Grease monkey

Vermason Surface Resistivity Test Kit (ESD Tester) teardown

Grease monkey -

Look what I scored for just 16 CHF (that's about $16)!!! A proper surface resistivity test kit in working condition. From the dates on the chips it's a late 90's model but for all intents and purposes still good. Let's take a look of what is inside this thing.

Tear-down

I have no idea how this thing works so let's see. The parts I could make out are:

  • HCF4066BE  - Quad analog switch
  • HCF40106BE - Hex Schmitt Trigger
  • LPC662IN - 2fA  input bias current dual op amp (now we are getting somewhere)
  • LPC660IN - same as LPC662 but quad
Transistors etc.
  • BAV45 - Picoampere diode
  • BC212L - PNP General Purpose Amplifier
  • ZTX450 - NPN silicon planar medium power transistor
  • ZTX455 - NPN silicon planar medium power transistor
  • TA78L005AP - 5V regulator

As it looks the tester doesn't use any exotic or expensive parts. When I find some time I will try to reverse engineer the PCB and perhaps make a design of my own. We'll see.