5 kV digital insulation tester

  • Insulation resistances up to 5 TΩ
  • Auto-range
  • Guard terminal
  • Digital & bargraph reading
  • Alphanumerical display
  • Programmable timer
  • Automated tests: absorption index and polarization index
  • Step voltage test
  • 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 TENTECH MD5060x is a smart, microprocessor-controlled, 5 kV insulation tester. Besides the conventional measurement of insulation resistances up to 5 TΩ, its 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 500 V up to 5 kV in 100 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. Nevertheless, the high-voltage generator is electronically stabilized with a better than 2 % accuracy in open-circuit condition and for any normal operation battery voltage.

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. Step voltage test, configurable pass / fail test 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. High security 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 MD5060x is powered by a rechargeable LFP battery and has an automatic charger that may be connected to 100 - 240 V mains supply (AC Adapter). The cabinet is strong and lightweight, easy to carry, impact-resistant and suitable to be used under severe weather conditions. Thus the megohmmeter supplies very reliable and accurate measurements both in laboratory and out in the field.


Test voltages

500, 1000, 2500, 5000 V directly, one button selectable.
500 V to 5 kV in 100 V increments. DC, negative.

Maximum resistance reading

5 TΩ @ 5 kV. 

Short circuit current

1.5 ± 0.5 mA. 

Test voltages accuracy

± 3 % of nominal test voltages on R ≥ 10 GΩ.

Insulation tester basic accuracy

± 5 % of reading from 1 MΩ up to 1 TΩ.
± 20 % of reading from 1 TΩ up to 5 TΩ.

Advanced features

Automated polarization index calculation.
Automated dielectric absorption ratio calculation.
Step voltage test.
Programmable pass / fail test.

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.

T-Logger software

Friendly, easy to use software. Tests are represented in graphical and tabular views. With automatic report generator, including the operator's commentaries.

Environmental protection

IP54 (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 12 V - 3000 mAh battery.

Battery charger

12 V - 2 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. 7.94 lb (3.6 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