rcbs rangemaster 750

sweatybetty

New member
i was having a little trouble with "creeping", readout inching up with nothing in the pan. i called rcbs, and they emailed this to me. it works, no more creep.

During the use of electronic scales over the course of a day, you may notice your RangeMaster scale's readings begin drifting or not returning to zero. This can be caused by changes in environmental conditions, especially temperature, and also residual stresses in the load cell from manufacturing. First, verify that your unit has had sufficient time to warm-up (at least 20 minutes). If you have been using your scale for more than an hour and noticed this behavior, try re-calibrating your scale, especially if you are outdoors or in an uncontrolled environment (garage, shop, etc. without air conditioning). Otherwise, your load cell may need to be stress-relieved to eliminate these symptoms. Normal use of the scale over time will break-in the load cell and cause these symptoms to stop, but could take hours of use. Follow these steps to safely accelerate this 'break-in' period of the device and eliminate this problem:

Accelerated Break-In Procedure:
1. Remove weights and pan from platen
2. Press 'ZERO' button
3. With your finger, tap the platen softly enough to barely cause the scale to overload (you will get an "OL" reading). The amount of force required will be comparable to how hard you push on a computer keyboard when typing.
**Note** the scale is equipped with a mechanical stop on the load cell to prevent it from being over-stressed. However, applying excessive force could still damage it. Do not hit your scale with more than 8 ounces (250 grams) of force.
4. Repeat this tapping 20-30 times.
5. Allow your scale to stabilize. If you have a non-zero reading, your scale did have residual stress in the load cell and should function better now.
6. Recalibrate the scale and resume normal operation.
7. If over time, you notice this behavior recurring, repeat these steps again as necessary.
 
Yep i had the same problem with mine. They sent me the same info and it works good. I still have to tap it once inawhile the re cal but i love the scale for double checking loads. I wish it displayed hundredths as well though.
 
Last edited:
Hey Sweaty,
Info only. I have two 750 Rangemaster scales and what I discovered to eliminate the creeping was to use a surge protector that also keep a constant and even flow of electrical current to it, sort of like one used on computers. The other trick I found is not to have a ceiling fan or any other fan that creates airwaves across any part of the scale when using it. The other is direct light or direct overhead lamps that have balasts that put out electrical waves the scale picks up. I get virtually no drift ALL all and mine work just fine without a 20 minute warm up and hardly ever have to press zero. I just follow the written instructions and rarely have any problem which is usually the result of electrical interference (radio waves).
 


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