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Megger is offering their MJ159 212159 Hand-Crank Insulation Tetser. The MJ159 is equipped with an analog display featuring four selectable test voltages of 100, 250, 500, and 1000 vdc. It’s capable of insulation resistance measurements up to 2000 MΩ and an ohm range to 5000 ≈. The MJ159 is powered by a low voltage, hand-cranked generator.
Insulation Range
Insulation Resistance: 0.1 Ω - 2000 MΩ
Accuracy: ±1.25% of fsd on a 2.8 in. (71.1mm) arc length
Nominal Test Voltages
d.c: 100 V, 250 V, 500 V, 1000 V
Accuracy
250 V, 500 V, 1000 V +30%, -0% max.
50 V, 100 V, +40%, -0% max.
Midscale: 4 MΩ
Short Circuit Current: 1.9 mA
Maximum Load Capacitance: 1μF with less than ±0.1 in. pointer movement
Discharge: Up to 1 μF capacitance is discharged from 1000 V to less than 42.4 V in less than 4 secs
Resistance Range
0.1 Ω - 5000 Ω
Test Voltage Characteristics
Open circuit Test voltage: 3 V ±0.2 V
Short Circuit Current: 2 mA ±10%
Accuracy: ±1.25% of fsd on a 2.8 in. (71.1mm) arc length
Safety Voltage Check
Voltage measurement: 0.1 V - 600 V a.c; the meter is RMS calibrated and average responding
Safety voltage indicator: Indicates the presence of d.c. voltages. Scaling is not the same as the a.c. meter. True d.c. voltage equals scale reading divided by 2.22
Accuracy: 2.5% of full scale
Power Supplies
MJ159: Low voltage brushless a.c. generator. Cranking speed between 130 rpm and 170 rpm
MJ359: Dual operation low voltage brushless a.c. generator or 120 V 50/60 Hz mains (line) supply
Safety
The instruments meet the requirements for double insulation to IEC 1010-1(1995), EN 61010 (1995) to installation Category II, 300 V phase to earth (ground), 600 V installation Category I
Flash Test
6 kV a.c. r.m.s.
Fuses
500 mA (FF) 660 V Ceramic 50 kA HBC 11/4 x 1/4 in.
(32 mm x 6 mm)
7A (F) 440 V Ceramic 10 kA HBC
11/4 x 1/4 in. (32 mm x 6 mm)
100 mA (F) HBC 20 mm x 5 mm (for line protection only)
MJ359 only:
Power connection plug fuse 100 mA 240 V HBC (20 mm x 6 mm)
Mains power cord fused plug (when applicable) 3 A 250 V ceramic
HBC fuse to BS1362 11/4 x 1/4 in. (32 mm x 6 mm)
E.M.C.
In accordance with IEC 61326 includes amendment No. 1.
Operating Temperature Range
32° to 113°F (0° to 45°C) for battery operated models
14° to 122°F (-10° to 50°C)
Humidity Range
Operating:
70% RH max. at 68°F (20°C)
60% RH max. at 95°F (35°C)
50% RH max. at 105°F (40°C)
Storage: 95% RH max. at 95° F (35°C)
Dimensions
5.1 H x 4.9 W x 7 L in.
(130 H x 125 W x 180 L mm)
Weight
Approximately 2.3 lb (1 kg)
Cleaning
Wipe disconnected instrument with a clean cloth dampened with soapy water or Isopropyl Alcohol (IPA).
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