Re: [volt-nuts] Desperately seeking OPTION 10 for Datron 4708
Thank you for the bad news :( I am starting to come to terms with the difficulty of finding this option. I have recently discovered that option 10 from the 4700, 4705, and 4707 would also work. Not sure if this makes it any easier. Also my unit has a sticker on the front indicating ac voltage and current only... But lists options 20,30,80,90 on the backside label. Will my unit have resistance functionality? I am hearing a lot of conflicting information. Not sure if I am replying to emails correctly. (New to volt nuts) On Jul 12, 2014 6:03 PM, Chris caal...@gmail.com wrote: Nobody has access to spare Datron 4708 stuff? I am willing to pay international shipping etc... whatever it takes! Thank you On Thu, Jul 10, 2014 at 2:09 PM, Chris caal...@gmail.com wrote: I am looking to purchase OPTION 10 slide in board for the Datron 4708 Multifunction Calibrator. If anybody has a parted out unit and can sell me just the option 10 board i would appreciate it dearly! Thank you for considering! Chris ___ 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.
Re: [volt-nuts] Desperately seeking OPTION 10 for Datron 4708
Chris, I believe the current and resistance functions are on the same board. My 4700 is missing one board and it has both missing features. Todd Sent from my iPad On Jul 16, 2014, at 8:48, Chris caal...@gmail.com wrote: Thank you for the bad news :( I am starting to come to terms with the difficulty of finding this option. I have recently discovered that option 10 from the 4700, 4705, and 4707 would also work. Not sure if this makes it any easier. Also my unit has a sticker on the front indicating ac voltage and current only... But lists options 20,30,80,90 on the backside label. Will my unit have resistance functionality? I am hearing a lot of conflicting information. Not sure if I am replying to emails correctly. (New to volt nuts) On Jul 12, 2014 6:03 PM, Chris caal...@gmail.com wrote: Nobody has access to spare Datron 4708 stuff? I am willing to pay international shipping etc... whatever it takes! Thank you On Thu, Jul 10, 2014 at 2:09 PM, Chris caal...@gmail.com wrote: I am looking to purchase OPTION 10 slide in board for the Datron 4708 Multifunction Calibrator. If anybody has a parted out unit and can sell me just the option 10 board i would appreciate it dearly! Thank you for considering! Chris ___ 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. ___ 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.
Re: [volt-nuts] Desperately seeking OPTION 10 for Datron 4708
Chris, I am aware that Low Thermal Low Electronics www.lowthermal.com/wavetek-datron/470x.php does specialise in the repair of older calibrator in particular Datron Wavetek. I did query them at one stage about there spares situation and they did say they did have or could source spares for most Datron meters and calibrators. I image that their prices will not be cheap but they may be worth a try if you are desparate. I have no relationship with Low Thermal I have just being a satisfied customer in the past. Kind Regards, Stephen Grady Sydney Australia -Original Message- From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On Behalf Of Chris Sent: Wednesday, 16 July 2014 10:48 PM To: volt-nuts@febo.com Subject: Re: [volt-nuts] Desperately seeking OPTION 10 for Datron 4708 Thank you for the bad news :( I am starting to come to terms with the difficulty of finding this option. I have recently discovered that option 10 from the 4700, 4705, and 4707 would also work. Not sure if this makes it any easier. Also my unit has a sticker on the front indicating ac voltage and current only... But lists options 20,30,80,90 on the backside label. Will my unit have resistance functionality? I am hearing a lot of conflicting information. Not sure if I am replying to emails correctly. (New to volt nuts) On Jul 12, 2014 6:03 PM, Chris caal...@gmail.com wrote: Nobody has access to spare Datron 4708 stuff? I am willing to pay international shipping etc... whatever it takes! Thank you On Thu, Jul 10, 2014 at 2:09 PM, Chris caal...@gmail.com wrote: I am looking to purchase OPTION 10 slide in board for the Datron 4708 Multifunction Calibrator. If anybody has a parted out unit and can sell me just the option 10 board i would appreciate it dearly! Thank you for considering! Chris ___ 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. --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com ___ 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.
[volt-nuts] Matched resistors
I am building a 10V voltage reference based on the LTZ1000 and the design is essentially done but I am looking for a pair of matched resistors that track very closely over temperature. The absolute value of the pair is not important, anything between 50K and 200K ohms would be ideal, but the matching ratio is very important. I looked at the 100K ohm LT5400 quad resistor array from Linear Technology but it has a worst case long term accelerated shelf life spec of 10 ppm (at 150C) matching ratio and long term matching ratio drift of 4ppm (at 70C). I would like something much tighter if possible since that would mean I likely don't need an oven for a couple of ppm worst case accuracy over time and temperature. I can make the LT5400 work but I would need to do temperature characterization and circuit compensation. Doable but undesirable. Does anyone have any ideas for a good ratio matched resistor pair, hopefully not too expensive? Thanks, Randy Evans ___ 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.
Re: [volt-nuts] Matched resistors
Hi Randy; I would look at Visha Foil resistors http://www.vishaypg.com/docs/63120/hzseries.pdf Hope that helps. Cheers; Thomas Knox Date: Wed, 16 Jul 2014 17:44:10 -0700 From: randyevans2...@gmail.com To: volt-nuts@febo.com Subject: [volt-nuts] Matched resistors I am building a 10V voltage reference based on the LTZ1000 and the design is essentially done but I am looking for a pair of matched resistors that track very closely over temperature. The absolute value of the pair is not important, anything between 50K and 200K ohms would be ideal, but the matching ratio is very important. I looked at the 100K ohm LT5400 quad resistor array from Linear Technology but it has a worst case long term accelerated shelf life spec of 10 ppm (at 150C) matching ratio and long term matching ratio drift of 4ppm (at 70C). I would like something much tighter if possible since that would mean I likely don't need an oven for a couple of ppm worst case accuracy over time and temperature. I can make the LT5400 work but I would need to do temperature characterization and circuit compensation. Doable but undesirable. Does anyone have any ideas for a good ratio matched resistor pair, hopefully not too expensive? Thanks, Randy Evans ___ 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. ___ 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.
[volt-nuts] Matched resistors
Randy, resistor matched in T.C. are extremely expensive, as the manufacturer (or yourself) would have to select these from a batch of many samples. reistors with very small T.C. (1ppm/K) would do the job also, but they also need to be stable over time, in shelf life opereation mode, i.e. P10mW. That means, you need those hermetically sealed VHP202Z from Vishay, T.C. is typically 1ppm/K and they are stable to 2ppm over 5years. But they cost already 80€ each, depending on tolerance. I made a longterm observation of these and found these parameters confirmed. Frank ___ 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.
