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Megger MJ159 Insulation Resistance Tester
Megger MJ159 Insulation Resistance Tester
The Megger MJ159 is an insulation resistance tester designed for measuring the insulation resistance of electrical installations and equipment.
The instrument is fully electronic, generating a regulated DC high voltage and utilizing low-zero-drift, high-accuracy circuits with high current sensitivity. Designed for portability, it is housed in a molded, impact-resistant, flame-retardant ABS plastic case with a fold-down carrying handle.
As a safety feature, the AC voltage range activates immediately when the instrument is connected to the circuit under test. This provides a warning that the circuit is not de-energized before using the instrument.
Megger MJ159 Key Features
- Portable tester
- No scale multipliers
- Multiple test voltages for spot and step voltage testing
- Guard terminal to eliminate surface leakage current
- Voltage indicating range
- Large, easy-to-read scale
Megger MJ159 Specifications
| Feature | Specifications |
| Insulation Resistance | 0 to 2,000 MΩ |
| Accuracy | ±1.25% of full-scale deflection (fsd) on a 2.8 in. (71.1mm) arc length |
| Nominal Test Voltages | DC: 100 V, 250 V, 500 V, 1000 V |
| Applied Test Voltage Accuracy | 250 V, 500 V, 1000 V ranges: +30%, -0% max. 100 V range: +40%, -0% max. |
| Test Voltage Characteristics | 100V, 250V, 500V, 1kV Test Resistance (MΩ): 0.01, 0.02, 0.05, 0.1, 0.2, 0.5, 1, 2, 5, 10, 20, 50, 100, 200, 300, 1k, 2k, 8 |
| Midscale Resistance | 4 MΩ |
| Short Circuit Current | 1.9 mA |
| Maximum Load Capacitance | 1μF with less than ±0.1” pointer movement |
| Discharge Rate | Up to 1 μF capacitance is discharged from 1000 V to less than 42.4 V in less than 4 secs |
| Automatic Discharge | Capacitive circuits are automatically discharged when the “TEST” button is released following an insulation test. |
| Low Resistance Range | |
| Measuring Range | 0.1 Ω - 5000 Ω |
| Accuracy | ±1.25% of fsd on a 2.8 in. (71.1mm) arc length |
| Test Voltage (open circuit) | 3 V ±0.2 V |
| Scale Length | 3.08 in. (78 mm) |
| Short Circuit Current | 2 mA ±10% |
| Safety Voltage Measurement | |
| Voltage Measurement | 20 V to 600 V AC; RMS calibrated and average responding |
| Safety Voltage Indicator | Indicates the presence of DC voltages. Scaling is not the same as the AC meter. True DC voltage equals scale reading divided by 2.22 |
| Accuracy | 2.5% of full scale |
| Physical Characteristics | |
| Dimensions | 8.25 H x 5 W x 5 D in. (213 H x 124 W x 128 D mm) |
| Weight | Approximately 1 kg (2.3 lb) |
| Cleaning | Wipe disconnected instrument with a clean cloth dampened with soapy water or Isopropyl Alcohol (IPA) |