Tera Ohm


5 kV Automated Insulation Resistance Tester

Model TeraOhm

  • Ultra high Insulation Resistance measurement up to 5TΩ
  • Polarization Index (PI) measurement with programmable timer
  • Voltage, Frequency and Capacitance measurement Storage of 1000 test results in memory, that can be downloaded to a PC
  • Large, backlit LCD display


The TeraOhm is an ultra high range insulation resistance testing instrument. With an output voltage of up to 5000 volts DC the TeraOhm will measure up to 5T (5,000,000 Meg ).

The test voltage can be selected in increments of 50 volts.The duration of the test can be set by the operator. At the end to the test period, the sample is automatically discharged and the insulation resistance is indicated on the display.

Polarization Index tests can also be automatically conducted. At the end of the ten minute period, PI is automatically calculated and up to 1000 results can be stored in the instrument. These results can easily be recalled or can be transferred to a PC using the optional windows software TeraLink+.

The instrument can also be used to measure capacitance up to 50 uF, voltage up to 600 VAC or VDC, and frequency.

The standard instrument is supplied with rechargeable batteries, a calibration certificate and a soft sided carrying case. Batteries recharge using a “ built-in” charger.


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Product Description


  • Ultra high Insulation Resistance measurement up to 5T
  • Polarization Index (PI) measurement with programmable timer
  • Dielectric Discharge Ratio (DD)
  • Voltage, Frequency and Capacitance measurement
  • Withstand voltage to 5000V
  • Automatic discharge to safe voltage level
  • IR Testing up to 5,000V in 50V steps with actual test voltage display
  • 1000 memory locations for test results, and isolated RS232 output
  • Real time clock and programmable timer
  • Large, backlit LCD display
  • Double insulated


Insulation test 0.01MΩ to 5T Ω, ±5% accuracy
DC Test Voltage 250 to 5000V in 50V steps. Actual test voltage display, ±3% accuracy
Test Current > 1 mA, 5W max.
Voltage Measurement 0 to 600V AC or DC, ±3% accuracy
Frequence Measurement 45-65 Hz, ±0.2Hz
Withstanding Voltage 0 to 5000V, 0 to 1.4mA, ±3% accuracy
Capacitance 0 to 50 uF, ±5% accuracy
Polarization Index (PI) 0 to 99.9, ±5% accuracy
Dielectric Discharge (DD) 0 to 99.9, ±5% accuracy
Protection Double insulation, CAT III 600V, Pollution degree 2
Power 6 “ C” size rechargable batteries, 115 or 230 VAC
Dimensions 265 x 110 x 185mm, 2.3kg
Optional Accessories Windows Software with RS232, 5KV Leads, Case

Standard accessories as shown include:

  • Test Leads
    • Red, black and green, 6 foot
    • Large Aligator clips
    • Test probes
    • Power cord
  • Rechargeable batteries
  • Soft sided case
  • Instruction manual

Optional accessories as shown (in brochure) include:

  • Windows Software TeraLink+
  • RS232 interconnecting cable
  • 5 kV test leads 
  • 5 kV insulated Aligator clips
  • Hard carrying and transport case (not shown)

*Specifications subject to change without notice



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DISCLAIMER: The technical information contained herein is the result of extensive testing in the manufacturer’s laboratories. In addition any application advice given verbally, in writing or by testing corresponds to the best of our knowledge and belief. Since the use and application of any of our products lies beyond our area of control, it remains the responsibility of the user to verify the product’s suitability for their application.

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