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Quick Details

  • Place of Origin: Jiangsu, China (Mainland)
  • Brand Name: Eucol
  • Model Number: U9845
  • Impulse voltage: 100V~5000V, 10Vstep
  • Test speed: Max.12meas/sec
  • Accuracy: ±1%
  • Applied pulses: Max. 32 of test pulse
  • Memory: 120 groups
  • Display: 800*480 , 7-inch color TFT
  • Interface: Handler,RS232C, USB Device

Packaging & Delivery

Packaging Details 1. Carton Package 2. Dimension: 48 (width)*45 (depth)*24(height) cm 3. Net Weight: 10.0kg
Delivery Time In stock


  • Delta and star connection of three-phase machine, Primary and secondary windings, primary and secondary secondary windings, primary and secondary + primary and secondary windings of single-phase machine can be tested; satisfying motor interturn testing of all series (U9845, all-powerful motor test)
  • Provide 8-channel sweep test at most (U9805X)
  • Two-channel comparison test, dispense with standard waveform acquisition
  • 65k color 7’’ TFT high definition display screen, selectable Chinese and English interfaces
  • Waveform sampling rate:100Msps; memory depth: 6500bytes
  • Max. Test speed: 12 meas/sec
  • Four waveform comparison methods: Area, differential area, corona and differential phase
  • Strong corona analysis and extraction function (several corona modes and corona display function) to excavate potential defective insulation of products
  • Excellent test repeatability to guarantee stable measurement
  • Instrument parameters automatic storage and boot-up file load function
  • Vertical exaggeration, horizontal zoom and movement of waveforms for detail observation
  • Sample average function, average processing of 32 standard waveforms
  • Automatic standard acquisition mode to select suitable sampling rate
  • Destructive testing bring the right test voltage for you
  • Fast test mode can make real-time change of impulse voltage and sampling rate
  • Imposed demagnetized impulse to ensure the conformity of the tested waveforms
  • 20000 pieces of historical measured data storage and discrimination statistics function; can be saved to the U-disk
  • Directly save the screen pictures (BMP, GIF, PNG) or waveform data to U-disk through SAVE key
  • System firmware upgrade through U-disk
  • Foot switch interface for easy and fast measurements
  • Handler, RS232C, USB Device, USB Host and GPIB (option)



Brief Introduction

  U9825/U9845/U9805X series impulse winding tester adopts high stability & high-voltage impact power and thyristor module controlled high-voltage switching devices, which bring a substantial increase in the stability and reliability of the product. With advanced 32 bit CPU and high speed FPGA, 100Msps sampling rate and memory depth of 6500 bytes make the test more precise; the use of high speed testing technique make the maximum test speed up to 12 meas/sec. 

Comparison test function

Without collecting standard waveforms, the consistency of two tested coils can be compared rapidly.



 Corona display function

Up to 100Msps sampling rate ensure precise extraction of corona information. The equipped corona display function make corona information and product performance clear and visualized.


Figure 3  Corona display in normal waveform display


   Figure 4  Corona display in magnified waveform display










Channel number of HV



Customizable, 8-channel at most

Impulse voltage

100V~5000V, 10V step, 5%±10V

Inductance test range


Impulse energy

Max.: 0.25 Joule

Test speed

Single-winding: Max.12 meas/sec

4-winding: Max.2 meas/sec

Applied pulses

Max. 32 of test pulse; max.8 of demagnetizing pulse

Input impedance



800x480 dot 65k color TFT

Waveform display range: 650x256, support 1.5 times magnifying display

Waveform acquisition

Sampling rate: max.100Msps, adjustable 10 levels

Resolution: 8 Bits

Memory Depth:6500 bytes

Sample average:1-32

Comparison methods

 Area, differential area, corona and differential phase

Test repeated accuracy


Comparison test



Waveform measurement

Voltage/Frequency/Time of the waveform

Trigger Mode

Manual (including foot switch)/External/Internal/Bus

Detection Output

OK/NG display, LED / alarm

Test statistics

Statistics function of measurement time and results, up to 20000 pieces



150 groups

120 groups

60 groups



600groups (standard waveform data and test setup parameters)

HANDLER signal





USB Slave, RS232C, IEEE488 (option)

USB Host (support storage of BMP, GIF, PNG image files and firmware upgrade)

Power supply

Power supply

220V±10%  50Hz±5%

Power consumption


General conditions




0 - 40



≤75% R.H.



Dimension (HxWxD)

400mmx 132mmx350mm



Ordering Information

U9845   Impulse Winding Tester


Instrument Accessories

U26022A             High-voltage Test clip leads

U26023               Foot Switch

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