voltage meter design

Oct 11, 2005 5 Replies
D

We need help for design the analog front-end for a voltage and current measurement. If you are interested in this contract job please contact me at: DigitalSignal999[at]yahoo.com



For voltage, the device will have 4 channels: 4 (A, B, C, N) Connector type Safety Banana Max. input voltage 1000 Vrms Max peak voltage 6 kV Ground connection Safety Banana


For Current input: Number of inputs 4 (A, B, C, N)



Accuracy is about 0.2%. Bandwidth is 20kHz. All channels will be simultaneously sampled with A/D converters.



Vote
Twitter Facebook LinkedIn
W

Yawn.

?? Same voltage range as above (6kV)? Or at ground? ??

DC to 20kHz? Yawn.

Thanks, - Win
Vote
Twitter Facebook LinkedIn
D

Win,

To clarify, the 6kV is the maximum peak voltage for ESD testing. It is not in the measurement range. The actual measurement range will be below 1000Vrms.

Basically, we want to design the front-end like a Fluke meter.

Vote
Twitter Facebook LinkedIn
W

Right. Good advice.

W>>

Anyway, meanwhile, if the current measurements are floating to 1kV and with over-voltage to 6kV, that'd be interesting. :>)

Thanks, - Win
Vote
Twitter Facebook LinkedIn
J

--- Why even bother responding to him?

He helped write a book, you know, so he's so above it all and so blasé that he has to pooh-pooh your request for help with a yawn.

F*ck him. Want some _real_ help? Email me with what the current range needs to be, the accuracy and update rates you need for the voltage and current measurements, and what kind of money you're willing to spend to get there, and I'll be happy to start a dialogue with you.

-- John Fields Professional Circuit Designer

Vote
Twitter Facebook LinkedIn
S

Yes, then you get into some rather interesting CMRR scenarios. Nothing that can't be dealt with, but...

Best regards, Spehro Pefhany

"it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required