Andy,
Zeiss uses the "switching" function as a major argument in advertising
this probe, so measuring the bare resistance wouldn't be satisfying.
There must be a feature you didn't find when destroying your probe. It's
digital this way. Unfortunately, on the Zeiss homepage, when selecting
the catalog with detailed description of the RST-P's functionality they
answer the page is currently not available.
Peter
Am 11.05.2018 um 00:08 schrieb andy pugh:
On 10 May 2018 at 21:09, Andrew <pkm...@gmail.com> wrote:
The interface is a 5-ring connector like a jack plug.
I haven't managed to figure out which ring is which, and Zeiss are not
saying.
So it must be two NC contacts and the rest for the piezo.
Yes, I figured that much out, the question was which is which.
I damaged one trying to get it apart, so decided to simply part-off
the top on the lathe. (They really are not designed for disassembly).
It turns out that the NC contacts are part of a resistor network.
There is a 90k across the contacts and a 470k in series. That was why
my beep-test didn't work (I had not realised that putting my
multimeter in beep mode also locks it in single-ohms mode, so the
display was showing nothing.)
So, working purely as a touch-probe they show 76kΩ when un-triggered
and 90kΩ when triggered. So I need to find a way to convert that to a
digital input for LinuxCNC.
(I may well just ignore the piezo element)
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