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.
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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
+/- 3% FSD (true negative peak indication).
Impulse Wave Form
Negative pulse with an exponentially dampened sinusoid.
(10% to 90%) 10 +/- 2 microseconds
Less than 80% of initial negative amplitude.
Impulse Repetition Rate
250 +0/-2% Impulses Per Second
Resistance connected from electrode to ground required to register a fault; 500kOhm minimum
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
4-digit counter with manual reset
Continuous high voltage / Remove voltage on fault
Momentary relay closure on fault / latched relay closure on fault until reset
120 Vac 50/60Hz, 240 Volts Optional
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
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