I'm no expert, but the schematic is at
http://www.hobby-boards.com/catalog/links/hvac2-r1/HVAC%20Monitor%20v2.0%20Schematic.pdf
With 1M resitor and 1uF capacitor, the time constant is 1 second. What is the frequency of your AC? 60Hz?
Paul Alfille
On 6/7/06, Jim Duda <[EMAIL PROTECTED]> wrote:
I apologize if this is off topic, since owfs seems to handle DS2450 just
fine, as best I can surmise.
I purchased a "HVAC Monitor Kit" from Hobby Boards. The description of
the board states that it can measure any voltage up to 28V AC or DC.
The design has a diode and a resistive voltage divider (100K/1M) on the
front-end of the DS2450 voltage inputs.
For the signal I want to monitor, my DVM measures 15V AC at the terminal
lug of the HVAC Monitor. However, via owfs HTTP, I see various voltages
between 240 mV and 1.5V, seems to be all over the place, like maybe a
sinusoid :-)
Can anyone offer any tips on how I might measure an AC voltage with this
thing?
Jim
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