Operation
TESTING PRECAUTIONS
1.
The instruments must only be used by suitably trained
and competent persons.
2.
The instruments can give an electric shock. Highly
capacitive circuits (e.g. long lengths of cable) charged to
several kV can create a potentially lethal charge. Circuit
connections must
not
be touched when testing.
3.
Care must be taken to prevent capacitive circuits
becoming disconnected during a test, leaving the circuit
in a charged state.
4.
The voltmeter and automatic discharge feature of the
instruments should be regarded as additional safety
features and not a substitute for normal safe working
practice.
5
Fuse replacements
mus
t be of the correct type and
rating. See ‘
Specification
‘.
6.
If any part of the instrument is damaged, it should not be
used, but returned to the manufacturer or an approved
organization for repair.
7.
Should the plug on the power cord (
MJ359
and
MJ559
) not be the type for your receptacles (socket
outlets) do not use an adaptor. Use a suitable alternative
power cord, or if necessary change the plug by cutting
the cord and fitting a suitable plug.
The colour code of the cord is :
U.S.A.
U.K./ International
Ground)
Green
Yellow/Green
Neutral White
Blue
Line
Black
Brown
If using a fused plug, a 13 Amp fuse to BS1362 should be
fitted.
PRELIMINARY CHECKS
Battery Condition Check (
MJ459
&
MJ559
)
Before initial use of
MJ559
, charge the battery. To carry out
a battery condition check, press the black battery condition
button (marked ) and confirm that the needle settles within
the portion of the scale marked with the battery symbol. If the
needle settles at less than half scale, the cells must be
replaced (
MJ459
), or re-charged (
MJ559
) before
proceeding with any checks or testing.
Battery Replacement (
MJ459 only
)
The cells are housed in a battery compartment in the base of
the instrument. To change the cells, use a screwdriver to
remove the battery cover securing screw and lift off the
battery compartment cover. Install 6 IEC LR6 cells ensuring
that the polarity is as marked on the base of the battery
compartment. Replace and secure the battery compartment
cover.
Battery Charging
(
MJ559
)
Using the power cord supplied, connect the tester to a
standard a.c. power supply (120 V 50/60 Hz). The red
CHARGE
indicator will light to indicate that charging is in
progress. A full charge takes approximately 16 hours. The
MJ559
may be used for testing at the same time as the
battery is being charged.
5
The circuit under test
must
be completely de-energized
and isolated
before
test connections are made.
