3 ms·
Precision and accuracy is very expensive there is a reason why high end measurement equipment costs as much as it does.
by dogma1138 1y ago
Precision and accuracy is very expensive there is a reason why high end measurement equipment costs as much as it does.
- kragen 1y agoAt some level it becomes expensive, but it's far from clear that five significant figures of mass is that level. A US$2 quartz watch measures time to 5½ significant figures, US$10 multimeters routinely measure voltage to 4½, and US$5 GPS receivers can provide you with time measurements accurate to 40ns that inherit the drift of world metrology standards, a precision of 16 significant figures if you are measuring a long enough time interval (over 10 years).
- userbinator 1y agoWhere are you finding $10 4.5 digit multimeters?
- kragen 1y agoHardware store, usually. 3.5 digits is common, 4.5 digits less so.
- userbinator 1y ago3.5 digit ones sell for far less than that (especially the infamous 830-series based on the ICL7106 and its clones). I haven't found any 4.5 digit ones at that price.
- kragen 1y agoI might be misremembering. How much have you found 4½ digit multimeters to cost?
- userbinator 1y agoAround $30 at the very, very least.
- thirdhaf 1y agoAs a quick and dirty rule of thumb measuring parts per million in anything except time or frequency will get expensive. Temperature drifts will cause expansions and contractions on that order if you’re measuring lengths.
- kragen 1y agoYes, but in this case we're measuring weights, not lengths, and we're looking for 5 sig figs, not 6.