{"id":390,"date":"2012-02-06T20:55:24","date_gmt":"2012-02-07T03:55:24","guid":{"rendered":"https:\/\/inkofpark.wordpress.com\/?p=390"},"modified":"2024-09-01T20:20:45","modified_gmt":"2024-09-02T02:20:45","slug":"rimu-calibration","status":"publish","type":"post","link":"https:\/\/www.inkofpark.com\/?p=390","title":{"rendered":"RIMU Calibration"},"content":{"rendered":"<p>I turned the freezer up to 7. I\u2019m sure yours goes to 11, but I am not so lucky. After being turned up to 7, the resulting mean temperature is still too high at 18.8\u00b0F. And with that, we bid adieu to our refrigerator. It is around 20 years old\u2014no way to be sure, and it has had a good life. I suppose the EPA would frown on a Viking funeral?<\/p>\n<p><a href=\"http:\/\/www.inkofpark.com\/wp-content\/uploads\/2012\/02\/freezer_only.png\"><img loading=\"lazy\" decoding=\"async\" style=\"background-image:none;padding-left:0;padding-right:0;display:inline;padding-top:0;border-width:0;margin:5px;\" title=\"freezer_only\" alt=\"freezer_only\" src=\"http:\/\/www.inkofpark.com\/wp-content\/uploads\/2012\/02\/freezer_only_thumb.png\" width=\"644\" height=\"399\" border=\"0\" \/><\/a><\/p>\n<p>As a final check, I tested the thermometer by running it from a stirred ice bath up to a rolling boil. The ice bath temperature, averaged over about 1 minute, is about 33.1\u00b0F. A 1\u00b0F error does not present any problems.<\/p>\n<p><a href=\"http:\/\/www.inkofpark.com\/wp-content\/uploads\/2012\/02\/freezer_only_annotated2.png\"><img loading=\"lazy\" decoding=\"async\" style=\"background-image:none;padding-left:0;padding-right:0;display:inline;padding-top:0;margin:5px;border:0;\" title=\"freezer_only_annotated\" alt=\"freezer_only_annotated\" src=\"http:\/\/www.inkofpark.com\/wp-content\/uploads\/2012\/02\/freezer_only_annotated_thumb2.png\" width=\"644\" height=\"399\" border=\"0\" \/><\/a><\/p>\n<p>Calibration in an ice bath is quite easy, but calibration at boiling is not. The pressure estimated from the RIMU predicts a temperature below the measurement, while the local airport\u2019s barometric pressure predicts one above. In any case, the error is a few percent or less.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I turned the freezer up to 7. I\u2019m sure yours goes to 11, but I am not so lucky. After being turned up to 7, the resulting mean temperature is still too high at 18.8\u00b0F. And with that, we bid adieu to our refrigerator. It is around 20 years old\u2014no way to be sure, and [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[17,25],"class_list":["post-390","post","type-post","status-publish","format-standard","hentry","category-making","tag-arduino","tag-electronics"],"_links":{"self":[{"href":"https:\/\/www.inkofpark.com\/index.php?rest_route=\/wp\/v2\/posts\/390","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.inkofpark.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.inkofpark.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.inkofpark.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.inkofpark.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=390"}],"version-history":[{"count":1,"href":"https:\/\/www.inkofpark.com\/index.php?rest_route=\/wp\/v2\/posts\/390\/revisions"}],"predecessor-version":[{"id":1285,"href":"https:\/\/www.inkofpark.com\/index.php?rest_route=\/wp\/v2\/posts\/390\/revisions\/1285"}],"wp:attachment":[{"href":"https:\/\/www.inkofpark.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=390"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.inkofpark.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=390"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.inkofpark.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=390"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}