Vitrek Dielectric Tester

Model: 944i

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AC & DC Hipot plus insulation resistance and earth continuity all in one GPIB automated tester.

The Vitrek 944i combines AC dielectric strength testing (AC Hipot) with DC dielectric strength testing (DC Hipot), insulation resistance (to65 Gigohms) and earth continuity measurement all in one feature-rich automated instrument. This compact dielectric analyzer lets you measure four electrical safety test parameters from a single test connection-all with the touch of a button.

The Vitrek 944i delivers top performance and versatility for manufacturing test, product safety engineering, component evaluation, as well as research and development applications. You’ll find that the multi-function 944i is loaded with features that even the larger more expensive dedicated testers don’t offer. Powerful features including-Automatic calibration, built-in diagnostics, internal “watchdog” safety monitor, user memory for up to 100 test routines, arc detection and available interface package with IEEE-488.2, RS-232 and direct test results printout capability.

The intelligent choice for operator safety

The 944i with a high-impact injection molded front-end with no exposed metal parts to present a potential user shock hazard. We put in an internal “watchdog” safety monitor which automatically shuts down the output in the event of an inadvertent disconnect. And the Vitrek 944i boasts an impressive user programmable “Arc Detection” circuit, capable of shutting down the high voltage system within microseconds.

For added peace of mind the onboard diagnositcs of the 944i execute a complete check of all safety systems every time you power up.

World Class technology means reliability you can depend on

The Vitrek 944i provides increased performance and reliability when compared to discrete testers. Extensive use of ASIC, PAL and built-in test technologies make possible this high level of functionality with far fewer components than existing instruments.

Powerful yet easy to use

We’ve harnessed the power of the microprocessor to make this dynamic instrument simple and easy to operate. Specifically, the extensive use of menu prompting walks you through the test setup. Built-in user memory allows you to store, recall and edit up to 100 different test programs. All test parameters are fully user selectable-no hidden switches or pots to hamper operation.

The result is a clean, streamlined panel design that demands noticeable less effort to operate – and the unrivaled power to execute customized test routines at the touch of a button.

Capacity to excel

With its full 35mA sourcing capability, the Vitrek 944i possesses the horsepower required to drive today’s capacitively filtered circuits – loads which the 10mA to 25mA units just can’t handle. Yet, what sets the 944i apart from the rest is its ability to discriminate between in-phase and out-of-phase leakage currents.

This advanced feature enables you to measure the resistive current associated with insulation breakdown, the reactive component or the combination of both.


  • AC & DC Hipot plus Insulation Resistance and ground continuity in a single feature rich compact instrument
  • AC/DC Hipot to 5VK standard, 7 and 10 KVDC optional
  • Easy to use full menu prompting, walks you through the test set-up
  • Test database stores 200 test steps for easy recall
  • Powerful 35mA Sourcing capability
  • On-board phase detection measures “total”, “real” or “imaginary” leakage current
  • Continuous Output frequencies from 50 to 100Hz
  • IR measurement to 65Gig ohms
  • Continuity measurement to 1 milli-ohm
  • Leakage current measurement to 1 nano-amp
  • Optional IF-4 Interface package includes GPIB, RS232, VICL & Printer Ports
  • Separate Ramp & Dwell, Min & Max current limits
  • Covers-on Automatic Calibration
  • Built-in controls for HV scanner and Ground Bond Tester
  • CE Mark Certified to EN61010
  • Includes NIST Traceable Certification
  • Three year extended warranty
  • Made in the USA

AC Dielectric Mode
AC Voltage Output

Range Current Accuracy
100 to 500 VAC 20 mA 0.7% of output + 7.5V
500 to 5000 VAC 35 mA 0.7% of output + 30V

Output Frequency: 50Hz to 100Hz with 1Hz resolution independent of line power frequency.
Output Waveform: Digitally synthesized, low distortion sinewave.

AC Current Sensing (AC Leakage)

Range Current Accuracy
13.00uA 10nA 0.5% of reading + 1uA
1.300mA 1uA 0.5% of reading + 10uA
40.0mA 100uA 0.5% of reading + 500uA

Current Sensing: Resistive current (in-phase), reactive current (out-of-phase) or total current.
Voltage Coefficient: 100pA/V

DC Voltage Output

AC Current Sensing (AC Leakage)

Range Current Accuracy
100 to 500 VDC 20mA 0.3% of output + 6V
500 to 5,000 VDC 35mA 0.3% of output + 25V
5,000 to 7,000 VDC* 5mA 0.3% of output + 75V

Requires option *DC-7

DC Voltage Output with option DC-10
500 to 10,000 VDC 5mA 1% of output + 50V

DC Current Sensing (DC Leakage)

Range Current Accuracy
1.800uA 1nA 0.4% of reading + 6nA
18.00uA 10nA 0.3% of reading + 30nA
1.800mA 1uA 0.3% of reading + 30uA
40.0mA 10uA 0.3% of reading + 300uA

Voltage Coefficient: 15pA/V

(Insulation Resistance)

Resistance Range Minimum Resistance Test Voltage
2.6 GΩ 100 KΩ 100 VDC
13 GΩ 500 KΩ 500 VDC
26 GΩ 1 MΩ 1,000 VDC
65 GΩ 2.5 MΩ 2,500 VDC

Accuracy: Combined uncertainty of DC Voltage Output + Current Measurement Accuracy

(Earth Continuity)

Full Scale 8.5 ohms maximum including lead resistance.
Resolution 1 milli-ohms
Test Current 50 mA
Lead Compensation Automatic offset circuit “nulls” out two wire lead resistance
Accuracy 0.3% of reading + 30mΩ (up to 5Ω)

General Specifications

Arc Detection Sensitivity User selectable 3 microseconds to 30 microseconds
Display 40 character alphanumeric vacuum fluorescent
High Voltage Indicator Lightning bolt illuminated by independent output voltage monitor. Audible alarm sounds prior to voltage output.
Voltage Resolution 1 volt AC or DC
Dwell Time Accuracy +2 Seconds/minute, -500mS/minute
Slew Rate 10 Volts/second to 1999 volts/second, user selectable
Limits 10 Volts/second to 1999 volts/second, user selectable
Limits Test automatically aborts when digitally stored minimum or maximum limit is exceeded.
Remote Interface Option “IF-4” GPIB – IEE-488.2 Subset compatible
RS232C – 1200, 2400, 4800, 9600 Baud rate selectable
Parallel – IBM/Centronics compatible
VICL – Vitrek auxiliary unit control loop
Accuracy Stated specifications are bipolar and apply for one year within “5EC from calibration temperature (20 to 25EC).
Temperature Coefficient 0.1 times stated accuracy per EC beyond calibration temperature window
Calibration Traceable to the National Institute of Standards and Technology (NIST). Automatic “Covers on” calibration, internal or external. Calibration constants stored in non-volatile memory.
Warm up Time 30 minutes
Operating Temperature 0°C to 50°C
Humidity 90% RH, 0° to 40° C
Power 115/230 VAC + 10%, 350 VA Max
Dimensions 89mm H x 432mm W x 457mm D (3.5″ H x 17″ W x 18″ D
Weight 14Kg (34 lb.) Net / 18Kg (40 lb.) shipping