Uncertainty Measurement - What this accuracy specification "1% + 10^5": means?

Elsmar Forum Sponsor

Hershal

Metrologist-Auditor
Staff member
Super Moderator
#2
The 1% may be either of reading or full scale. That should be defined in the specification. Then add the 10^5. However, that likely should be 10^-5, otherwise the specification will be huge.
 

dgriffith

Quite Involved in Discussions
#3
Agree. Usually, by convention in the US anyway, a percentage without definition or clarification is 'of reading'. So, 1% of reading, plus 100,000 inches is my kind of specification. :)
Hershal is right. That should be 10e-5. Otherwise, we need more context to understand.
If the reading is 0.01, then 0.01x.01=0.0001 + 10e-5 = 0.0001+0.00001=0.00011. This is what it is, but
this is what it means:
The uncertainty value for the reading specification changes proportionally with the reading, but the 10e-5 will always be 10e-5. The uncertainty will never be less than that, even if the reading was zero.
 
Last edited:
Thread starter Similar threads Forum Replies Date
B IEC 60601-2-10 - Accuracy of Pulse Parameters - Required Measurement Uncertainty IEC 60601 - Medical Electrical Equipment Safety Standards Series 3
W Dimensional Measurement of 10% accuracy and 25% uncertainty standard General Measurement Device and Calibration Topics 6
P Measurement Uncertainty and Equipment Accuracy Measurement Uncertainty (MU) 2
N Is it normal if measurement uncertainty is less than equipment accuracy Measurement Uncertainty (MU) 2
T 4:1 Test Accuracy Ratio (TAR) or Stated Measurement Uncertainty (MU) General Measurement Device and Calibration Topics 21
A Measurement Uncertainty - Attenuation Accuracy Measurement Uncertainty (MU) 2
P Measurement Uncertainty (MU), Accuracy, Precision - Relationship? Measurement Uncertainty (MU) 6
G Does pitch/increment/resolution of a ruled scale apply to measurement uncertainty as line item? Measurement Uncertainty (MU) 10
R Uncertainty in measurement larger than tolerance Measurement Uncertainty (MU) 2
K ISO 17025:2017 clause 7.6.2 - Performing calibration of its own equipment shall evaluate the measurement uncertainty ISO 17025 related Discussions 6
G Reporting measurement uncertainty for custom items Measurement Uncertainty (MU) 2
K Measurement Uncertainty Budget (MU) of for Ultrasonic Thickness gauge Measurement Uncertainty (MU) 1
G Can Measurement Machine Bias be part of Uncertainty? General Measurement Device and Calibration Topics 1
D Difference between uncertainty and expanded uncertainty of measurement General Measurement Device and Calibration Topics 1
J Internal Laboratory Scope and Measurement Uncertainty (MU) IATF 16949 - Automotive Quality Systems Standard 1
C MU (Measurement Uncertainty) in an Internal Calibration Laboratory Measurement Uncertainty (MU) 1
B Measurement Uncertainty using Minitab Measurement Uncertainty (MU) 2
Marc Measurement Uncertainty Discussion Sub-Forum General Measurement Device and Calibration Topics 0
C Measurement Uncertainty fluctuates half a tick mark (20 millionths of an inch) Measurement Uncertainty (MU) 1
R MU (Measurement Uncertainty) of a Tensile Tester (e.g. Zwick Roell) Measurement Uncertainty (MU) 4
H Uncertainty Measurement Calculation in Chemical Testing Measurement Uncertainty (MU) 1
S MU (Measurement Uncertainty) for Oscilloscope Calibration Measurement Uncertainty (MU) 2
T Method Repeatability for MU (Measurement Uncertainty) Measurement Uncertainty (MU) 1
S Combined Uncertainty of an Indirect Measurement Measurement Uncertainty (MU) 8
N Uncertainty calculation for a voltage measurement Measurement Uncertainty (MU) 3
T Measurement of uncertainty for standard mechanical properties General Measurement Device and Calibration Topics 1
K New Gauges calibration certificate shows deviations from the measurement uncertainty IATF 16949 - Automotive Quality Systems Standard 5
A Calculating Combined Measurement Uncertainty - VDA 5 Measurement Uncertainty (MU) 1
T Uncertainty of Measurement vs. Tolerance Measurement Uncertainty (MU) 5
A Calibration Method and Measurement Uncertainty General Measurement Device and Calibration Topics 5
Geoff Cotton Measurement Uncertainty (MU) of HR-150A Rockwell Hardness Tester Measurement Uncertainty (MU) 1
Jerry Eldred When Does Resolution of Measurement Standard Apply in Uncertainty Calculations General Measurement Device and Calibration Topics 14
E Uncertainty Measurement for Water COD, TDS, TSS & pH Measurement Uncertainty (MU) 1
D General Procedure for Uncertainty Measurement Measurement Uncertainty (MU) 2
S Measurement Uncertainty for Neutral Salt Spray test to BS EN ISO 9227:2006 General Measurement Device and Calibration Topics 4
S Organizing Uncertainty Budgets for different Measurement Equipment Measurement Uncertainty (MU) 4
B Length Measure - Interpreting Calibration Results and Measurement Uncertainty (MU) Measurement Uncertainty (MU) 3
R Procedure for Measurement Uncertainty Estimation for Electrical Measurements Measurement Uncertainty (MU) 2
R Signal Conditioning Card - Calibration Measurement Uncertainty Measurement Uncertainty (MU) 5
K AATCC 81 pH test - How to calculate MU (Measurement Uncertainty) Measurement Uncertainty (MU) 2
optomist1 Definition Measurement Uncertainty - Standard definitions for Definitions, Acronyms, Abbreviations and Interpretations Listed Alphabetically 8
S Uncertainty Estimation in Temperature Measurement by K type Thermocouples Measurement Uncertainty (MU) 7
DietCokeofEvil ILAC-g8:03/2009 - Reporting Results with Measurement Uncertainty General Measurement Device and Calibration Topics 7
N Rounding the Numerical Value of the Measurement Uncertainty Measurement Uncertainty (MU) 2
A Uncertainty of Measurement for Calibration Laboratory? Measurement Uncertainty (MU) 8
C How to interpret Measurement Uncertainty (MU) Measurement Uncertainty (MU) 3
S ISO 19036 - Measurement Uncertainty for Microbiology Measurement Uncertainty (MU) 7
P Measurement Uncertainty Calculations Spreadsheet help General Measurement Device and Calibration Topics 4
L Measurement Uncertainty using Control Chart Measurement Uncertainty (MU) 2
P Uncertainty Measurement for Colour, Odour, Taste, Turbidity, Total Suspended Solids Calibration Frequency (Interval) 2

Similar threads

Top Bottom