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The Range
Ammo & Reloading
Anyone else have problems with electronic scales?
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<blockquote data-quote="alank2" data-source="post: 1618264" data-attributes="member: 108"><p>Hi,</p><p></p><p>My digital scale does better on battery power than wall power for some reason.</p><p></p><p>With a digital you have to understand how the underlying hardware works. It uses a load cell to determine weight. Load cells constantly wander up and down due to voltage fluctuations, temperature, etc. Most digital scales deal with this wandering by having a "zero mode". On my scale it shows a little "-0-" in the upper left of the display. This is the scale tell you that it considers the platen to be empty and if the load cell wanders up or down a little bit, it will keep updating itself to zero with whatever the load cell value is. Most digital scales for example can't read 0.1 grains. If you have tiny pieces of paper 1/4" x 1/4" that weight about 0.1 grains and put them on the scale while it is in zero mode, it will adjust to the new weight and still think it is on zero. Add 5 of these 1 at a time giving it time to adjust to the new zero and it will still be on zero at the end even though it has 0.5 grains on the platen. Remove them all at once and it will read -0.5 grains.</p><p></p><p>Adding a weight to be measured should be done quickly because once it determines a weight has been added, it keeps the last load cell value (before the weight was added) as zero. It then subtracts the new load cell value from the recorded "zero" one and determines your weight. As long as it is NOT on zero, it will possibly become more inaccurate. This is because the load cell will still wander except now that with something on the platen it is no longer autozeroing.</p><p></p><p>So, to deal with a digital scale you need to be aware of when it thinks it is and is not on zero. To get an accurate measurement:</p><p></p><p>Start with an empty platen, it should indicate zero.</p><p>Add your weight quickly, don't slowly pour powder into it for example.</p><p>Take the weight.</p><p>Remove the item and let it rezero again.</p><p></p><p>You can weight items in succession without going to zero, but periodically it is wise to let it be empty and zero, say every 5 or 10 items for example.</p><p></p><p>I greatly prefer digital scales because they give you the value quickly, but you always have to start with an empty platen and zero right before adding a weight and measuring...</p><p></p><p>Good luck,</p><p></p><p>Alan</p></blockquote><p></p>
[QUOTE="alank2, post: 1618264, member: 108"] Hi, My digital scale does better on battery power than wall power for some reason. With a digital you have to understand how the underlying hardware works. It uses a load cell to determine weight. Load cells constantly wander up and down due to voltage fluctuations, temperature, etc. Most digital scales deal with this wandering by having a "zero mode". On my scale it shows a little "-0-" in the upper left of the display. This is the scale tell you that it considers the platen to be empty and if the load cell wanders up or down a little bit, it will keep updating itself to zero with whatever the load cell value is. Most digital scales for example can't read 0.1 grains. If you have tiny pieces of paper 1/4" x 1/4" that weight about 0.1 grains and put them on the scale while it is in zero mode, it will adjust to the new weight and still think it is on zero. Add 5 of these 1 at a time giving it time to adjust to the new zero and it will still be on zero at the end even though it has 0.5 grains on the platen. Remove them all at once and it will read -0.5 grains. Adding a weight to be measured should be done quickly because once it determines a weight has been added, it keeps the last load cell value (before the weight was added) as zero. It then subtracts the new load cell value from the recorded "zero" one and determines your weight. As long as it is NOT on zero, it will possibly become more inaccurate. This is because the load cell will still wander except now that with something on the platen it is no longer autozeroing. So, to deal with a digital scale you need to be aware of when it thinks it is and is not on zero. To get an accurate measurement: Start with an empty platen, it should indicate zero. Add your weight quickly, don't slowly pour powder into it for example. Take the weight. Remove the item and let it rezero again. You can weight items in succession without going to zero, but periodically it is wise to let it be empty and zero, say every 5 or 10 items for example. I greatly prefer digital scales because they give you the value quickly, but you always have to start with an empty platen and zero right before adding a weight and measuring... Good luck, Alan [/QUOTE]
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