Reference voltage 0 to 10V at 0,05%

Hi,The realization of my voltmeter Bluetooth need a reference voltages for testing. I suggest mounting around a PIC16F690, LCD display, adjustable by buttons and ADC (24 bits) and DAC circuit. The voltage would be 0 to 10V with an accuracy of 0.1% with 100mA and relay to connect or disconnect (reset button).

Hi,

The realization of my voltmeter Bluetooth need a reference voltages for testing. I suggest mounting around a PIC16F690, LCD display, adjustable by buttons and ADC (24 bits) and DAC circuit. The voltage would be 0 to 10V with an accuracy of 0.1% with 100mA and relay to connect or disconnect (reset button). What do you think?

Jennifer

21th Fevruary 2014

it's easy to increase the temperature. But against, with a fan, it is obtained that the ambient temperature. Is it really necessary to make a Peltier cooling system and therefore the cost?

3rd June 2014

The box begin to look fine

Jennifer

Discussion (2 comments)

Lucky 10 years ago

I think Clemens means that the project should have some means of compensating for temperature drift of the reference.

Regards,

Luc

ClemensValens 10 years ago

Luc is right. Usually instead of cooling the system to a known temperature it is heated to a known temperature above ambient, say 50 degrees Celsius. To do this the sensitive parts are placed/glued together with a heater (usually a transistor), sometimes even put within an enclosure. There used to exist transistor chips with special heating transistors integrated. Regards, Clemens

Aubinais 10 years ago

Yes with compensating of temperature with Peltier system Jennifer

2 Comment(s)

ClemensValens 11 years ago

Hi Jennifer,

That sounds like an interesting project. Are you also planning to take temperature compensation into account?

Regards,
Clemens

Aubinais 11 years ago

Hi Clemens, suggest you put a small heater near the reference voltage circuit in a small box? Do you see that it isn't a project with a Bluetooth module :-) Jennifer