1 kV digital insulation tester

  • Insulation resistances up to 1 TΩ
  • Auto-range
  • Guard terminal
  • Digital & bargraph reading
  • Alphanumerical display
  • Programmable timer
  • Automated tests: absorption index and polarization index
  • Programmable pass-fail
  • Real time clock and calendar
  • Built-in printer
  • 4000 readings memory
  • USB interface
  • Rechargeable LFP battery
  • Auto power-off
  • Software for data management


The MD1035x is a smart, microprocessor-controlled, 1 kV insulation tester. Besides the conventional measurement of insulation resistances up to 1 TΩ, its advanced features allow to automatically measure both the polarization index and dielectric absorption index, thus significantly simplifying testing of transformers.

This insulation tester is a portable, battery-powered equipment. Test voltage may be chosen from 100 V to 1 kV in 50 V increments. Due to its measurement principle (actual voltage and current readings) the accuracy of resistance measurement is not affected by any test voltage error.

The built-in chronometer automatically counts the elapsed time since the start of measurement. Measured values are transmitted through the USB interface and are printed in the built-in printer as a registration of the performed test. Furthermore, the measured values are stored in a non-volatile internal memory. Up to 4000 measured values may be stored, to be transferred afterward to a computer running the T-Logger program. This software allows a further analysis of the test results, including a graphical representation and automatic report generation. The real time clock and calendar, and the sequential test number, facilitates the identification of each test, and the organization of a predictive maintenance system by trend analysis.

Some other advanced features are useful to run the most sophisticated insulation analysis. Configurable pass-fail and timed measurements are automatically performed, with a very simple and user-friendly setup. The measurement parameters are stored in the non-volatile memory for an easy configuration.

In order to guarantee the operator safety, the cabinet is made of a high breakdown strength plastic. Output terminals are placed in the furthest and most protected area of the equipment. A light indicator shows high-voltage presence and is switched-off when the capacities (both internal and external) are discharged up to reaching a safe value.

The MD1035x is powered by a rechargeable LFP battery and has an automatic charger that may be connected to 100 - 240 V mains supply (through an AC Adapter). The cabinet is strong and lightweight, easy to carry, impact-resistant and suitable to be used under severe weather conditions. Thus the instrument supplies very reliable and accurate measurements both in laboratory and out in the field.


Test voltages

100 V, 250 V, 500 V, 1000 V directly, one button selectable.
100 V to 1 kV in 50 V increments. DC, negative.

Maximum resistance reading

500 GΩ @ 100 V up to 500 V.
1 TΩ @ 525 V up to 1,000 V.

Short circuit current

1.5 ± 0.5 mA.

Test voltages accuracy

± 3 % of nominal test voltages on 10 GΩ.

Equipment basic accuracy

± 5 % of reading ± 3 digits.
(1 MΩ to 500 GΩ at any test voltage).

Advanced features

• Automated polarization index calculation.
• Automated dielectric absorption ratio calculation.
• Programmable pass-fail test.
• Programmable timer.

Built-in printer

Prints elapsed time, actual voltage and resistance measured each 15 seconds.

Built-in memory

Stores up to 4000 measured values.



Built-in chronometer

Shows elapsed time in mm:ss format. Count starts automatically for each measurement.

Real time clock and calendar

Allows a reliable identification for each test.

Environmental protection

IP65 (with closed lid).

Safety class

In accordance with IEC 61010-1.


In accordance with IEC 61326-1.

Electrostatic immunity

In accordance with IEC 61000-4-2.

Electromagnetic irradiation immunity

In accordance with IEC 61000-4-3.

Power supply

Internal rechargeable LFP battery (LiFePO4 12 V - 3000 mAh).

Battery charger

12 V - 2.0 A.

Operating temperature range

14 °F to 122 °F (-10 °C to 50 °C).

Storage temperature range

-13 °F to 158 °F (-25 °C to 70 °C).

Humidity range

95 % RH (non condensing).

Equipment weight

Approx. 5.95 lb (2.7 kg).


10.78" x 9.84" x 4.88" (274 x 250 x 124 mm).

Included accessories

2 Measuring test leads.
1 GUARD test lead.
1 AC Adapter.
1 T-Logger software (CD-ROM).
1 User guide.
1 Protective bag.
1 USB cable.

Rechargeable battery (LiFePO4)

Expected lifetime
2,000 charge / discharge cycles (average).

Low self-discharge
When the equipment is not in use, battery charge decreases with time at a much lower rate than other battery technologies.

In contrast to other lithium battery technologies commonly used, LFP batteries are thermally and chemically stable, significantly improving battery safety.
Company history
13 Years


Customer service
Phone: +1 305 938 0389

Phone: +1 305 938 0389