Easy to use surge tester


1.Available 3kv(DST030E),5kv(DST050E), 10kv(DST010K) each.

2. 7″ touch display for setting all the test  parameter and environment

      eg. STYLE/VOLTAGE/SCALE/PASS/PULSE/L/H/waveform length

3.High sampling rate (25Msps),10bit ADC

4.Acquire  multiple continuous waveforms of 50ms interval to PC

5.100 memory  location for saving Master    waveform and STYLE.

6.Judgement(PASS or NG) by AREA and differential AREA 

7.RS232 interface (USB interface is option)included for remote control.

   (front switch panel and rear parallel interface are optional.)

8.screen save function for long life time of touch display

9.Power supply : AC100~230V free volt

10.Display resolution : 800*480 pixel

   (waveform area 640*256)

11.Dimension:435*178*420 (W*H*L) mm 

12.Weigth: approx 20 kg

CHECK waveform using PC

RS232 waveform Loader

1.Loading Master and Test waveform each from surge tester to PC.

2. To load Master waveform,use LOAD waveform button.

   number “2” in  upper box means pre-saved  Master waveform 2,

   Pressing RED button loads RED lined Master waveform to screen.

   Master Waveform is available from 0 to 99.

3.To test and load Test waveform,use SEND button.

  ” SS02″ in upper box means START surge tester using predefined

   STYLE 02 in surge tester Memory.

   Each STYLE defines VOLTAGE/SCALE/PASS so on.

   STYLE memory position is available  from 0 to 99.

4. Using 10 bit ADC,graph resolution 1024 by 1024 pixel if waveform- 

    length in STYLE is  set to 1280 byte.

    if waveform length is set less than 1280,then Received waveform 

    resolution is 8bit(0~255)


Coils are used in a wide range of applications e.g. transformer, motor, generator, ignition coil for cars and motorcycles, relay, electromagnet, filter and various inductors, nearly all the electronic and electrical products have to use coils. However, coils do not have a complete automatic manufacturing process like standard electronic components, and the existing enameled wires are neither fault-free during production nor ensure 100% quality guarantee. 7720 is a 8-channel 5KV impulse winding tester that provides the comparison of waveform functions e.g. Area under curve ratio, Area size ratio, Voltage time difference, and you can use the cursor to select desired comparison range to cover all the waveform differences created by electrical properties then detect a faulty component. This model offers various harmonics mode and accommodate all kinds of coils, and become the best tester that you are able to find on the market to certify coil quality.

In short: What is surge testing and how does it work?

The surge test is an established practice in the manufacture of winding goods of all kinds used in the maintenance and repair since the early 50s, this test is now an integral part in the production of engines, rotors and stators, electric valves and coils of all kinds. To ensure quality, the surge voltage test, also called surge test is not replaceable.

During maintenance and repair the insulation of windings which weakens by aging, vibration, humidity and temperature variations is checked to ensure the production quality during production. Even the quality of the enameled copper wire and iron packets are checked. The classic hipot testing only checks insulation defects of the phases one below the other or in lamination bundles. Defects in the windings go undetected. Here, the physical principle of the surge tests offers the only possibility of viewing insulation of individual winding. No measure of the resistance or inductivity can give the results of what a surge test can give.

The principle is that a high voltage pulse is generated by a charged capacitor and is fed to the winding and the subsequent oscillation (L = test specimen, C = tester) is analysed. Due to the very short pulse potential differences between the adjacent windings, or layers of coils are produced. Exactly these potentials are the basis of this assessment: in case of error arising changes, although there is still no galvanic contact. The height of the test voltage and the rise time of the pulses are the decisive factors. Both current pulse as well as the impulse response contains information about the test object. Impedance and quality of the winding are included in the test result. Therefore, all errors are detected, which are affected by these parameters. This includes number of windings, winding geometry and wire errors including interturn and location circuits as well as problems in the magnetic core or laminated core. 

An effect in the surge test: The partial discharge

The partial discharge (PD) is present not only in the conventional hipot test. This effect also occurs at the surge test. Due to the increase in frequency converter in motor control this test has become very important. As the term “partial discharge” suggests, a complete breakdown does not take place here. Only in one section a partial insulation weakness or underperformance manufactured area is available. This weak point can be loaded during operation or testing far in excess. Therefore, this point does not withstand the increased load and there is a partial breakdown, the partial discharge. The other areas of the insulation can withstand the voltage stress and it does not result in a flashover in the conventional sense. The aim should always be to avoid a partial discharge. What matters is the construction of the test sample and the insulation as well as the level of the test voltage. In practice, it is not necessary to measure the partial discharge (in pico Coulomb). It is sufficient to detect the partial discharge. For this purpose, two methods are used:

  • In manufacturing, a wired connection is preferred in surge test. Interference is less of an issue. 
  • Alternatively, the detection of the high frequency signals through antennas is possible. It is important in this solution to place the antenna in proper position and the avoidance of interference pulses.

We have the right surge tester for you

All surge tester of DaesongTEK feature computer which evaluates both the vibration curve and the partial discharge. Several different methods of analysis are available. In addition, see also separate devices for partial discharges, for surge test or for the conventional examination with hipot tester in the delivery program. The devices operate as stand-alone or via interfaces with a PC – the right software can be found in our product range. Both the surge test and the measurement of partial discharge can be combined with other tests in a PC-bound test system. The connection to the various terminals of the test sample happens via high voltage relay in 4-wire (Kelvin technique).

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