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Discharge testing machine

New Impulse Winding Tester

DWIT-05PD

The definitive low inductance coil tester!
Clearly displays Waveforms of 10μH Coils

The DWIT series inherits the technology, performance, and reliability of the “DWX series” impulse winding testers and pursues further performance improvement.
The new impulse winding tester features high accuracy, a wide variety of functions, diverse expandability, improved operability, and a full range of external communication interfaces.

Features

  • 12bit resolution x 300MHz sampling High resolution and high speed sampling ADC circuitry enables acquisition of higher resolution waveforms.
    Memory of up to 16384 points ensures that waveform disturbances and partial discharge noise are supplemented, and waveforms can be enlarged and displayed after testing.
    A cursor allows confirmation of waveform rise time, pulse width, and peak voltage.
  • Visualization of inspection process by database management Master waveform, Determination conditions, Test results( Save the test waveform and the judgment value ) in the built-in database.
    You can browse remotely from a computer using SQL client software.
    In addition, test results can be searched by pass or fail, by date and time, which is useful for analysis such as NG generation rate.
  • Abundant Additional Options PD (Partial Discharge) detection antenna / 3ch+GND built-in switching circuit / 4-terminal measurement circuit / Additional applied energy / Current measurement, and many other additional functions are available. (*Some functions cannot be installed at the same time.)
  • Pleasant Functions 10.1-inch color TFT LCD touch panel for improved operability
    External memory (USB, SD) storage of screen shots
    Creation of master waveforms by [Averaging / Composite / Test Waveforms

Overview

The impulse winding tester efficiently and nondestructively performs electrical tests on test objects in their wound state.
The principle of the test is to apply an impulse voltage to a reference winding (master coil) and a winding under test (test object), and compare the transient waveforms to determine whether the test is acceptable or not.
The transient waveforms, i.e., the damped vibration waveforms that occur in the coil, are the inductance and Q values, and the number of coil turns, layer shorts, and core material differences can be determined at the same time.
Furthermore, by applying a high impulse voltage, insulation defects can be detected from the occurrence of corona discharge.
In other words, most of the characteristics required for winding quality can be tested in a very short time.

New mode of DWIT-05

Aging Test (Continuous Printing) Mode The DWIT-05 is equipped with a function that allows continuous application of impulse voltage for an arbitrary time or number of times.
This mode is used to evaluate the degradation of samples caused by the continuous application of impulse voltage for a long period of time.
By adding an optional PD sensor, the time (number of times) until discharge occurs can be observed.

Test Result Mode Test result values are stored in the main unit's memory.
In addition, the number of times the test item was judged as OK, NG, or NG is displayed in graphs and numerical values.
In addition, the test screens of the past 1000 impulse tests can be saved and reviewed.

Existing determination items

More detailed measurement with improved resolution, sampling frequency, and number of samples

Break Down Voltage Test

BDV test mode, which automatically boosts the applied voltage to find the breakdown voltage, is included as a standard feature.

New test items added!

Introduction of New Indicators Showing the Characteristics of the Test Subject and Measurement of Actual Values


1. Frequency Judgment Judgment Based on Resonance Frequency f
The period of the self-resonance waveform is measured, and the frequency is calculated based on its average.
Changes in the impedance and capacitance components of the test subject, as well as losses, appear as changes in frequency.


2. Logarithmic Decrement Judgment Judgment Based on Logarithmic Decrement σ
The amplitude of the self-resonance waveform is measured, and the logarithmic decrement is calculated based on its average.
Changes in the inductance and capacitance components of the test subject, as well as losses, appear as changes in waveform attenuation.


3. VPeak Stability Judgment Judgment Based on the Peak Voltage V of the Resonance Waveform
The amplitude strength is measured based on the peak voltage value of the self-resonance waveform.
Since the peak voltage varies due to waveform distortion and disturbances caused by discharge, losses occurring in the test subject are reflected.


4. Qdmp Judgment Judgment Based on Area Comparison at the Same Resonance Period
Based on the master waveform, the period within the specified range is calculated. The areas of the master and test waveforms over the same period interval are then compared to determine pass or fail. A key feature of this method is that it enables comparison of the magnitude of the coil’s resonance waveform even when there is a shift along the time axis (left or right).

