Is There a Tester That Can Test Entire Circuit Board?
I received two quite similar emails from two different ERG members whether is there a tester that can test the entire circuit board.? My answer to them- no there were no tester that can test the entire circuit board. I told them that different circuit and different components need different tester to check it. If you are troubleshooting TTL circuit then you need a logic probe and logic pulser to help find out the bad ic. En ESR meter or even multimeter can't do the job.
If you want to check a coil then you need a coil or a ring tester. Again, Ohmmeter would not be able to detect shorted winding in a coil. If you want to see the output waveform of an IC, an oscillscope will be helpful on this. Even a good digital multimeter would not be able to check such waveform. If you want to see which section of a PC mother board have problem then you need a PC post card to do the job for you. If there is a short circuit in a high density board then you need a short circuit finder to locate the shorted component.
I hope you are clear now why a successful electronics repairer have so many test equipment on their bench. Those testers on the repair bench are not meant to be shown off but a way to finding fault faster than just depending only on a single multimeter.