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Summary of Contents for Megger BM11D
- Page 1 5kV Digital Insulation Testers ® MEGGER BM11D ® MEGGER BM21 MEGGER ® User Guide Guide de l’utilisateur Gebrauchsanleitung Guía del usuario...
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Page 2: Table Of Contents
Contents Safety Warnings Accessories General Description Repair and Warranty Features and Controls 5 - 6 Guide Utilisateur 22 - 37 Operation Betriebsanleitung 38 - 53 Instrument Controls 7 - 8 Guîa del Usuario 54 - 69 Features Testing Procedures Battery 9 - 10 Guard Terminal 10 -11... -
Page 3: Safety Warnings
SAFETY WARNINGS • 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 insulation tests, capacitive circuits must be discharged before disconnecting the test leads. •... -
Page 4: General Description
1 TΩ. The BM11D has a digital full scale of 500 GΩ whilst the BM21 can measure up to 5 TΩ. The... -
Page 5: Features And Controls
Features and Controls Sliding Cover (open) 12 V Charger Input Mains Socket Fuse FS2 Fuse FS1 Terminal Voltage Cursor Warnings Cursor Battery Symbol Timer Selector Keys HV Warning LED Test Button On / Off Button BM11D Front Panel Layout... - Page 6 Sliding Cover (closed) Warnings Terminal Voltage Timer Battery Symbol Cursor HV Warning LED Range Keys Selector Keys Test Button On / Off Button BM21 Front Panel Layout...
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Page 7: Operation
Operation INSTRUMENT CONTROLS indicated on the display. If the current flowing into the terminals exceeds 2 mA it will not be possible to start a test. On/Off Button. Pressing the On/Off button starts the instrument and initiates a A test may be terminated if; self check and calibration. -
Page 8: Features
‘R’, ‘I’ or ‘BURN’) cannot be changed. The measurement range Timer must therefore be selected before the variable voltage position BM11D:The timer automatically starts when the test button is is chosen. pressed. It indicates the time elapsed. Maximum test duration is To select the test voltage required, move the cursor to the 60 minutes, when the test will be stopped automatically. -
Page 9: Testing Procedures
Operation TESTING PROCEDURES run for more than one minute, and provided the reading was not over-range. When not testing, i.e. when in standby mode, the instrument acts as a voltmeter. Reading Limitations The BM11/D can measure currents down to 10 nA. The Select the required test voltage with the selector keys. -
Page 10: Guard Terminal
about 5 years; less if subjected to high temperatures for much range 0 °C to 40°C. of the working day. To reduce the chances of sudden failure, GUARD TERMINAL two batteries are used, operating in parallel. If either battery The guard terminal is at the same voltage as the negative fails, the instrument will continue to operate on the good battery terminal. -
Page 11: Condition And Warning Indicators
‘BURN’ mode. When using perhaps due to the presence of moisture or dirt. Where it is the BM11D (or BM21 in ‘BURN’ mode) testing will continue if required to remove the effect of this leakage, particularly at high a breakdown occurs in the circuit under test. - Page 12 adjusts the measurement system against an internal voltage and resistor. The calibration sequence will not finish unless the measurement system is giving consistent results within preset limits. If the startup screen does not progress beyond the segment check or stops with ‘CAL’ displayed, calibration has failed.
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Page 13: Application Notes
Application Notes Preventive Maintenance The proverb ‘A stitch in time saves nine’ inspired the title of an AVO International booklet on insulation testing, as it neatly sums up the benefits of preventative maintenance. The savings come in financial terms from costly repairs, lost production, lost profits and in human terms, from lives saved in the event of dangerous electrical faults. -
Page 14: Insulation Testing Techniques
Insulation Testing Concepts Conduction or Leakage current.This is a small steady Insulation resistance can be considered by applying Ohm’s Law. current that can be sub-divided into two:- The measured resistance is determined from the applied voltage (a) A current flowing along conduction paths through divided by the resultant current, the insulation material. -
Page 15: Short Time Or Spot Test
Application Notes Short time or Spot Test With contaminated insulation, absorption effects are masked by This is the simplest insulation test, giving a reading of insulation high leakage currents and the readings are therefore fairly flat. resistance in MΩ. The test is applied for a short but specific The PI test takes the ratio of the values at 10 and 1 minutes - period of time, immediately after which a reading is taken. -
Page 16: Stress Conditions
Stress Considerations Figure 3. shows a problem which can occur. If one end of the Measurement above 100 GΩ sample is grounded and this is required to be connected to the Figure 1. shows the stresses and subsequent leakages positive terminal, then the negative (measurement) lead is which will occur between the test leads if neither is surrounded by a 5 kV field. -
Page 17: Specification
Accuracy (0 °C to + 30 °C): ±5% of nominal test voltages (load resistance >100 MΩ) Insulation Range: 100 kΩ to 1 TΩ analogue BM11D: 10 kΩ to 500 GΩ digital BM21: 10 kΩ to 5 TΩ digital Accuracy (0 °C to + 30 °C): BM11D: ±5%... - Page 18 Typical Terminal Voltage Characteristics...
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Page 19: Specification
Hum Rejection: 1 mA rms per kV test voltage 2 mA rms maximum Voltage range: BM11D: 50 to 1000 V a.c. or d.c. BM21: 50 to1000 V a.c. or d.c. (N.B. Display does not distinguish between V a.c. and V d.c.) Accuracy (0 °C to +30 °C):... -
Page 20: Accessories
Supplied with the instrument Part Number Cat. Number (US only) User Guide 6172-033 HV lead set, 3 m long 6121-403 Set of 3 High voltage test leads, 3 m long (210968) Accessory Pouch 6420-096 Mains (line) power cord Available as an optional extra HV lead set, 8 m long (x3) 6121-451 HV lead set, 15 m long (x3) -
Page 21: Repair And Warranty
A number of independent instrument repair companies have protection of an instrument has been impaired it should not be been approved for repair work on most MEGGER ® used, and be sent for repair by suitably trained and qualified instruments, using genuine MEGGER® spare parts. Consult personnel. -
Page 22: Guide Utilisateur
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 Trade Mark of AVO INTERNATIONAL LIMITED. Copyright © AVO INTERNATIONAL LIMITED. Part No. 6172-033 - Edition 8 - Printed in England - 6EE...
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Questions and answers
Our Megger BM11D is not switching ON, of course it was lying idle for well over 6 months, the FS1 and FS2 ohmic reading is 23.9 and 17 Ohms respectively
The Megger BM11D may not be switching on after being idle for over 6 months due to completely exhausted batteries. The manual states that when the batteries are fully depleted, the battery symbol will flash, and the instrument will switch off. Additionally, battery life is affected by high temperatures and long idle periods. It is recommended to keep the batteries in a fully charged state for maximum reliability. Charging the batteries or replacing them if necessary should resolve the issue.
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