7920L/7920 Impulse Winding tester is a coil (such as voltage transformer, inductance, motor) testing instrument that tests self-insulating property of the coil.
The influences of winding materials, magnetic materials, and framework, also extra fabrication decreases the insulating property of coil layers along with the jumpers and jacks.
The 7920L/7920 adopts the technology of high-speed sampling rate to store the sample waveform of the standard (master) coil in the instrument. By comparing the waveform results of the test coil to the master, the defect in the DUT can be found easily. Moreover, the 7920L/7920 judges the quality of the testing coil according to the parameter set by the user.

Testing Voltage
200V∼5000V (100V/ Step)
Output Energy
0.25J (Max)

Inductance Range Of Test Coil
0.2μH and above
Sampling Rate
8 bit /10 ns (100MHz)
Sampling Memory Depth
5000 Byte
Input Resistance
10MΩ
Display Measure
5.6 inch Colored LCD (320 x 234)
Comparison Measures
AreaSize Comparison, DiffZone Comparison, Corona Amount, Comparison Corona Number Comparison
Storage Waveforms
360 Sets of waveform
Comparison Output
Pass/Fail, beeping
Communication
1. USB 2.0 2. RS-232 or I/O
Power
110V/220V AC
Frequency Range
50/60Hz
Dimension
52cm x 44cm x 15cm
Weight
11Kg
Temperature
25°C to 40°C
PC System Requirement
Operating System Windows 98/2000/XP/Vista32

Standard Accessories
Main unit...........................x1
High voltage test line........x1set
AC power cord..................x1
USB cable.........................x1
RS-232Cable....................x1
CD.....................................x1 (Driver and user manual are included)