Multifunction Electrical Tester Calibrator
Theory of Operation
7
The multimeter is on the MER board. The board floats up to 2000 V above PE potential.
The Meter function (M) has these sub-functions. Push the
Mode
softkey to select each sub-
function:
• Voltmeter/ammeter
• AC/DC watt meter
•
HIPOT leakage current meter
•
Distortion and ripple coefficient meter
•
Flash test CAT I and II meter
Loop/Line Impedance (REL+COMP Board)
In the loop/line impedance function, the ground bond resistance decade is the calibrated
resistance source. The selected resistance segment is inserted into the neutral wire. Loop/line
impedance circuits connect to the power line mains and then come through the rear panel
socket. The N power line wire connects to the PE or N terminal on the front panel and switches
between loop and line impedance functions. The ground bond decade connects (as an option)
in series with the block of loop/line residual compensation.
For residual impedance measurement, the Product has a built-in resistance load, R0. The R0
resistor connects between the L - N wires during residual impedance measurements, and
creates a load for the mains voltage drop measurement. The internal voltmeter evaluates the
voltage drop and calculates the residual line impedance at the place of installation. Loop/Line
impedance circuits are on the REL board. The Compensator is on the COMP board. See
.
Note
Loop/line impedance circuits always work with L - N power line wires. Therefore, the
Product cannot trip the RCD breaker at the place of installation.
Figure 7. Loop/Line Impedance and Compensator
Loop/Line
compensator
COMP board
LINE
LINE
LOOP
COMP OFF
Preload
Line Impedance Test
L
PE
N
L
PE
N
To Internal Voltmeter
Front Panel
Terminals
Power Line
Socket
R0
COMP ON
Groud Bond
Resistance
Decade
LOOP
Содержание 5322A
Страница 6: ...iv 5322A Calibration Manual...
Страница 101: ...Multifunction Electrical Tester Calibrator Electrical Parts 95 Figure 42 Block Diagram...
Страница 102: ...5322A Calibration Manual 96...