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Self sensing probes for oscilloscope

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G7PSK:
I have an Iwatsu SS-7804A oscilloscope that has auto sense for 1,10 and 100X probes. I do not have the original probes for the scope but have found that connecting the bnc to the ring at the base of the bnc on the scope with a 220k resistor gives 10X sense and a dead short gives a 100X while leaving no connection is 1X. What I would like to do is find the type of BNC that has the extra connection on it so that I can rig my probes to auto sense. Any one know what these type of BNC are called and where it is possible to source a few of them.

edavid:
They are called readout encoding BNCs, or readout pin BNCs.  They are hard to find on their own.  You may have more luck buying some lower end used Tek probes such as P6062, P6102, P6105s, P6109.

nctnico:
IIRC Testec has probes with sense pins but in my experience 1:1 / 1:10 switchable probes are much more convenient.

edavid:

--- Quote from: nctnico on July 22, 2013, 10:42:40 pm ---IIRC Testec has probes with sense pins but in my experience 1:1 / 1:10 switchable probes are much more convenient.

--- End quote ---

Tek P6062, P6063, P6127 and P6129 are switchable and have readout pins.  Maybe others too.

G7PSK:
The tek probes that I have seen appear to have a sense pin that goes into a hole next to the bnc, the bnc's on the Iwatsu have an annular ring at the base which is no larger than the outside of the bnc that is insulated from the bnc and the case that makes the connection via a skirt or pin whatever it is the gap is only a couple of mm. I will post a picture of the scope connections.. I know that it is very easy to just do the maths with the probe settings, but having found that the scope can alter its read out automatically it would be rather nice to make it do so without having to spend a fortune on special probes. What I had in mind was a die cast box with a male and female bnc containing a suitable switch and resistor network so that I can just dial between 1,10 &100 times perhaps even via a tac button on the probe 

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