Megger MIT200 Series - Insulation And Continuity Tester Manual

Precautions

These must be read and understood before the instrument is used. They must be observed during use.

• The circuit under test must be switched off, de-energised and isolated before test connections are made when carrying out insulation and continuity tests.
• Circuit connections and exposed metalwork of an installation or equipment under test must not be touched. Remember remote conductors may be charged to the test voltage.
• The live circuit warning and automatic discharge are additional safety features which may fail and therefore safe working procedures/practices must be observed.
• The voltage function will only work if the instrument is functional and switched on.
• After insulation tests, capacitive circuits must be allowed to discharge before disconnecting test leads.
• The instrument, test-leads, probes and crocodile clips must be in good order, clean and with no broken or cracked insulation.
• Ensure that hands remain behind guards of probes/clips when testing.
• National Safety Authorities may recommend the use of fused test leads when measuring voltage on high-energy systems.
• Replacement fuses must be of the correct type and rating. to observe this will result in a safety hazard.
• The rear cover must be in place whilst conducting tests.

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

Users of this equipment and/or their employers are reminded that National Health and Safety Legislation requires them to carry out valid risk assessments of all electrical work so as to identify potential sources of electrical danger and risk of electrical injury such as inadvertent short circuits. Where the assessments show that the risk is significant then the use of fused test leads may be appropriate.

Symbols used on the instrument:

• 
  Caution: refer to accompanying notes
• 
  Equipment protected throughout by Double Insulation (Class II)
• 
  Equipment complies with relevant EU Directives
• 
  Equipment complies with 'C tick' requirements
• 
  Do not dispose of in the normal waste stream
• 
  Maximum input voltage 600 V rms

Application

BS EN 61010 defines measurement categories from I to IV relating transient over voltages and the location within the electrical installation. This instrument is designed for use at Category III (Building installation/distribution board level) up to 600 V (maximum) rms to earth and 600 V (maximum) rms between terminals. It may also be used at Category IV (Primary supply level) on 300 V rms phase to earth systems.

Display layout

Operation

All circuits must be isolated before an insulation or continuity test.

Automatic Voltage detection

The instrument will automatically display voltage between 25 V and 600 Vac or dc when connected to the circuit under test.
Remove the source of any voltage before continuing to test.

Test lead check

1. Before each use of the instrument, inspect the test leads, prods andcrocodile clips to confirm that their condition is good, with no damaged or broken insulation.
2. Check continuity of the test leads by firmly shorting the leads together andread the test lead resistance measurement directly from the display.

Backlight operation

1. Turn the instrument backlight on by selecting the position. Backlight stays on for 1 minute.
2. When the backlight is activated, select the desired test position.
3. Change range or press [TEST] to re-initialise backlight for another minute.

Test lead null

To remove test lead resistance before continuity tests:

1. Switch the instrument to [Ω]
2. Short test leads together, wait for a stable reading and press the test buttonon the instrument. The display should read 0.00 Ω and display the [] symbol.

Lead null value is automatically stored until reset.

To remove, press the TEST button again with leads open circuit.

Continuity Measurement [Ω]

1. Set range switch to [Ω].
2. Connect the red and black test leads to the circuit to be tested. Theinstrument will automatically display continuity resistance when connected (up to 99.9 Ω).

NOTE:
If ">100.0 Ω " is displayed the resistance of the circuit is over-range.

Continuity Buzzer

[]

1. Set the instrument to [ ] range.
2. Connect the test leads to the circuit to be tested.
3. The buzzer will sound automatically when a circuit is made (<5Ω)
4. If a circuit voltage >2 V is detected the test will be inhibited.

Insulation testing [ MΩ ] all instruments

1. Set range switch to [250 V], [500 V] or [1 kV] as available.
2. Press and hold down the TEST button to start test. The display will settle, and show the insulation test resistance in MΩ.
3. If a circuit voltage of >25 V is detected the instrument will give a warningBeep but allow testing to continue.

If a circuit voltage >50 V is detected, further testing will be prevented.

After testing ensure the display returns to Zero (circuit is discharged) before removing test leads.

Error messages:
>100.0 Ω Continuity over-range
<0.01 M Ω Insulation test result is under-range
>1000 M Ω Insulation test result is over-range
UNC Uncalibrated
E17 Instrument not configured to a specific type.

Battery replacement

Low battery voltage is indicated by the symbol in the display. To maintain performance the batteries should be replaced at this point.
Uses 6 x 1.5 V AA (LR6) alkaline dry cells or NiMH rechargeable batteries.
To replace batteries switch off instrument and disconnect test leads from the circuit under test.
Remove the rear battery cover and replace the batteries. Do not mix old and new batteries.

