I connected some ATS2000A temperature sensors to the ADIO-100 analog inputs to monitor temperatures in several locations. But, the sensors were not reading correctly, about 10% low. After troubleshooting, I found that the ADIO is loading the sensor. The ADIO analog inputs use a resistor divider with two 560 ohm resistors, which presents a load of 1120 ohms to ground on each input.
Question: was it designed to use such a low resistance, or is mine built wrong.
Some analog devices (such as a self-powered current sensor that I wanted to use) require a minimum load resistance of 1M ohm. They will not work with the ADIO-100 at all.
I would think that a voltage divider using two 560 kohm resistors (rather than 560 ohm) would be a much better design because it would present >1M ohm load to the analog source.
For my purposes, I would actually prefer to have no divider (straight 5v inputs) so that I could have full 10 bit accuracy on my 5volt analog devices. If I want to measure something greater than 5 volts I can add an external voltage divider.
Would appreciate some input from the HS designers (or anyone else) as to whether it was designed for 560 ohm divider, or if mine has an assembly fault.
Thanks!
Question: was it designed to use such a low resistance, or is mine built wrong.
Some analog devices (such as a self-powered current sensor that I wanted to use) require a minimum load resistance of 1M ohm. They will not work with the ADIO-100 at all.
I would think that a voltage divider using two 560 kohm resistors (rather than 560 ohm) would be a much better design because it would present >1M ohm load to the analog source.
For my purposes, I would actually prefer to have no divider (straight 5v inputs) so that I could have full 10 bit accuracy on my 5volt analog devices. If I want to measure something greater than 5 volts I can add an external voltage divider.
Would appreciate some input from the HS designers (or anyone else) as to whether it was designed for 560 ohm divider, or if mine has an assembly fault.
Thanks!
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