98x Teraohmmeter/Insulation Resistance (IR) Tester

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The 98x Series Teraohmmeter meets today’s demanding requirements for higher voltage IR (insulation resistance) testing.

In a never ending race for higher efficiency, electric vehicles and solar panel arrays are now operating with voltage rails up to 2.5 KV.  This is no place for a 1 KV tester, it’ time to step up to a Vitrek 98x!

Built upon the same DSP technology that has established Vitrek as a leader in hipot test systems, the 98xi devices feature a unique combination of performance features including:

  • Multi-dwell Functionality (multiple steps without having to return to zero between steps)
  • High-speed Testing (with dwell times as low as 100 ms)
  • Pico-Amp Leakage Measurement (with stable and precise 50 Teraohm IR readings)
  • Continuously Variable IR Test Voltage (adjustable over the full output range of the instrument)
  • Multi-mode Insulation Resistance Tests (three test modes – end on time, end on pass, end on fail)
  • Capacitance Test Modes (critical for solar panels, cable harnesses and other capacitive loads)

For applications requiring insulation resistance tests of multiple conductors, the Vitrek 98×1 IR Testers have the capability of directly controlling up to four 64-channel Vitrek 964i high-voltage scanners. Utilizing a PC equipped with Vitrek’s QT Enterprise™ software, the same instrument can handle up to 1020 test points.

Expanding the possibilities of High Voltage Resistance Measurement

The new 981i and 983i Teraohmmeters are designed to tackle the toughest High Resistance measurement applications. Demanding applications that most other IR testers won’t measure up to. So when it’s time to test higher voltage IR values like today’s electric vehicle systems and higher voltage solar arrays — look to Vitrek to deliver the IR tester you need for your production line.

What sets the Vitrek 98x Series IR testers apart from the others?
For starters, these units are based on Vitrek’s proven DSP technology — so they have the ability to work into capacitive loads where most others do not. And when it comes to output voltage range, Vitrek delivers — with up to 6.5 KVDC for the 981i and up to 11KV with the 983i.

Need to Perform an Insulation Resistance Test on a Multi-Conductor Cable Harness?
The 981i and 983i have the ability to directly control up to four 64 channel HV scanners, right out of the box. That is up to 256 test points and using a PC with Vitrek’s Q-Test software you can expand the count up to 1020 test points. The HV Switching System of choice is the Vitrek 964i, which can hold eight 8-channel switching cards — available in 7, 10 and 15KV ratings.

In a never ending race for higher efficiency, electric vehicles and solar panel arrays are now operating at 2.5KV.
This is no place for a 1KV tester, it’s time to step up to a 98x!

Product Features and Benefits

  • Highest Range of IR Test Voltage — Choose from 6.5KVDC or 11KVDC maximum output
  • Fast IR Readings — High speed output control with Dual Coldfire microprocessors and Dual DSPs to provide dwell times as low as 100ms
  • High Resistance Measurement Range — Transfer measurement up to 150 Teraohms
  • Expansive Test Sequency Memory holds up to 100 tests with up to 254 steps per insulation resistance test. Tests can be selected via front panel, Ethernet, RS232 or with optional GPIB
  • Multi-Dwell Functionality — permits dwells at different voltage levels without having to return to zero between test steps – dramatically simplifying advanced analysis of dielectric properties
  • Ethernet, RS232, Digital I/O & Scanner Control — All standard interfaces – Provides the highest level of test automation. GPIB available
  • Pico-Amp Leakage Measurement ensures that even the lowest leakage current levels are accurately detected and 150 Teraohm transfer and 50 Teraohm IR readings are stable and precise
  • Test Specific Fixture & Cable Compensation — Automatically calibrate out offset errors caused by test fixture insulation resistance and capacitive and leakage
  • Multi-Mode IR — Values up to one Teraohm or more can be obtained with precision in your choice of 4 IR test modes – end on time, end on pass or end on fail or steady or rising
  • Continuously Variable Insulation Resistance Test Voltage — Unlike many IR testers which limit you to 3 or 4 discrete test voltages, the 981i allows you to select the test voltage you need from 30V to 6.5KV with 1 volt resolution. The 983i provides outputs from 60V to 11KV
  • Capacitive Loads — The 981i & 983i are specified for use with capacitive loads, most IR testers are not. This means the 981i & 983i are exceptional at performing IR tests on cabling PV panels and CMC devices
  • Measure IR on Grounded Loads — Some DUTs cannot be isolated from earth ground, add option HSS2 to make precise IR measurements on grounded loads
  • Light Weight Design — Better reliability, easier on your back. Compare the 4.5 kg 981i/983i to whatever you’ve been using. Vitrek delivers superior performance in a smaller, lighter footprint
  • 3 Year Extended Warranty — 1 year standard, total of 3 years extended warranty with registration and annual factory calibration. Built-in reliability you can count on for years to come
  • Safety Tested per EN 61010-1. EMC compliant to EN 61326-1
  • Manual Test Mode — Allows for variable voltage output during testing with continuous measurements and pass/fail indiciation until the user stops the test
  • Made in the U.S.A.


General Specifications

Specifications: Valid after 15 minute warm-up, for 1 year from last external calibration, and for ambient temperature within +/- 2 Degrees C of last performed ZERO operation.

