steve.lindberg Posted July 22, 2022 Share Posted July 22, 2022 Trying to measure thermistor with no luck. Link to comment Share on other sites More sharing options...
0 Fausto Posted July 22, 2022 Share Posted July 22, 2022 Hello @steve.lindberg. Which software are you using and how are you connecting the thermistor? Take a look at the following KB articles and respond back with additional details and screen captures. https://kb.mccdaq.com/KnowledgebaseArticle50800.aspx https://kb.mccdaq.com/KnowledgebaseArticle50806.aspx Regards, Fausto Link to comment Share on other sites More sharing options...
0 steve.lindberg Posted July 25, 2022 Author Share Posted July 25, 2022 I am using Instacal. to simulate a thermistor I a using Fluke 5520A calibrator. I set Fluke to needed resistance and connect to USB-TEMP. Readings are off scale. Link to comment Share on other sites More sharing options...
0 steve.lindberg Posted July 25, 2022 Author Share Posted July 25, 2022 Link to comment Share on other sites More sharing options...
0 Fausto Posted July 25, 2022 Share Posted July 25, 2022 Have you successfully used your Fluke 5520A calibrator with the USB-TEMP, in the past? Please reference MCC's Knowledgebase articles. https://kb.mccdaq.com/KnowledgebaseArticle50326.aspx https://kb.mccdaq.com/KnowledgebaseArticle50799.aspx Do you have Steinhart-Hart Coefficients to enter into InstaCal? Do you have a thermistor to test with the USB-TEMP? Link to comment Share on other sites More sharing options...
0 steve.lindberg Posted July 27, 2022 Author Share Posted July 27, 2022 I am new to Transcat. We have no real thermistor that I am aware of. I do not know much about Steinhart-Hart coefficients but i assume they describe a particular thermistor's nonlinearity. A discrete resistance point should work. I used a pure resistance decade box also no reading. The knowledge base articles are useful and indicate I likely need the Steinhart-Hart vaues which of course I do not know for Fluke calibrator. Also, the fluke uses magic in that the resistance is simulated by analog circuits. I will talk to team here for tips. Thanks for help. Link to comment Share on other sites More sharing options...
0 Jeffrey Posted July 28, 2022 Share Posted July 28, 2022 Hi Steve, During your InstaCal set up where you select thermistor as the sensor type, there is a 'Help' button under the three boxes where you would enter the values. When you click it, it provides you with a description of where you should get your Steinhart-Hart coefficients, and also a set of defaults you can use to get going: To be clear, they are not coefficients to use with a real thermistor, but they can get you past the learning curve. I recommend you give them a try. Link to comment Share on other sites More sharing options...
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steve.lindberg
Trying to measure thermistor with no luck.
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