AutoTrickler V4/AnD Scale Question

[jpjulian]

When, if ever, do you calibrate the FX-120i scale using the included 100 gram weight included with the AutoTrickler system? I pushed the wrong button at the wrong time, got an error code, and had to disconnect the AT and recalibrate, but that was my error. But unless I am missing something in the manual I don't see where the calibration weight comes into use. TIA

 

[RegionRat]

Place you scale in “grams” mode.

Place the check weight on the scale and if the scale reads within +/- a milligram then you really don’t need to run the calibration.

ETA: If you convert your check weight value to grains, you can occasionally place it on the scale to see if your gain calibration holds. Monitor the temperature in the room to see if the temp is stable. You are usually not going to get much drift in the calibration if the scale has been on and warmed up for a few minutes and then as long as the room temp doesn’t go wild it should keep stable.

 

[DeltaBravo]

I use a dime that weighs 35.02 grains, once before starting, once during use, and once at the end. I've only calibrated my scale a couple times in the years I've owned it and the 35.02 is always the same. HTH

 

[RegionRat]

BTW, see pp 13 of the manual. Adam says you really don’t need to recalibrate as much as we think. His recommendation is not to bother unless the 100 gram check weight is off by 20 milligrams or more. Not to differ with his advice, but I don’t find it difficult to stay within 1 milligram on a 100 gram check weight.

 

[Rocketvapor]

Full Scale calibration sets the slope of the entire range from zero to full scale.
A 20mg error @ 100 grams is 0.02% and will be a mostly constant percentage error across the range.
At a test/charge weight of something like 5 grams or less, error due to calibration would be one display count on a scale with milligram resolution.
Linearity at or near test/charge weight might be a count, or two and can only be determined with a smaller check weight.

 

[jpjulian]

Full Scale calibration sets the slope of the entire range from zero to full scale.
A 20mg error @ 100 grams is 0.02% and will be a mostly constant percentage error across the range.
At a test/charge weight of something like 5 grams or less, error due to calibration would be one display count on a scale with milligram resolution.
Linearity at or near test/charge weight might be a count, or two and can only be determined with a smaller check weight.

Huh?????? If I start to think like this my brain is going to bleed...