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I would like to hire an Electronics Engineer

AC+DC voltmeter analogue front end.

I have the digital circuit complete but am in need of help for the front end from input to ADC.

The input is two terminals from which I need to create two channels for differential measurement. One ch is AC the other for DC

Circuit inputs two terminal

DC +/- 5VDC (typical, though must be tolerant of voltages up to 60VDC

AC 30Vrms(typical though must be tolerant of voltages up to 12V p-p

Power supply = single supply at [url removed, login to view]

Circuit outputs

2x channels ready for ADC (my ADC is 16bit with a PGA on the front.)

The ADC is two x differential channels +/-6vdc each.

Summary.

Split the input into two differential channels.

Ch1 ranged +/-6VDC but tolerant of higher voltages which could be shunted or blocked. To allow for this the input my need to be attenuated then amplified

Ch2 ranged +/- 6VDC (or =-6VDC you choose) where rms on the input site ~= VDC on the output side. 0 volts RMS could equate to 0VDC or -6VDC. The latter is preferable.

I would like accuracy better than [url removed, login to view] for the DC channel and better than [url removed, login to view] for the AC channel.

The high input impedance is critical I would like to avoid resistive dividers on the front end.

One idea that I have had is:

For the DC channel:

Attenuate and clamp  Instrument amp

For the AC channel:

Attenuate and clamp  Instrument amp  True RMS Converter

The outputs need to be linear with respect to input, though I can calculate scalar constants after creating the circuit.

You must provide part numbers for all IC’s and values for all passive components as well as a circuit diagram.

Compétences : Design de circuits, Electronique

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Concernant l'employeur :
( 0 commentaires ) Australia

N° du projet : #12641235

Décerné à :

microenergy

Dear Sir, Greetings from Turkey. I hope you are good. Let me introduce me. I'm Electronics Enginner who have 19 year experience. My experience is related to power electronics, hardware design, analog design, P Plus

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15 freelance ont fait une offre moyenne de 263 $ pour ce travail

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7.2
RegulViktor

Hello. I'm an electrical engineer. You may check my qualification in the profile. Your project interesting for me. I think it's hard to reach your accuracy - but want to do it. We can discuss any details in the chat. W Plus

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shahbaz1980

Hello, good morning. I am heading a startup, we will deliver you complete schematics, BOM and pcb layout (if required). Please feel free to contact us. Best Regards, Shahbaz.

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6.3
mocuZ

Dear Valued Employer, My name is Martin Botsov and I am an engineering physicist with extensive experience in the field of circuit design, circuit prototyping and PCB design. As I understand from the project des Plus

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adipdutt

What is the bi-polar supply you are using for PGA ins amplifier ? Is there galvanic isolation or need from your DC and AC inputs? For AC a true RMS converter is required Both case overload clamping as used in Fl Plus

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darozat

A proposal has not yet been provided

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jitendrabaraiya

I can do your job.

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Dextersmind2

Hi, I can certainly do your work, i have more than 8 years of experience in this, kindly do reply me to discuss the project details with me. Will wait for your reply! Thanks

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slavaza

Determine the limitations of Accuracy, Input impedances and Frequency range for the analogue circuits, please. And write more detailed requirements.

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dariocortese

I'm an italian engineer specialized in high precision measure and generation for low frequency (50..500Hz) instrumentation and test equipment. In your description there are many information lack that must be covered be Plus

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