tag:blogger.com,1999:blog-2333275525623588663.post2031812116617135477..comments2016-07-11T04:43:03.373-07:00Comments on Hands On - Make: More Electronics: Experiment 10 (Chapter 10) -- Let There Be LightJames Floyd Kelly (Jim)http://www.blogger.com/profile/13876934942928389738noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-2333275525623588663.post-82970717756407725682014-08-11T06:23:51.119-07:002014-08-11T06:23:51.119-07:00Hi, Luke.
Sorry for delay -- took last week off. ...Hi, Luke.<br /><br />Sorry for delay -- took last week off. My only guess is that liquids just aren't consistent enough in their mixture to be easily measured. If it's measuring resistors properly, that's probably a good thing. You might want to test its reads on voltage (that you know) as well as known current... just to verify that your meter is working properly. i wouldn't worry about liquids right now.James Floyd Kelly (Jim)https://www.blogger.com/profile/13876934942928389738noreply@blogger.comtag:blogger.com,1999:blog-2333275525623588663.post-89952433665712172262014-08-06T11:24:50.097-07:002014-08-06T11:24:50.097-07:00Hi Jim,
Thanks for your reply! I tried measuring...Hi Jim, <br /><br />Thanks for your reply! I tried measuring a 100k resistor, and it seemed to measure it perfectly whichever setting it was on! Bizarre! Ive just completed the first experiment, and in measuring a glass of water, the results seemed to differ again! It seems to be struggling with liquids!! I think this is the only experiment where Ill be measuring the resistance of liquids, so i think ill stick with my current meter, but keep an eye on the results Im getting in the coming experiments....if they are fishy, and don't make sense, Ill invest in a new meter! What do you reckon? <br /><br />Lukeginger lukehttps://www.blogger.com/profile/08459504485327700011noreply@blogger.comtag:blogger.com,1999:blog-2333275525623588663.post-79279509429831737732014-07-27T12:30:36.532-07:002014-07-27T12:30:36.532-07:00Hi, Ginger.
Glad you like the blog. I've got ...Hi, Ginger.<br /><br />Glad you like the blog. I've got a LOT to do in this coming week with Experiment 11... it's a big chapter. <br /><br />I'm no expert on meters, but I imagine your tongue's resistance is difficult to measure given that the human body made up of water. You're dealing with saliva... so one reading your tongue might not be as dry (or wet) as the next reading. You'd think the meter would give an identical reading, but I don't think you can expect that when measuring the resistance of your tongue. To test your meter, be sure to use the pincer/grabber ends so you're not touching a resistor with your fingers. Take a reading with the 200k and let's say you get 85k. Switch to 2000k and yeah, you should get the same 85k. If not, you might have a faulty meter, but I've got a cheap-o meter that I've used for years and it seems to get the same results as my more expensive one. Let me know what kinds of values you get when reading a resistor. James Floyd Kelly (Jim)https://www.blogger.com/profile/13876934942928389738noreply@blogger.comtag:blogger.com,1999:blog-2333275525623588663.post-8106941270190903102014-07-27T11:58:50.056-07:002014-07-27T11:58:50.056-07:00Hi Jim,
Hope you're well! Thanks again for th...Hi Jim, <br />Hope you're well! Thanks again for the posts - this blog is great, and its exciting to see the kind of projects I could be doing when I complete the original Make:Electronics book!<br />If you have some time, I'd appreciate your thoughts on this...<br />Ive literally just started the original book, and I'm using a really cheap meter that i bought several years ago. Its manual ranging, and I was using it for the first experiment, checking the resistance of my tongue. With the setting at 200K, the value on the meter was 85....which I assume to be 85 kilohms. When I did the same measurement with the meter on a setting of 2000K, the display read 350?! Does this indicate a faulty meter? Shouldn't they read the same value? <br />Thanks so much for your help! Keep the blog posts up, I really enjoy reading them! Luke ginger lukehttps://www.blogger.com/profile/08459504485327700011noreply@blogger.com