Megger MIT485/2 Telecom Insulation and Continuity Tester
The Megger MIT485/2 is the most advanced tester in the MIT480/2 series. The new MIT480/2 series replaces the previous MIT480 series, therefore, this MIT485/2 Insulation and Continuity Tester replaces the MIT485 Tester.
The new series of MIT480 Insulation and Continuity Testers have been optimised for use specifically in the telecommunications and testing markets.
Like the previous version, this product includes Bluetooth technology, allowing the data stored in the MIT485/2's integrated memory to be downloaded to a compatible device such as a PC. This way you can save time and effort managing your records by letting your tester do all the work for you! The test results are saved as a CSV file which is viewable as an Excel spreadsheet on PCs.
Testing insulation with the MIT485/2 is easy, quick and safe. It features multiple insulation test voltages, 50V, 100V, 250V and 500V, and can test insulation levels up to 100GΩ. It's also capable of testing AC voltage to 600V (true-RMS), capacitance from 0.1nF to 10μF, frequency from 15 to 400Hz and comes with continuity testing functions with variable current and adjustable fast buzzer. This model features the added capability of calculating the difference between two consecutive continuity tests. Some of the other new features on this model are:
- Three terminal measurement which allows for the connection of three test leads, Tip, Ring and Earth (A,B, E). The user is able to select his/her desired measurement pair using the function button located on the front panel. This selection will be confirmed on the display and the user does not need to disconnect any test leads in order to measure particular pairs.
- Gated access to 500V prevents accidental damage when performing up to 100GΩ insulation tests at this voltage
- Single automatic resistance range: 0.01Ω to 1.0MΩ makes continuity testing quick and easy
- Voltage is stabilised throughout testing
- Input impedance is 10MΩ in order to prevent loading the circuit and reporting low voltages
- Test voltage is indicated throughout testing on the smaller digital readout whilst the measurement detected is indicated on the larger display
- Test range is indicated on the display during selection
- REN value is displayed for the circuit under investigation
- Will indicate Pass or Fail using tick and cross icons
- Rechargeable options are available which can be re-powered using mains or car chargers
- Redesigned case with a back-stand and 6-cell battery and separate fuse access
- Compatible with optional magnetic hanging strap (NOT included)
The new MIT485/2 also includes a number of functions and features present on the previous MIT485 Telecom Insulation and Continuity Tester.
Voltage and Current Testing
As indicated above this instrument can be used to take true-RMS measurements of voltages up to 600V AC/DC with a resolution of 0.1mV. It can take digital and analogue arc voltage measurements and will automatically display the frequency during this measurement. The MIT485/2 Telecom Insulation and Continuity Tester is able to take current measurements between ø and 400mA AC/DC.
Insulation Resistance and Continuity Testing
The Megger MIT485/2 Telecom Insulation and Continuity Tester can test continuity at 200mA or 20ma; can take differential continuity measurements; features an adjustable continuity buzzer and will display the relevant REN value. In addition to this, it also includes a lead nulling feature which remains operational to up to 10Ω of resistance.
When conducting insulation resistance tests the user can also set an adjustable buzzer to his/her desired limit, if this value is breached the buzzer will alert the user. This instrument also includes a variable insulation test voltage which ranges from 10V to 500V and can be adjusted using increments of 1V. The insulation test voltage is feedback controlled. This ensures that it remains accurate (+2% and -0%) and consistent throughput testing, thereby preventing damage to circuits caused by over-voltage.
This instrument also includes a Test Lock function which holds the insulation test on continuously and a Test Inhibit function. The latter function prevents the user from conducting a resistance test if the MIT485/2 tester detects that the voltage is in excess of the user-defined limit.
Safety and Design
The Megger MIT485/2 Telecom Insulation and Continuity Tester has an IP rating of 54 and meets the following safety specifications:
- IEC61010
- EN61557
- CAT IV 600V
Its Test Inhibition and Live Circuit Protection functions prevent damage to the user and instrument should the tester be accidentally connected to a live circuit or across phases. The Test Inhibition function remains operational even if the fuse has failed. Further to this, the Megger MIT485/2 also displays the live circuit voltage on all ranges.
