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It would take 8 different oscillator configurations to test a part to see if the gate functions work, but that still would not do things such as characterize the different threshold voltages. Which parameter(s) are you testing for? And why?
In my career and hobby I bought probably thousands of ICs and never found a bad one. Maybe because I buy Name Brand parts from a local real electronic parts distributor not cheap junk from ebay, Amazon or Aliexpress.
I had an equalizer product manufactured and tested. All parts were from as above. 25,000 equalizers were made and only two failed. One had a bad electrolytic capacitor and the other had its quad opamp IC mounted backwards. The final tests were very detailed and all ICs performed perfectly. The ICs were not tested before assembly.
I am trying to repair my welder I have got it running but I can not get the welder to change from spot mode to weld mode.
I operate the switches but no change.
The only way I know is to test all components I do not have a circuit digram.
I know what voltage is on the feed motor.and and welding torch triger.
If you can help me to find the fault I would apperiate.
If you want more information then I will try to help you out.
I need to fix this welder
A simple and reliable way to test Vth(+) and Vth(-) and understanding the hysteresis concept, as long as one has a two-channel scope. Simultaneously monitoring input and output.
I've used this trick myself.
Another, if one has multifunction generator, is to apply a triangle wave at the input. And monitor it again with a two-channel scope.