Re: [volt-nuts] Matched resistors

2014-07-21 Thread Bob Smither
error that is mentioned. There is also a 6 nA (typical) leakage mentioned. During the hold time ( about 1 msec) of the output 1 ufd cap this comes to 6 uV. Regards, Bob Smither attachment: smither.vcf___ volt-nuts mailing list -- volt-nuts@febo.com

[volt-nuts] Data Precision 3600

2013-09-12 Thread Bob Smither
Does anyone know the basic specs for a Data Precision 3600 - resolution, accuracy? Thanks! -- Bob Smither, PhD Circuit Concepts, Inc. = If you don't read the newspaper you

Re: [volt-nuts] Fluke 510A

2013-08-10 Thread Bob Smither
purchased three 3457As on Ebay. They are always on and I have had no problems with them. They are my current favorite DMMs. All three indicate within a few ppm at +10.0 volts (I have not adjusted / calibrated them). I think HP got a lot right with the 3457A. Wish I could afford a 3458A! -- Bob

Re: [volt-nuts] (no subject)

2013-07-28 Thread Bob Smither
owner (actually three)) -- Bob Smither, PhD Circuit Concepts, Inc. = Blessed is he who expects no gratitude, for he shall not be disappointed. -- W. C. Bennett

Re: [volt-nuts] 731A output impedance

2012-11-27 Thread Bob Smither
easy! The lm301 is protected against shorts to ground. Thanks to all who added to this thread. -- = Bob Smither, PhD Circuit Concepts, Inc. I've come to realize that protecting freedom

[volt-nuts] 731A output impedance

2012-11-26 Thread Bob Smither
protection to the op-amp and may be a factor in the op-amp stability. Other than the above, can anyone see why this would be a bad idea? Thanks, -- Bob Smither smit...@c-c-i.com Circuit Concepts, Inc. 281-331-2744

Re: [volt-nuts] Traveling Standards

2012-10-19 Thread Bob Smither
On 10/18/2012 02:05 PM, Andreas Jahn wrote: Hello Bob, whats the matter with you. Infected by precision virus like me? You wanted to have a standard with about 10ppm and now you blame a 3-4ppm drift. :-) - afraid so Andreas! The LM199A is hermetically sealed. The PCB, the 8K

Re: [volt-nuts] Traveling Standards

2012-10-02 Thread Bob Smither
On 09/22/2012 02:24 PM, Bob Smither wrote: I just dropped off the Volt-Nuts TS at my shipper, headed to the fourth volunteer for this project. I will report his measurements as they become available. Some drift data provided by the fourth volunteer is now available here: http://c-c-i.com