We need calibrate some weights master 1 Lb. to 2,500 Lbs Where recomend to make the calibration I live in Chihuahua Mex. near to border with U.S we need a Cal. Lab. can you help us
The potential does exist for an effect on the measurements.....in fact the potential exists for significant effect.
There are several pieces to this puzzle. The first is how the weights and scales are calibrated. If the items are calibrated at 20 C and 50% RH, then the calibration is certainty affected in your current ambient conditions.
Hopefully the scale manufacturers can provide more precise guidence regarding the quantification of the effects. And you're right, scales vary, so you may need to talk to each manufacturer.
The weights are another piece. Typically the weights are calibrated at 20 C and 50% RH or lower. With the weights, you now have two issues. First, the thermal coefficient of the weight material will provide the base for calculating a realistic amount of change. Second, depending on the weight material, you may have serious risk for corrosion. The risk for corrosion applies to the scales also.
The next piece of this is to identify your other sources of uncertainty and quantify them. This will help you correct for the influences, negate them if possible, or eliminate them from consideration as a significant contributor of measurement uncertainty.
I presume from the description that you have little or no control over the environmental conditions, so compensation then is the step to take.
If your calibration provider can calculate some of this for you, then let them help. After all, they have to calibrate your equipment so they should have the opportunity to help you make good measurements. Hopefully they are accredited to ISO/IEC 17025.
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hershal 9/11/2002
John,
The potential does exist for an effect on the measurements.....in fact the potential exists for significant effect.
There are several pieces to this puzzle. The first is how the weights and scales are calibrated. If the items are calibrated at 20 C and 50% RH, then the calibration is certainty affected in your current ambient conditions.
Hopefully the scale manufacturers can provide more precise guidence regarding the quantification of the effects. And you're right, scales vary, so you may need to talk to each manufacturer.
The weights are another piece. Typically the weights are calibrated at 20 C and 50% RH or lower. With the weights, you now have two issues. First, the thermal coefficient of the weight material will provide the base for calculating a realistic amount of change. Second, depending on the weight material, you may have serious risk for corrosion. The risk for corrosion applies to the scales also.
The next piece of this is to identify your other sources of uncertainty and quantify them. This will help you correct for the influences, negate them if possible, or eliminate them from consideration as a significant contributor of measurement uncertainty.
I presume from the description that you have little or no control over the environmental conditions, so compensation then is the step to take.
If your calibration provider can calculate some of this for you, then let them help. After all, they have to calibrate your equipment so they should have the opportunity to help you make good measurements. Hopefully they are accredited to ISO/IEC 17025.
Hopes this helps.
Hershal