OBSERVE CORRECT POLARITY. Incorrect battery polarity could cause batteries to leak and damage the instrument.

Fuse replacement

A blown fuse is indicated by the symbol f in the display.

To replace the fuse remove battery cover and replace fuse with type: 500 mA (F) HBC 50 kA 600 V.

Cleaning:
Wipe disconnected instrument with a clean cloth dampened with soapy water or Isopropyl Alcohol (IPA).

Specification

Safety

Meets the requirements of BS EN61010-1, Cat III 600 V phase to earth. Refer to safety warnings supplied.

Automatic discharge

After an insulation test, the circuit under test will be discharged automatically. Any voltage present will be indicated on the display so that the discharge can be monitored.

EMC
In accordance with IEC 61326 including amendment No.1

Included accessories

• Test lead set (red and black) with crocodile clips 6220-779
• Hard carry case 5410-346

Optional accessories

• 2 wire fused probe and clip set 6220-787
• Rubber holster (Boot) 5410-346

Repair and Warranty

The instrument contains static sensitive devices, and care must be taken in handling the printed circuit board. If an instrument's protection has been impaired it should not be used, but sent for repair by suitably trained and qualified personnel. The protection is likely to be impaired if for example, it shows visible damage, fails to perform the intended measurements, has been subjected to prolonged storage under unfavourable conditions, or has been subjected to severe transport stresses.

NEW INSTRUMENTS ARE GUARANTEED FOR 3 YEARS FROM THE DATE OF PURCHASE BY THE USER.

Note:
Any unauthorized prior repair or adjustment will automatically invalidate the Warranty.

CALIBRATION, REPAIR AND SPARE PARTS

For service requirements for Megger Instruments contact:

Megger operate fully traceable calibration and repair facilities, ensuring your instrument continues to provide the high standard of performance and workmanship you expect. These facilities are complemented by a worldwide network of approved repair and calibration companies to offer excellent inservice care for your Megger products.

Returning your product to Megger - UK and USA service centres

1. When an instrument requires recalibration, or in the event of a repair beingnecessary, a Returns Authorisation (RA) number must first be obtained from one of the addresses shown above. You will be asked to provide the following information to enable the Service Department to prepare in advance for receipt of your instrument, and to provide the best possible service to you.

• Model, e.g. MIT200.
• Serial number, to be found on the underside of the case or on the calibration certificate (e.g. 6111-357/050305/1234)
• Reason for return, e.g. calibration required, or repair.
• Details of the fault if the instrument is to be repaired.

2. Make a note of the RA number. A returns label can be emailed or faxed to you if you wish.
3. Pack the instrument carefully to prevent damage in transit.
4. Ensure the returns label is attached, or that the RA number is clearlymarked on the outside of the package and on any correspondence, before sending the instrument, freight paid, to Megger. Copies of the original purchase invoice and packing note should be sent simultaneously by airmail to expedite clearance through customs. In the case of instruments requiring repair outside the warranty period, an immediate quotation can be provided when obtaining the RA number.
5. You may track the progress of your return on line at www.megger.com

Approved Service Centres

A list of Approved Service Centres may be obtained from the UK address above, or from Megger's website at www.megger.com

Megger Limited
Archcliffe Road, Dover
Kent CT17 9EN England
T +44 (0)1 304 502101
F +44 (0)1 304 207342
E uksales@megger.com

Megger
4271 Bronze Way, Dallas,
Texas 75237-1019 USA
T +1 800 723 2861 (USA ONLY)
T +1 214 333 3201
F +1 214 331 7399
E ussales@megger.com

Megger
Z.A. Du Buisson de la Couldre
23 rue Eugène Henaff
78190 TRAPPES France
T +33 (0)1 30.16.08.90
F +33 (0)1 34.61.23.77
E infos@megger.com

Megger Pty Limited
Unit 26 9 Hudson Avenue
Castle Hill
Sydney NSW 2125 Australia
T +61 (0)2 9659 2005
F +61 (0)2 9659 2201
E ausales@megger.com

Megger Limited
110 Milner Avenue Unit 1
Scarborough Ontario M1S 3R2
Canada
T +1 416 298 9688 (Canada only)
T +1 416 298 6770

This instrument is manufactured in the United Kingdom.

The company reserves the right to change the specification or design without prior notice.

Megger is a registered trademark

www.megger.com

Documents / Resources

References

• Electrical test equipment | power station to plug | Megger

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