background image

 

38 

22. 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 Limited 

or 

Megger  

Archcliffe Road 

 

Valley Forge Corporate Centre 

Dover 

 

2621 Van Buren Avenue 

Kent CT17 9EN 

 

Norristown PA 19403 

England  

U.S.A. 

 
Tel: +44 (0) 1304 502 243 

 

Tel: +1 610 676 8579 

Fax: +44 (0) 1304 207342 

 

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 which offer excellent in-service 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 being necessary, a Returns 

Authorisation (RA) number must first be obtained from one of the addresses shown. 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. MIT400 

 

 

Serial number, (e.g. 61110357050305/1234) 

 

 

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 with plenty of padding, but no pressure on window or glass. 
 
4.  Ensure the returns label is attached, or that the RA number is clearly marked on the outside of the 

package and on any correspondence, before sending the instrument, carriage paid, to Megger.  

 
5.  You may track the progress of your return on line by accessing the Service/Support facilities at 

www.megger.com  

 

Approved Service Centres 

A list of Approved Service Centres may be obtained from the UK address shown. If outside UK/USA please 
consult your distributor for the most convenient Service Organisation.

 

www.

GlobalTestSupply

.com

Find Quality Products Online at:

[email protected]

Summary of Contents for MIT400 Series

Page 1: ...M MIT400 Series Insulation and continuity testers USER GUIDE www GlobalTestSupply com Find Quality Products Online at sales GlobalTestSupply com...

Page 2: ...nce measurements k Range 19 13 Capacitance measurements 20 Capacitance measurement procedure 20 Distance measurement by capacitance 20 14 Setup options 21 15 Saving recalling and downloading test resu...

Page 3: ...ting to use the instruments This user guide describes the operation and functions of the MIT400 series of insulation and continuity test instruments These instruments are designed and manufactured by...

Page 4: ...eads probes and crocodile clips must be in good order clean and with no broken or cracked insulation 8 Ensure that hands remain behind guards of probes clips when testing 9 National Safety Authorities...

Page 5: ...scharges to a safe level On battery cover see section 2 0 notes 10 and 11 At terminals do not exceed rated input voltage Equipment protected throughout by Double Insulation Class II Equipment complies...

Page 6: ...need arise 4 2 Case contents all instruments 1 x MIT400 series instrument 1 x Hard carry case 1 x Red black test lead set with clips 5 x AA LR6 batteries fitted 1 x Warranty card 1 x Calibration cert...

Page 7: ...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 and read the test lead resistance measurement d...

Page 8: ...e Note This limit is increased on MIT480 MIT481 and MIT485 to 75 V but a warning buzzer will indicate voltages above 50 V Use extreme care when using or measuring voltages above 30 V particularly in h...

Page 9: ...ttons Battery internal fuse access panel at rear Result recall and transfer Insulation test ranges OFF positon Resistance ranges Capacitance F Insulation PI test DAR test or timed test button Up down...

Page 10: ...sting will be automatically inhibited and voltage measurement will be displayed 6 4 Backlight operation All instrument displays are backlit The backlight function can be selected at any time while the...

Page 11: ...afety 1 Connect the SP5 probe to the instrument using the special 3 pole ve socket in place of the RED test lead 2 Select a suitable insulation resistance range 3 Press and hold down the SP5 probe but...

Page 12: ...d on the main digital scale in units of V or mV as appropriate In TRMS mode the measured frequency Hz will be simultaneously displayed on the MIT410 MIT420 MIT430 MIT 481 and MIT 40X instruments as sh...

Page 13: ...witch to the desired test voltage 50 V 100 V 250 V 500 V or 1 kV 3 Press and hold the TEST button to start the test 4 The insulation resistance value in both analogue and digital form is displayed tog...

Page 14: ...PI 10 minute value 1 minute value c Dielectric Absorption Ratio DAR DAR is the ratio between the insulation resistance values at 30seconds assigned t1 and at 60 second interval assigned t2 i e after...

Page 15: ...ct the timed test t by pressing PI DAR t function button repetitively until the desired function is displayed Note the test type defaults to insulation resistance when the range switch is moved See fi...

Page 16: ...10 minutes a second test result is stored t2 The resultant ratio is then displayed on the screen The same procedure applies for the D DAR timed tests however the test duration is 60 seconds with the...

