Hi Hippie Dickie,
Hippie Dickie said:
Egzoset said:
There are at least two important qualities relative to temperature in a vaporizer:
1) Regulation stability, expressed in relative terms
2) Accuracy of measurement, expressed in absolute values
...i don't understand why you say regulation stability is a relative measure.
1st lets explain with an example what it means to express accuracy of measurement in absolute values.
Sn 95.6/Ag 3.5/Cu 0.9 solder is truly eutectic at 217 C, this means that as long as your thermometer can measure temperature accurately this particular solder alloy will always melt at the same temperature: the results are
independant of your measuring device, the 217 C point is an "absolute" value.
Of course, you can try to cheat by modifying the environment (mainly by changing pressure and atmosphere composition) but then you'd be avoiding the idea...
The thing here is that you can't use absolute values to express regulation stability unless the settling temperature itself can be measured accurately and, even if you're able to state that you can, then this would only render information exchanges most inconvenient outside of your work room anyway. It's quite possible to monitor variations with excellent accuracy, on the other hand. Those variations usually express in practical "relative" terms: for example, on the "percent" range - which IS a relative scale. It's not really important where 350 F really occurs on my HerbalAire dial, i just need the temperature to remain as close as possible to my favourite sweet spot once i've found it. What about you?
Now, that leads us to the digital display... Knowing that the number being shown probably isn't accurate in absolute terms, wouldn't it make much more sense to add one dimension to this display by drawing real-time
curves anyway, possibly with digital deviation readings expressed in percent instead?...
Well, maybe it's too late for the v3 HerbalAire but why not in v4!
In fact, i'd rather simplify the display and drop numbers in favour of a USB port, euh... But i can sense objections coming already! Unfortunately, we don't know what's inside the HerbalAire and hence it's not possible to establish how analog and digital technologies were combined in its design. My bet is there may happen to be more digital content to it than meets the eye even in a v2.1 release.