About the “3ch + GND Switching Circuit” Option

Fully Automated Testing of All Phases up to 3-Phase + GND with a Single Connection!
Eliminate the need to reconnect the conventional two alligator clips for each phase-to-phase measurement (U-V / V-W / W-U) and ground measurement (e.g., U-VWE). Even with a three-phase coil using three lead wires, the internal relays automatically switch the circuit after just one initial connection. Impulse testing and insulation evaluation—from phase-to-phase and phase-to-GND—can all be completed in one operation.

・Significantly reduces takt time by eliminating reconnection

・Minimizes the risk of connection errors and poor contact

・Contributes to the full automation and labor savings of the inspection process

Specifications

Applied voltage ・ Energy 100-5000V・0.12J
Voltage accuracy ±5.0%
Applied step 1V
Inductance range 5μ-1H
Resolution / Sampling speed 12bit / Max. 300MHz (20 steps)
Sampling data 16384 , 8192 , 4096 , 2048 , 1024 , 512
Screen display 10.1” color TFT LCD (1280 x 800 (WXGA)) Touch panel
Test mode Impulse Test, BDV（PDIV） Test, Aging Test（NEW）
Judgment Item Existing judgment Area (area comparison), Dif-Area (waveform difference comparison), Flutter (discharge volume comparison), Laplacian (discharge volume comparison)
New Judgment (NEW)Pkstb(peak voltage), Freq(resonant frequency), Ldec(logarithmic decay rate),Q Dumping (Area Comparison at the Same Resonance Period)
Partial discharge judgment*Option〇
Safety protection function Emergency stop button, Interlock
Internal memory Master waveform 1000 models (100 models/10 pages), test results, voltage waveform (csv), screenshot (png)
External interface RS-232C (max. 115,200 bps)
Control(NPN/PNP transistor (changeover by wiring), D-sub 37pin)
Ethernet communication (1000BASE-T), protocol (UDP/IP, TCP/IP)
USB2.0 host (max. 3Mbps)
Trigger output (impulse voltage applied synchronous signal output)
External storage USB memory (2 ports), SD card, SDHC card (max. 32GB)
Operating environment 0°C to 40°C, 80%RH (no condensation)
Input power supply AC100 ～ 240V, 50Hz/60Hz 2A
Dimensions ・ Weight 342(W)×188(H)×366(D) (*Excluding protruding parts) ・ Approx. 9.8kg
Accessories Test cable, Power cable (A type, with 3-pin adapter), Fuse, Operation manual, Test report
  • Applied voltage ・ Energy
    100-5000V・0.12J
  • Voltage accuracy
    ±5.0%
  • Applied step
    1V
  • Inductance range
    5μ-1H
  • Resolution / Sampling speed
    12bit / Max. 300MHz (20 steps)
  • Sampling data
    16384 , 8192 , 4096 , 2048 , 1024 , 512
  • Screen display
    10.1” color TFT LCD (1280 x 800 (WXGA)) Touch panel
  • Test mode
    Impulse Test, BDV（PDIV） Test, Aging Test（NEW）
  • Judgment Item
    Existing judgmentArea (area comparison), Dif-Area (waveform difference comparison), Flutter (discharge volume comparison), Laplacian (discharge volume comparison)
    New Judgment (NEW)Pkstb(peak voltage), Freq(resonant frequency), Ldec(logarithmic decay rate),Q Dumping (Area Comparison at the Same Resonance Period)
    Partial discharge judgment*Option〇
  • Safety protection function
    Emergency stop button, Interlock
  • Internal memory
    Master waveform 1000 models (100 models/10 pages), test results, voltage waveform (csv), screenshot (png)
  • External interface
    RS-232C (max. 115,200 bps)
    Control(NPN/PNP transistor (changeover by wiring), D-sub 37pin)
    Ethernet communication (1000BASE-T), protocol (UDP/IP, TCP/IP)
    USB2.0 host (max. 3Mbps)
    Trigger output (impulse voltage applied synchronous signal output)
  • External storage
    USB memory (2 ports), SD card, SDHC card (max. 32GB)
  • Operating environment
    0°C to 40°C, 80%RH (no condensation)
  • Input power supply
    AC100 ～ 240V, 50Hz/60Hz 2A
  • Dimensions ・ Weight
    342(W)×188(H)×366(D) (*Excluding protruding parts) ・ Approx. 9.8kg
  • Accessories
    Test cable, Power cable (A type, with 3-pin adapter), Fuse, Operation manual, Test report
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