15
9. How to perform tests
After having set the desired measurement, press
Σ
key. The HIGH
VOLTAGE indicator will turn on indicating that the megohmmeter is
applying high voltage to the element under test. During some seconds the
intelligent auto- range system will search for the most convenient range for
the value under measure. At this moment the display will show the message
“WAIT...”. As soon as the MD-5075x selects the appropriate scale, the
display will show the number of tests, the selected voltage value, exhibiting
the value of the applied voltage and of the leakage current, date and time,
will start counting the elapsed time and the resistance value indication will
be exhibited with its corresponding unit, and the analogue indication will
start by bar-graph. In order to end tests, press the
Υ
key. At that moment,
last measured values will remain frozen in the MD-5075x display. By
pressing the
Υ
key again, the equipment will return to the voltmeter
function.
Example:
The measured value is 602G
Ω
with voltage
selected of 2,500V. The display exhibits the
number of tests (00012), the measured resistance
value (602G
Ω)
, the elapsed time (06:25 minutes),
the applied voltage (2.51kV), the leakage current
(4.15nA), both the date and time.
Note: If the resistance to be measured overpasses the 5T
Ω
@ 5kV limit, the
following message will be exhibited: R > 5T
Ω
Ω
Ω
Ω
ATTENTION: Please, never connect or disconnect test cables with the
megohmmeter under operation or while the High Voltage led is on. If there
is a need to modify connections, this should be done with the equipment
disconnected and with discharged potentials (High Voltage led off)
