| Products > Test Equipment |
| How to make a breakdown voltage tester for IGBT, Transistors, Zener Diodes etc? |
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| jdev99:
I saw this tester on AliExpress and want to know if anybody made one themselves yet? The specs are: *********************************************************************** "This portable voltage capability tester can help you to test MOSFETs, IGBT, diode, zener diodes, capacitors, Max. breakdown voltage capacity. It is easy to operate and test. The voltage and current adjust buttons allow you to adjust to the correct voltage and current to different tested objects. Features: 1. The output voltage is direct current 110~2600V, you can turn the voltage adjust button clockwise to make the voltage bigger and counterclockwise to make the voltage smaller. 2. The output current is 0.25~3.4mAh, you can turn the voltage adjust button clockwise to make the current bigger, and counterclockwise to make the current smaller. 3. When testing MOS tubes, transistors, and Zener diodes, it is recommended to adjust the current to the minimum scale of 0.25mA. When testing the LED back light board, it is recommended to adjust the current to the maximum scale of 3.4mAh. 4. Portable Size: The small size of this tool is very convenient for everyday use, you can carry it in your tool bag without taking up too much storage space. 5. Built-in 660mAh large capacity lithium battery to supplys power, and you can recharge it through the Type-C interface in time. 6. Wide Applications: This tool can be widely used for testing MOS, triode, IGBT, diode, zener diodes, diode bridges max. voltage capacity, capacitor and varistors' voltage verification, LED backlight and light board testing, etc. Specifications: Output voltage: direct current 110~2600V Output current: 0.25~3.4mAh Battery: 1 * lithium battery, 660mAh (included)" ************************************************************* Yes, I can just buy it, but it is much more fun to DIY it. ;) https://www.aliexpress.com/i/1005004347430658.html |
| AVGresponding:
If that thing is genuinely capable of outputting 2.7kV as the controls suggest, I would question the clearances afforded by a Phoenix Contact connector. Also, it wouldn't need much output capacitance to be potentially lethal. |
| jdev99:
I found some ideas here (in Russian): https://radiokot.ru/konkursCatDay2017/48/ |
| Calambres:
--- Quote from: AVGresponding on July 20, 2023, 04:02:32 pm ---If that thing is genuinely capable of outputting 2.7kV as the controls suggest, I would question the clearances afforded by a Phoenix Contact connector. Also, it wouldn't need much output capacitance to be potentially lethal. --- End quote --- I've got one of those and yes, it can go up to 2.7KV and yes, it is quite dangerous indeed. On the other hand it works quite well for what's intended and I have not yet found a need to put it to its maximum voltage output other than to measure it. https://www.eevblog.com/forum/reviews/completely-non-sketchy-mini-high-voltage-transistor-tester-(emeco)/msg4826684/#msg4826684 |
| T3sl4co1l:
That's basically what I do, with a HV supply of my own design. I use this power supply, with a calibrated output, and adjust its voltage slowly upwards until the DUT passes the desired test current. Test current is measured by the voltage drop across a 10k resistor. There is also a 100k resistor between HV and device to protect against unexpected avalanche, breakdown, and to limit capacitive discharge in case of intermittent contact. The total 110k resistance is calibrated (measured), and the voltage drop subtracted from the HV output to get the DUT voltage. This could all be automated and packed into an enclosure of course, but it doesn't really matter to me; there are few things I need to test in this way. (And if you do need to test things more often, it's probably that you need a megger instead.) Tim |
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