GM Adjustable High Voltage Digital Megohmmeter

This instrument tests high voltage and strong output, and the measured object often has power frequency leakage or induced high voltage interference electrical energy. Therefore, for personal safety, it is necessary to first connect the safety grounding wire when using this instrument!

After starting the instrument under high voltage, please do not use manual discharge to check the instrument. After the test is completed, you should also wait for the instrument to automatically discharge and return the voltmeter to zero before performing routine manual discharge required for safety! Because the strong electrical pulse wave of short-circuit discharge damages the insulation life of the tested object, and if the pulse enters the instrument, it also damages the integrated circuit inside the instrument!

This instrument is designed and developed by our company to test the electrical insulation resistance characteristics of large high-voltage transformers, motors and electrical appliances, remote power cables or buried cables under strong interference in high-voltage substations and power plants. It can also be used for measuring electrical insulation resistance characteristics in a wide range of fields.

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1. It has strong resistance to electric field induced interference, reaching 2mA (50Hz), and is known to be suitable for measuring the insulation resistance parameters of large transformers at 500000 volts without disconnecting the wires on site in a 500000 volt substation.

2. Test the short-circuit current of the power supply to be greater than 5mA. Suitable for testing large capacity and large inductance.

3. The resistance measurement range is wide, from 0.5M Ω to 200G Ω (up to 2T Ω for GM-15KV and GM-20KVZ). Accurate reading and high resolution.

4. The voltage range of the test power supply is wide, and can be selected from 0.25, 0.5, 1, 2.5, 5, 10, 15, 20. It can also be smoothly adjusted from 0V to continuously adjust to the desired voltage.

5. It has a timing function to remind users to record and analyze the absorption ratio and polarization index of the measured object.

1. Product specifications:

The test voltage can be smoothly and continuously adjusted from 0 volts to the desired value.

2. Range and accuracy:

Note:

① The M Ω range calibration voltage is 0.5KV

② The G Ω range calibration voltage is 2.5kV

③ The 2000G Ω range is used as a reference range for use in dry environments with relative humidity less than 70%.

④ When the test voltage is higher than 8kV and the insulation resistance is higher than 20G Ω, the exposed high-voltage electrode conductor in the air will ionize the air and release charges, resulting in a significantly lower resistance measurement value. For accurate measurement, a shielding mesh should be added to the exposed high-voltage electrode conductor in the air.

3. Anti electric field interference capability: 2mA (50/60Hz)

4. Time reporting and alarm function: The stopwatch displays a maximum value of 19 minutes and 59 seconds. Cycle every 20 minutes. The sound alarm points are 15 seconds, 60 seconds, and per minute. When the point is reached, a short sound will be reported, and the resistance reading will remain for 5 seconds. If the measured resistance is below the lower limit of the range and the reading is invalid, a continuous sound alarm will be triggered.

5. Display table; Three and a half LCD digital meter heads display test voltage, resistance, and time respectively.

6. Power supply; Powered by 10 rechargeable 1.2V/2000mAh nickel hydrogen batteries, totaling DC12V. Equipped with an AC (50/60Hz) 220V access port for battery charging or float charging.

7. Operating environment: Temperature: 0-40 ℃, relative humidity: 20-90%

8. Dimensions and weight: 315 × 240 × 155mm, 5kg