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TM500/5000 Extender Cable Wire Gauges

 

Hi to All,

It is all in the 067-0645-02 Extender Cable Document which can be found on the Ebaman site. 17/20 AWG and 28/34 AWG are the Wire Gauges. In case you don't want to subscribe I can send you the pdf-document. Please respond directly.

Greetings,

Egge Siert
 

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The wire size specification is very interesting (multiple gauges and conductor counts in a single flat cable), so I went poking around and found a reasonably good photo of the extender assembly at .

There is also an eBay photo from a past auction (item #300851503347) which shows two separate cables side-by-side, which makes sense. I counted 17 of the larger wires and 34 of the smaller wires in the photo. Presumably the spec may thus be interpreted as "17 conductors of #20 AWG and 34 conductors of #28 AWG". That would make 51 connections, which is five less than there are connector contacts. Now I just need to either get some #20 AWG flat cable, or figure out which connections use which size wire.

Cheers,
Dave


On 2/23/2013 7:30 AM, Egge Siert wrote:

?

Hi to All,

It is all in the 067-0645-02 Extender Cable Document which can be found on the Ebaman site. 17/20 AWG and 28/34 AWG are the Wire Gauges. In case you don't want to subscribe I can send you the pdf-document. Please respond directly.

Greetings,

Egge Siert
 

Hi Dave,

Good point. I accidentally switched the last two. It is indeed 34/28 AWG.

Egge Siert
Craig Sawyers
 

It is all in the 067-0645-02 Extender Cable Document which can be found on
the Ebaman site. 17/20 AWG and 28/34 AWG are the Wire Gauges. In case
you don't want to subscribe I can send you the pdf-document. Please
respond directly.
I've searched ebaman for this - but draw a blank for the p/no or extender as
search terms.

Craig
 

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It is on the Ebaman site, but not where one would expect to find it. Here is a direct URL: .

Cheers,
Dave


On 2/23/2013 8:33 AM, Craig Sawyers wrote:

?

> It is all in the 067-0645-02 Extender Cable Document which can be found on
> the Ebaman site. 17/20 AWG and 28/34 AWG are the Wire Gauges. In case
> you don't want to subscribe I can send you the pdf-document. Please
> respond directly.

I've searched ebaman for this - but draw a blank for the p/no or extender as
search terms.

Craig
John Griessen
 

On 02/23/2013 09:05 AM, Dave Daniel wrote:
Presumably the spec may thus be interpreted as "17 conductors of #20 AWG and 34 conductors of #28 AWG".
Dang! Is it really 20 Gauge? I just found some surplus fire sale 22 AWG ribbon cable for sale...
John Griessen
 

On 02/23/2013 09:21 AM, Egge Siert wrote:
Good point. I accidentally switched the last two. It is indeed 34/28 AWG.
Hi Egge,

Is it that thin? 34 AWG and 28 AWG? Those are power handling wires for the
pass transistors, and 28 seems thin...
 

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Well, of course it's hard to be precise from a photo, but the Tek manual calls out those numbers, and the cable in the photo looks like something close to AWG 20, so I'm pretty sure? AWG 20 is what was used in the original Tektronix extenders. Note that, for single-plug-in troubleshooting, nothing other than connections to the power pins in he mainframe are necessary (now that I understand the mainframe connector pinouts). The "signal" pins were only meant for customer custom interconnection between plug-ins. That is what the strange 50-pin D connector on the rear of the mainframe was intended to be used for.

All this talk of adding active components to the extender is fine, but I am going to assume that the Tektronix Engineers knew what they were about when they designed the extender.? I am going to replicate that design as best I can.

It is, however, interesting to note that it appears that many people have successfully used homebrewed extender cables with significantly smaller wire sizes than the original Tek cables without any problems.

I believe we are venturing into the "Art" part of the "Art and Science of Engineering", all of the calculations on current-carrying capacity that have been written in this thread notwithstanding.
One presumes that the Tektronix engineers went through all of that, and their bar was customer satisfaction. QED.

Cheers,
Dave

On 2/23/2013 6:38 PM, John Griessen wrote:

?

On 02/23/2013 09:05 AM, Dave Daniel wrote:
> Presumably the spec may thus be interpreted as "17 conductors of #20 AWG and 34 conductors of #28 AWG".

Dang! Is it really 20 Gauge? I just found some surplus fire sale 22 AWG ribbon cable for sale...
 

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No, these AWG 28 wires are for the (unused) signal connections. The spec is "17 wires of #20 AWG and 34 wires of #28 AWG". I can send you the Tek manual if that is useful. There have been some subsequent posts about how these wire were connected in the extender.

It took Egge's comments and a bit of research to figure this out.

Cheese,
DaveD


On 2/23/2013 6:41 PM, John Griessen wrote:

?

On 02/23/2013 09:21 AM, Egge Siert wrote:
> Good point. I accidentally switched the last two. It is indeed 34/28 AWG.

Hi Egge,

Is it that thin? 34 AWG and 28 AWG? Those are power handling wires for the
pass transistors, and 28 seems thin...
 

No that is 34 wires of 28 ga


Regards,
David Partridge

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of John Griessen
Sent: 24 February 2013 01:42
To: TekScopes@...
Subject: Re: [TekScopes] Re: TM500/5000 Extender Cable Wire Gauges

On 02/23/2013 09:21 AM, Egge Siert wrote:
Good point. I accidentally switched the last two. It is indeed 34/28 AWG.
Hi Egge,

Is it that thin? 34 AWG and 28 AWG? Those are power handling wires for the pass transistors, and 28 seems thin...


------------------------------------

Yahoo! Groups Links
 

--- In TekScopes@..., John Griessen <john@...> wrote:

On 02/23/2013 09:21 AM, Egge Siert wrote:
Good point. I accidentally switched the last two. It is indeed 34/28 AWG.
Hi Egge,

Is it that thin? 34 AWG and 28 AWG? Those are power handling wires for the
pass transistors, and 28 seems thin...
-----------------
Here's the Data Sheet and wire specs.

/H?kan

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