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Summary of Contents for Megger MIT1020/2
- Page 1 (217) 352-9330 | Click HERE Find the Megger MIT1020/2 at our website:...
- Page 2 MIT1020/2 10kV Digital Insulation Tester USER MANUAL...
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Page 3: Safety Warnings
SAFETY WARNINGS Safety Warning must be observed during use. The circuit under test must be switched off, de-energised, isolated and checked to be safe before insulation test connections are made. Make sure the circuit is not re-energised whilst the instrument is connected. Circuit connections must not be touched during an insulation test. -
Page 4: Table Of Contents
CONTENTS Safety warnings Test mode summary Introduction Insulation resistance ‘IR’ test General description Breakdown mode / burn mode Features Alarm limit mode Cleaning Step voltage ‘SV’ test Power lead and battery charging Polarisation index ‘PI’ test, and dielectric absorption Instrument controls and indicators ratio ‘DAR’... -
Page 5: Introduction
The dielectric absorption ratio is automatically calculated if the The MIT1020/2 can be powered from the mains supply or by its own corresponding timers are set. internal rechargeable battery, which provides for at least 4 hours of Either burn or breakdown selectable in insulation resistance mode. -
Page 6: Power Lead And Battery Charging
POWER LEAD AND BATTERY CHARGING If the power lead supplied is not suitable for your mains connection, do not use an adaptor. Always use a power lead fitted with the correct plug. The instrument is fitted with a two-pin IEC60320 power inlet. Most power leads are made with three-core cable, so the ground connection will not be used. -
Page 7: Instrument Controls And Indicators
INSTRUMENT CONTROLS AND INDICATORS Line RS232 Measurement terminals Voltage at Test modes Burn indicator Alarm Data recording input guard terminals Time s and Battery level Timers t selectors Main, T1, Voltage s Line input t selectors Present Breakdown Analogue indicator indicator display Power on/off... -
Page 8: Power On/Off Button
Power On/Off button When the test has stopped, the display continues to show the voltage The instrument will only turn on if this button is pressed, held and then present on the test leads. Pressing either test voltage s or t button will released when the display responds. - Page 9 In the ‘IR’, ‘PI’, and ‘DD’ modes the secondary display initially shows the PI (polarity index), DAR (dielectric absorption ratio), and, on completion of the test, the TC (time constant) and capacitance measurements. Toggling the display shows insulation resistances and currents. In the ‘SV’...
- Page 10 Press Ω/I Press Ω/I Press Ω/I Press Ω/I Press Ω/I Press Ω/I Figure 2 - The result of a polarity index test (PI) Figure 3 - The result of a dielectric discharge test (DD) Test settings: T1 and T2 times set in order to measure the DAR Test settings: T1 and T2 times set in order to measure the DAR Test conditions: timer defaults to 10 minutes, as this is required for a PI Test condition: test runs for longer than 10 minutes as this is required for...
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Page 11: B Button
Button Press Function Comment Fn + Vs Increment in 10 V steps Voltage range between 50 and 1000 V Fn + Vt Decrement in 10 V steps Voltage range between 50 and 1000 V Fn + Vs Increment in 25 V steps Voltage range between 1000 and 10000 V Fn + Vt... -
Page 12: Timer S And T Buttons
Switch the instrument on and wait until initialisation is complete. Hold Megger Limited cannot accept responsibility for any losses of data. Regular down the function key and press the record key twice. The instrument now downloading to a PC using software such as Download Manager will displays ‘clr’... -
Page 13: Recording To A Pc
Recording to a PC terminal i.e. if the insulator is clean and there are unlikely to be any adverse While carrying out a test, the instrument will output the test voltage, current paths. However in cable testing for example, there may be surface leakage paths across the insulation between the bare cable and the external test current and resistance every second. -
Page 14: Battery Bar Graph
Installation instructions are also to be found on the CD. this will be displayed regardless of changes made to the test voltage. In Programmes such as Megger Download Manager may be used to download the results stored in memory. Programmes such as Microsoft ®... -
Page 15: Analogue Display
Analogue display ‘Pre-Test / During test’ Key action table. This simulates an analogue meter movement to give the user a better “feel” for how a measurement is progressing. The analogue display shows Button press Key action Fn + Key action resistance only. -
Page 16: Breakdown Detection
The noise current is either picked up by test leads or induced directly In certain rare circumstances in the item under test. The MIT510/2, MIT520/2 and MIT1020/2 are all breakdown of the circuit under test capable of accurate measurements with up to 2mA of induced noise may interfere with the sensitive current current. -
Page 17: Test Mode Summary
TEST MODE SUMMARY Press the ‘MODE’ button to cycle through and select the test mode. ‘10m’. Modes of test to be chosen from include an insulation resistance ‘IR’ Pressing the ‘Ω/I’ button toggles the display to show the insulation test, a polarization index ‘PI’ test, a step voltage ‘SV’ test, and a dielectric resistances, insulation currents, DAR and PI ratios, and capacitance. -
Page 18: Step Voltage 'Sv' Test
the ‘A ’ symbol is flashing on the display. Use the timer s and t buttons minute period. Readings for contaminated insulation are fairly constant to set the resistance threshold between the limits of 10 kΩ and 35 TΩ. because any absorption effects are masked by high leakage currents. -
Page 19: Measurements Above 100 Gω
Measurements above 100 GΩ a high value with a relatively short time constant of a few seconds. The Measurements up to 100 GΩ can be made without any special precautions, other current component, comprising the released absorption current, assuming that the test leads are reasonably clean and dry. The guard lead decays from a lower value with a relatively long time constant of up to can be used to remove the effects of surface leakage if necessary. -
Page 20: Circuit Block Diagram
For 5 kV instruments C1 = 47 nF, R1 = 50 kΩ, R2 = 40 kΩ Megger. The lead to the negative terminal is fully screened. The screen is plugged into the Guard terminal, diverting any stray leakage currents. This For 10 kV instruments C1 = 15 nF, R1 = 156 kΩ, R2 = 110 kΩ... -
Page 21: Specifications
The PI, DAR, capacitance, time constant <250 ms per µF to discharge from 10 kV to 50 V and DD values are also stored if available at the end of the test. Megger Download Manager may be used to transfer this data to a PC. -
Page 22: Accessories
Meets the requirements of IEC61326-1 3 x 3 m lead set with large insulated clips 1002-534 Operating temperature Optional Accessories Refer to www.megger.com HV test lead sets Operating temperature 3 x 3 m with un-insulated small clips 8101-181 -20 °C to 50 °C... -
Page 23: Repair And Warranty
Fax: +1 610 676 8625 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 in-service care for your Megger products. -
Page 24: Battery Replacement
WEEE The crossed out wheeled bin placed on the Megger products is a reminder not to dispose of the product at the end of it’s product life with general waste. Megger is registered in the UK as a Producer of Electrical and Electronic Equipment. - Page 25 F +41 62 768 20 33 F +91 22 26740465 Megger products are distributed in 146 countries worldwide. This instrument is manufactured in the United Kingdom. The company reserves the right to change the specification or design without prior notice.
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