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April 16, 2013, 12:53 AM | #51 | ||
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Quote:
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April 16, 2013, 05:24 AM | #52 |
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I have read that fluorescent lights can affect a digital scale, how is that ?
I have been using a Franklin Arsenal digital scale for about a year and it has always been within .1 of a grain. I never notice any effect from the fluorescent lights in my basement where I reload. |
April 16, 2013, 06:49 AM | #53 |
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Then by all means get the Frankford Arsenal DS-750, however you can save the most by just using your balance beam.
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April 16, 2013, 07:36 AM | #54 | |
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Rebs
If you get close enough fluorescent lamps can affect most unshielded electronic scales through RFI (radio frequency interference) that is broadcast through the air from the lamp tubes, but most often it is scales that plug into a wall that are affected, and that's by EMI (electromagnetic interference) which often has lower frequency components than RFI, but that are higher frequency than 60 cycles and that is being carried by the power lines. Both are due to the fact fluorescent bulbs have a plasma arc inside that doesn't draw current in a completely smooth way, having small lurches and stalls (noise) that are superimposed on the current average. This noise is coupled capacitively between the ballast windings into the power lines, and can travel some distance down them before dissipating. In your scale this noise contaminates with weight sensor signal. Motors with brushes make even stronger EMI than fluorescent lamps do, but the cure is the same: you need an EMI filter. Most people use an old computer UPS (uninterruptable power supply) with a dead battery. Plug it into the wall and the scale into the UPS. These have a filter built in. Quote:
What the baffles do is handle that task automatically. They do this by holding back most of the powder column weight above them, and they limit vibration effect by making the powder move down and then sideways to get to the metering chamber, which breaks some of the packing up. Adding a baffle can cut variations in half pretty easily, and two of them in tandem is like adding another layer of filtering to the charge weight noise. Just keep them at right angles so both layers of powder under them have to flow sideways. Re, your scale. There is a fellow who tunes balance beam scales. Used to charge $20. Roughly triples the sensitivity and repeatability. Scott something. You can search him out on You Tube. But the main thing is to get one of those circular plastic bubble levels from Lowe's and get the thing leveled and on a steady, vibration-free surface. Keep static electricity and drafts away from it. If need bu, disassemble and clean and make sure no iron filings have got into the gap between the damping magnets and make sure the knife edge and the notches that set on it are clean and free of oil.
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April 16, 2013, 07:51 AM | #55 | |
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Similar (but reversed) effect. The "spill" from pulsed a/c current can introduce variatioins into the current generated by the load cell, faking out weight changes. Also as said electronic "noise" in the a/c line has a similar effect.
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April 16, 2013, 08:17 PM | #56 | |
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As far as the scale, I may just have to heed all advice given about the physical elements surrounding it and see if I get better results. I'll let you know how it turns out once I get my loading bench all set up. (Just moved and everything is still in boxes) Thanks again Uncle Nick |
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April 17, 2013, 01:45 PM | #57 |
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"What's a good, but cheap digital scale?"
IME, "good" and "cheap" are mutually exclusive terms. |
April 18, 2013, 02:07 AM | #58 |
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we've been down that road already, old buddy
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April 18, 2013, 10:54 AM | #59 | |
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Uncle Nick mentions a "tuned" scale by "Scott." Scott Parker is his name and he prefers phone calls, so he can explain which scales he can work on. It seems that there was a 10-10 scale produced in Mexico for a time that was untunable. He wants to make sure you don't send him one of those....look on your box. I think the price now is $65, but that includes shipping....he also sells 10-10's already tuned.
Quote from Scott: Quote:
Last edited by GWS; April 18, 2013 at 11:10 AM. |
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May 5, 2013, 06:34 PM | #60 |
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Join Date: December 20, 2011
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All electronic devices eventually fail
Never have I had an electronic device which didn't fail. They are not made to last forever. And they usually fail at the wrong time.
GET A 5-0-5 and forget about the new electronic age. |
May 6, 2013, 02:02 AM | #61 | |
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The electronic age is here, and here to stay. Until some nuclear fallout/world war happens, I'll be enjoying my new digital scale for reloading. |
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