Introducing the 4120A DC Dielectric Test Set

Since most electrical equipment problems are caused by insulation breakdown, regular testing is a key component in identifying potential issues before they become catastrophic failures. Featuring the latest in pulse width modulation technology, the Model 4120A employs a high frequency power source and feedback circuits to produce a stable, high voltage output with low ripple.

Model 4120 DC Dielectric Tester

Model 4120 DC Dielectric Tester

High-frequency and high-voltage rectifier diodes make the cylinder compact and lightweight and result in an extremely efficient device. The complete set weighs under 45 lbs!


  • Pulse width Modulation (PWM) technology
  • Stable, high-precision voltage adjustment
  • Comprehensive nanosecond threshold protection
  • Unique Metal oxide test function
  • Adjustable overvoltage protection feature
  • Current limiting resistor for capacitive load testing
  • Shielded HV micro-ammeter accessory
  • Shorting rod for grounding output after testing

For complete details, see