Guildline Instruments

[EEVblog]

Didn't know about this company.

10000A precision current source  among tons of other cool stuff

http://www.guildline.ca/primary-electrical-metrology/highest-level-standards/precision-current-sources

[Vgkid]

Another neat company to look into is mintl (Measurements International) another Canadian firm.

[Conrad Hoffman]

I own one Guildline item, a resistance standard that all the oil leaked out of. Still accurate though. They make cool stuff, but make sure you're sitting down if you read their price list.

[nidlaX]

I've seen a lot of their older gear go for low prices on eBay, including rebadged Solartron multimeters.

[0.01C]

I like Guildline ,I own two guildline hamon resistor ,10R & 1k and two guildline thermometer.

[Moon Winx]

I heard they used to have great products but not so much anymore and my experience is consistent with that. I haven't seen issues with their passive DC resistance products (shunts & resistance standards) but their electronic stuff seems to be a mess.

Measurements Intl, who I think sucked the talent from Guildline, has awesome hardware but just about all of it requires the use of their software. And their software, while powerful, looks like it was developed in the 90s and never updated.

[TiN]

And I have one or two Guildline 9330 resistance standards.
Guildline known for their bridges, with up to 10.5 digits of resolution 

[Echo88]

I would love to see a teardown of one of those Guildline DCC-bridges. But i dont assume one of you bought a puppy like these?: http://www.ebay.com/itm/Guildline-9975-Current-Comparator-Resistance-Bridge-W-9460B-Amplifier-/232423995926?hash=item361d8cba16%3Ag%3A48cAAOSw0RlZd4tN&nma=true&si=FFB3esL5JW%252FJYx36Gm25uUH7JpQ%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557

[TiN]

Nah, way to unshippable. 

[CalMachine]

Guildline makes (or atleast used to) some phenomenal equipment.  As others have stated, I've got mostly their passive stuff, no electronic equipment.

Here is a recent one we picked up!

[ManateeMafia]

I have one of their 9520 teraohmmeters . It's a beast but can be calibrated with a single 10M standard resistor and beats a lot of meters in the high G/T ohms ranges.

[lowimpedance]

Those 'Brown Laminex' baths just keep chugging away year after year.

 

I would love to see a teardown of one of those Guildline DCC-bridges.

Coincidentally there are 2 9975's no longer used in the store room at work , could take some pics when I get a chance.

[Echo88]

  Your firm seems to own a lot of old stuff lowimpedance. Is it somehow also the owner of the giant warehouse shown in the end of first Indiana Jones movie?

[hwj-d]

Looks like a kitchen sink. Could it cook coffee?

[Echo88]

Thanks to a hint from the user "0.01C" i was able to find the article from zlymex about a Guildline 9975-teardown: http://bbs.38hot.net/thread-4488-1-1.html   

[lowimpedance]

That is pretty comprehensive a teardown.
What ever happened to Zlymex ?, just stopped comming to this forum after being quite active  . really a shame .

[jeroen79]

10000A precision current source 

What would that be used for?

[manganin]

10000A precision current source 

What would that be used for?

https://www.nist.gov/news-events/news/2013/01/minimizing-uncertainty-current-events

[Echo88]

Maybe they also use those to imprint the current in various superconductivity coil projects, like used in CERN or for tokamak-design fusion plants.

[TiN]

Saw a lot of CERN documents, where they use Flux-gate DCCTs, like LEM Ultrastab at LHC. These beasts capable for ppm-level accuracy with kiloamps as well.
Quick Google search shows some neat setups for their current standard transfers.

[jeroen79]

10000A precision current source 

What would that be used for?

https://www.nist.gov/news-events/news/2013/01/minimizing-uncertainty-current-events

MicroOhm resistors, commonly known as a short circuit.

[Emrtech]

Dear Community,

Attached is a rare service manual for the 9540 Guildline Thermometer that includes the complete schematics.
It might be useful if you need to service your instruments. The resistance converter frontend of the design is very interesting as it makes use of an offset cancelling flying capacitor technique. All opamp offsets are elegantly eliminated using this method developed at the CRC.

Best Regards,
Gerhard

Edit: I have been advised of some problem with the file and will fix it tomorrow. Thank you for your patience.

It appears the file is too large with 2.9Mb. That is a problem. Perhaps I can split it up.

[Vgkid]

Dear Community,

Attached is a rare service manual for the 9540 Guildline Thermometer that includes the complete schematics.
It might be useful if you need to service your instruments. The resistance converter frontend of the design is very interesting as it makes use of an offset cancelling flying capacitor technique. All opamp offsets are elegantly eliminated using this method developed at the CRC.

Best Regards,
Gerhard

Your manual refused to upload correctly.

[Emrtech]

Thanks for letting me know. I will address it tomorrow. I can't upload it from my iPad.

Gerhard

[0.01C]

GL9540 service manual

http://cloud.tapatalk.com/s/5a86a63889b0a/GL9540_ServiceManual.pdf