5 kV digital insulation tester

  • Insulation resistances up to 5 TΩ
  • Automated tests: absorption index, polarization index, capacitance, leakage current and AC/DC voltmeter
  • Step Voltage Test
  • Real time clock and calendar
  • Built-in printer
  • 4000 readings memory
  • Software for data management


The digital insulation tester model MD5075x is TENTECH's cutting edge insulation analyzer equipment and it is one of the most complete and sophisticated available in the international market. A software allows for further analysis of tests results, including features such as graphical representation and automatic report generation. Its proven technology provides safe, reliable and accurate measurements of insulation resistances up to 5 TΩ, with 4 pre-selected test voltages: 500 V - 1 kV - 2.5 kV - 5 kV. Other test voltages may be selected in steps of 25 V, 100 V or 500 V.

A state-of-the-art microprocessor controls the equipment operation and enables the incorporation of advanced features which make measurements easier: auto-range selection, AC/DC voltmeter, automatic measurement of absorption index, polarization index, leakage current and capacitance, timer enabling programming of test duration, configurable pass-fail test, step voltage test, built-in printer, real time clock and calendar.

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 measurements 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.

The MD5075x is powered by a rechargeable LFP battery. The cabinet is strong and lightweight, easy to carry, impact-resistant and suitable to be used under severe weather conditions. Thus the insulation tester supplies very reliable and accurate measurements both in laboratory and out in the field.


Test voltage

500 V, 1,000 V, 2,500 V, 5,000 V directly, one button selectable.
250 V to 5 kV in 25 V, 100 V or 500 V steps. DC, negative.

Maximum resistance reading

5 TΩ @ 1 kV up to 5 kV.
1 TΩ @ 500 V up to 1 kV.
500 GΩ @ 250 V up to 500 V.

DC Voltmeter

10 V up to 1000 Vdc.
Accuracy: ±(5 % of reading + 3 digits).

AC voltmeter

10 V up to 1000 Vrms.
Accuracy: ±(5 % of reading + 3 digits).

Overvoltage category

CAT III - 600 V.

Leakage current measurement

1 nA up to 3 mA
Accuracy: ±(10 % of reading + 3 digits).

Capacitance measurement

50 nF up to 10 µF @ 500 V.
50 nF up to 5 µF @ 1,000 V.
30 nF up to 2 µF @ 2,500 V.
30 nF up to 1 µF @ 5,000 V.
Accuracy: ± 10 % of reading ± 3 digits.

Short circuit current

Max. 3 mA.

Test voltage accuracy

± 3 % of nominal test voltages on 10 GΩ.

Insulation tester basic accuracy

± 5 % of reading from 1 MΩ up to 1 TΩ @ 5 kV.
± 20 % of reading from 1 TΩ up to 5 TΩ @ 5 kV.
(for lower test voltages, the upper limit will be reduced proportionally).
± 20 % of reading from 10 kΩ up to 100 kΩ.
± 10 % of reading from 100 kΩ up to 1 MΩ.

Advanced features

• Automated polarization index calculation.
• Automated dielectric absorption ratio calculation.
• Programmable pass-fail test.
• Step voltage test.
• 4,000 readings memory.
• Switchable filter to remove external noise interference.

Built-in printer

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



Built-in chronometer

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

T-Logger Software

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

Environmental protection

IP65 (with closed lid).

Safety Class

In accordance with IEC 61010-1.


In accordance with IEC 61326-1.

Electromagnetic irradiation immunity

In accordance with IEC 61000-4-3.

Electrostatic immunity

In accordance with IEC 61000-4-2.

Power supply

Internal rechargeable (LiFePO4 12 V - 6000 mAh).

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 % UR (non condensing).

Equipment weight

Approx. 9.48 lb (4.3 kg).


13.39" x 11.62" x 5.98" (340 x 295 x 152 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
Fax: +1 786 401 7165

Phone: +1 305 938 0389