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  • 8/13/2019 Accuracy testing on four mechanical balances.pdf

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    11/25/13 Accuracy testing on four mechanical balances

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    [ AND WEIGHING] [ ADAM] [ HEALTH-O-METER] [ METTLER] [ MYWEIGH] [ OHAUS] [ SARTORIUS] [ SCIENTECH] [ SILTEC]

    Methodology and Standard Weights for Accuracy Testing on Four

    Mechanical Balances

    by David W. Davenport, January-February 2000

    Purpose: To determine how three mechanical "pocket scales"Accura, Calibrn, and Deering 10

    gramcompare in accuracy to the extremely accurate Mettler AE 100 analytical balance (Swiss,

    electronic). Also determine how the laboratory-quality Ohaus Dial-O-Gram 310Model mechanicalbench balance compares to the Mettler AE 100 analytical balance. Compare and contrast all four

    mechanical scales for accuracy, features, and ease of use.

    Method:A calibrated Mettler AE 100 analytical balance (accurate to 0.0002 grams = 0.2 mg) was

    used to acquire three replicateweights of objects used as mass standards. These standards

    consisted of Ohaus calibrationweights (from Model 218-16 set, 10 mg to 500 mg, ANSI/ASTM

    E617, 1991, Class 6; as well as an Ohaus 1.000 g mass), and common United States Mint coins

    (penny, nickel, dime, quarter). These objects provide a practical range of "standard weights" for

    determining the accuracyof three mechanical pocket scales (Accura, Calibrn, and Deering) with

    ranges of 0 to 4 grams, or 0 to 10 grams. In addition to the pocket scales, the Ohaus Dial-O-Gram

    310Model mechanical scale (a top-of-the line mechanical bench balance) was tested in its 0 to 10gram range (this scale measures up to 310 grams, with readability to 0.01 gram = 10 mg).

    Procedure:The Mettler AE 100 balance was leveled, then calibrated using an ANSI/ASTM E617

    Class 1 100 g, 0.00025 g mass at the start of the weighing project. (The Mettler balance was

    professionally serviced by a certified calibration technician, just four months ago.) The balance was

    taredprior to each replicate weighing of each "standard mass." The four mechanical balances were

    placed on a flat, non-skid surface, then the beams were leveled, and the "zero" checked prior to

    each replicate weighing. The weighings were conducted in a room with ventilation fans turned "off,"

    to eliminate "swinging" by the beams. Forceps were used to manipulate all Ohaus calibration

    masses, and latex gloved fingers to manipulate all coinsto insure the masses did not pick up any

    "extra weight" from handling. Statistics were used to find the mean, standard deviation, and

    http://www.scalenet.com/about.htmlhttp://www.scalenet.com/about.htmlhttp://www.scalenet.com/applications/glossary.html#tarehttp://scaleman.com/ohaus-31000-dialogram-balance.htmlhttp://www.scalenet.com/deering10.htmlhttp://www.scalenet.com/calibron.htmlhttp://www.scalenet.com/accura.htmlhttp://www.scalenet.com/applications/glossary.html#acchttp://www.scalenet.com/applications/glossary.html#acchttp://www.scalenet.com/cent.htmlhttp://www.scalenet.com/deering10.htmlhttp://www.scalenet.com/calibron.htmlhttp://www.scalenet.com/accura.htmlhttp://scaleman.com/siltec.htmlhttp://scaleman.com/scientech.htmlhttp://scaleman.com/sartorius.htmlhttp://scaleman.com/ohaus.htmlhttp://my-weigh.balances.com/http://www.lab-balances.com/mettler/mettler-toledo.htmlhttp://health-o-meter.balances.com/http://scaleman.com/adamlab.htmlhttp://scaleman.com/and.htmlhttp://www.scalenet.com/about.html

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    coefficient of variation (CV) for each set of three replicate weighings. The mean value of each

    standard, per the Mettler balance, was then used for comparison to the mean value of each

    standard, per each of the four evaluated balances (Accura, Calibrn, Deering 10 gram, and Ohaus

    310-00)see following spreadsheets.

    Note:In the spreadsheets and graphs on the following pdf files (Accura, Calibrn, Deering 10 gram,

    and Ohaus 310-00), the Mettler mean weight is the "independent variable" on the X-axis; while the

    mean weight of the mechanical balance under testing is the "dependent variable" on the Y-axis. A

    "perfect" value for the line shown on each graph is a linear equation (y = mx + b) of "y = 1.0000x +0.0000" and an R2value of "1.0000."

    Weighing Results for Sixteen "Standard Masses," per Mettler AE 100 Analytical Balance

    Object

    10 mg

    Ohaus

    Calibr.

    Mass

    20 mg

    Ohaus

    Calibr.

    Mass

    50 mg

    Ohaus

    Calibr.

    Mass

    100 mg

    Ohaus

    Calibr.

    Mass

    200 mg

    Ohaus

    Calibr.

    Mass

    500 mg

    Ohaus

    Calibr.

    Mass

    1,000 mg

    Ohaus

    Calibr.

