[volt-nuts] Precision resistor testing

Charles Black cblack at centurytel.net
Sat Nov 15 18:12:35 EST 2014

I use a digital temperature controlled bath for my keeping my standard 
resistors at 25C. It's versatile since it can do precision 
temperature/time scans and can easily scan the range your interested in. 
Right now I have it set to 25.00C with one of my ancient 10K ohm standards.

When I first bought my Leeds and Northrup resistors I wanted temperature 
info on all of them to see if there was an especially good one. I was 
scanning from 20C to 30C and  writing down the resistance values at 
every 0.1C point. Like Frank mentioned, I went through the temperature 
range too fast and the data was useless do to hysteresis. Next time I 
went much slower and the data was OK. My bath has a change in 
temperature over time function so it will be much easier just to let the 
3458A measure continuously and plot the output after the run. I can use 
Labview to plot the data in real time if I get the urge to "program". 
Use NPLC = 1000 and OHMSF for best results. Because of my old Leeds an 
Nothrup reistors I have to use a DELAY of 10S. Most standards don't need 
this but it's best to compare the resistors value at a Delay of 10S and 
the default Delay. They should be identical.

I use the GPIB data port  all the time and can't live without it.


On 11/15/2014 1:48 PM, Richard Moore wrote:
> Thanks for the replies — I have all I need except an environmental test chamber to control temp. Of course, right now, I could stick the box outside and drop its temp by 20C — but I really only need a range of 20C +/- 5C. But as it turns out, I have a little portable insulated cooler/heater box for holding drinks and food in the car that has a big reversible Peltier block in it, so maybe I can finesse this temp testing…
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