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STM-XXG Multi-Electrode DC Spark Testers

The STM-10/20GF is the Clinton Instrument Company's Multi-Electrode DC spark tester, used for testing individual conductors during bunching and cabling operations. It can connect up to seven test modules with individual fault outputs for each channel. The STM-GF is available in 10kV and 20kV models.

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:

  • Individual testing of multiple conductors

  • Up to 7 test modules per control unit

  • Unique fault output for each channel



Test Voltage Range

STM-10GF - 1000v-10kV DC

STM-20GF - 1000v-20kV DC

Voltage Type


Voltage Display

3-1/2 digit LED 14.5mm display

Accuracy 2% of reading +/- 1 digit

Fault Indication

Control Unit - Each channel has an amber indicating lamp and onto-isolated latching output. The control unit has a common 3-digit electro-mechanical counter for a total fault count.

HV Test Module - Amber indication light mounted on chassis.

Fault Response

Less than 1 millisecond

Fault Resolution


Operating Modes

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

Detection Sensitivity

Less than 600uA at 5kV

Power Requirements

100-240VAC 49-61Hz    
Power supply is self-adjusting    

Process Control

Form “C” relay contacts rated 2 amps maximum for both NO and NC circuits.
Front panel or external reset. In non-latch modes closure time is adjustable from 12.5 milliseconds to 2.5 seconds.

Product Diameter (ro wire/cable)

1-inch wide electrode - Up to 0.75-inches
2-inch wide electrode - Up to 1.75-inches

Electrode Types

Bead chain, brush

Bead Chain Electrode Lengths

2-5 inches 

Compliant line speed with a 2-inch electrode

Up to 8000 feet per minute

Maximum compliant UL line speed with a 4-inch electrode


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