable-ratio
transformer
Booster transformer
F1 - Main fuse
control unit T 2 A
Illustr. I.1:
Mechanical design standard
device. Special devices (Z... and
ZM...) may be different.
Measuring circuit
- complex standard-compliant network for measuring
leakage current.
Micro controller unit
- control of the test run
Booster transformer
- Booster voltage in addition to the standard mains
supply voltage.
Variable-ratio transformer
- adjusting of booster voltage - Principle circuit
diagram:
Booster
Variable-ratio
transformer
Microcontroller
External supply
Test
object
Mains
voltage
Switching
unit
Transformer
unit
~
~
Meas. circuit
Micro controller unit
Meas. amplifier