Ethernet: High speed, high noise immunity LAN interface
RS232 Interface: Selectable baud: 9600, 19200, 38400, 57600 or 115200, full handshake
VICL Interfaces: Provided for control of HV Scanners
Digital I/O Interface: Provides 4 digital inputs and 5 digital outputs. Functions include, Start/Stop, Testing, Pass/Fail, HV Present, Safety Interlock, Dwell Timer
Optional GPIB: Option GPIB-9 adds GPIB interface capability
Operating Temperature: 0°C to 50°C
Humidity: <85% RH (non-condensing)
Power: 105-265Vrms, 45-65Hz, 500VA Max
Dimensions: 89mm H x 432mm W x 457mm D (3.5″ H x 17″ W x 18″ D)
Weight: 5Kg (11 lb.) Net / 7Kg (15 lb.)
Accessories: Alligator test leads, NIST traceable calibration certificate with no data, power cord and operator’s manual. Limited ISO 17025 cal cert with data & uncertainties available.

DC Output Voltage

981i: 30V to 6500V
Accuracy: +/- (0.25% rdg + 0.1V)
981i with option HSS2: 30V to 5000V
Accuracy: +/- (0.25% rdg + 0.1V+1V/mA)
983i: 60V to 11000V
Accuracy: +/- (0.25% rdg + 0.2V)
Output Resolution: 1V
Loading: up to 4mA charging, 2mA continuous

Current Measurement

981i & 983i RETURN current only, 1pA to 4mA
Accuracy (Resistive Load up to 1000pF): +/- (0.5%rdg + 10pA + 2pA per kV))
Accuracy (Capacitive Load 1000pF to 50nF): +/- (0.5%rdg + 100pA + 20pA per kV))
Accuracy (Capacitive Load >50nF): +/- (0.5%rdg + 1nA + 200pA per kV))

Option HSS2 HV Output current, 1nA to 4mA (for grounded loads)
Accuracy (Resistive Load up to 1000pF), C<1000pF): +/- (0.5%rdg + 5nA + 1nA per kV)) Accuracy (Capacitive Load 1000pF to 50nF): +/- (0.5%rdg + 7.5nA + 2.5nA per kV)) Accuracy (Capacitive Load >50nF): +/- (0.5%rdg + 10nA + 5nA per kV))

Resistance Measurement
NOTE: the use of the OFFSET (or ZERO) capability in either AUTO or MANUAL TEST modes is not required to meet these specifications – the OFFSET capability is intended to allow the user to offset externally produced leakages.

Transfer Measurement

Comparative Measurement Capability (measurement of multiple values within 10% at the same test voltage, in the same environmental conditions within +/-1C, within a 1 hour period, with no intervening ZERO operations, and constant power)

Uncertainty (Resistive Load): +/- (0.05%rdg + (R/(5Tohm per kV))%rdg + (1/V)%rdg + 2ohms per kV) for R < 150Tohm


Charge Time: 1 second minimum charge time, 9999 sec max.
Dwell Time: 0.1s to 9999 days, 0.1 sec resolution

Ordering & Accessories

Below prices in US$ are for destinations in North America with terms of prepay, net 30 days (OAC) and accepted credit cards. For shipment beyond North America or terms beyond 30 days, please contact the factory for a quotation. If you require rush/expedited shipment please contact Vitrek at (858) 689-2755 or email info@vitrek.com

98x IR Tester

ThumbnailNameShort descriptionPriceBuy
vitrek 98x hipot tester981i981i 6.5KV Teraohmmeter/IR Tester$5,995.00

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vitrek 98x hipot tester
vitrek 98x hipot tester983i983i 11KVDC  Teraohmmeter/IR Tester, includes TL-980 and NIST traceable Calibration certificate.$6,995.00

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vitrek 98x hipot tester
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98x IR Tester Accessories

ThumbnailNameShort descriptionPriceBuy
98X-230VFactory Set 230V Line Operation. Order this no charge option when powering the unit from 210-250VAC.$0.00

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95X-230VFactory Set 230V Line Operation. Order this no charge option when powering the unit from 210-250VAC.$0.00

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vitrek QT enterprise software logoQTE-9QT Enterprise Sofware License Key for use with 98x an 95x products.$1,615.00

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vitrek QT enterprise software logo
vitrek 98x hipot tester ungrounded DUTTL-980TL-980 Standard Test Lead Kit for 98x Insulation Resistance (IR) Tester$284.00

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vitrek 98x hipot tester ungrounded DUT
HSS-2DUT Isolation Option. Option HSS-2 adds the ability to measure DC breakdown and/or leakage into a grounded DUT with higher resolution than HSS-1. Maximum current capabilities are further reduced. (This option may be fitted in a 951i, 952i, or 956i Hipot Tester or 981i Teraohmmeter/IR Tester)$851.00

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RFS-95Remote Start Foot Switch$221.00

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GPIB-9Optional GPIB Interface$562.00

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RM-1Rack Mount Kit$85.00

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The 98x Series Teraohmmeter/IR Tester and accessories are available for rent. Please contact the factory for a rental quotation on the items and period of time you desire. Vitrek offers a generous rental allowance for rentals that are converted to a purchase and rentals of 12 months come with a 10% buyout.

98X Series Downloads

Download Data Sheet
Download Manual
Download QTE Enterprise Software – FREE 45 Day Trial

*At the end of your FREE 45 day trial of QT Enterprise software, you must purchase a Software License Key for the appropriate products the software is being used with.  See ordering information or contact Vitrek for details at info@vitrek.com (858) 689-2755.