Hi Peter, I didn't see any photos of the connector itself in those photos. Did I miss something? Sean On Tue, Jul 27, 2010 at 3:38 AM, Peter Loron wrot= e: > Well, I had a bit of time tonight, so in hallowed hacker fashion, I took = one of them apart. Looks like a vref chip and three TLC2272 op-amps. I put = 5V on the red and black lines, and measured 2.5xxV on the yellow and green.= I didn't have anything at my desk that drew more than mA I could reach wit= h the clamp as it was set up, so that will have to wait for later. > > The connector isn't one of the 165-12 types, it is simpler with only 6 po= ssible pin positions and a simple leg + groove type attachment rather than = threads. > > For those interested, (poor) pics are here: > > http://www.flickr.com/photos/24004042@N03/4833170151/in/photostream/ > http://www.flickr.com/photos/24004042@N03/4833782240/in/photostream/ > > -Pete > > On Jul 26, 2010, at 10:04 PM, Sean Breheny wrote: > >> Hi Peter, >> >> Could it be an Amphenol 165 series connector (like the 165-12)? >> >> Look at the bottom of this catalog page >> http://www.alliedelec.com/catalog/pf.aspx?FN=3D160.pdf >> >> also some images here: >> http://www.dfwairparts.com/Amphenol.html >> >> These are used on Tektronix current probes like the venerable A6303. >> The A6303 is a DC to 15MHz probe which combines a current transformer >> with a hall sensor and current feedback coil. The current in the >> feedback coil is adjusted to keep the low frequency flux in the core >> at near zero. The signal to drive the feedback coil forms the low freq >> portion of the output signal. The remainder of what comes out of the >> current transformer is the high frequency signal. These two signals >> get combined (and the feedback coil current is generated) in the probe >> amplifier, which is a separate module (like the AM503 or AM503A). >> >> Sean >> >> >> >> On Tue, Jul 27, 2010 at 12:16 AM, Peter Loron = wrote: >>> I have several clamp-on current probes that I'm trying to figure out. T= hey have a screw-on connector that looks a bit like an XLR connector. There= are 4 pins arranged in an arc across maybe 1/3 of the circumference of the= connector. >>> >>> I'm familiar with the 2-pin probes or plain current sense transformers,= but I'm not sure what to make of this one. >>> >>> These probes are SPX brand, but I have been unable to track down any fu= rther information about them. Presumably they go into some kind of automoti= ve diagnostic tool. >>> >>> Any pointers from the hive mind? >>> >>> Thanks! >>> >>> -Pete >>> -- >>> http://www.piclist.com PIC/SX FAQ & list archive >>> View/change your membership options at >>> http://mailman.mit.edu/mailman/listinfo/piclist >>> >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .