Test Equipment Anonymous (TEA) group therapy thread

[worsthorse]

digging through boxes for useful stuff and decided that I absolutely must have my collection of data books at hand. here's the first batch:



still have to find a place for another set of shelves to get out the TI yellow book set and another twenty or thirty smaller vendors. 

welcome to 1985!   

[Specmaster]

Unusual Fluke pr0n. Axillary temperature measurement fun. So that's 39.8oC  . Have calibrated it against my Welch Allyn unit and it's bang on.



Parametamol (tylenol for you yanks) time 

For accurate temperature readings you need a proper medical thermometer, you're probably not as hot as that. 

[Mr. Scram]

K type thermocouples are only good to +- 1-2 C so not up to human monitoring.

I was getting at that but could have been more clear. 

[bd139]

I’ve got a proper Welch Allyn Suretemp unit as well (which cost more than the Fluke and is definitely medical grade!). I was using it for comparative measurements to see if the Fluke was any good for this purpose. It turns out that it is within 0.1oC of that unit on any measurement so far at least within the limited axillary range. Seebeck coefficient depends on impurities so you can’t just grab a thermocouple off the shelf and use it but you can calibrate one. I have to keep myself busy. Now I’m worrying about thermocouple ageing. I could turn into a temperature nut 

Incidentally temperature improved and feeling a bit better. The human immune system is a rollercoaster but quite effective.

[Specmaster]

I reckon it could be that food you had delivered last night

[beanflying]

I’ve got a proper Welch Allyn Suretemp unit as well (which cost more than the Fluke and is definitely medical grade!). I was using it for comparative measurements to see if the Fluke was any good for this purpose. It turns out that it is within 0.1oC of that unit on any measurement so far at least within the limited axillary range. Seebeck coefficient depends on impurities so you can’t just grab a thermocouple off the shelf and use it but you can calibrate one. I have to keep myself busy. Now I’m worrying about thermocouple ageing. I could turn into a temperature nut 

Incidentally temperature improved and feeling a bit better. The human immune system is a rollercoaster but quite effective.

Don't do it it gets expensive 

https://www.eevblog.com/forum/testgear/kaye-140-4-ice-point-reference/msg2412237/#msg2412237
https://www.eevblog.com/forum/buysellwanted/wanted-quality-rtd-or-up-to-and-including-a-working-sprt/msg2384448/#msg2384448
https://www.eevblog.com/forum/testgear/sika-18600e-dryblock-temperature-calibrator-teardown-pictures-testing/msg2249781/#msg2249781

[bd139]

I can only go ooooh and aaaah at that 

[bd139]

I reckon it could be that food you had delivered last night

Nah that is responsible only for extremely hot farts 

[Specmaster]

Hot and smelly, could have raised the room temperature up to 39C 

[Mr. Scram]

https://www.eevblog.com/forum/testgear/kaye-140-4-ice-point-reference/msg2412237/#msg2412237
https://www.eevblog.com/forum/buysellwanted/wanted-quality-rtd-or-up-to-and-including-a-working-sprt/msg2384448/#msg2384448
https://www.eevblog.com/forum/testgear/sika-18600e-dryblock-temperature-calibrator-teardown-pictures-testing/msg2249781/#msg2249781

Both boiling water and melting ice make remarkably accurate ad hoc standards.

[bd139]

Yep that’s what the earlier flukes suggest using for calibration in the service manuals.

[beanflying]

Nothing wrong with an Ice Slush or Boiling water for most but they are the 3 1/2 digit DMM version against a 6 1/2 digit requirement for me

I have been playing with an idea on the bench that needs 0.1C accuracy so I need to be well inside that on my end.

** for Boiling point use Demin water and do the altitude correction thing too for those not in the know!!

[Kosmic]

Interesting info from NIST about Ice melting point calibration.

https://www.nist.gov/system/files/documents/2017/04/28/Ice-Melting-Point-Validation-Method-for-Data-Loggers.pdf

[tggzzz]

https://www.eevblog.com/forum/testgear/kaye-140-4-ice-point-reference/msg2412237/#msg2412237
https://www.eevblog.com/forum/buysellwanted/wanted-quality-rtd-or-up-to-and-including-a-working-sprt/msg2384448/#msg2384448
https://www.eevblog.com/forum/testgear/sika-18600e-dryblock-temperature-calibrator-teardown-pictures-testing/msg2249781/#msg2249781

Both boiling water and melting ice make remarkably accurate ad hoc standards.

... Provided you correct for air pressure.

In the UK at sea level the boiling point of water could have been as low as 97.6C.

[Mortymore]

Both thermocouples in mouth



T1 in mouth, T2 in armpit

[JXL]

Holy crap, Kosmic was right. It WILL go out to 7 digits. 

@med6753, in the 10V range pressing the "AVG" button will put the meter in averaging mode and display 7.5 digits

[Brumby]

(I do hope we don't see any more body locations offered for thermocouples    )

[Kosmic]

(I do hope we don't see any more body locations offered for thermocouples    )

https://youtu.be/fbGkxcY7YFU

[Brumby]

Do .... not .... go .... there.

[Kosmic]

heheh sorry, please don't click if you're sensible 

Technically I didn't say anything

[beanflying]

So is @med facedown in the gutter or has his internerd just gone offline?

[Kosmic]

So is @med facedown in the gutter or has his internerd just gone offline?

(Attachment Link)

He might still be working on his project in the garage.

[Brumby]

Did you not notice he was restrained under a net...?

My observation is that such means are usually reserved for targets that are dangerous if you get too close.

[med6753]

So is @med facedown in the gutter or has his internerd just gone offline?

(Attachment Link)

  No, the explanation is simpler than that. I laid down earlier in the afternoon with the intention of a short nap. Wound up sleeping many hours and right through our Discord session. Oh well.  There's always next week.

[beanflying]

So is @med facedown in the gutter or has his internerd just gone offline?

(Attachment Link)

  No, the explanation is simpler than that. I laid down earlier in the afternoon with the intention of a short nap. Wound up sleeping many hours and right through our Discord session. Oh well.  There's always next week.

So what is my prize for guessing correctly?