Sometimes people call this tool with the name megohmeter or megger. When used as a voltage leak test (due to leakage of insulation) it requires a voltage of 9V supplied by 6 UM-3 batteries each producing a voltage of 1.5V. Via DC to DC Converter voltage of 9V will be raised up to 1000V. Test results can be read on two flow paths on a scale board.
The upper groove is used for reading resistance measurement of resistance from 0-2000 MΩ, lower groove is used to read the result of voltage measurement from 0-600V. When measuring the voltage leakage, the ideal reading result on the papan scale board is infinity (∞), this means there is no leakage in the utilization of the utility voltage.
a. Getting Started
1. Before measuring the AC voltage check the meter’s designation on the scale board. The needle must be at the zero or (∞) position.
2. If required by using a minus screwdriver (-), set the needle positioner in the zero adjustment so that the needle on the scale board actually points to a zero.
3. Before making a measurement check the battery condition, set the left switch at B.CHEK position, set the right switch in position MΩ .
4. If necessary the battery can be replaced.
5. When measuring AC voltage never touch the tip of the investigator cable ( probes )! You can be stung by high voltage electricity.
6. When measuring AC voltage, battery is not needed.
b. Measuring Isolation
1. Make sure the circuit to be measured is in the “OFF” position and not connected to the AC voltage source.
2. Set the left switch in the “ON MΩ” position of the right switch in position “MΩ” POWER ON Indicator will work.
3. Insert the high-voltage (red color) probes cable into the jack marked “M” , the black probes cable into the black holes (on the right of the hole marked “M” ). .
4. Connect the black probes cable (using the clip alligator) to the “common” or ground of the circuit to be measured. For TV, connect to TV chassis.
5. Touch the investigator cable (probes) high voltage to the point to be measured (copper wire from the power cord for example). In order to avoid electric shock, keep your finger position on the back of the safety.
6. Read the measurement results on the scale board. Sometimes the measurement results are less satisfactory. This occurs because the contact between the tip of the investigator cable ( probes ) with the point to be measured is less than perfect.
7. If there is no leak in the insulation that wraps the power cord (or other electronic circuit), the needle will still point to infinity (∞).
8. If there is a leak in the insulation that wraps the power cord (or other electronic circuit), the needle moves to the right.
c. AC Voltage Measurement
1. Set the left switch in “OFF (ACV)” position , set the right switch in ACV position.
2. Insert the investigator cable ( probes ) into the ACV jacks .
3. Connect the investigator cable ( probes ) to the point containing the AC voltage.
The measurement results are read on the scale board.
d. Safety and Safety Tool
1. Remember one thing! High-voltage electric shocks can make a current of 10 milli-Ampere enter the heart and stop the heartbeat of humans. DC and AC voltages below 35 Volts still contain a danger to humans. High electricity is even more dangerous.
2. The output voltage of the MΩ mode can be up to 1000V, but the current that accompanies it is not large so it is not so dangerous, however Insulation Tester contains high electric shocks, so never touch the tip of the probes cable.
3. If you want to improve the Insulation Tester and open the case , remember one thing that there may still be a voltage as high as 1000 Volts at the points of the circuit. Some points may still contain large currents, as well as investigator cables ( probes ) still contain high voltage, avoid direct contact.
4. Do not use Insulation Tester to measure AC voltage above 600 Volt.
5. When checking whether the leak insulation (resulting in a leakage), make sure the circuit to be checked is free from the power grid or other power source.
Avoid direct contact with points in high-voltage circuits such as “ON-OFF” switches, fuse, transformers, and so on. At these points sometimes there is still a high voltage, although the plane to be measured has been turned off ( “OFF” )