Extech Instruments MG500 Manual de usuario

USER MANUAL

10KV Digital High Voltage Insulation Tester

Model MG500

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Introduction

Thank you for selecting the Extech Instruments Model MG500. This device is shipped fully tested

and calibrated and, with proper use, will provide years of reliable service. Please visit our website

(www.extech.com) to check for the latest version of this User Guide, Product Updates, and

Customer Support.

Safety

International Safety Symbols

This symbol, adjacent to another symbol or terminal, indicates the user must refer to the manual for

further information.

This symbol, adjacent to a terminal, indicates that, under normal use, hazardous voltages may be

present

Double insulation

CAUTION RISK OF ELECTRIC SHOCK

This tester has been designed with safety in mind. However, no design can completely protect

against incorrect use. Electrical circuits can be dangerous and lethal when a lack of caution and

poor safety practices are used.

Do not take field measurements on either power system grounding during periods of lightning

activity, or any non-insulated system or non-insulated circuit. In the event that lightning occurs,

stop all testing and isolate and remove any temporarily installed test spikes or test leads.

Preparations for testing power system grounding (or close to it) can leave personnel vulnerable to

exposure caused by faults at, or fed from, the system under test, transferred potentials from

remote test grounds, and inadvertent line energizing. Always insulate the device under test.

While the probability of such occurrences is low, personnel safety will, nevertheless, be

enhanced by the following:

When working near high tension systems rubber gloves and shoes should be worn. Work on

clean, dry crushed rock or an insulating blanket. Avoid bare hand-to-hand contact between

the tester and extended test leads.

When using the tester with test leads, ensure that they are safe and properly authorized.

Disconnect the tester from any external circuit when checking or changing the fuse and/or

batteries.

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CAUTION! READ THE MANUAL

Follow the instructions in the Manual for every measurement type. Read and understand the

general instructions before attempting to use this instrument.

SAFETY CHECK

Before using the tester check the condition of the test leads.

The test leads must be free of cracks or any damages and must be insulated.

Always disconnect the test leads when changing the batteries

Always double check the lead connections before making any measurements. For increased

safety, use fused test leads (optional).

Do not touch exposed wiring, connections or other "live" parts of an electrical circuit. If in doubt,

check the circuit first for voltage before touching it.

THIS INSTRUMENT SHOULD ONLY BE USED BY COMPETENT, SUITABLY TRAINED

PERSONNEL.

CAUTION! RISK OF ELECTRIC SHOCK

CAUTION! READ THE MANUAL

Electricity can cause severe injuries even with low voltage or current. It is extremely important that

the following information be read before using this High Voltage Digital Insulation Meter.

This instrument must only be used and operated by competent trained personnel and in strict

accordance with the instructions and safety practices. Liability is not accepted for any damage or

injury caused by misuse or non-compliance with instructions and safety procedures.

This instrument must not be used on live circuits. Ensure all circuits are de-energized before

testing.

Never open this High Voltage Digital Insulation Meter except for battery replacement (See

Battery Replacement section).

Always inspect this High Voltage Digital Insulation Meter and test leads before using for any

sign of abnormality or damage. If any abnormal conditions exist (broken test leads, cracked

case, display faulty etc...) do not attempt to take any measurement or use the tester. Return

the Meter for service.

This Variable High Voltage Digital Insulation Meter has a live circuit warning beeper. If it is

connected to a live circuit, a rapid pulsating tone will sound and a warning message will be

displayed. In this case, stop testing and immediately disconnect the instrument from the

circuit under test.

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Features

•Insulation Resistance Testing

This digital insulation resistance tester will measure insulation resistance from 800k ohms to

500G ohms using Dynamic Auto-ranging technology. Test voltages range from 500V to 10kV

in 500 Volt steps. This instrument also employs an Auto-Discharge utility.

•DAR: Dielectric Absorption Ratio Testing

The Dielectric Absorption is the ratio of the Insulation Resistance, measured at 60 seconds,

divided by the Insulation Resistance measured at 30 seconds).

DAR = Resistance measured at 1 minute / Resistance measured at 30 seconds

•PI: Polarization Index Testing

The Polarization Index is the ratio of the Insulation Resistance measured at 10 minutes

divided by the Insulation Resistance measured at 1 minute.

PI = Resistance measured at 10 minutes / Resistance measured at 1 minute

•Automatic Discharge of Capacitive and Inductive Circuits

This instrument will automatically discharge all circuits, charged by the tester, upon

completion of a test. The discharge can be observed on the instrument’s bargraph display.

