Fred I can only guess why you would want a mechanical Writing meter. Have you ruled out a simple 8 Plus bit ADC data logger connected to a PC such as a 10 BIT DATAQ which are/were? $25 new? Or if your application needs 16 bit resolution which is not likely due to the limitations of the 845, then a $5 sound card, modified for DC. ws ******************* [volt-nuts] Writing meter Fred Schneider pa4tim at gmail.com I want to buy a writing voltmeter to connect to my 845 so I can monitor the deviation between a Vref i made and a fluke calibrator. I can buy a philips PM 8252 or a BBC Goerz Servogor 120. The BBC is including new pens and a few rolls of paper in mind condition and 125 euro. The philips is in unknown condition but 65 euro. But these things are new for me. A friend told me some are for process monitoring and have terrible slow slewrates. He thinks the philips is a lab instrument, the bbc he does not know. Fred

Because they are nice ;-) but a digital datalogger is also on the stack. A friend who is a digital wizzard, but still a student on a budget wants a 6.5 digit meter so he is just finnished making two very good 24 bit ADC's ( they are 26 bit but functional 24 bit or something like that) coupled to arduinos and is writing the software. I gave him a 2445 scope i had surplus as a "payment" and I make the Vrefs for it and will do my best to get them as good calibrated as possible so we both have a nice meter. Fred PA4TIM Op 10 sep. 2011 om 16:41 heeft "WarrenS" <warrensjmail-one@yahoo.com> het volgende geschreven: > Fred > > I can only guess why you would want a mechanical Writing meter. > Have you ruled out a simple 8 Plus bit ADC data logger connected to a PC such as a 10 BIT DATAQ which are/were? $25 new? > Or if your application needs 16 bit resolution which is not likely due to the limitations of the 845, then a $5 sound card, modified for DC. > > ws > > ******************* > [volt-nuts] Writing meter > Fred Schneider pa4tim at gmail.com > > I want to buy a writing voltmeter to connect to my 845 so I can monitor the deviation between a Vref i made and a fluke calibrator. > > I can buy a philips PM 8252 or a BBC Goerz Servogor 120. > The BBC is including new pens and a few rolls of paper in mind condition and 125 euro. The philips is in unknown condition but 65 euro. > But these things are new for me. A friend told me some are for process monitoring and have terrible slow slewrates. He thinks the philips is a lab instrument, the bbc he does not know. > > Fred > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.

> but a digital datalogger is also on the stack. A friend who is a digital > wizzard, but still a student on a budget wants a 6.5 digit meter so he is > just finnished making two very good 24 bit ADC's ( they are 26 bit but > functional 24 bit or something like that) coupled to arduinos and is > writing the software. and I make the Vrefs for it and will do my best to > get them as good calibrated as possible so we both have a nice meter. Hello Fred, this sounds very interesting to me. Can you give any details to the conversion principle and the parts being used? With best regards Andreas

Hi andreas, As soon as I have it i will tell you. He told me but I forgot the numbers/ brands of the parts. Fred PA4TIM Op 10 sep. 2011 om 22:58 heeft "Andreas Jahn" <Andreas_-_Jahn@t-online.de> het volgende geschreven: >> but a digital datalogger is also on the stack. A friend who is a digital wizzard, but still a student on a budget wants a 6.5 digit meter so he is just finnished making two very good 24 bit ADC's ( they are 26 bit but functional 24 bit or something like that) coupled to arduinos and is writing the software. and I make the Vrefs for it and will do my best to get them as good calibrated as possible so we both have a nice meter. > > Hello Fred, this sounds very interesting to me. > Can you give any details to the conversion principle > and the parts being used? > > With best regards > > Andreas > > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.

Hi All, That sounds like it is using the LTC2442, 200nV noise at 6.9 Hz conversion rate. > From: pa4tim@gmail.com > Date: Sun, 11 Sep 2011 07:44:33 +0200 > To: volt-nuts@febo.com > Subject: Re: [volt-nuts] Writing meter > > Hi andreas, > > As soon as I have it i will tell you. He told me but I forgot the numbers/ brands of the parts. > > Fred PA4TIM > > Op 10 sep. 2011 om 22:58 heeft "Andreas Jahn" <Andreas_-_Jahn@t-online.de> het volgende geschreven: > > >> but a digital datalogger is also on the stack. A friend who is a digital wizzard, but still a student on a budget wants a 6.5 digit meter so he is just finnished making two very good 24 bit ADC's ( they are 26 bit but functional 24 bit or something like that) coupled to arduinos and is writing the software. and I make the Vrefs for it and will do my best to get them as good calibrated as possible so we both have a nice meter. > > > > Hello Fred, this sounds very interesting to me. > > Can you give any details to the conversion principle > > and the parts being used? > > > > With best regards > > > > Andreas > > >