Megger MEG10-01 Bedienungsanleitung

MEG10-01

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.

NOTE

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

Symbols used on the instrument are:

FCaution: risk of electric shock

GCaution: refer to accompanying notes

tEquipment protected throughout by Double

Insulation (Class II)

cEquipment complies with current EU directives.

CONTENTS

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

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 GΩon the digital display and to

1 TΩon 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

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

INSTRUMENT CONTROLS AND INDICATORS

Line Input

(under cover)

RS232 port

(under cover)

Polarisation Index/

Insulation Resistance Power

On/Off

LED

Red - HT On

Green - Charging Battery

Test

Start/Stop

Display

Scroll

Test Voltage

increase/

decrease

Test Duration

increase/

decrease

Measurement Terminals

-ve, Guard, +ve

Polarisation Index/

Insulation Resistance

Voltage

Indicator

Voltage at

Terminals Voltage at

Terminals

Digital Display

Recording Timer ON

Time

Indicator

Analogue

Display

On / Off Button.

Pressing the On / Off button powers up the MEG10-01 and initiates a

self-check and calibration routine. All LCD segments appear for 5

seconds, then the word ‘CAL’ appears for approximately 5 seconds.

When the word ‘CAL’ disappears the instrument is ready for use and is

in ‘Test Setup’ mode. To manually power down the MEG10-01, press

the On / Off button once more. (If no activity is detected for 10

minutes the MEG10-01 will automatically power down.)

If the MEG10-01 is switched off while connected to a supply of between

100 and 240 V 50/60 Hz it will automatically invoke charging mode and

the internal batteries will be recharged. It is not possible to use the

instrument and to charge the batteries at the same time.

PI / IR

This button has several uses. It is used to select a Polarisation Index test

or a normal Insulation Resistance test. It is also used to clear stored

results from on board memory. See “Deleting Test Results” later in

this manual. It is also used when downloading stored data from the

MEG10-01. See “Downloading Results” later in this manual.

If PI is selected the ‘PI Test’ indicator will illuminate. The test will carry

out the internationally accepted PI test whereby the insulation resistance

reading 10 minutes into the test is divided by the insulation resistance

reading at 1 minute. Unless specified otherwise the test will then stop

and display the relevant parameters. (But see “Time Adjust” below).

The test voltage is selected as described in “Voltage Adjust” below.

If IR is selected, the ‘PI Test’ indicator will not illuminate and the test

will be controlled by the parameters set under ‘Voltage Adjust’ and

‘Time Adjust’ as described below.

Voltage Adjust

The ‘Voltage Adjust’ buttons are used to increase or decrease the test

voltage before starting a test or during a test if so desired. There are

five values available: - 500 V, 1000 V, 2500 V, 5000 V and 10000 V.

Prior to starting a test the selected value is displayed in the ‘Voltage

Indicator’ section of the LCD display. During a test this section of the

display will show the actual test voltage measured at the instrument

terminals.

Pressing the up or down button during a test will increase or decrease

the test voltage respectively to the next available voltage. After a few

seconds the display will revert to displaying the new actual test voltage.

When a test has been completed, briefly pressing one of these buttons

will cause the display to revert to its ‘Test Setup’ mode where the test

parameters may be set.

Timer Adjust

The ‘Timer Adjust’ buttons are used to set or to cancel the automatic

timer function. A test duration may be set from 00 minutes 01 seconds

up to 99 minutes 59 seconds in 1 second intervals. Use the ‘Timer

Adjust’ buttons to set the test duration to the desired value, which will

be displayed in the ‘Time Indicator’ section of the LCD display and will

also turn the ‘Timer On’ indicator on. During a test, the ‘Time

Indicator’ will count the elapsed time, up to 99 minutes 59 seconds.

The timer can be quickly set to its minimum value during setup by

pressing both up and down keys together. If a PI test has been selected

then this minimum is 10:00. For an IR test the value is 00:00 and is the

means of switching off the automatic timer function and the ‘Timer On’

indicator will be cancelled. In this condition a test will continue

indefinitely until the ‘Test’ button is pressed to terminate the test or, if

Display Button

This button has several functions depending upon what the MEG10-01 is

doing when the button is pressed.

With the instrument turned on and running a test, briefly pressing the

‘Display Button’ will toggle the display between showing the measured

insulation resistance as a resistance and showing it as a leakage current.

With the instrument displaying the results of a completed test, pressing

the ‘Display Button’ briefly will cause the displayed measurement to

cycle round its measured values. If the test was a simple IR test this will

simply toggle the final insulation resistance reading between resistance

and current display modes. If the test was a PI test this will cycle round

1 minute resistance, 1 minute current, 10 minute resistance, 10 minute

current, PI value and, if the duration exceeded 10 minutes, the final

resistance and final current.

