Vasile Surducan gmail.com> writes: > On 4/2/07, Peter P. yahoo.com> wrote: > > I have made a schematic for a susceptance tester that closely approximates > > what and how I tested so others can do this too. Please see attached. > > The 5.1V zenner voltage could have any thresold starting from 4.8V to > 5.3V or so. The ouside impedance between Vdd and Vss( if you like Vss > against GND) could be any and it's uncontrolable. The current flow to > opened ESD diodes has a variable flowing path impedance through less > or higher opened 5.1V zenner. I wrote that the circuit where my problems occurred closely resembles the susceptance testing circuit I posted. The 10 ohm resistor in the supply line is also there for a reason (besides measuring current). In the real circuit the zener is the regulator proper (and also the supply overvoltage clamp). > If you really want measurements, than use metrological methodes. I don't want measurements, I want a simulator that allows me to find out how to read the datasheet 'between the lines' before making a board that will not work without 'help' soldered on the back. Usually I strongly prefer to have all the parts on the parts side and no 'extras', hot stuff, cut traces and wirewrap bridges. Those appear anyway during prototyping, but this controls their numbers. thanks, Peter -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist