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LIVE INSULATION TESTER
MLIT - 1
INSTRUCTION MANUAL
Thank you very much for selecting our model MLIT-1
Live Insulation Tester.
Before use the instrument, read this instruction
manual completely and familiarize yourself thoroughly
with all functions.
Keep this instruction manual carefully to take out
whenever you need.
MULTI MEASURING INSTRUMENTS CO., LTD
Akihabara Murai Bldg. 7F, 1-26 Kanda Sakuma-cho,
Chiyoda-ku, Tokyo, Japan, 101-0025
TEL : +81-3-3251-7013 FAX : +81-3-3253-4278
Home Page: http://www.multimic.com/
E-mail: multi@multimic. com
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Summary of Contents for MULTI MEASURING INSTRUMENTS MLIT-1
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Page 1: Instruction Manual
LIVE INSULATION TESTER MLIT - 1 INSTRUCTION MANUAL Thank you very much for selecting our model MLIT-1 Live Insulation Tester. Before use the instrument, read this instruction manual completely and familiarize yourself thoroughly with all functions. Keep this instruction manual carefully to take out whenever you need. -
Page 2: Safety Summary
SAFETY SUMMARY observe by all means ● To use this instrument safely, read this " SAFETY SUMMARY " carefully and apply the instrument correctly. ● The CAUTIONs and WARNlNGs which appear on the following pages are stared to prevent the operator & other people from the dangers and their properties from the damages beforehand. - Page 3 ○ OPERATION CONDITION & CONNECTlON △ ! WARNlNG POSSIBLE ELECTRICAL SHOCK ● This instrument is for the use of low voltage circuit. Do not make measurements of power lines carrying more than AC500V. Before use, check and confirm the voltage of circuit to be measured. ●...
- Page 4 & more difficult, as there are so many places where we cannot cut down the electricity easily. The model MLIT-1 applied the super precision split-core type ZCT and enabled the insulation resistance measurement up to 20MΩ, which has been mostly impossible by clamping CT.
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Page 5: Specifications
3. SPECIFICATIONS 1) INPUT PART (1) VOLTAGE INPUT (PHASE VOLTAGE) ① Input Method : Direct Input by Test Leads ② Input Impedance : more than 1MΩ ③ Input Voltage Range : AC50V～AC500V ④ Input Frequency : 50Hz or 60Hz by Switch ⑤... -
Page 6: General Specification
⑨ Sampling Rate : 2 times/second ⑩ Over Range : ｢OL｣ mark on LCD ⑪ Data Hold : ｢DH｣ mark on LCD and Holding Data : By ｢tanδ｣ ON, display insulation resistance calculated ⑫ tanδMeasurement with tanδ value ⑬ Low Battery : ｢B｣... - Page 7 ACCURACY ( 23℃±5℃, Less than 85%RH ) Leakage Current (Io), Line Current (I), Resistive Leakage Current (Ior) rdg : reading dgt : digit Range Resolution Accuracy (50Hz / 60Hz) ±1.0%rdg±10dgt Voltage (V) 0.1V 0～499.9V ±1.0%rdg±10dgt 200μA 0.1μA 0～199.9μA I, Io 0.200～1.999mA ±1.0%rdg±10dgt 0.001mA 2.00～19.99mA ±1.0%rdg±10dgt...
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Page 8: Name And Function Of Each Part
NAME & FUNCTION OF EACH PART ① Clamp Type ZCT : Current detection Sensor ② Open / Close Lever : ZCT will be opened, when pushing up the both levers and pulling CT to arrow directions. ③ ZCT Output Plug : to be connected with instrument body. - Page 9 ⑧ Insulation Resistance Switch (M Ω ) : By pressing this switch, the insulation resistance value calculated by voltage and Ior value will be displayed. When voltage is not inputted, the display will become “OL”. Fix the wiring system correctly. By once for 1Φ, twice for △ and three times for Y.
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Page 10: Operation Procedure
OPERATION PROCEDURE 5-1) CHANGE OF BATTERIES Confirm that the power is "OFF". Take out the instrument from carrying case and remove the Screw to screw of battery cover by ○ + fix the cover driver. Slide the battery cover to the arrow direction and remove the battery cover. - Page 11 5-2) MEASUREMENT To use the instrument safely, follow the contents described in WARNING and CAUTION without fail. △ ! WARNING POSSIBLE ELECTRICAL SHOCK ● For safety, use the instrument in circuit less than 500V. Before operation, confirm the circuit voltage to be used. POSSIBLE ELECTRICAL SHOCK OR ACCIDENT ●...
- Page 12 (1) Measurement of Line Current Conductor to be measured ① Connect ZCT to CT INPUT of the instrument like as the drawing. ② Press POWER SWITCH ⑤ on. Once all display will be lightened and then, the voltage display will appear. ③...
- Page 13 (3) Measurement of Resistive Leakage Current (Ior) & Insulation Resistance (MΩ) CAUTION FOR MEASUREMENT ● This instrument measures insulation resistance at live line and sometimes, the measurement values may get different form ordinary insulation resistance testers. ● The voltage inputs for the measurement of circuit insulation resistance are different according to single phase / 2 wires, three phase / 3 wires and three phase / 4 wires.
- Page 14 ① Press POWER switch ⑤ once. All display appears and then, becomes voltage display. ② Connect ZCT to CT INPUT and test leads to ～V INPUT according to each color. ③ According to the circuit and apparatus to be measured, input the voltage and current to the instrument.
- Page 15 ○ : Wiring Mode △/Ior 3P/ 3W CIRCUIT ○ 3P / 4W CIRCUIT : Wiring Mode Y/Ior - 14 -...
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Page 16: Inverter Motor
○ AC SERVOMOTOR : Wiring Mode 1Φ/Ior ○ INVERTER MOTOR : Wiring Mode 1Φ/Ior - 15 -... - Page 17 5-3) MEMORY FUNCTION This instrument has memory function and can memorize the measured data and can display such memorized data in LCD. (1) How to memorize Flashing Memory No. ① During the measurement of voltage, Io current, Ior current and or MΩ, once press D-HOLD switch ⑩.
- Page 18 5-4) USE OF SPLIT-CORE TYPE ZCT (ZCT-30SP) (How to open/close) UP & DOWN LEVER ① Push up and down levers by fingers and pull CT to the arrow directions like as drawing. ② When clamping CT to the conductor to be measured, join left & right side slowly and push them up until up &...
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Page 19: Repair Service
6. REPAIR SERVICE When requesting for repair service, Please bring the instrument directly to the dealer where you bought. When mailing the instrument, always pack it in its original or equivalent packing materials to avoid any damage during the transportation and also put together with documents showing your name, address, phone number and defect point.
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