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IT-25B Impulse Spark Tester

The IT-25B is the Clinton Instrument Company's Impulse Spark Tester designed as an alternative to the wet dielectric test. It is primarily used when testing wire to specifications that have not adopted the high frequency spark test such as MIL-C-13777E, MIL-W-16878D, and some NEMA specifications.

Downloads & Questions

We often provide our spec sheets and manuals in multiple languages. Contact us to let us know what you need, and we will get it to you!

Technical Specifications

Major Features:

  • Impulse Spark Tester

  • Regulated Output Voltage,

  • Process Control Output



Test Voltage Range

3-15kV, 3-25kV (negative peak volts)


Line +/- 1% for line voltage 105-135v with 25pF load
Load Less than 500v decrease from 25pF to 50pF load

Voltage Metering

+/- 3% FSD (true negative peak indication).

Impulse Wave Form

Negative pulse with an exponentially dampened sinusoid.

Rise Time

(10% to 90%) 10 +/- 2 microseconds

Positive Overshoot

Less than 80% of initial negative amplitude.

Impulse Repetition Rate

250 +0/-2% Impulses Per Second

Detection Sensitivity

Resistance connected from electrode to ground required to register a fault; 500kOhm minimum

Dynamic Response

Fault registration when a single impulse arc occurs between 1/2” ball electrodes connected from the high voltage terminal to ground

Repetitive Fault Counting Rate

20 per second maximum

Fault Indication

4-digit counter with manual reset

Operating Modes

Continuous high voltage / Remove voltage on fault    
Momentary relay closure on fault / latched relay closure on fault until reset

Power Requirements

120 Vac 50/60Hz, 240 Volts Optional

Relay Outputs

Form C relay contacts, 5 amperes    
Pinhole Alarm, Bare Wire Alarm, Voltage Watchdog, Cover Open, Pinhole/Bare Wire Count Limits, etc.

Product Diameter (round wire/cable)

Up to 2-inches

Electrode Types

Bead Chain, Brush

Bead Chain Electrode Lengths

2-inches or 4-inches

Maximum line speed which allows 2 test pulses within a 2-inch electrode.

Up to 1,250 feet per minute

Maximum line speed which allows 2 test pulses within a 4-inch electrode.

Up to 2,500 feet per minute

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