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Wernra 21/11/2021
I ordered two calipers and an air quality meter on 12.11.21, the three items arrived 7 days later. Here is the review of the calipers. The gauges are not good value, they are not worth anything. The slider has play compared to the fixed part of the caliper, not only does it move back and forth very easily, changing the reading, if you hold the calipers vertically upwards, the slider falls down by itself. The units are both very difficult to switch off, because when you put the units down, the slider moves and this automatically switches the units back on. This reduces the battery life. The jaws have casting burrs that can crush thin objects when measuring, or affect the result. If you press the two jaws together and hold them against the light, you can see an uneven gap of about 0.1 mm. What I don't think is made clear enough in the description is that the resolution is only 0.1 mm instead of 0.01 mm as is usually the case with digital calipers. I also did not expect the fixed part to be so flexible that it deforms even under slight force so that the display changes by +-0.2 mm. In order to be able to mount two clamping screws, I dismantled the units. There are four screw holes under the rear cover into which only three screws were screwed in both units, which also makes the units unstable. Also the mounting of the two additional clamping screws does not hinder the change of the display when the long part is bent. A digital caliper with an accuracy of about half a millimetre is not usable for me. Ich habe am 12.11.21 zwei Schieblehren und ein Luftqualitätsmessgerät bestellt, die drei Artikel kamen 7 Tage später bei mir an. Hier die Bewertung der Schieblehren. Die Messgeräte sind nicht preiswert, sie sind nichts wert. Der Läufer hat gegenüber dem festen Teil der Schieblehre Spiel, er lässt sich nicht nur sehr leicht hin und her bewegen, wobei sich die Anzeige verändert, wenn man die Schieblehren senkrecht nach oben hält, fällt der Läufer von selbst runter. Die Ger
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Wernra 21/11/2021
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Q: what is the minimum weight this cell can detect?

Soran domenicodelleside Açık 2018-03-08 08:41:37

Wernra If 1kg is the maximum acceptable weight and the solution of the AD-Converter is 24 bit, the least significant bit means about 1kg / 2^24 = 1000 g / 16777216 = 0,00006 g. Least significant bit does not say repeatable accuracy, it means only maximal solution. So the minimum weight should be about ten times the solution, is about 0,001 g (AD =Analog to digital). The sensor changes a mechanical analog tension in a analog voltage tension. The change in the analog voltage tension is small, so the solution of the AD-Conversion has to be high. At high solutions you always have scattering or spills, so it is good to measure often and calculate an arithmetic mean.

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