    Mass

    1,000 &

    500 mg

    Ohaus

    Masses

    Weighing 1, g 0.0099 0.0200 0.0502 0.1003 0.2000 0.4998 1.0036 1.5032

    Weighing 2, g 0.0099 0.0201 0.0502 0.1003 0.2000 0.4998 1.0035 1.5033

    Weighing 3, g 0.0099 0.0200 0.0502 0.1002 0.2000 0.4997 1.0035 1.5033

    Statistics

    Mean of 3, g 0.0099 0.0200 0.0502 0.1003 0.2000 0.4998 1.0035 1.5033

    Standard

    Deviation0.0000 0.0001 0.0000 0.0001 0.0000 0.0001 0.0001 0.0001

    Coefficient of

    Variation

    (CV)

    0.00% 0.29% 0.00% 0.06% 0.00% 0.01% 0.01% 0.00%

    Weighing Results for Sixteen "Standard Masses," per Mettler AE 100 Analytical Balance

    Object

    Dime (US

    Mint,

    1992 D)

    Penny

    (US Mint,

    1990 D)

    Dime &

    1,000 mg

    Ohaus

    Mass

    Dime, 500 &

    1,000 mg

    Ohaus

    Masses

    Nickel

    (US Mint,

    1999 D)

    Quarter

    (US Mint,

    1995 D)

    Quarter &

    Dime

    Penny,

    Nickel &

    Dime

    Weighing 1, g 2.2634 2.5086 3.2670 3.7666 4.9947 5.7063 7.9698 9.7668

    Weighing 2, g 2.2633 2.5086 3.2671 3.7667 4.9947 5.7065 7.9698 9.7668

    Weighing 3, g 2.2634 2.5086 3.2670 3.7667 4.9947 5.7065 7.9699 9.7668

    Statistics

    Mean of 3, g 2.2634 2.5086 3.2670 3.7667 4.9947 5.7064 7.9698 9.7668

    Standard

    Deviation0.0001 0.0000 0.0001 0.0001 0.0000 0.0001 0.0001 0.0000

    Coefficient of

    Variation

    (CV)

    0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%

    http://www.scalenet.com/pdf/mechanical5.pdfhttp://www.scalenet.com/pdf/mechanical4.pdfhttp://www.scalenet.com/pdf/mechanical3.pdfhttp://www.scalenet.com/pdf/mechanical2.pdfhttp://www.adobe.com/prodindex/acrobat/readstep.htmlhttp://www.scalenet.com/pdf/mechanical5.pdfhttp://www.scalenet.com/pdf/mechanical4.pdfhttp://www.scalenet.com/pdf/mechanical3.pdfhttp://www.scalenet.com/pdf/mechanical2.pdf

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    Summary of Accuracy Determinations for Four Mechanical Balances

    Features Comparison for Four Mechanical Scales, and Recommendations

    Search for:

    Hot Buys| Analytical Balances| Baby Scales| Calibration W eights| Counting Scales| Com mercial Floor Scales| Crane Scales|Industrial Platform & Bench Scales| Mechanical Balances| Moisture Balances | Pocket Scales| Portable Balances| Precision Toploade

    Balances| Price C ompu ting Scales| USED & Demo Balances| Contact Us| Return Po licy| Home

    Have Questions? Call 978-521-7095 or e-mail usyour quest ions and we will assist you in your selection.

    Copyright 2012 Precision Weighing Balances, All Rights Re served.http://www.balances.com , balances.net, balances.org, analytical-balance.com , analytical-balances.com, dietscale.com, gxbalances.com

    lab-balances.com, moisture-balances.com, moisture-balance.com, pocket-balances.com, pocketscale.com, pocket-scales.com,precision-balances.com, precision-balance.com, scalesforsale.com, scaleforsale.com, scaleman.com , scale-galore.com, scales-

    galore.com, scalenet.com, weigh.net, weigh.org, & calibrationweight.comare all registered domains of Precision Weighing Balances.

    http://history.go%28-1%29/http://www.calibrationweight.com/http://www.weigh.org/http://www.weigh.net/http://www.scalenet.com/http://www.scales-galore.com/http://www.scale-galore.com/http://www.scaleman.com/http://www.scaleforsale.com/http://www.scalesforsale.com/http://www.precision-balance.com/http://www.precision-balances.com/http://www.pocket-scales.com/http://www.pocketscale.com/http://www.pocket-balances.com/http://www.moisture-balance.com/http://www.moisture-balances.com/http://www.lab-balances.com/http://www.gxbalances.com/http://www.dietscale.com/http://www.analytical-balances.com/http://www.analytical-balance.com/http://www.balances.org/http://www.balances.net/http://www.balances.com/http://www.balances.com/mailto:[email protected]://scaleman.com/http://scaleman.com/customer-service#returnshttp://www.balances.com/contact.htmlhttp://demo.scaleman.com/http://price-computing.scaleman.com/http://precision-toploading.scaleman.com/http://portable-toploaders.scaleman.com/http://pocket.scaleman.com/http://moisture.scaleman.com/http://mechanical.scaleman.com/http://bench.scaleman.com/http://crane.scaleman.com/http://floor.scaleman.com/http://counting-scales.scaleman.com/http://calibration.scaleman.com/http://baby.scaleman.com/http://analytical.scaleman.com/http://hot-buys.scaleman.com/http://www.scalenet.com/applications/comparison.htmlhttp://www.scalenet.com/applications/summary.html

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