How do you use a megohmmeter?
Place one meter lead on the ground terminal or wire and place the other meter lead on one of the phase wires or terminals. Press TEST on the meghometer. A very high resistance reading (generally greater than 10 megaohms) will indicate the motor insulation is good.
How do you use a cable megger?
Clamp the alligator clip on one of the megger probes to the wire or cable, touch the other probe to the exposed conductor and press the test button. The megger will generate a current between the probes, and the meter will record the resistance of the jacket to the flow of the current.
How do you read megger results?
If the megger reads a resistance under 1 (1,000 ohms) on your meter after the initial 60-second interval, the cable has failed and the cable should be removed. If the megger reads a resistance between 1-1.25 on your meter, then the cable passes. Any reading above 1.25 is considered excellent.
How does a megger tester work?
Megger works on the principle of electromagnetic attraction. When a primary coil that is carrying current is placed under the vicinity of a magnetic field it experiences a force. This kind of force generates a torque that is made to deflect the pointer of the device which gives some reading.
How do you test a motor with a megohmmeter?
How to Test a Motor using Megger?
- Place one megger lead on the ground terminal or wire and place the other lead on one of the phase wires or terminals.
- Press test on the megger.
- A very high resistance reading (greater than 10 megohms) will indicate the motor insulation is good.
How do you connect Megger Leads?
How to Connect a Megger
- Disconnect the item being tested from other circuitry and the power supply if possible.
- Connect one test lead of the megger to the insulation and the other test lead to the conductor.
- Rotate the crank until the slip clutch begins to slip.
- Note the reading from the meter.
What does OL mean on a megohmmeter?
over load
If your megohmmeter is reading “OL” (over load) or “I” (infinity), these are commonly used readings on megohmmeters when the measurement exceeds the maximum indicated value of the tester.
How do you connect megger Leads?
Can a megger shock you?
Remember, 5 milli-Amps will shock you, and 50 milli-Amps can kill you. So the next time you’re taking a quality control measurement with your insulation tester and it begins to beep, know that it is simply a safety feature and the tester is alerting you that the voltage being applied is up to 1,000 volts.