Inexpensive Noise Filter Helps Reduce Scale Drift Problems
Electronic scales, even expensive lab-grade units, can be influenced by a wide variety of electronic “emissions”. We’ve seen Chargemasters being affected by cordless telephones and older CRT computer monitors. When stray emissions interfere with digital scales, you can get erractic readings, or the scales can drift with time. The smart thing to do, of course, is to physically isolate your digital scale from the sources of interference — keep them away from computer equipment and wireless base units. If you still have problems with drift or unstable read-outs, thankfully there are some inexpensive accessories that can restore your scale’s reliability. Reader Scott G. found a ferrous (magnetic) filter that attaches to the cord of his digital scale. This inexpensive filter cured his scale’s tendency to drift.
Scott explains: “I had an issue with a drifting zero on my PACT, which made it unusable. It was happening at my house, but not at other locations, such as my office. The fix for my issue was a ferrous noise filter on the scale’s power supply cord. It is basically a hinged barrel-shaped plastic tube that contains two magnets. Near the scale end of the cord, lay the cord into the slot, wrap it back through, then close the filter around the cord. Before installing the ferrous filters, my scale would drift off as much as 2.9 grains, which was being caused by some type of electronic ‘noise’ in the environment. The PACT is absolutely stable now.”
Finding and Installing Magnetic Noise Filters
Scott tells us: “You’ll see a lot of these type filters on the cords for computer acessories. You may have to experiment to find one that works for you. Some have different magnets that have different filtering abilities. My filter cost about $3.00. I purchased it at Randolph and Rice Industrial Electronics in Nashville, TN, item #SF.065.” You should also be able to find these kind of filters at Fry’s, Radio Shack, or other electronics supply stores.
While some magnetic filters require the power cord to run straight through, other designs allow you to loop the cord once around the filter (see photos). Looping the cord actually enhances the performance of the filter. You can also get improved filtration of electronic interference by putting a magnetic ‘noise’ filter on BOTH ends of your scale’s power cord.
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Tags: Digital Scale, Ferrous, Magnet, Noise filter
Heck of a lot cheaper than a conditioned power supply.
A basic Isolation transformer is all you normally need for power noise problems. I bought 2 for $25 each. although this is a cheaper option.
We shall see. A friend has the same brand scale that he retired to the shelf three years ago, if favor of his old balance scale. I am going to borrow it and see if it can be made to work better. I’ll report back what happens. Good tip, as well as the previous comment.
I have had the same scale for many years and have only used sparingly due to the same issue. After picking up one of these noise filter at Fry’s for less than $3 and installing it the scale now works perfectly in areas of the house where it previously would not function at all. The first indication I had that there was something to this tip was how fast the scale was able to be calibrated which had always been a problem in the past.
Excellent tip, thanks!