Signal conditioning AC 80Vrms

[tjalps]

circuity iso124

Hello!

Does anyone have any good solution for signal conditioning upper signal to standard NI equipment levels ( - 10V >< + 10 V ) and other. Any solution is welcome.

Best regards!

 

[marie65]

iso124 schematic

One solution is to use an isolation amplifier. I usually use the low cost ISO124P from Burr Brown (now TI). In front of the ISO124, you can built a voltage divider that will reduce the voltage at the required level for NI board. The ground loop is interrupted by the ISO so you don't have to worry about voltage differences between the NI board and the signal source.

 

[sdhawan]

Can you please give me the schematics of this

 

[nicleo]

Can you please give me the schematics of this

You can find some circuit schematic in ISO124 datasheet:
http://focus.ti.com/lit/ds/symlink/iso124.pdf

 

[IanP]

If it is AC voltage (low frequency) you can use low-power transformer and step this voltage down to NI levels: it is cheap and safe.