Electronics > Beginners
1V Reference @ 1ppm
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beanflying:
As you already have the same reference I jotted down some figures using my matching one this afternoon against my 34401A over a few Temps. Both meter and Reference were in the same environment and you will get an idea that the combined drift is +1ppm/C @ 10V the bulk of this based on other testing will be the Vref as the Agilent is well under 1ppm over this sort of environmental range.

Interestingly the buffer used on it is not effected by loading at either 10M or 1G more than 1 least significant digit.

Mainly done for me to upgrade the data for it after a years use. These cheapies are far from terrible for3.5 and 4.5 digit meters. You might even do reasonably putting a divider across one of these too just keep the values fairly high to minimize loading but still make your own as well ;)

                                                                               25C
Nominal       25C               28C             32C          old data
2.5           2.49905        2.49908       2.49912       2.49905
5.0           5.00024        5.00027       5.00032       5.00021
7.5           7.49961        7.49964       7.49968       7.49955
10          10.00036      10.00039     10.00045     10.00028
beanflying:

--- Quote from: imo on January 27, 2019, 09:47:54 am ---The answer is simple: there is not such an 1V/1ppm source available in form you would expect (not talking volnuttery capable calibrators). As I can see on the pictures from your link you are already volnut-positive, so you are asking in a wrong section :)

--- End quote ---

More than that without a base standard you have nothing to reference it to so you need to do the best you can and are happy with unlike volt nuttery. You can make all the LTZ references you like and still not know what a volt is.
Rafael:
Accuracy and stability really make me happy. Having an equipment and believing in your measurements fascinates me. This antique equipment, Russian, is in excellent condition (at least cosmetic) and I want to get to a point in having vintage equipment with nixie displays and precision.

I've invested a few hundred dollars in parts and calibration devices.  :palm:  |O But I still do not feel safe to calibrate my other equipment! I have older nixie-based devices clamoring for calibration, such as Meratroniks, Fluke, etc ... They leave any bench happy.  :-+
beanflying:
Not sure if this is widely known around the world but there is an adage "A man with a watch knows what time it is. A man with two watches is never sure." and that is clearly why a third and a forth and a fifth.. Meter is needed. Welcome to TEA.  ;)

While I am comfortable with what standards and calibration equipment I have available is more than what I need my journey down the voltnut rabbit hole  is heading toward a 3458A and paying keep it in Calibration so I can start with a proper traceable voltage among others. If the budget doesn't allow it this year then my 34401A will get re calibrated by Keysight to get me a little closer to the truth and allow me to go over all of my other gear with good certainty.

I have a few Nixie meters in my collection there is just something about the glow 8)
spec:

--- Quote from: beanflying on January 27, 2019, 01:42:13 am ---To get the divider of 6 and 4k (assumed dead accurate) you would actually get 0.9996 volts read assuming the nominal 2.5V 10Meg meter.
--- End quote ---
which is -240ppm


--- Quote from: beanflying on January 27, 2019, 01:42:13 am ---So it would need the compensation pot fitting to the circuit to tweak it accordingly if it's purpose is for calibration and if not the input impedance of the driven circuit needs to be taken into account regardless.
--- End quote ---
This seems to defeat the whole purpose of a precision voltage source, or have I missed something?

The switch from virtually no load, to a relatively heavy load of 10M has changed the whole aspect of the design.
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