The new Megger MIT400 series of insulation and continuity testers has been designed for electrical testing by the utilities, industrial, commercial and domestic electricians. The wide
range of features also makes the MIT400 series ideal for maintenance and service/repair engineers. They give greater functionality than previous instruments, with simplified operation, wider range of applications and increased safety.
MIT410-TC2: 50 V, 100 V, 250 V, 500 V and 1000 V + PI, DAR
MIT430-TC2: 50 V 100 V, 250 V, 500 V & 1000 V + Bluetooth Download
Insulation Testing
Test voltages - 250 V to 1000 V or 50 V to 1000 V insulation test voltages available
Test Lock - Locks insulation test on continuously
Test voltage display - The actual test voltage is displayed on the smaller digital readout, with the insulation result on the larger digital display.
Analogue arc - The display also features an analogue arc to replicate the response of a moving coil display.
PI and DAR - Polarisation Index (PI) and Dielectric Absorption Ratio (DAR) functions.
Silicone leads - High quality flexible silicone test leads are comfortable to use and prevent measurement errors on higher GΩ ranges.
Test inhibit - prevents testing if voltages in excess of 50 V are detected when making insulation tests.
Insulation buzzer - The buzzer can be set to buzz if the insulation resistance is above a preset limit, set via the setup menu.
Continuity Testing
Auto test - Auto test on circuit contact enables real two handed operation without the need to press the test button
200 mA or 20 mA- Either 200 mA or 20 mA continuity test currents are available. 20 mA test current will considerably increase battery life
Lead null - Lead resistance compensation (NULL) operates up to 9.99Ω of resistance.
Buzzer - ON-OFF selected by simple push button.
Buzzer limit - Continuity buzzer limit alarm provides adjustment of the maximum resistance the continuity buzzer sounds. This is adjustable from 1Ω to 20Ω
in 5 steps.
kΩ range - extends resistance measurement to 1 MΩ.
Display
The display offers a combination of analogue arc and a dual digital readout
Analogue arc:
Full display width analogue arc.
Patented arc display shows essential charge and discharge characteristics not visible on a digital display.
Single pointer "needle" response is similar to a moving coil meter.
Logarithmic display for better low insulation value measurements.
Dual digital display:
Large main digital readout for good visibility of all main measurement results.
Second digital display for additional data such as:
Insulation test voltage.
Insulation leakage current.
Supply frequency (when measuring volts).
Test mode eg. PI, DAR or TI (Timed mode).
Storage & Downloading Results
MIT430
The MIT430 supports both test result storage and downloading. Test results can be stored in the instrument and subsequently downloaded to a computer with the Megger download
manager software. Data transfer is by Bluetooth.
NOTE: The receiving PC needs to have Bluetooth capability or a USB port fitted a Bluetooth receiver. Class II (10m) is acceptable.
Safety
Designed to be exceptionally safe to use, fast detecting circuitry prevents damage to the instruments if accidentally connected to live circuits or across phases.
Specifically, all instruments:
Meet the international requirements of IEC1010-2 and EN61557.
Live circuit detection inhibits insulation testing on circuits above 50 V.
Live circuit detection and test inhibit on continuity measurements.
Default display of live circuit voltage on all ranges.
Detection and inhibit functions operate even if the protection fuse has failed.
Suitable for use on CAT IV applications and supply voltages to 600 V
600 V CAT IV
All MIT400 instruments are designed to meet the safety requirements for use on CAT IV 600 V
Specification
All quoted accuracies are at +20°C.
Insulation Nominal test voltages: 50 V, 100 V, 250 V, 500 V, 1000 V.
Insulation resistance range (at maximum test voltage)
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MIT410-TC2
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100GΩ
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MIT430-TC2
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200GΩ
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Range Full Scale Accuracy
All ranges ±2% ±2 digits up to 100 MΩ.
Then:
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1000 volts.
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±3% ±2 digits ±0.2% per GΩ
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500 volts.
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±3% ±2 digits ±0.4% per GΩ
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250 volts.
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±3% ±2 digits ±0.8% per GΩ
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100 volts.
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±3% ±2 digits ±2.0% per GΩ
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50 volts.
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±3% ±2 digits ±4.0% per GΩ
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10 volts.
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±3% ±2 digits ±2.0% per 100 MΩ
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Analogue range: 1GΩ
Short Circuit Current: 2 mA +0% -50%
Terminal voltage: -0% +20% ±1 V
Test Current on load:
1 mA at min. pass value of insulation specified in BS7671, HD384
and IEC364, 2 mA max.
