NDGM Series Adjustable High-Voltage Digital Megohmmeter-Wuhan Nanxing Electric Power Technology Co., Ltd.

Phone: 400-027-8938

Mobile: 133 9714 9829

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NDGM Series Adjustable High-Voltage Digital Megohmmeter

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Insulation Resistance and Grounding Resistance Testing Series

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NDGM 系列可调高压数字兆欧表(1)

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Performance Features

1. Strong anti-interference capability: The device’s resistance to electric-field-induced interference reaches 2 mA (50 Hz), and it is capable of measuring the insulation resistance of large 500-kV transformers on-site at a 500-kV substation without disconnecting the leads.

2. Large short-circuit current : The typical short-circuit current is 10 mA, making it suitable for testing high-capacity and high-inductance devices.

3. Wide resistance measurement range: The measurement range starts from 0.01 MΩ. ~1999 GΩ , accurate readings and high resolution.

4. Wide high-voltage output range: Options include 0.1 kV, 0.25 kV, 0.5 kV, 1 kV, 2.5 kV, and 5 kV; voltage can also be smoothly adjusted from 0 V to the desired level.

5. Audio-visual alerts: It features a timing function to remind users to record and analyze the absorption ratio and polarization index of the measured object.

6. High Quality: All critical components are sourced from imported parts, ensuring accurate measurement precision.

7. Ease of Use: It features an all-in-one chassis, offering a compact footprint, lightweight design, and easy portability.

8. Exquisite appearance: Made from robust, highly wear-resistant materials, the instrument boasts a premium feel and an extended service life.

Technical indicators

1. Test voltage levels: 0.1 kV, 0.25 kV, 0.5 kV, 1 kV, 2.5 kV, 5 kV

2. Test voltage accuracy: ±(5% + 10 V)

3. Short-circuit current: typical value 10 mA

4. Range and Accuracy

Quantity Cheng	Effective range for resistance measurement	Refined degree
20 MΩ	0.01–19.99 MΩ	±(5%＋3d)
200 MΩ	5.0–199.9 MΩ	±(5%＋3d)
2 GΩ	0.05～1.999 GΩ	±(5%＋3d)
20 GΩ	0.5–19.99 GΩ	±(5%＋3d)
200 GΩ	5.0–199.9 GΩ	±(10% + 3d)
2000 GΩ	50–1999 GΩ	±(20%＋10d)

5. Immunity to electric field interference: 2 mA (50/60 Hz).

6. Time‑keeping and alarm functions: The stopwatch displays a maximum of 19 minutes and 59 seconds, cycling every 20 minutes; audible alerts sound at 15 seconds, 60 seconds, and each minute. Upon reaching the set time, a brief beep is emitted, and the resistance reading remains displayed for 3 seconds. If the measured resistance falls below the lower range limit or the reading is invalid, a continuous audible alarm is activated.

7. Display panel: Three 3½-digit LCD displays, showing the test voltage, resistance, and time, respectively.

8. Power Supply: Includes ten 1.2 V/2000 mAh Ni‑MH rechargeable batteries, providing a total of 12 V DC. Equipped with an AC input (50/60 Hz, 220 V) for battery charging or float‑charge operation.

9. Operating Environment

Temperature: -20℃ to +40℃

Relative humidity: 20%–90%

10. Dimensions: 315 × 240 × 180 mm (Length × Width × Height)

11. Weight: 5.5 kg

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NDGM Series Adjustable High-Voltage Digital Megohmmeter

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