--- MPC 20 & 50 TESTER - M-981136 (vers. BD) --- Page
22
6.3.- ATTACHING AND CONNECTING THE MPC-20 or MPC-50
The "OPERATING MODE" selector must be placed on Rt.
Attaching and connecting the MPC to the system is the same as that
for testing step and touch voltage.
Connecting the current circuit using the two output sockets is also the
same.
6.4.- ATTACHING THE MEASURING ROD
One of the voltmeter cables is connected to the ground to be
measured.
The other voltmeter cable is connected to the GROUND using the
"MEASURING ROD" in an area in between the ground to be measured and the
auxiliary ground.
6.5.- TESTING VOLTAGES DUE TO ERRATIC CURRENTS
Prior to starting, press the "ERRATIC VOLTAGES" button (keeping it
pressed down).
If the Vm value remains at 0 V the presence of erratic voltages and
currents will be ruled out. If any value appears, it must be noted to be
subsequently compared with the 20 A and 50 A measurements and the
appropriate numerical corrections made).
(See section 8 "CORRECTING READ OUTS").
6.6.- TESTING GROUND RESISTANCE
If testing has to be done at 20 A (MPC-20) or at 50 A (MPC-50),
adjustments are made according to section 11.3.2.
If testing has to be done with currents below 20 A or 50 A respectively,
the adjustment is also done by trial and error between the different regulation
scales starting with the lowest (1, 2, 3, ...). Switching from one scale to another
is always done “off line”, i.e. without turning the selector key (according to
section 11.3.2.).
To Next Page
Loading...