[volt-nuts] Precision resistors

[Richard Moore]

Check with Edwin Pettis at Ultrohm in Grand Junction, Co. H ewinds superb ww resistors using Evanohm wire with tempcos under 3ppm/degC, with 0.01% tolerance for around $14 each. I’ve bought some and have been extremely pleased. Don’t know the largest he can make or at what price…

pettiseng at q.com

Dick Moore


> Message: 1
> Date: Thu, 6 Aug 2015 16:25:54 +0100
> From: "David C. Partridge" <david.partridge at perdrix.co.uk>
> To: "'Discussion of precise voltage measurement'" <volt-nuts at febo.com>
> Subject: [volt-nuts] Precision resistors
> Message-ID: <5D9EFA13BAB94DCA901607C1EDEA4911 at APOLLO>
> Content-Type: text/plain;	charset="UTF-8"
> 
> Looking for a set of precision resistors for calibration purposes.
> 
> I need the following values to calibrate the ohms ranges on my meters:
> 
> 	100
> 	1k
> 	2k
> 	10k
> 	20k
> 	100k
> 	200k
> 	1M
> 	2M
> 	10M
> 	20M
> 
> The crucial factor isn't that they be *exactly* the values above, so I don't necessarily need 0.001% parts.  Low TCR is important, and I will need to know that actual values to 10ppm or better.
> 
> I'm looking for suggestions on the best choice of parts and pricing?  I believe the Vishay HZ series may fit the bill for the lower values but they may be rather expensive.
> 
> Regards,
> David Partridge