I'm trying to get an AH175 hall-effect switching with for my anemometer project with no joy to date. Digging around in the datasheet I see specific gauss ranges for Bop(operating point) and Brp(release point). I have no way of measuring those but I'm wondering if the 1/4" by 1/2" long neo cylinder I JB Welded it to is overwhelming it with way too much flux ..... because it sure seems to be stuck in the "on" state!
Running on 12V. Got a 1.2K pullup on the OUT pin with a clipping diode to Gnd. I should see .7v from the diode in the "off" state but all I ever see with my DMM is <.2v. I believe it's sinking it's 10 mA from the pullup and staying that way.
Realizing a DMM is not ideal I've got WinScope on my PC but that's not helping much either. As soon as I plug the power supply in the thing goes full scale with 60 cycle noise! What's with that? No volts/div so I can't quantify it, but turning the gain down to almost nothing seems to get it under control.
It's probably safe to say there's a chance that it is in fact switching and I'm not using the WinScope good enough to see it, but right now I'm leaning towards a weaker magnet.
Any and all opinions and/or advice is as always ......
SP
Running on 12V. Got a 1.2K pullup on the OUT pin with a clipping diode to Gnd. I should see .7v from the diode in the "off" state but all I ever see with my DMM is <.2v. I believe it's sinking it's 10 mA from the pullup and staying that way.
Realizing a DMM is not ideal I've got WinScope on my PC but that's not helping much either. As soon as I plug the power supply in the thing goes full scale with 60 cycle noise! What's with that? No volts/div so I can't quantify it, but turning the gain down to almost nothing seems to get it under control.
It's probably safe to say there's a chance that it is in fact switching and I'm not using the WinScope good enough to see it, but right now I'm leaning towards a weaker magnet.
Any and all opinions and/or advice is as always ......
SP