The MIT485/2TC-LG2 insulation and continuity tester replaces the original MIT480 range and is designed specifically for the Telecommunications and Cable testing markets. The tester features a redesigned case, back-stand, and 6 cell battery compartment with separate fuse access. The instrument is over-molded for increased protection and achieves an IP54 weatherproof rating. Designed to be exceptionally safe to use, fast detecting circuitry prevents damage to the instrument if accidentally connected to live circuits or across phases.

Three Terminal Connection

Three terminal measurement permits the connection of all three test leads for Tip, Ring and Grounds. The measurement pair is selected from the T-R-G button on the front panel. Selection is confirmed in the display. No disconnection of test leads to measure individual pairs are required.

Insulation Resistance Testing

The feedback controlled insulation test voltage is now accurate to +2% -0% compared to the original +20%, providing a more accurate test voltage without the risk of over-voltage damage to circuits. A variable range allows the exact test voltage to be selected from 10 V up to 500 V.

Features Include:

• Test voltages - 50 V, 100 V, 250 V, and 500 V

• Variable test voltage - Adjustable test voltage from 10 V to 500 V

• 2% test voltage accuracy - Output test voltage is maintained within tolerance or -0% +2% +2 V

• PASS/FAIL indication - PASS or FAIL displayed depending on threshold voltage

• Stabilized test voltage - Voltage is feedback controlled to ensure it remains within specification throughout full test range

• Test voltage display - Actual test voltage is displayed on smaller digital readout, with measurements shown on larger digital display

• Test range - Insulation testing up to 100 GΩ @ 500 V

• Measurement range displayed - Test range is displayed during selection

• Measurement voltage display - Measurement voltage is displayed during test

• Analog arc - Display features analog arc to replicate response of a moving coil display

• Timed testing - Automatically test to a time limit

• Silicone leads - Flexible silicone test leads are comfortable to use and prevent measurement errors on GΩ ranges above 5 GΩ

• Test inhibit - Prevents testing if voltages in excess of 25, 30, 50, 75 or 100 V (set by the user) are detected when making insulation tests (default is 50 V)

• Insulation buzzer - Buzzer can be set to buzz if the insulation resistance is above user adjustable limit

• Test Lock - Holds insulation test on continuously

• Test ranges extend from 10 GΩ to 100 GΩ depending on test voltage as below:

• 50 Volts up to 10 GΩ

• 100 Volts up to 20 GΩ

• 250 Volts up to 50 GΩ

• 500 Volts up to 100 GΩ

Continuity (Resistance) Testing

• Single resistance range - One range fully automatic from 0.01 Ω to 1.0 MΩ

• 200 mA or 20 mA - Either 200 mA or 20 mA continuity test currents are available

• Lead null - Lead resistance compensation (NULL) operates up to 10 Ωs of resistance

• Buzzer - ON/OFF selected by simple push button

• Buzzer limit - Continuity buzzer limit alarm provides adjustment of the maximum resistance that the continuity buzzer sounds

• Differential measurement - Allows difference between two consecutive continuity tests to be measured

• REN - Displays appropriate REN value for circuit under test (avaliable on 100 V ins or continuity range)

Voltage Measurement

• True RMS voltage measurement to 600V AC or DC with resolution from 0.1 mV

• Digital voltage measurement up to 600V AC/DC

• Analog arc measurement to 600V AC/DC

• Automatic display of frequency during voltage measurement

• Input impedance is 10 MΩ to prevent loading circuit and reporting low voltages

Current Measurement

• 0 to 400 mA AC/DC

Variable Insulation Voltage Tester

The variable mode provides a unique solution for awkward insulation voltage measurement applications. The range option allows an insulation test voltage from 10V to 500V in 1V steps.

Storing and Downloading Results

Revised Bluetooth and pairing procedures have made the MIT485/2TC far easier to pair and download data. The test results are downloaded to a CSV file, which can then be opened as an Excel spreadsheet.