The Megger MIT485/2 Telecom Insulation and Continuity Tester has a rugged, shock absorbing, modified ABS casing making it suitable for use across a variety of environments.
Display
The Megger MIT485/2 Telecom Insulation and Continuity Tester includes a full display with an analogue arc which indicates the change and discharge characteristics which cannot be viewed on a digital display.
Using this display the user can access the setup functions which enable him/her to tailor the adjustable buzzer to his/her preferences.
Finally, the Megger MIT485/2 Tester includes a dual digital display. The large digital display clearly indicates the measurement results, whilst the second, smaller digital display details additional information such as the insulation test voltage; insulation leakage current; supply frequency and differential measurements.
Want to know the difference between each of the products in the MIT480/2 series? The chart below outlines the differences:
| Model | 481/2 | 485/2 |
|---|---|---|
| Insulation Voltage Range | ||
| 50V/ 100V/ 250V/ 500V | √ | √ |
| Variable 10V to 500V | √ | |
| μA button (Leakage) | √ | √ |
| Lock button on MΩ | √ | √ |
| REN Telephone count (discharge) | √ | √ |
| > 500 V Gated Operation | √ | √ |
| Ohms Ranges | ||
| Continuity 0.01 Ω - 10 MΩ | √ | √ |
| Isc: 200 mA R ≤ 4Ω | √ | √ |
| Isc 20 mA | √ | √ |
| Difference measurement [REL] | √ | √ |
| Lead null (<10 Ω) | √ | √ |
| Voltage Measurement | ||
| AC / DC Volts 600 V | √ | √ |
| mV AC / DC range | √ | √ |
| Default Voltmeter | √ | √ |
| TRMS | √ | √ |
| Frequency measurement 15 - 400 Hz | √ | √ |
| Input impedance | 10 MΩ | 10 MΩ |
| Capacitance | ||
| Capacitance 0.1 nF - 10 μF | √ | √ |
| Distance by μF (Open loop) | √ | √ |
| REN calculation | √ | √ |
| Additional Features | ||
| Current measurement mA AC/DC | √ | √ |
| PASS/FAIL on limit alarms | - | √ |
| A/B/E or T/R/G switching | √ | √ |
| Number of terminals | 3 | 3 |
| Onboard memory | √ | √ |
| Bluetooth® and software | √ | |
| Recharger ready | √ | |
| AA Alkaline or NiMH | Both | Both |
| CAT IV / 600V | √ | √ |
| Accessories | ||
| Silicone leads (R,B,G) | √ | √ |
| Switched probe supplied | √ | √ |
Megger MIT485/2 Telecom Insulation & Continuity Tester Key Features
- Selectable test voltages of 50V, 100V, 250V and 500V
- Insulation measurement range of 100GΩ
- Leakage current display
- INS test voltage display
- Live circuit warning
- Continuity testing with 200mA/20mA variable current and selectable buzzer threshold
- Measure voltage to 600V (true RMS)
- Frequency measurements from 15 to 400Hz
- Capacitance measurements from 0.1nF to 10μF
- Integrated memory
- Ergonomically-designed tester designed to fit comfortably in the hand
- Backlit for use in poor lighting conditions
- Battery condition display
- Insulation timed PI and DAR tests
- Test button plus lock button
- Bluetooth download
- Three terminal measurement
- Gated access to 500V prevents accidental damage when performing insulation tests up to 100GΩ
- Single automatic resistance range
- Voltage stabilised throughout testing
- Input impedance is 10MΩ
- Test voltage indicated on smaller digital display
- REN value displayed
- Tick and cross icons indicate Pass or Fail
- Rechargeable options available
- Requires 6AA batteries of either alkaline or Nickel Metal hydride (NiMH) rechargeable type
- Batteries provide a minimum of 3000 insulation tests at 500V
- Back-stand
- Separate fuse access
- Compatible with magnetic hanging strap (NOT included)
- 0.1mV resolution for voltage measurements
- Digital and analogue arc voltage measurements
- Automatically displays frequency during voltage measurements
- Current measurements between ø and 400mA AC/DC
- Differential continuity measurements
- Test lead nulling feature
- Adjustable insulation resistance buzzer
- Variable insulation test voltage: 10-500V adjustable in steps of 1V
- Feedback controlled insulation test voltage is accurate to +2% and -0%
- Test Inhibition function
- IP54
- IEC61010
- EN61557
- CAT IV 600V
- Live circuit detection
- Rugged, shock-absorbing, modified ABS casing
- Full display with analogue arc
- Access setup functions via display
- Dual display
- Large, digital display indicates measurements
- Smaller digital display indicates additional information
What's Included?