EN61557 Operating range: 0,10 MΩ to 1,00 GΩ
Leakage current range: 10 µA 2000 µA
Leakage current: 10% ±3 digits
Voltage display: 3% ±3 digits ±0.5% of rated voltage
Polarisation Index (PI): 10 min / 1minute ratio
Dielectric Absorption Ratio (DAR): 60 sec / 30 sec ratio
Notes:
(1) All ranges measure from 0,00 MΩ upwards.
(2) Above specifications only apply when high quality silicone leads are being used.
Continuity
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Measurement:
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0,01Ω to 99,9Ω (0 to 100Ω on analogue scale)
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Accuracy:
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±2% ±2 digits (0 to 100Ω)
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Open Circuit Voltage:
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5 V ±1 V
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Test Current:
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205 mA (±5 mA)
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(0.01Ω to 9.99Ω)
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20mA (±1 mA )
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(10.0Ω to 99.9Ω)
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Zero offset at probe tips:
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0,10Ω typical
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Lead resistance zeroing:
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Up to 9.99Ω
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Buzzer:
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Variable limit 1Ω, 2Ω, 5Ω,
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10Ω, 20Ω
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Resistance
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Measurement:
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0.01 kΩ to 1000 kΩ (0 to 1 MΩ on analogue scale)
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Accuracy:
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±3% ±2 digits up to 50 kΩ
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then ±5% ±2 digits
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Open circuit voltage:
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5 V ±1 V
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Short circuit current:
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1.5 mA ±0.2 mA
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Voltage range
0 to 600 V d.c. ±2% ±2 digits
10 mV to 600 V TRMS sinusoidal (40 to 400 Hz) ±2% ±2 digits
0 to 1000 V on Analogue scale
Unspecified input level 0 - 10 mV (40 to 400 Hz)
For non-sinusoidal waveforms additional specification apply:
±3% ±2 digits 101 mV to 600 V TRMS and ±8% ±2 digits 10 mV to 100 mV TRMS
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Default Voltmeter:
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Operates at >25 V a.c. or d.c.
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on any range except OFF
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Frequency:
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40-450 Hz (40 Hz - 99.9 Hz)
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±0.5% ±1 digit (100 Hz to 450 Hz)
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Capacitance range (MIT430):
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Measurement range:
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100 pF to 10 ìF.
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Accuracy:
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± 5.0% ±2 digits
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Distance by capacitance (MIT430):
Arithmetic conversion from capacitance measurement on Default capacitance measurement: 50nF/km
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Capacitance range:
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40 nF/km to 60 nF/km
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Result storage
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Capacity:
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>1000 test results
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Download:
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Bluetooth wireless
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Bluetooth Class:
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Class II
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Range:
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up to 10 m
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Power Supply: 5 x 1,5 V cells type IEC LR6 (AA, MN1500, HP7, AM3 R6HP) Alkaline NiMH rechargeable cells may be used.
Battery life: 2200 insulation tests with duty cycle of 5 sec ON /55 sec OFF @ 1000 V into 1 MÙ
Dimensions
Instrument: 220 x 92 x 50 mm (8.66 in. x 3.63 in. x 1.97 in.)
Instrument + case: 456 x 178 x 89 mm (18 in. x 7 in. x 3.5 in.)
Weight
Instrument only: 590 gms, 775 gms with boot (20.73 oz. 27.22 oz.)
Instrument plus case: 1.75kg (3.86 lb)
Fuse
Use only a 500 mA (FF) 1000 V 32 x 6 mm ceramic fuse of high breaking capacity HBC 50 kA minimum. Glass fuses
MUST NOT be fitted.
Safety Protection
The instruments meet IEC 61010-1 to 600 V phase to earth, Category IV. Refer to safety warnings supplied.
E.M.C.
In accordance with IEC 61326-1
Temperature effects
Temperature coefficient: <0,1% per °C up to 1 GΩ
Environmental
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Operating range:
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-20 to +55°C
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Download:
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95% RH at 0°C to +35ºC,
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70% RH @ +35ºC to +55ºC
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Storage temperature range:
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-30ºC to +80°C
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Calibration Temperature:
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+20°C
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Maximum altitude:
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2000 m
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Dust and Water Protection: IP54 Protected against dust and splashing water
Service Error
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Insulation range
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±15% ±2 digits
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Continuity range
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±26% ±2 digits
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Resistance range
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±12% ±2 digits
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Voltage range
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±10% ±2 digits
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Capacitance range
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±18% ±2 digits
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Distance range
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±18% ±2 digits
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Frequency range
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±5% ±2 digits
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The Bluetooth word mark and logo are owned by the Bluetooth SIG, Inc. and any use of such marks by Megger is under license.