•Automatic Battery Test

When the instrument is first powered ON, a test circuit applies a heavy current draw on the

batteries for a few seconds and measures the voltage in order to determine the capacity of

the batteries. The result is shown on the display.

•Normal Operation Mode Considerations

This instrument uses Dynamic Current Auto-ranging technology. The bar graph will

display the voltage that is stressing the insulation during the first 30 seconds of a test and

during the discharge of the circuits at the end of the test. The display will also show the

elapsed time from the start of the test and the total time, even after the testing has stopped.

•Supplemental Features

oInsulation Resistance auto-ranging on all Voltage ranges

oAutomatic DAR calculation

oAutomatic PI calculation

oEner-Save™ Mode conserves battery energy during Insulation Resistance testing

oOverload protection

oLow battery indicator

oAuto Off feature

oWarning of external voltage presence (>500VAC or VDC)

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Description

1. Negative High Voltage (HV) Terminal

(Earth Ground)

2. Dot Matrix Display window

3. GUARD connection Terminal

4. Positive High Voltage Line Terminal

5. 10KV test voltage preset button

6. Power OFF button

7. Voltage adjustment button (-)

8. 5KV test voltage preset button

9. TEST START/STOP button

10. 2.5KV test voltage preset button

11. 500V test voltage adjust button (+)

12. Power ON button

13. 1KV test voltage preset button

Note: Battery compartment located on bottom of instrument and test lead compartment

located behind the upper faceplate.

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Meter Preparation

Warning: Ensure that the circuit under test does not include devices or components that can be

damaged by 10KVDC; such devices include power factor correction capacitors, low voltage mineral

insulated cables, electronic light dimmers, ballasts and starters for fluorescent lamps.

Connecting the Test Leads to the meter

oConnect the Red (Line) test lead to the Red test jack on the meter.

oConnect the blue lead (attached to the Red test lead) to the Blue test jack on the meter.

oConnect the Green (Earth) test lead to the Green test jack on the meter.

Optional Leakage guard

Connect the optional Blue (Leakage guard), test lead to the Blue test jack.

NOTE: The Blue (Leakage guard)lead is attached directly to the top of the Blue guard lead of the

Red test lead.

Connecting the Test Leads to the device under test

Warning: make sure that the circuit under test is de-energized.

oConnect the Green (Earth) lead to the Earth or ground side of the insulator under Test.

oConnect the Red (Line) test lead to the other side of the Insulator under test.

oOptional Leakage guard: Connect the Blue (Guard) lead to the insulator sheathing and

covering material as shown on the diagram. Use a copper wire wrapped around the

insulator at about its center.

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Operation

Powering the meter

Press the ON button to turn the unit on. Press the OFF button to turn the unit off. If the meter

does not switch ON please check that fresh ‘C’ 1.5V alkaline batteries are installed in the battery

compartment located at the bottom of the instrument.

Insulation Resistance Testing Procedure

Warning: The circuit under test must be completely de-energized and isolated before making

test connections.

1. After turning the unit on, make sure that the Replace Battery message is not displayed. If

the Replace Battery message is displayed replace the batteries before proceeding.

2. The test voltage defaults to 2500V on power up. Select the desired test voltage using the

Voltage Adjust buttons (±500V) that step through the available test voltages in 500V

increments or by pressing one of the preset test voltage buttons (10kV, 5kV, 2.5kV, 1Kv).

3. The display shows the Connect Leads prompt along with the selected test voltage value.

Connect the Green test lead to the Green test socket on the meter and then to the Ground

side of the insulator under test.

Connect the Red lead to the Red test socket on the meter and the Blue guard cable to the

blue socket on the meter. Connect the service end of the Red cable to other side of the

insulator under test.

If a Leakage Guard lead is required to collect surface leakage, connect the separate Blue test

lead into the Blue guard lead from the Red test lead which is plugged into the Blue test

socket on the meter and then clip the service end of the cable to the surface of the insulator

under test.

4. Momentarily Press the TEST START/STOP button (1.5s 〜3 seconds) to start testing.

For DAR or PI testing – refer to the separate test procedure below.

5. The Insulation resistance test will complete in 5 seconds. The test voltage percentage

steadily counts down to zero during the test as can be seen on the display. The resistance

test result value will appear on the display when the test has completed.

6. The HOLD icon will appear in place of the bargraph when the test is complete and after the

voltage has been discharged.

WARNING: DO NOT REMOVE THE TEST LEADS BEFORE THE HOLD DISPLAY APPEARS.

7. The meter automatically discharges the system at the end of the test.

8. To take another test, press the TEST START/STOP button, the Connect Leads prompt should

appear on the display; the instrument is now ready to run a new test.

