A downloadable insulation and continuity tester made for demanding applications is the Megger MIT330. Test results can be stored in internal memory of the MIT330. More than a thousand results can be downloaded via USB to a computer and saved locally. It is possible to add a job reference number, which makes it possible to test different locations using the same tester and to manage the downloaded file with ease. When the instrument is turned off or the batteries run out, the test results are all kept in non-volatile memory. A memory bar graph serves as a "Fuel Gauge," indicating the amount of RAM that has been utilized. Test results can be imported into Microsoft Excel and downloaded as CSV spreadsheets. Download Manager (Supplied) can be used to download all data via USB. The results can be downloaded straight into Megger Powersuite Professional (Optional), which offers a number of features for producing professionally finished documentation, in the event that certificates or reports are needed.
- Nominal test voltage
Ten V, twenty-five V, fifty V, hundred V, 250 V, 500 V, and MIT417/2, ten V, twenty-five V, fifty V, hundred V, 250 V, 500 V, and 1000 V
Insulation accuracy
Ten GΩ ± 2% ± two digits ± 4.0% per GΩ at 50 volts
Twenty GΩ ± 2% ± two digits ± 2.0% per GΩ at 100 volts
Two digits plus or minus 0.8% per GΩ at 250 volts
- 50 GΩ ± 2%
A 500-volt system is 100 GΩ ± 2% ± 2 digits ± 0.4% per GΩ.
2000 GΩ ± 2% ± 2 digits ± 0.2% per GΩ at 1000 volts
Service Error: BS EN 61557-2 (2007)
± 2.0% ± 2d, 100 kΩ - 900 kΩ ± 10.5% for 50V and ± 2.0% ± 2d, 100 kΩ - 900 kΩ ± 10.3% for 100V
In 250V, there is an error of 2.0% to 2.3% in the 100 kΩ to 900 kΩ range and 10.3% in the 500V range.
100 kΩ - 900 kΩ ± 11.5%, 1000V: ± 2.0% ± 2d
Analog display range: 1 GΩ full scale
0.1 kΩ is the resolution.
To EN 61557-2 (2007), the short circuit/charge current is 2 mA +0% -50%.
Insulation against open circuit voltage: -0% + 2% ± 2V
Test current: 1 mA at minimum
- pass insulation value up to 2 mA maximum.
10% ± 3 digits of leakage
Voltage: 3.0% ±3 figures ±0.5% of the voltage that is rated
Control the timer with a 60-second countdown.
Note: Only when using premium silicone leads do the above specifications apply.
Continuity
Measurement of continuity: 0.01 Ω to 999 kΩ (or, on an analog scale, 0 to 1000 kΩ).
± 3% ± 2 digits (0 to 100 Ω) / ± 5% ± 2 digitis (>
- 500 kΩ–1MΩ) is the continuity accuracy.
Error in Service: 2007'
- s BS EN 61557-4 - 2.0% ± 2.0%, 0.1 Ω ± 2.8%
Voltage at open circuit: 5 V ± 1 V
200 mA (–0 mA + 20 mA) of test current (0.01 Ω to 4 Ω)
Polarity: Dual polarity (configurable during setup) or Single polarity (default).
Resistance to lead: Null up to 9.00 Ω
Voltage
Voltage range AC: TRMS sinusoidal, 10 mV to 600 V (15 Hz to 400 Hz)
DC voltage range: 0–600 V
Accurate voltage range in AC: ±2% ±1 digit
Accurate DC voltage range: ±2% ±2 digit
Error in Service: 2007'
- s BS EN 61557-1 - 2.0% ± 2d, AC/DC 0 V - 300 V ± 5.1%
Waveform Undefined range: 15 to 400 Hz – 10 mV
Additional specifications are applicable to non-sinusoidal waveforms: >
- 100 mV to 600 V TRMS ±8% ± 2 digits ±3% ± 2 digits TRMS range: 10 mV–100 mV
Frequency
Range of frequencies measured: 15 Hz - 400 Hz
Accuracy of frequency measurement: ±0.5% ± 1 digit (unspecified range of 100 Hz to 400 Hz).
Power supply
R6HP) NiMH rechargeable cells, alkaline, / 6 x 1.2 V
Battery life: 3000 insulation tests at 1000 V into 1 MΩ with a duty cycle of 5 seconds ON and 55 seconds OFF
Measurements: Device dimensions: 228 x 108 x 63 mm
- or, 9.00 in. x 4.25 in. x 2.32 in.
Weight: 1.32 lb (600 g
- MIT400/2)
Weight: 1.75 kg (3.86 lb) (instrument and case combined).
Fuse: Only use one 500 mA (FF) 1000 V 32 x 6 mm ceramic fuse with a minimum 10 kA high breaking capacity. It IS NOT ALLOWED to install glass fuses.
safeguarding safety: The instruments satisfy Category IV of EN 61010-1 (1995) up to 600 V phase to earth. See the provided safety warnings.
EMC: Complying with IEC 61326, with Amendment No. 1 on Temperature
Environmental
Operating range: -10 to +55 °C
- maximum temperature of 40 °C
- relative humidity: 90%.
Temperature range for storage: -25 to +70 °C
Temperature of calibration: +20 °C
Peak elevation: 2000 meters
IP rated at 54
- By electricians, for electricians
Backlit Screen with Locking Test Button and Auto Shutdown
Test Probe Data Storage with Switches (1000 Results)
USB download for PC
IP54 Insulation that is weatherproof Testing: 1000M Ohms at 250V, 500V, and 1000V
Testing for Continuity: 100 Ohms
Measurement of Voltage: 600V AC/DC
Measurement of Resistance: 10 Ohms to 1M Ohms in range
