Megger MEG10-01 User Manual

M

M E G 1 0 - 0 1
10 kV Insulation Tester

USER MANUAL

GSAFETY WARNINGS

■ This instrument must only be used by suitably trained and competent persons.

■ The circuit under test must be switched off, de-energised and isolated before insulation test connections are made.

■ Circuit connections must not be touched during an insulation test.

■ After completion of an insulation test, capacitive circuits must be discharged before disconnecting the test leads.

■ Turning the instrument off, and manually discharging circuits on completion of tests is recommended as standard procedure, before touching the test

leads.

■ In certain circumstances, breakdown of the circuit under test may cause the instrument to terminate the test in an uncontrolled manner, possibly

causing a loss of display while the circuit remains energised. In this event, it is even more important that the ‘ON/OFF’ key is pressed, and the
circuit manually discharged before touching any connections.

■ Test leads, including crocodile clips, must be in good order, clean and with no broken or cracked insulation.

■ The instrument should not be used if any part of it is damaged.

■ Water on the surface of the instrument may lead to erroneous results. It is recommended that the instrument is not used in wet weather conditions.

■ This instrument is not intrinsically safe and must not be used in hazardous atmospheres.

2

NOTE

THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS.

Symbols used on the instrument are:

F Caution: risk of electric shock
G Caution: refer to accompanying notes
t Equipment protected throughout by Double

Insulation (Class II)

c Equipment complies with current EU directives.

CONTENTS

3

SAFETY WARNINGS 2

INTRODUCTION 4

Power cord and charging the batteries. 4

QUICK START 5

INSTRUMENT CONTROLS AND INDICATORS 6

On / Off Button. 8
PI / IR 8
Voltage Adjust 8
Timer Adjust 8
Test Button 9
Display Button 9
Test Terminals 9
RS232 socket 9
Recording to on board memory 10
Recording to a PC 10
Downloading Results 10
Deleting Test Results 10
HV ON led 10
Battery Condition Indicator. 11
Voltage Indicator 11
Time Indicator 11
The Guard Terminal 11

SPECIFICATIONS 12
REPAIR AND WARRANTY 13

the HV ON l.e.d. will illuminate green. To fully recharge completely
exhausted batteries takes 14 hours. The batteries cannot be recharged
while using the instrument.

The MEG10-01 must be used without connection to ground. As most
power cords are supplied with three core leads the MEG10-01 is fitted
with a two pin IEC60320 connector that will accept both three pin and
two pin counterparts.

The colour code of the cord is:

International USA

Earth/Ground Yellow/Green Green

Neutral Blue White

Phase (Line) Brown Black

If using a fused plug, a 3 Amp fuse to BS1362 should be fitted.

Note:

A plug severed from the power cord should be destroyed, as a plug
with bare conductors is hazardous in a live socket outlet.

INTRODUCTION

4

The MEG10-01 is a compact microprocessor controlled high voltage d.c.
insulation tester, which may be powered by internal rechargeable
batteries or by connection to a mains supply. Measurement results are
clearly displayed on the digital and analogue LCD display.

The measurement range is up to 500 GΩ on the digital display and to
1 TΩ on the analogue scale. Test voltages of 500 V, 1000 V, 2500 V,
5000 V and 10000 V are available and are selected by a two buttons on
the front panel.

An integral timer is started automatically on commencement of a test,
which displays elapsed time in minutes and seconds. This timer may
also be used to automatically stop an insulation resistance test and an
automatic Polarisation Index test. At the end of any test, capacitive
loads are automatically discharged and the decaying voltage is displayed
until it reaches a safe level. At any point, a flashing LED and segments
on the display indicate the presence of a dangerous voltage.

The battery condition is continually monitored while the instrument is
switched on and the battery condition is shown by a 5-segment bar
graph on the display.

Power is provided by a mains supply or from an internal rechargeable
battery which when fully charged is capable of providing at least 4
hours continuous testing before requiring recharge.

Power cord and charging the batteries.

If the power cord supplied is not suitable for your type of socket outlet,
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 instrument may be connected to a 50/60 Hz, 100 to 240 Volt supply.
This supply will power the instrument if the instrument is switched on,
or will charge the batteries if the instrument is switched off. If charging,

test. The ‘Voltage at Terminals’ arrows flash and the ‘HT On’ l.e.d.
flashes red to signify that the test is running. During the test the test
voltage at the instrument terminals will appear in the ‘Voltage
Indicator’ and the elapsed time will appear in the ‘Time Indicator’.
The measured value of resistance will appear in both analogue and
digital displays. You can stop the test at any time by pressing the ‘Test
Start / Stop’ button, or the test will stop automatically after the preset
test time. The item under test will be automatically discharged to a safe
level and the final measured values will be shown on the display.

Return to the initial screen by pressing any of the ‘Voltage Adjust’ or
‘Time Adjust’ buttons briefly.

QUICK START

5

Refer to the next page for location of controls

Connect the test leads to the instrument + and – terminals and to the
item to be tested. Ensure the instrument battery is charged, or connect
to a suitable external supply. Press the ‘On / Off’ button and wait until
the word ‘CAL’ disappears from the display.
To carry out a test requires only three decisions:

1. What type of test do I want?

The options are Insulation Resistance (IR) or Polarisation Index (PI),
which are selected by briefly pressing the PI button to the left of
the display. If PI is selected the ‘PI Test’ indicator at the top of the
display will illuminate. If IR is selected the ‘PI Test’ indicator will
be blank.

2. What test voltage do I want?

Use the ‘Test Voltage increase / decrease’ buttons to the left of
the display to adjust the test voltage up or down until the required
value is shown in the ‘Voltage Indicator’, top left of the display.

3. Do I wish the automatic timer to control the test?

Adjust the test duration using the ‘Test Duration increase /
decrease’ buttons to increase or decrease the test time, which can
be seen in the ‘Time Indicator’ display. If a valid time has been
selected the ‘Timer On’ indicator will light. Selecting 00:00 turns
the timer off.

If PI has been selected as the test type the timer will default to 10
minutes since a PI test takes 10 minutes. However, you may adjust the
test time so that the test continues after the 10-minute duration by using
the ‘Timer Adjust‘ keys as above. The ‘Timer On’ indicator will light.
Press the ‘Test Start / Stop’ button for at least one second to start the