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Sheetal.Pandey
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Fun
Sheetal.Pandey   6/27/2014 4:57:00 AM
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I tried answering all the questions. Enjoyed short and seet. Got few of them correct. This is nice. May be we can have these coming on every fridays...good learning.

David Ashton
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Re: Fun
David Ashton   6/27/2014 6:40:08 AM
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Thanks as always Martin.  Got 3/5 - came short on the language one and no 5.  Should have known better on this one as I have come across it before.  Silly idea though, if they have a unique letter, what's the point of putting the number?

Measurement.Blues
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Re: Fun
Measurement.Blues   6/27/2014 11:10:51 AM
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Sheetal (and everyone else).

I used up my one and only set of questions that were already done. I will tyr to run them one in awhile and perhaps you can help. Please send questions to me at martin.rowe@ubm.com. I'll compile them and post.

speff
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Re: Fun
speff   6/30/2014 12:32:45 PM
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Got them all- I guess I must be an instrument guy. LOL.

I'm not convinced you can't use type B below 0°C but it has a nasty hook around there where it reverses slope, so a given mV can map to more than one temperature, and nobody that I've seen has bothered to measure the mV below 0°C (the only reason to use such a nasty Pt-Rh thermocouple is if you have to go up to very high temperatures (>1500°C)).

Andrewier
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Re: Fun
Andrewier   7/3/2014 3:06:00 PM
@David Ashton

I am not sure if we are talking about the same (or my bad English is tricking me), but... let it go:

If the matter is DB x DE connector designations, the first letter (D) is for 'D' type (or trapezoidal), second - A,B...E is for shell size and the number, for the number of pins, of course. For example, we can have DB25 and DB31 - same shell size but different number of pins. The same for the - once ubiquitous - DE9 (PC serial port) and DE15 (aka VGA) .

Regards,

AW.

 

David Ashton
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Re: Fun
David Ashton   7/3/2014 4:23:01 PM
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@Andrewier....Thanks for that, very well put, I'd forgotten about VGAs.  I guess there  is some sense to it.   Are you sure about DB-31 - I remember seeing a high denisty plug the sdame size as a DB-25 but (like a VGA) with 3 rows of pins, but there would have been a lot more than 31 there....

Andrewier
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Re: Fun
Andrewier   7/3/2014 5:52:10 PM
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@David Ashton... I am glad to be of help, despite my limited English abilities. From what I remember ITT Cannon and Amphenol used to have all sorts of D-Subs, 2 and 3 rows kinds with odd countings like 25, 31, 36, 37, 51 and so on. Also interesting to note that shell size grows in order A, B, C, D and suddenly shrinks to E, the smaller of all shells. I remember that was a heavy nightmare to understand the Cannon catalog in order to build a proper P/N for ordering. I used to buy it for geomagnetic sensors, requiring shells and everything else to be made of non magnetic alloys, as brass or aluminum.  It was a real challenge requiring double checking (usually more than one person) to make shure we wouldn't buy very expensive wrong parts!

David Ashton
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Re: Fun
David Ashton   7/3/2014 6:24:09 PM
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@Andrewier...."despite my limited English abilities."   Please don't apologise, if my command of other languages (French and Afrikaans in my case) was as good as your English, I would be a happy man!

I've also seen D-subs with coax connectors in them as well as pins.  Pretty rare though.  And they are also confusing in what is male and what is female the shells have a different sense to the pins.  I stick with Pins = male which seems right most of the time.   Don't you hate it when you misinterpret the catalog and you end up with wrong parts????

MeasurementBlues
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Re: Fun
MeasurementBlues   7/6/2014 12:06:02 AM
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@Andrewier, you are correct about the letters indicating connector shaoe and shell size. Click on the image for the source.



 

 

MeasurementBlues
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Re: Fun
MeasurementBlues   7/6/2014 12:10:38 AM
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@David,

When I worked at the long gone GCA, We used B-side connectors with heavly wires and pins for carrying power to modules uses in wafer-processing stations.



 

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