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'[EE] Pinout for 4-pin current clamp probe?'
2010\07\27@001650 by Peter Loron

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I have several clamp-on current probes that I'm trying to figure out. They 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 further information about them. Presumably they go into some kind of automotive diagnostic tool.

Any pointers from the hive mind?

Thanks!

-Pet

2010\07\27@010500 by Sean Breheny

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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=160.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 <spam_OUTpeterlTakeThisOuTspamstandingwave.org> wrote:
{Quote hidden}

>

2010\07\27@033836 by Peter Loron

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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 with 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 possible pin positions and a simple leg + groove type attachment rather than threads.

For those interested, (poor) pics are here:

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:

{Quote hidden}

>> -

2010\07\27@083448 by Sean Breheny

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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 <peterlspamKILLspamstandingwave.org> wrote:
{Quote hidden}

>>> --

2010\07\27@125333 by Dwayne Reid

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At 10:16 PM 7/26/2010, Peter Loron wrote:
>I have several clamp-on current probes that I'm trying to figure
>out. They 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
>further information about them. Presumably they go into some kind of
>automotive diagnostic tool.

Your timing is impeccable <grin>.

I purchased what I think are 4 identical current probes from eBay a couple of weeks ago and have not yet gotten around to checking them out.

Mine have a label on the side that says SPC Amp Probe  534-07097  and a serial number.

Anyway, the connector on my units is a Tuchel connector - this is a locking DIN connector.  You can use a standard DIN connector of the correct pin count without needing to worry about the locking ring.

I see these connectors primarily on European equipment but occasionally run into them on gear manufactured in North America.  I don't have a recent source of these connectors but perhaps the correct name will guide you in the proper direction.

Based on your photos, I suspect these are a DC current probe with a hall-effect sensor bridge at the business end.  That flex cable going into the clamp head would be 4 conductors if I am correct.  I'm guessing that the upper frequency response is anywhere from several KHz to several hundred KHz - but not likely to reach MHz.

I'd be really interested in a copy of any info you work out on these units - save me a bunch of time for when I do get around to playing with them.  A schematic of the that PCB would be particularly revealing.

Hope this helps - and thanks!

dwayne

-- Dwayne Reid   <EraseMEdwaynerspam_OUTspamTakeThisOuTplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax
http://www.trinity-electronics.com
Custom Electronics Design and Manufacturing

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