9. The instrument automatically powers down after 5 minutes of inactivity.

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The EnersaveTM Mode

EnersaveTM mode conserves battery life by performing a relatively short test. The EnersaveTM

mode is the default test mode. To bypass this mode and run a longer test (10 minutes) press and

hold the TEST button for more than 3 seconds when starting a test.

DAR and PI Tests (DAR: Dielectric Absorption Ratio) and (PI: Polarization Index)

Warning: The circuit under test must be completely de-energized and isolated before making

test connections.

1. After turning the unit on, make sure that the Replace Battery message is not displayed. If

the Replace Battery message is displayed replace the batteries before proceeding.

2. The test voltage defaults to 2500V on power up. Select the desired test voltage using the

Voltage Adjust buttons (±500V) that step through the available test voltages in 500V

increments or by pressing one of the preset test voltage buttons (10kV, 5kV, 2.5kV, 1Kv).

3. The display shows the Connect Leads prompt along with the selected test voltage value.

Connect the Green test lead to the Green test socket on the meter and then to the Ground

side of the insulator under test.

Connect the Red lead to the Red test socket on the meter and the Blue guard cable to the

blue socket on the meter. Connect the service end of the Red cable to other side of the

insulator under test.

If a Leakage Guard lead is required to collect surface leakage, connect the separate Blue test

lead into the Blue guard lead from the Red test lead which is plugged into the Blue test

socket on the meter and then clip the service end of the cable to the surface of the

insulator under test.

4. Press and hold the Test Start/Stop button for more than 3 seconds to the initiate DAR/PI

testing mode.

5. After 1 minute, the elapsed test timer appears on the upper line (right hand side) of the

display. The resistance reading is shown on the upper left hand side of the display. The lower

line shows the test voltage and the DAR value.

6. After 10 minutes, the test completes. The display will show the results:

R= (resistance or OVER R for over range)

T= Hold, T = 10:00, V = (test voltage)

PI = (PI value)

DAR = (DAR value)

7. To take another test, press the TEST START/STOP button, the Connect Leads prompt should

appear on the display; the instrument is now ready to run a new test.

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Bargraph Voltage Display

The bargraph represents the voltage present on the test leads as it rises, soaks, and decays. The

bargraph appears on the lower left of the display window during a test.

Automatic Under/Over Range Resistance Detect

If the display shows the message “LOW M-ohms”, the test should be interrupted immediately by

pressing the TEST button. This message indicates that the insulation under test has broken down

and the meter is trying to inject a high potential onto a short circuit. If ‘HIGH’ appears, it is likely

that the test configuration is open. Check the test set-up and then test again.

Elapsed Timer

The test duration is indicated on the display. This is particularly useful in determining whether an

insulating material under test will break down in a given amount of time.

Manual Test STOP

To stop a test in progress, press the TEST button. The test will immediately end and the system

will automatically discharge.

Automatic Test STOP

When in the default EnersaveTM mode, the test automatically stops in 5 seconds. When not in

the EnersaveTM mode the test automatically stops after approx. 10 minutes.

Live Circuit Warning

If the test leads are connected to a live circuit (approx. 500V), a warning beeper will sound and

the meter will display “Live Warning…Circuit Live…” In this case, correct the problem and retest.

Automatic Discharge

At the end of a test, the meter automatically discharges the high voltage. The automatic

discharge status is reflected on the display. During discharge the beeper will sound and, when

completely discharged, the HOLD icon will appear on the display.

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Application-Specific Information

Measuring Power Tools and Small Appliances

For small appliances, connect the GREEN (EARTH) lead to conductors and the RED (LINE) lead to

insulating material.

For single or double insulated power tools, one lead should be connected to the device’s chuck,

blade, etc. and the other lead to one of the AC power cord conductors (test both conductors in

turn). Refer to the power tool application diagram below.

AC Motor Test

Disconnect the motor from the line by:

a. Disconnecting the wires from the motor

terminals or,

b. Opening the main switch

If the main switch is opened, and the motor has a motor-starter, then the starter must be held in

the ON position. With the main switch opened, the measured resistance will include the

resistance of the motor wire and all of the other components between the motor and the main

switch. If a weakness is indicated, the motor and other components should be checked

individually. If the motor is disconnected at the motor terminals, connect the RED lead to the

grounded motor housing and the GREEN lead to one of the motor leads.

Plug

For 2 or 3 prong plugs, connect the

RED lead to one conductor at a time

Connect the GREEN

lead to the chuck

Connect RED lead

to grounded housing

Connect GREEN lead

to the motor leads

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