[volt-nuts] Precision resistors

[Todd Micallef]

David,

Depending on the time frame needed for these resistors you can order many
(but not all) of the parts from Farnell. I believe the Rhopoint resistors
are the recommended brand. The high value resistors could be Caddock USF
series.

Another alternative would be to contact Edwin Pettis. He manufacturers
custom resistors and does ship internationally. He is working on a
'project' for me that requires a replacement precision resistor. I am not
sure if he can make the highest values.

Your other alternative would be to order a couple of these
http://www.precisionresistor.com/Digital-Multimeter-Calibrator/

They have made me some custom sets, so I know it can be done. The 10M
resistor prices are extremely high and the turn around for the custom sets
can be long. They do not make 20M WW resistors last time I checked. You
will probably still need to buy separate resistors from Caddock.

I am guessing the Fluke 5450A is difficult to get or is too expensive where
you live.

Todd

On Thu, Aug 6, 2015 at 11:25 AM, David C. Partridge <
david.partridge at perdrix.co.uk> wrote:

> 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
>
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