- Megger MIT485/2 Telecom Insulation and Continuity Tester
- 1 x Red Silicone Test Lead Complete with Probe and Clip
- 1 x Black Silicone Test Lead Complete with Probe and Clip
- 1 x SP5 Switched probe
- Owner's Information CD
- 6 x AA Batteries
- 1 x Hard Carry Case
Megger MIT480/2 Series Technical Specifications
| Insulation | |
| Test Voltage | |
| Nominal |
MIT481/2 and MIT485/2 |
| Insulation Accuracy |
50 Volts. 10 GΩ ± 2% ± 2 digits ± 4.0% per GΩ |
| Service Error: BS EN 61557-2 (2007). |
50V, ± 2.0% ± 2d, 100kΩ - 900kΩ ± 10.5% |
| Display range | Analogue: 1 GΩ full scale |
| Resolution | 0.1 kΩ |
| Short circuit/charge current |
2 mA +0% -50% to |
| Open circuit voltage insulation | -0% +2% ± 2 V |
| Test current |
1 mA at min. pass value of |
| EN61557 Operating range: | 0.10 MΩ to 1.0 0GΩ |
| Leakage Current | 10% ±3 digits |
| Timer control | Countdown timer 60 second |
| Note |
Above specifications only apply when |
| Continuity | |
| Continuity range | 0.01 Ω to 1.0 MΩ |
| Continuity accuracy |
± 3% ± 2 digits (0 to 100 Ω) |
| Open circuit voltage | 5 V ± 1 V |
| Test current |
200 mA (–0 mA +20 mA) |
| Lead resistance | Nulling up to 10 Ω |
| mA Range | |
| DC |
0.0mA - 500mA: |
| AC |
0.0mA - 10.0mA: unspecified |
| Voltage Range | |
| Voltage range |
AC: 10 mV to 600 V TRMS |
| Volt range accuracy |
AC: ± 2% ± 2 digits |
| Waveform |
Unspecified range: |
| Default voltmeter |
Operates at > 25 volts ac or dc on |
| 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 | |
| Storage capacity | >1000 test results |
| Data download |
Bluetooth® wireless |
| Range | up to 10 m |
| Power Supply | |
| Power supply |
6 x 1,5 V cells |
| Battery life |
3000 insulation tests with duty cycle |
| Charger (Optional) | 12-15 V dc (accessory interface) |
| Dimensions |
228 mm x 108 mm x 63 mm |
| Weight | 800 g (1.8 lb) |
| Weight (instrument and case) | 1.75 kg (3.86 lb) |
| Fuse |
Use only 2 x 500 mA (FF) 1000 V |
| Safety protection |
The instruments meet Refer to safety warnings |
| EMC |
In accordance with IEC 61326 |
| Temperature coefficient |
<0,1% per °C up to 1 GΩ |
| Environmental | |
| Operating temperature range and humidity |
-10 to +55 °C |
| Storage temperature range | -25 to +70 °C |
| Calibration temperature | +20 °C |
| Maximum altitude | 2000 m |
| IP rating | IP54 |
| SKU | MIT485-EN |
|---|---|
| Manufacturer Part Code | 1004-742 |
| Model Ref | MIT485 |
| Country of Origin | United Kingdom |
