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The quality verification test items for Wound Component consist of AC/DC Hipot tests, Insulation Resistance (IR) test and Impulse Winding test. Chroma integrates above tests into 19035 Wound Component EST Scanner series per forming safety tests for motor, transformer, heater related wound products. The wound component manufacturers in quality verification testing not only have reliable quality but also control product quality efficiently
The 19035 Series support 5kVac/6kVdc high voltage output to conform with withstand test requirement for Wound Component, its maximum output cur rent can up to 30mA. Insulation Resistance (IR) test measurement range is 1mΩ to 50G Ω and voltage output can up to 5kV. DCR can measure basic specification for Wound Component and also check the connection before testing safety withstand.
The 19035 Series also include powerful functions in Flashover detection and Open/Short Check (OSC) as well as programmable voltage, time parameters, etc. for various DUTs features to promote testing reliability and product quality.
The 19035 is a comprehensive safety tester designed for motor, transformer, heater related wound component requirements. Most of wound components are equipped with multiple winding such as 3-phase motor, dual winding transformer, etc. moreover, the wound component needs to use Impulse Winding Tester for high voltage winding to check insulation no good of winding device.
The 19035 design is for connecting DWX Series – Impulse Winding Tester directly and using the 19035 8-Channel scanning to reach multiple points completion in one test instead of switching test point by manual. It saves test time and human cost.
The 19035 provides OSC and DCR functions to verify if bad contact or short circuit happened during test procedure. It solves the Wound Components of motor, transformer, etc occurred contact problems, so that test quality greatly enhanced and the life of test device prolonged.
Chroma 19035 have Flashover detection as other Chroma EST tester. The Flashover is a momentary discharge in/on a isolation material which causes the current in the test circuit and losing the insulating properties of a test specimen. Flashover can't be detected by leakage current of high voltage test. Chroma EST tester find the Flashover out by the rate of leakage current differential.
The requirement of test environment indicates that test equipment is equipped with auto interrupt device so that Chroma develops into Ground Fault Interrupt (GFI) function. When the current meter A1 and A2 detect the difference (i2-i1 =iH ) between the value i1 and actual i2 test current over high, this device can cut the power transiently for protecting human body safety. It is not only accordingly to the safety standard but also more safeguards for test personnel.
OSC function is used to check the connection is open or short circuit between instrument and DUT (equipment under test) before the Electric Safety Test. If the connect is bad between the instrument and DUT, sometimes like leads or relay oxidation, the judgment is PASS also. In some cases, the DUT was short before testing. Testing continually lead to our instrument broke because suffered the high load current. Therefore, we have to check the open and short circuit to ensure the test effectively and protect instruments. Generally, the DUT have capacitive load (Cx) from tens to thousands pF. If the connect opening, a capacitance will appear and then total capacitive load is lower then that in normal condition. If the connect shorting, total capacitive load is higher then that in normal condition. Therefore, we can measure the value of capacitive load to check the contact is good or not.
DWX series have Impulse Winding Test imposed a high voltage immediately on windings. It detected isolation, inductance and parallel capacitance of winding by RLC parallel resonance waveform differential. more Detail information please refer the application and technical notes of Chroma DWX series.
The Chroma 19035 was designed to connect DWX series directly with 8 channels scan ports for Impulse Winding Test in one program only. DWX series Impulse Winding Tester have large TFT LCD display for observation of winding insulation failure waveform. Figure as left showed the winding insulation failure detection by rate of area decrease. Figure as right showed the flashover detection by Laplacian.
DCR measurement for two-wire/four-wire is one of the standard test items. The two-wire measurement is suitable for major DCR, whereas the four-wire measurement is suitable for minor DCR since it has higher accuracy.
The problem caused by temp difference will be occurred usual ly as measuring minor DCR value. When the temp difference and the measured resistance value will be different. The Temp Compensation function is added to the 19035, the DCR converted to the measured value under standard temp via temp coefficient conversion. Thus, the measured difference generated by temp difference would be reduced.
DCR BalanceThe DCR value is commonly related to inductance balance. When the DCR of three sets of wound motor unbalance will cause the rotation unbalance as well as bad quality after long time use. The DCR balance judgment subtracts the minimum value from maximum value of winding, if the value over setting range i.e. no good product. The DCR Balance function will be the auxiliary tool for motor products in longterm reliability testing.
Contact CheckDCR test not only measure the resistance of winding, but also check the connecting before Hipot test. The Chroma 19035 can perform the DCR measurement on windings to check external contact, especially for the capacitance lower than 20 pF between the test points in wound component.
The rotating electrical machine semi-finished products of motor, DC fan, etc includes stator and rotor which need to per form electrical scanning tests of withstand voltage, DC resistance and layer short.
The 19035-m is no need computer control and offers DCR four-wire measurement. The users can scan test two DUTs at a time by 8 sets of separable test terminals of separated Drive and Sense terminals to promote productivities.
Parallel test is often used as a solution to promote the efficiency of withstand voltage tests during the production by manufacturers. However, if it is unable to set the current high/low limit correctly and caused the defect products to be released or the good products to be judged as bad and go to the subsequent stations for test, the stations and cost will be increased.
A sub-step function is provided by 19035 Series to solve the trouble caused by parallel test. The Fail can be set as a sub-step activation condition by editing the program sequence when parallel test is required for production. It means the substep test will conduct only when the main test item (parallel) is failed and judge which DUT is bad. With the implementation of this function, the efficiency of withstand voltage test will improve significantly on the production line.
Example :| Model | Description | Quote | Buy |
| 19035 | Wound Component EST Scanner |  |
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| A190347 | GPIB & Handler & Temperature Interface | |
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| A190351 | 8ch-16ch HV box for 19035 | |
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