Products / Additional Products / Model 4120 DC Dielectric Strength Tester

Model 4120 DC Dielectric Strength Tester

The instrument utilizes a high frequency voltage doubling circuit, with the latest PWM pulse width modulation technology. Double closed loop feedback technology improves load regulation rate, so voltage stability is very high and ripple is low.

High-frequency and high-voltage rectifier diodes make the cylinder compact and lightweight, resulting in an extremely efficient device.

SKU: DCD4120-0 Category: Tag:


Featuring the latest in pulse width modulation technology, the Model 4120 employs a high frequency power source and voltage/current feedback circuits to product a stable, high voltage output with low ripple. A front panel feature, unique to the Model 4120 allows the operator to test Metal Oxide Arresters quickly and accurately. Another feature that is as unique as it is useful is a high-voltage dc micro-ammeter use to test leakage currents on the high-voltage side of the insulation testing circuit.


Rated voltage: 120 kVDC
Rated current: 5 mADC
Rated power: 360 W
Weight: 22 lbs.
Power supply: 120 VAC ±10%, 60 Hz
Dimensions (Control Unit): 16.25″ x 15.5″ x 7.5″
Output voltage accuracy: ±(1.0% reading, ±2 digits)
Output current accuracy: ±(1.0% reading, ±2 digits)
Ripple factor: ≤0.5%
Working mode: Intermittent use, 30 minutes under rated load
Overload Voltage: The no-load voltage can exceed the rated voltage 10% for 10 minutes.
Overload Current: The maximum charge current is 1.25 times of the rated current.
Operating environment: Temperature 14°F to 104°F
Humidity: To ≤85%RH for temperatures under 77°F, non-condensing
Altitude: Under 4,900′


  • 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

Supplied with manual and power cord.

1-year parts and labor warranty

Additional information

Weight 38 lbs
Dimensions 60 × 20 × 14 in