In trying to decided on a blog topic, I thought of the spreadsheet we did in our Applying Motor Controls and Drives class last week for showing the voltage and hertz relationship. We then used the chart wizard and selected a scatter point type of chart. I then started thinking about the calibration sheet we do in our other classes and thought it would be fun to see if I could put in the formulas to calculate error and automatically plot them on a chart. The workbook that I designed has a sheet for 4-20 mA,1-5 Vdc, and 3-15 psi output results. Now you just have to put in your URV and LRV to get your test points,enter your as founds, and errors will be automatically calculated. Also if you put in the desired maximum error, it will tell you whether test passed or failed. To get a nice looking report, complete other information in cells and print.
The link to the file is here:
The download works and opens in Excel 2007 or higher. One of the formulas I used for finding the difference between two numbers expressed as a percent is as follows: =100-(MIN(D2,C2)/MAX(D2,C2))*100.
I believe with a little more work and some feedback from automation professionals, this w ill be a great tool for both technicians and engineers. What kind of features would you add? Please feel free to express your opinions or ideas for what can be improved!
Mark Weisner, Technical Specialist at ISA, firstname.lastname@example.org