The ‘Display Button’ is also used to start and stop recording mode. For

more details see the section “Recording Data’” later in this manual.

The ‘Display Button’ is also used when downloading stored result and to

deleting stored data. More details are available under “Downloading

Results” and “Deleting Test Results” later in this manual.

Test Terminals

The MEG10-01 has three test terminal marked ‘+’, ‘-‘, and ‘G’. These

terminals are designed to accept safety leads and have shutters across

them to prevent accidental ingress of material into the sockets. These

shutters may be used to ‘lock’ the leads into place by inserting the lead

termination and rotating it until the leads are held by the shutters. They

may be unlocked by turning the lead termination by a quarter

revolution.

being used under battery power, until battery power is exhausted. The

elapsed time will be displayed up to 99 min 59 sec.

If a PI test has been requested the ‘PI Test’ indicator will illuminate and

the ‘Time Indicator’ will default to 10:00. If you wish the test to

continue beyond the 10-minute duration, set the ‘Time Indicator’ to the

desired value. The measured insulation resistances at 1 minute and 10

minutes will be captured as well as the final values at the end of the

selected test duration. Similarly, if a PI test is selected, you may turn off

the automatic timer function and stop the test manually. The 1 minute

and 10 minute values will be captured if the test is allowed to run for 10

minutes or more as well as the final values. Please note that if a PI test

is selected ‘Time Indicator’ settings between 00:01 and 09:59 are not

allowed.

Pressing both buttons simultaneously during a test will cause the

selected test duration to be displayed for 3 seconds, after which the

timer will revert to displaying the elapsed time.

At the end of a test, briefly pressing one of these buttons will cause the

display to revert to its ‘Test Setup’ mode where the test parameters may

be set.

Test Button

Pressing the ‘Test’ button for more than one second will start a test

using the preselected parameters and will start the ‘Time Indicator’ if

its use has been activated. The actual test start is indicated by the ‘HV

On’ l.e.d. flashing red and the ‘High Voltage Warning’ symbols

flashing.

Pressing the ‘Test’ button a second time will stop the test and discharge

the item under test to a safe level.

modem lead supplied. Please note that the resulting file could be quite

large if a long test duration is used. Make sure sufficient hard disk

space is available on your PC. As an example, capturing the output

over a period of 1 minute will require approximately 2.4 kb of hard disk

space.

Downloading Results

Connect your MEG10-01 to the RS232 port of a PC running Download

Manager, using the null modem cable supplied. Start Download

Manager on your PC, select MEG10-01 driver and right click the icon.

Select ‘Download’.

Switch the instrument on and wait until the calibration procedure is

complete. Press and hold the PI button for 3 seconds until the display

shows ‘dld’. Press and hold the TEST button and the stored results will

be sent to the PC.

Results will not be erased during this operation and so may be

downloaded repeatedly.

Deleting Test Results

Switch the MEG10-01 on. Wait until the calibration procedure is

complete. Press and hold the PI button for 3 seconds until the display

shows ‘dld’. Press the Display Button to change the display to ‘clr’.

Press and hold the TEST button and ALL stored results will be deleted.

Press the PI button before pressing the TEST button if you do not want

to delete the results.

HV ON led

This led, situated on the front panel, flashes red to indicate the presence

of a dangerous voltage at the instrument terminals. This voltage may be

generated internally by the instrument (the test voltage), or may arise

from external sources such as discharging a charged test sample or a live

RS232 socket

The RS232 socket is the 9 pin D plug located under the hinged cover on

the right hand side of the front panel.

This socket is used to download stored data and to output data at 1

second intervals during a test. The data format is 9600 baud, 8 bits, 1

stop bit, No parity.

Recording to on board memory

To switch the instrument into Recording mode, press and hold the

Display key before starting a test. The ‘Recording Indicator{‘ will light

once record mode has started. The instrument will remain in recording

mode until the Display button is held for 3 seconds or the instrument is

powered down.

When recording to memory the results will be recorded at the following

intervals: - 15s, 30s, 45s, 60s, 1m, 2m, 3m, 4m, 5m, 6m, 7m, 8m, 9m,

10m, and thereafter every 5 minutes until the end of test. The final

values will also be recorded as will the PI value if relevant. At each

interval the recorded data will contain the elapsed test time, selected test

voltage, actual test voltage, leakage current and resistance.

It is also possible to press and hold the ‘Display Button’ during a test.

This will cause the record mode to be turned on or off as appropriate

but it must be remembered that the changed state will only take effect

from the time the mode has been changed.

Please note that the number of tests that can be stored will depend on

the test duration, but typically 30 tests may be stored.

Recording to a PC

While carrying out a test, your MEG10-01 will output the test voltage,

test current and resistance every second. This information may be

captured by connecting a PC running Download Manager using the null

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