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Author Topic: Voltage divider on the output of a voltage reference - Tests and considerations  (Read 1113 times)

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Offline Kiriakos GR

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This is a quick presentation of my very own voltage divider construction which now serves at dividing 10V voltage reference voltage down to 5 Volts.
At the moment my most high resolution multimeter this is BRYMEN BM869 at 500.000 counts at 5V range 0.02% accuracy.
In order to use this rich resolution that is equal to old times benchtop 6 ½ meters, I was forced to create my very own voltage divider.
Project success did not come easy, I was have to spent significant time to trim the circuit so it voltage output to be adjusted at wanted detail.

Resistors selection this is Vishay Film 0.1% 10K.
Resistor divider consumption this is 0,5 Milliamperes.
Voltage output this was adjusted (circuit trim) to match impedance of 10 Mohm multimeters.

I had to take apart one BNC to dual banana plug (cheap version) so to obtain two male banana 4mm pins, which was soldered over the PCB, underneath banana plugs they Plug-in directly to voltage reference female bananas.

Therefore I did create a Plug-In resistors divider, easy to use, easy to remove.

My learning curve by experimenting on this project it did loaded me with new experiences.
Several hours of data logging made it clear to me amount of noise floor of BM869 in microvolts (ADC noise), and that I can not go any further exploring my voltage reference stability with out using a higher in class multimeter.
My small victory this is enjoying four zeros stability and the fifth last digit this is simply an indicator of ADC noise.

I am using third party Japanese software as data logger, six digits resolution and graph chart with 100 microvolt stepping.
BM869 this is a feature rich and accurate multimeter which seems as equal or better performer compared to Fluke 8842A, but BM869 this is very sensitive to temperature change, even by measuring a true stable reference in the range of 23C down to 17C there is about 14 counts drift to lower value.
I am now thinking to create a thermally isolated (storage box for data logging) for it, with active heating and thermostat so this staying at 23C day and night.
The major advantage of Fluke 8842A this is great stability as soon it gets warm to 22 Celsius due it own ACV transformer.
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