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General Misc => Misc => Topic started by: JMLStamp2p on March 02, 2011, 09:50:44 AM

Title: Analog to Digital Signal question.
Post by: JMLStamp2p on March 02, 2011, 09:50:44 AM

Good morning, I am new to the Axon and interested in it's Analog to Digital capabilitys. We use various instruments that output 1-10V DC, can the axon take this? I am using a 6VDC Battery array (2000 ma.) for power. Or does the analog signal in have to be between 1-5V DC, within battery voltage?

Thanks for the help,
JMLStamp2p

Title: Re: Analog to Digital Signal question.
Post by: Soeren on March 02, 2011, 01:56:27 PM

Hi,

Quote from: JMLStamp2p on March 02, 2011, 09:50:44 AM

We use various instruments that output 1-10V DC, can the axon take this?

It has to be 0 to 5V (guess that's what you meant), but a resistive 1:1 voltage divider should do fine.
What's the output impedance of your circuits?

Title: Re: Analog to Digital Signal question.
Post by: JMLStamp2p on March 03, 2011, 07:04:44 AM

Thank you for your Reply, thats what I thought. I'm not sure of the Impedance, it is just a 1-5VDC to 4-20ma converter module.
John Logan.

Title: Re: Analog to Digital Signal question.
Post by: Soeren on March 03, 2011, 05:23:23 PM

Hi,

Quote from: JMLStamp2p on March 03, 2011, 07:04:44 AM

I'm not sure of the Impedance, it is just a 1-5VDC to 4-20ma converter module.

Do you wanna replace the 1-5V to 4-20mA module?

If not, and if you got long leads, the 4-20mA is the better way to go, as the low impedance will be much less prone to noise pick-up.
At the receiving end, a resistor is all that's needed and it can be scaled to whatever max. voltage you need (5V here), as long as the driver can supply it.
An op-amp can make a 4-20mA (or 1-5V, or 1-10V) into 0-5V, if you need the full resolution of the D/A-C.

In your first post you said 1V-10V now you say 1V-5V?