MD-5060
6
OPERATING INSTRUCTIONS
1)
Check if there is no voltage across the points where the megohmmeter will be connected to, nor
between them and the ground.
2)
Connect the
red banana jack
terminal (
red
cable) to the megohmmeter (
-V
) terminal.
3)
Connect the
black cable
to the megohmmeter (
+R
) terminal, with the yellow terminal to the
G
terminal.
4)
The green terminal (
GUARD
) will not be always used. CIRCUTOR Application Note #32 explains
the usage of Guard terminal for minimising the parasite resistance effect, whose influence one
intends to minimise. If the measurement is performed between two parts, which are not grounded
(for example: a transformer high and low voltage windings), the megohmmeter Guard terminal
should be grounded for defining the instrument potential.
Whenever a measurement is
performed, the +R or the guard terminal should be grounded, but not both simultaneously.
If
none of these terminals are grounded, the megohmmeter can be subjected to a higher potential,
hazardous to the operator
; and the reading can result unstable and unreliable. If both terminals
are simultaneously grounded, they will be short-circuited, and the megohmmeter
will not perform
the measurement.
5) Connect the free ends of the cables in use (red and black jaw connectors) to the element to be
measured.
6) Choose the test voltage using the “VOLTAGE SELECTOR” rotary selecting switch
..
7) Check if the "
MEMORY
" key is free.
8) Press the "
On/Off
" key
.
This key should remain depressed and the "
HIGH VOLTAGE
" light
indicator will be on, indicating that the megohmmeter internal generator is applying a high voltage
to the element being tested.
9) For a few seconds, the self-scale smart system will search for the most convenient scale for the
value being measured. Meanwhile, the display will show the message "
WAIT...
" Then, the display
will show the measurement result using both digital (measurement value and unit) and analog
displays. At 30 and 60 seconds' time, the equipment will sound a beep for reminding the operator to
register the measurement at that time. If the measured value exceeds 4000 G
Ω
@ 5 kV, the
OVERRANGE
message will be read.
10) During the measurement, check if the battery is charged. Press the "
BATTERY
" key and check
the display information. If the charge is enough, it will read "
BATTERY OK
" or "
LOW BATTERY
",
should it be recharged. The analogue bar-graph will give an approximate idea of the remaining
charge percentage (at least 60% is required for a normal operation).
11) VOLTMETER : By pressing the
VOLTAGE
key, the instrument should measure the voltage
effectively applied to the element being tested.
12) MESSAGES TO THE OPERATOR : The display will show the following messages to the operator:
•
MEASURING UNIT AND RESISTANCE VALUE.
•
TIME. Indicates the test time on the display right hand side.
•
OVERRANGE
. Whenever the measured resistance is greater than 4000 G
Ω
@ 5kV.
