Despite its compact, handheld design, the Megger MIT485/2 Insulation Tester is a sophisticated device that can voltage test insulation up to 500V and 100G. The feedback-controlled insulation test voltage is now accurate to within +2%, instead of the previous +10–20%, meaning that testing is more accurate and there is less risk of damage caused by over-voltage. It is primarily intended for use in the telecommunications or cable testing sectors. The user can then easily select the correct pair using the on-screen interface by connecting concurrently to A, B, and E test leads using the three terminal connection. Consequently, the Megger MIT485/2 can be used as a traditional two terminal device, but there's no need to switch wires when taking different measurements. The Megger MIT485/2 is easy to use because it has pre-set test voltages of 50V, 100V, 250V, and 500V. The user can also set custom voltages between 10 and 500V. A clear pass/fail indication on the screen simplifies the results, and precise readings for the resistance and current test voltage are displayed. Tests are timed out automatically after a predetermined amount of time, and dynamic readings are also depicted through a moving "analogue" arc. While the Megger MIT485/2 automatically detects voltage and stops testing if it exceeds user-adjusted limits, feedback control of voltage improves safety and accuracy. Once more completely customizable, an insulation buzzer alerts the user if insulation exceeds a predetermined threshold. For continuity testing, the Megger MIT485/2 has two test currents of 200 mA and 20 mA. The continuous, automatic range now extends from 0.01 Ω to 1MΩ. 'NULL' lead resistance compensation improves accuracy, and ratings for differential and REN measurement are provided. There are also true RMS voltage readings available (0 to 600V AC/DC). The Megger MIT485/2 can also measure capacitance between 0.1nF and 10µF and frequency between 15Hz and 400Hz, among other general measurements. Improvements over the previous Megger MIT480 range include a redesigned back-stand, a compartment for six cells with a separate fuse access, and a redesigned case. The instrument's large, two-line display and analogue needle provide a clear, dynamic display of measurements, and it is IP54 weatherproof certified in addition to being over-molded for enhanced protection. Excel/CSV files containing data can be downloaded with ease thanks to Bluetooth connectivity. The Megger MIT485/2 is a multipurpose, safe measurement tool with a plethora of safety features and remarkable measurement capabilities over insulation testing, capacitance, voltage, and continuity testing. Premium silicone leads, an SP5 switched probe, an owner's manual CD, six AA batteries, and a sturdy carrying case are included.
- Insulation
Test voltage nominal: 50, 100, 250, and 500 volts
Accurate insulation
Ten GΩ ± 2% ± two digits ± 4.0% per GΩ at 50 volts
Twenty GΩ ± 2% ± two digits ± 2.0% per GΩ at 100 Volts. At 250 Volts: 500 Volts: 100 GΩ ± 2% ± 2 digits ± 0.4% per GΩ
- 50 GΩ ± 2% ± 2 digits ± 0.8% per GΩ
BS EN 61557-2 is the service error (2007).
100kΩ - 900kΩ ± 10.5%, 50V: ± 2.0% ± 2d
± 2.0% ± 2d, 100kΩ - 900kΩ ± 10.3% for 100V
250V: 2.0% +/- 2d, 100kΩ - 900kΩ ± 10.3% 500V: 2.0% +/- 2d, 100kΩ - 900kΩ ± 10.3%
Range of display: Analog: full scale of 1 GΩ
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% ± 2 V
Test current: 1 mA at minimum
- pass insulation value up to 2 mA maximum.
EN61557 The operational range is 0.10 MΩ to 1.0 GΩ.
Current Leakage: 10% +/- 3 digits
Control timer: 60-second countdown timer
Note: Only when using premium silicone leads do the above specifications apply.
Continuity
Continuity range: 0.01 Ω to 1.0 MΩ
Continuity accuracy: ± 3% ± 2 digits (0 to 100 Ω)
- ±5% ±2 digits (>
- 100 Ω- 500 kΩ)
- (>
- 500 kΩ - 1 MΩ unspecified)
Service Error: BS EN 61557-4
(2007) - ± 2.0%, 0.1Ω - 2Ω ± 6.8%
Open circuit voltage: 5 V ± 1 V
Test current: 200 mA (–0 mA +20 mA)
- (0.01 Ω to 4 Ω)
Lead resistance: Nulling up to 10 Ω
Voltage range
Voltage range AC: 10 mV to 600 V TRMS sinusoidal (15 Hz to 400 Hz)
Voltage range DC: 10 mV to 600 V
Volt range accuracy AC: ± 2% ± 2 digits
Volt range accuracy DC: ± 2% ± 2 digits
Service Error: BS EN 61557-1 (2007) - ± 2.0% ± 2d, 0V - 300Vac/dc ± 5.1%
Waveform: Unspecified range: 0 – 10 mV (15 to 400 Hz)
Waveform for non-sinusoidal waveforms
additional specifications apply: ±3% ± 2 digits >
- 100 mV to 600 V TRMS
- ±8% ± 2 digits 10 mV to 100 mV TRMS
Default voltmeter: Operates at >
- 25 volts ac or dc on any range except OFF
Frequency
Frequency measurement range: 15 Hz - 400 Hz
Frequency measurement accuracy: ±0.5% ± 1 digit
Capacitance measurement
Capacitance range: 0.1 nF to 10 μF
Accuracy: ± 5.0% ± 2 digits ( 1 nF-10 μF)
Cable coefficient: 40n F/ km to 70nF / km
Unit of measure: 50nF / km
Result storage
More than 1000 test results can be stored.
Bluetooth®* wireless and Bluetooth® Class II data download
Range: ten meters or more
Power supply
Energy source Six 1.5 V Alkaline cells (AA, MN1500, HP7, AM3 R6HP) of type IEC LR6 are available
- six 1.2 V NiMH rechargeable cells can also be utilized.
Battery life: 3000 insulation tests at 500 V into 500 kΩ with a duty cycle of 5 seconds ON and 55 seconds OFF
Charger: 12–15 V DC (accessory interface) is optional.
The measurements are 228 x 108 x 63 mm, or 9.00 in by 4.25 in by 2.32 in.
800 g in weight
Weight: 1.75 kg (3.86 lb) (instrument and case combined).
Use only two 500 mA (FF) 1000V 32 x 6 mm ceramic fuses with a minimum 30 kA high breaking capacity. It IS NOT ALLOWED to install glass fuses.
Safety protection: EN 61010-1 (1995) to 600V phase to earth, Category IV, is met by the instruments.
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 54 * is the IP rating.The Bluetooth SIG, Inc. is the registered trademark owner of the Bluetooth word mark and logos, which are used under license.
- made specifically for cable and telecom testing
testing of insulation to 500V and 100G
Testing for continuity to 1M
Measurement of true RMS voltage between 10 mV and 600 V AC/DC
Measurements of capacitance and frequency
A, B, and E connections using three wires
Bluetooth connectivity for data transfer
IP54-certified weatherproof
Test voltage precision is +2%.
Digital display and analog arc together
function of auto-testing
