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Megger MIT300 User Manual

Manual is about: MIT300 series Insulation Tester

Summary of MIT300

  • Page 1

    M mit300 series insulation and continuity testers user manual mit300_ug_en_v11.Qxp 14/1/09 3:03 pm page 1 www.Netzerotools.Com www.Netzerotools.Com.

  • Page 2

    G safety warnings n safety warnings and precautions must be read and understood before the instrument is used. They must be observed during use. N the circuit under test must be switched off, de-energised and isolated before test connections are made when carrying out insulation and continuity tests...

  • Page 3

    Insulation testing 15 test lock 15 sp4f switched (optional accessory for mit320) 16 test result storage (mit330 only) 16 replacing batteries and fuses 18 low battery warning symbol 18 to replace batteries 18 fuse replacement (user replaceable) 19 preventive maintenance 19 technical specification 20 ...

  • Page 4

    The mit300 series variants have the following features: mit300 mit310 mit310a mit320 mit330 insulation testing 1 kv insulation range n n n n 500 v insulation range n n n n n 250 v insulation range n n n n n insulation test full scale 999 m Ω 999 m Ω 999 m Ω 999 m Ω 999 m Ω insulation limit alarm 0.0...

  • Page 5

    Please complete the warranty card and return it to megger limited as soon as possible to help us reduce any delays in supporting you, should the need arise. Case contents 1 x mit300 series insulation tester 1 x red/black test lead set with clips 8 x aa (lr6) batteries fitted 1 x warranty card 1 x ce...

  • Page 6

    6 lcd display front panel (digital instruments) mit300, 310, 320 and 330 mit310a voltage warning led test lock led test lead null battery check battery condition indication moving coil analogue display indication mit300_ug_en_v11.Qxp 14/1/09 3:03 pm page 6 www.Netzerotools.Com www.Netzerotools.Com.

  • Page 7

    Memory control keys: store: store initiates the storing of a test result. Last/next: selects the type of location; ie job, distribution board, circuit, phase etc. Esc: aborts a save at any time. Ok: final operation to save the result. S selects the job, db, circuit number; ie 01,02,03 etc t lid open...

  • Page 8

    General operating instructions 8 safety note: if a voltage greater than 25 v appears on the circuit under test the instrument will default to a voltage measurement and display the supply voltage. On supply voltages over 50 v the instrument will prevent the test button from performing an insulation t...

  • Page 9

    Voltage warning (mit310a only) if a voltage exists on the circuit under test the voltmeter will indicate this. However voltages under 50 v will be displayed but may be difficult to read from the analogue display. Default voltmeter (mit310, mit320 and mit330) the default voltmeter automatically opera...

  • Page 10

    10 4. The display shows the resistance value. (maximum 99,9 Ω ) 5. Disconnect the test probes to terminate the test. 6. On completion of testing switch to the [off] position. Alternatively auto shut off operates after a period of instrument inactivity. All continuity measurements are auto ranging fr...

  • Page 11

    11 continuity buzzer (mit300, 310, 320, 330) 4. When the display reaches the desired value release the [test] button 5. Press the l button to store the value to select a threshold value above 5.0 Ω 1. Switch the mit320 or mit330 to [setup]. The display should flash between con and 5.00 Ω . 2. Hold t...

  • Page 12

    (refer to page 14 for additional mit310a notes) safety note: insulation testing is performed at high dc voltages and could be hazardous if touched. Always observe the safety precautions when performing an insulation test, and ensure all necessary health and safety precautions are observed. Automatic...

  • Page 13

    Insulation test m Ω alarm on/off (mit320/mit330 only) the buzzer can be enabled or disabled for working in office environments. To enable the buzzer: 1. Switch the instrument to [setup]. 2. Repeatedly press the [test] button until the display shows on/off. 3. Press and hold the [test] button to sele...

  • Page 14

    If a voltage greater than 2 v a.C. Or d.C. Is present at the terminals the measured voltage is indicated on the display. If the fuse is blown the voltmeter will still operate - see note 1. For normal voltage measurement: 1. Set the range switch to [v] 2. Connect the test leads to the circuit under t...

  • Page 15

    15 test should be performed with the leads shorted together or the battery test mode should be selected to ensure the batteries are in good working condition. Mit310a test lock the [test] button can be locked down to allow continuous continuity or insulation testing. To enable the test lock: 1. Pres...

  • Page 16

    Storing contintuity test results: results storage has the following structure: 000, 002…255 = job number b00, b01, b02 …99 = distribution board no. C00, c01, c02…99 = circuit number r12, rrn, rr2, rr1, r1 & r2 = circuit type p1 to p3 = phase job number ( 000, 001…)acts as a work folder, allowing a s...

  • Page 17

    Storing insulation test results: storing an insulation test result is exactly the same as a continuity test. However the circuit type options change to l-e, l-l, l-n, n-e downloading results to a pc: 1. Connect the tester to the pc using the usb test lead. 2. Set the tester range knob to [snd]. 3. R...

  • Page 18

    Warning: this operation is not reversible. All data will be deleted. 18 batteries battery type: 8 x lr6 (aa), 1.5 v alkaline, or 8 x 1.2v nicad, or 8 x 1.2v nimh fuse type: 500 ma (f) hbc 50 ka 600 v fuse blown symbol f low battery warning symbol the battery condition is continuously displayed by th...

  • Page 19

    19 warning: - incorrect battery cell polarity can cause electrolyte leakage, resulting in damage to the instrument. If the battery condition indicator does not show a full charge when battery cells are new, a cell may be reversed. Note: battery cells should not be left in an instrument which may rem...

  • Page 20

    20 note: for the mit310a only, the presence of fast transients in excess of 0.5kv or r.F. In excess of 1 volt on measured circuit may affect the results general specification insulation ranges nominal test voltage: mit310, 310a, 320, 330 1000 v, 500 v, 250 v (d.C.) mit300 500 v, 250 v (d.C.) termina...

  • Page 21

    21 accuracy (at 20°c): ±5% ±2 digits up to 100 k Ω measuring range (mit310a only): 0 - 2 k Ω (refer to continuity) voltage range measuring range: 0 - 600 v a.C. (50/60 hz) or d.C. Accuracy (at 20° c) mit300, 310, 320, 330: d.C. Or a.C. (50/60hz): ±1%, ±2 digits mit310a: ±2.5% of scale length for 50/...

  • Page 22

    22 weight all units 980gms e.M.C. In accordance with iec61326 -1 mit300_ug_en_v11.Qxp 14/1/09 3:03 pm page 22 www.Netzerotools.Com www.Netzerotools.Com.

  • Page 23

    23 order code included accessories test lead set (red & black) with crocodile clips 6220-779 usb download lead (mit330 only) 25970-041 download manager cd 6111-442 quick start guide 5174-188 cd containing user manual optional accessories fused lead set 2 wire fused probe and clip set 6220-789 sp4f s...

  • Page 24

    24 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 e...