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Model 4120 DC Dielectric Strength Tester


DC hipot (over-potential) testing is typically performed when commissioning new installations. It is also used on transformers to verify integrity after a repair.  Featuring the latest in pulse width modulation technology, the Model 4120 employs a high frequency power source and feedback circuits to produce a stable, high voltage output with low ripple.

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

Available on backorder

SKU: DCD4120-0 Category: Tag:


A front panel feature, unique to the Amblyonix Model 4120, allows the operator to test Metal Oxide Arresters quickly and accurately. Also provided is a high-voltage DC micro-ammeter used 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