Page 17: ...tip will be within the stated tolerance of 1 V The MIT40X is supplied with a default setting of 10 V This can be adjusted in the setup procedure between 10 V and 100 V To adjust the insulation test vo...

Page 18: ...hen enabled the sounder symbol will be shown on the screen display The pass threshold is set to 2 by default but is adjustable as defined in Setup see section 13 Note that the buzzer defaults to OFF o...

Page 19: ...st procedure refer to Figure 10 Figure 10 Resistance k range 1 Turn the instrument ON by rotating the selector switch to the desired k position 2 Connect the test leads to the isolated conductors unde...

Page 20: ...Observe the test result displayed automatically 13 2 Distance measurement by capacitance 4 For the MIT481 and MIT485 instrument only cable length is also be displayed in feet km or kft as defined in...

Page 21: ...20 mA 200 mA default 200 mA All InS Sets low threshold for insulation test buzzer in Mohms Buzzer sounds is result is more than set value 0 5 M 0 5 1 2 5 10 20 M MIT420 MIT40X t Timer for insulation t...

Page 22: ...hold the TEST button to change the value Each subsequent press increments the limit Holding down the TEST button will automatically increment 4 Changing a value will start the lock symbol flashing Thi...

Page 23: ...est result is displayed on the instrument display refer to Figure 13 Screen A The test result will remain displayed for one minute during which time the result may be stored 2 Press STORE to record th...

Page 24: ...displayed Additional information stored with the test result may be viewed using the relevant button For example on insulation test A can be recalled using the A S V key The TRMS key will operate on v...

Page 25: ...ntification number by using the and buttons then press OK to select 3 The test result will be displayed To scroll through the different measurements used in calculating the PI or DAR ratio use the onl...

Page 26: ...sition 2 The latest test result will be displayed Where no results have previously been stored the display will indicate this by three dashes 3 Press OK to delete the displayed test result 4 Observe t...

Page 27: ...ress next button Note that the display now indicates ALL 3 Press OK to delete all the test results Note the progress bar decays as the contents of memory are deleted 4 On completion of the deletion pr...

Page 28: ...od is to Pair F From the MIT430 MIT485 T To the PC As described in in detail below Users familiar with Bluetooth devices may wish to Pair F From the PC In this case Open your Bluetooth Manager usually...

Page 29: ...d device will be shown on the auxiliary display 4 Use the keys to scroll round and locate the address that matches the required one shown on Download manager window 5 With the required address display...

Page 30: ...ts that may be displayed as part of this setup sequence If you get a message bubble or prompt asking you to accept a serial port connection then click and accept ticking the A Always allow check box i...

Page 31: ...e download button d Switch the instrument to the SND position to initiate the communications port and start the download The download may take a few seconds to start if you have the Auto Detect serial...

Page 32: ...f the instrument and disconnect the instrument from any electrical circuits 3 To avoid the possibility of electric shock do not press the test button or touch the fuse when changing batteries 4 To rem...

Page 33: ...d Follow the same procedure as for battery replacement A replacement fuse m must be of the correct type and rating i e 500 mA FF H B C 50 kA min 1000 V 32mm x 6mm 18 Preventive maintenance The MIT400...

Page 34: ...V Ii 1 mA Test current on load 1 mA at min pass value of insulation specified in BS7671 HD384 and IEC364 EN61152 2 2 mA max EN61557 operating range 0 10 M to 1 00 G Leakage current range 10 A to 2000...

Page 35: ...ment MIT420 MIT430 MIT481 and MIT485 Measurement range 100 pF to 10 F Accuracy 5 0 2 digits Distance by capacitance MIT420 MIT430 MIT481 MIT485 Arithmetic conversion from capacitance measurement Defau...

Page 36: ...o 1 G 0 1 per C per G above 1 G Environmental Operating range 20 C to 55 C Operating humidity 95 RH at 0 C to 35 C 70 RH 35 C to 55 C Storage temperature range 30 C to 80 C Calibration Temperature 20...

Page 37: ...MIT430 and MIT485 Download Manager CD 6111 442 Optional accessories and replacements Fused 2 wire test lead set and crocodile clips 6220 789 Bluetooth Module qualifications details Bluetooth identifie...

Page 38: ...air and calibration companies which offer excellent in service care for your Megger products Returning your product to Megger UK and USA service centres 1 When an instrument requires recalibration or...

Reviews: