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]
2x channels ready for ADC (my ADC is 16bit with a PGA on the front.)
The ADC is two x differential channels +/-6vdc each.
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.
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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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Determine the limitations of Accuracy, Input impedances and Frequency range for the analogue circuits, please. And write more detailed requirements.
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