Impulse Winding / Surge Tester - 7720


  • 200 V to 5 kV production testing of manufactured components
  • Non-destructive analysis of winding
  • One button go / no-go testing
  • Multi Winding
  • Identifies faulty manufacture without damaging components
  • Straightforward intuitive operation
  • Corona \ flutter testing
  • Built in statistical analysis
  • Low cost for economical tests
  • 2,4,6 & 8 port versions

High voltage non-destructive analysis of winding identifies difficult to detect manufacturing faults

There are a number of parameters that can change during manufacture that may affect the performance of a winding. These parameters, which cannot always be measured with an LCR meter, include change in material as well as shorted and damaged windings.

The 7720 Impulse Winding Tester uses a very high voltage impulse to stimulate the device under test (DUT).  It analyzes the decay waveform to detect changes in material, shorted and damaged windings and other errors.  Long term decay of a winding can also be detected.

The system used ensures that the component is tested but not damaged during the analysis process.

The shape of the waveform is dictated by the Q factor, inductance and stray capacitance of the winding. High Q shows as a slow decay and the frequency of the waveform is determined by the inductance and stray capacitance of the DUT. Importantly, the short high voltage pulse causes no damage to the device under test.

Simple operation, powerful detection capability and inexpensive ... a winning combination

The 7720 provides an important test capability in the production process for any wound component manufacturer.

Early detection of component faults is a key feature of the 7720.  Faulty material, manufacturing process defects and bad components can be identified early in the process.  This saves money for the manufacturer and it ensures the quality of the product supplied to the customer.

The 7720 has also been designed with ease of use in mind - using a large visual display, graphical format and straightforward intuitive operation. The 7720 provides all this capability at a very attractive price.

Production test software

7720 is fully programmable through its RS232 port.  Specialised production test software is available as an option.  Component readouts can be stored against serial numbers to ensure thorough and rigorous testing of components.

Clear and simple display with automatic PASS/FAIL

Technical specifications

Measurement Parameters
Area under curve
Differential area size
Flutter (corona) value
Waveform comparison.
Voltage Range
200 V to 5 kV (100 V Steps)
Test Voltage Accuracy
Measurement Time
50 ms
200 waveforms
RS232, parallel printer
Measurement Connections
2, 4, 6 or 8  self latching connectors
320 x 240 dot with back lighting
Power requirements
115/230 V 10%, 50/60 Hz
Operation temperature range
0C to 40C
Storage temperature range
-40C to 70C
Relative humidity
Up to 75%
W 425 mm, H 190 mm, D 350 mm
20 kg

Order codes and options

7720 2 port Impulse Winding Tester   1J7720/C2
7720 4 port Impulse Winding Tester   1J7720/C4
7720 6 port Impulse Winding Tester   1J7720/C6
7720 8 port Impulse Winding Tester   1J7720/C8
All units supplied with user manual, 2 m AC power cable and test connectors. 
Production Test Software   PT7720