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Model 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.

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

SKU: DC 4120A-0 Category:


A front panel feature, unique to the Amblyonix Model 4120A, 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: 43 lbs.
Power supply: 120 VAC ±10%, 60 Hz
Dimensions: 15.5″ x 22.75″ x 8.5″
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 fully 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


  • 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 High Voltage Cylinder, Interconnecting Cable, High Voltage Cable, HV Microammeter, Current Limiting Resistor, Ground Cable,
Discharge Rod, Power Cord, Spare Fuse, Line Cord and Manual.

1-year parts and labor warranty.

Additional information

Weight 45 lbs
Dimensions 17 × 24 × 9.5 in


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