This listing is for international buyers who want direct USPS shipping. Email and we will put you on the buyer exemption list. The item is the Calibratory D-105 DC, 10.0VDC Precision Voltage Reference Standard. It accepts 12VDC to 35VDC INPUT. The OUTPUT is 10.000000 VDC ±0.0002% (±2ppm) at 14.5VDC (+-2.0VDC) INPUT. The other unit we have listed—The D-104 DC—is a +-0.0006% (+-6ppm) unit. That, temperature-control, and the price, are the only difference between this unit: the D-105 DC and our novice product, the D-104 DC. The D-105 DC has (4) four color-coded, gold-plated banana-sockets w/binding posts for INPUT and OUTPUT connections. The internal connections are soldered or bolted. The regulator IC is socketed, so it is not heated by soldering. We incorporate the precision voltage reference IC—TI REF102C—together with noise filtering, thermoelectric damping, and a trim circuit. Among the photos is a laboratory null voltage-offset setup. The reading is on the mVDC range. The meter reads: 0.0092mVDC (9.2uVDC; 0.92ppm). That is the maximum difference between the 732A 10.000000VDC OUTPUT and the 10.000000VDC OUTPUT of the Calibratory D-105 DC Precision Voltage Reference Standard at its maximum actual error. Our claim of +-2ppm at 10VDC is conservative! The null setup is as follows: Fluke 732A OUTPUT (-)ground(-) to OUTPUT (-)ground(-) on the Calibratory D-105 DC Precision Voltage Reference Standard. Power Supply 14.5 Volt DC (+) and (-) to INPUT of the Calibratory D-105 DC Precision Voltage Reference Standard; (+) 10.0VDC (+) OUTPUT of Fluke 732A to DMM (-) low (-); (+) 10VDC (+) OUTPUT of Calibratory D-105 DC Precision Voltage Reference Standard to (+) DMM (+). All units are nulled to a 732A or 732B Precision Voltage Reference. Recalibration is available anytime. The Calibratory D-105 DC Precision Voltage Reference Standard may also be powered by (2) 9V alkaline batteries wired in series. The device settles in roughly five minutes. Maximum output load is 10.0 mA. The unit is durable and maintenance-free. Long-term drift is <1.5ppm/1,000 hours of use, and decreases with age. The unit measures approximately 1.5" x 2.25" x 1.75". Test equipment and patch cords are not included. Questions, use the link below. Thank you for viewing our eBay.com listing! We customize calibration parameters for free, i.e. input voltage, temperature, output load, etc.. You've now read the description. For some background, read on! Years ago I wanted something cheap and portable--even implantable--to calibrate hand-held DM meters. So, I took a bare IC and soldered it to a board, connected some wires between the pins and banana sockets; and voila, POOF, a voltage standard was born. It was little better than a standard cell, but it was better. I decided to check eBay for more ICs, and I found 9 of them at a great price. I built 9 more standards and sold them for 29.95 ea.. After that I read engineering notes on analog circuits, from TI and LT. Over a series of years the design has added filtering, noise cancellation, thermoelectric-effect suppression, high-granularity trimming, temperature compensation, dynamic settling, high-accuracy output, low drift, silicon aging, miniaturization, output jitter-damping, resistive balance, safety features, and excellent repeatability. I have a scientific background, so I just had to learn the analog application side. I aimed at the amateur market, because calibration labs were treating them poorly! Now they don't need them! I've been advised that I ought to raise my prices, because the level of accuracy we provide could interfere with the viability of competing products, save that we compete "fairly"! We sell our products to buyers on every continent but Antarctica. We sell to industry, Universities, public utilities, governments, and individuals in 25-30 nations spanning the globe from The USA to China and Japan, in both directions. We believe the best way to make money is work! Our prices are fair and equitable. We're expanding every day to supply the world with an exceptionally unique and valuable device. Our hope is to use the experience we've gained to begin development of a 5.0VDC and a 2.7VDC standard equal to or better than our 10VDC standard. Shall we pick these claims apart one at a time?
Let's start with "temperature control".....where is it? Please don't claim the "passive heatpipe technology" thing again....it will only serve to make you look fraudulent....
Next up....you claim "5 minutes settle time"......yet here you JUST CLAIMED "
The D-105 DC will not read correctly during a change in temperature. The temp must remain constant for at least an hour. It is best to power the unit off until equilibrium has been reached. The problem arises because of the greater difference in temperature between the tempco thermistor and the IC that occurs during a temperature change."
How can the temp remain constant, in the IC during power up, over a 5 minute span? That defies Ti's own claims about what is possible with their device.....and then you further muck it up by making up some nonsense about "tempco thermistor"....and that it needs an hour to settle, after a temperature change....if your heatpipe technology works...are you seriously claiming it reaches a controlled temp INSTANTLY and somehow INSTANTLY finds an equilibrium with the internal temperature of the buried zener in the MONOLITHIC REF IC PACKAGE...!!!?
HUH.....which one is it?
Letr's start there and then bring up the other claims in your ebay listing....which are NOT demonstrated with ANY actual data....
Oh and THE BIG ONE.....what the hell do you even mean +/- 2 ppm? Do you mean +/- 2 ppm of the initial output (after settling) of 10 V? What is miraculous about that....any idiot can twist the screw on a trimmer.....
you also claim less than 1.5ppm drift per 1k/hrs.....ok where is the data to back that? Show me the 30 day, 60 day 365 day etc etc etc....I see NO data!!! Just claims....
on and on and on and on......I know I am just feeding a troll here, but I find you about as amusing as the "free-energy" "overunity" guys.....and I find them utterly hilarious....
So again PROVE me wrong...with data....I am waiting to eat my hat and bow down to your god, for bending the laws of physics...which he himself created.....
"God doesn't play dice" -
smart guy "
jitter-damping".....
can you also explain how you achieved any useful "noise reduction"...without using gain after the filter to make-up for loss? The REF102C doesn't have the ability to add gain significant to make-up for loss in a "passive filter". I mean if you want to reduce noise at 10Hz, you most certainly need to employ an op-amp and supporting components.....which Ti's own data sheet graciously shows you how to do....and you claim in your description to have read those documents....in case you actually did NOT read them.....here you go....
"high granularity trimming"....
Ti actually even tells you that trimming the output will ADD drift to their specs.....those don't exactly look like "precision trimmers" to me.....the better solution is a precision resistor network and some nice switches....to avoid the potential problems of "bottom of the barrel trimmers", which you haven't secured the wiper screw on after "calibration". Your "heater" is literally almost touching the trimmer case....so don't you think after some time the thermal expansion and contraction of that trimmer case, and the lack of locking the trimmer adjust....might just lead to some problems? That is if your heater does what you claim it does (rhetorical, because we all know it doesn't).
where are all these precision "miraculous" pieces of technology you invented? I don't see them....again I just see a rather shoddy implementation of Ti's own application notes.....and even then you aren't using suggested tolerance components....and just to be clear I am NOT talking about the "crudity" of the assemble....simply the "quality" of the parts used
"
our prices are fair and equitable"......yet you charge more than double the price for the "added temperature control"....which consists of a $0.03 passive component and a scarp of foil? and again does NOTHING to support your claim of "passive heatpipe technology" and "precision temperature regulation"....show me the data on how that is doing ANYTHING to stabilize the REF IC....
you should provide a link to this thread on your ebay listings....so potential customers can come here and see just what it is you are selling.....
If you are confident that you are representing honesty, integrity and sanity....then you should have no fear of doing that
now if you really want to sell your product....you should go post it here
http://overunity.com/...because those folks just might believe your bullshit claims.....you will fit right in there