Think you know everything about Resolution Uncertainty?
What if I told you that you probably didn’t!
Not that I am trying to sound smart, but I too was surprised by how much information people should really know about resolution uncertainty.
Trust me! It is more complex than you ever imagined.
In this 30 page guide, I am going to teach everything that you need to know about resolution uncertainty and more. Here is the list of topics that I cover in this guide.
1. What is resolution uncertainty
2. Why is resolution uncertainty important
3. Resolution uncertainty and uncertainty analysis
4. Resolution uncertainty equations
5. How to calculate resolution uncertainty by device type
6. Convert resolution uncertainty to standard uncertainty
7. Overstating and Understating Uncertainty in Measurement
8. Examples of resolution uncertainty with pictures
Sure, I cover most of the standard stuff that I am sure that you already know from other popular uncertainty guides;
• What is resolution uncertainty,
• Why it is important, and
• How it relates to estimating uncertainty in measurement;
• How it is characterized; and
• How to convert it to standard uncertainty
But, what about the all of the information that most uncertainty guides leave out?
• How to determine resolution uncertainty,
• How to evaluate resolution by equipment type,
• How to sub-divide analog scales (not just 0.5R or 0.6R) ,
• How to convert to standard uncertainty with the square root of 12 and why, and
• Real world examples with pictures.
Do I have your attention now? If so, keep reading.
The biggest reason that I created this guide is I want you to learn is how to properly evaluate resolution uncertainty for your estimation of uncertainty in measurement.
Furthermore, I want you to know all of the options available to you, so you become an uncertainty calculation wizard like me.
Keep reading to see what you can expect to learn from this guide.
Resolution Uncertainty Equations
Instrument resolution can be evaluated several different ways. In this section, I will teach you all of the equations that you need to know to calculate resolution uncertainty.
Plus, I am going to show you how to subdivide the resolution of analog devices and scales to help you improve your uncertainty estimates and prevent you from reporting uncertainties that are larger than the instrument tolerances.
Resolution Uncertainty and Device Type
Resolution is evaluated differently depending on the type of device and how it operates.
In this section, I am going to teach you how to calculate resolution uncertainty step by step for 3 common categories of measurement equipment;
• Digital Devices
• Analog Devices
Reducing Resolution Uncertainty
If you have estimated uncertainty before, I am sure that you know that resolution uncertainty is characterized with a Rectangular distribution, has an infinite number of degrees of freedom, and gets reduced by dividing it by the square root of 3.
However, did you know that you divide resolution uncertainty by the square root of 12?
If not, I am going to teach why you can and how to do it.
Overstating and Understating Uncertainty
One of the biggest mistakes that I see people make is overstating and understating their uncertainty estimates. Many times, it is because instrument resolution was evaluated improperly.
Trust me, it has happened in my lab; and, I am sure that it has happened in yours too (whether you know or not).
I have even seen labs fail proficiency tests and get nonconformances because they understated resolution uncertainty in their estimates.
So, I decided to give you a few pointers to help you become more aware of potential mistakes so you can prevent yourself from making them.
Examples with Pictures
Everyone likes examples, especially with pictures. So, I really went out of my way to give you plenty of them.
In fact, this guide has 19 examples with pictures to show you, in detail, how I determined the resolution uncertainty of some of the most common measurement equipment.
I covered how you should evaluate resolution uncertainty for;
• Digital Multimeters
• Digital Pressure Gauges
• Digital Stopwatches
• Digital Scales
• Digital Calipers
• Digital Flowmeters
• Precision Analog Pressure Gauges
• Industrial Analog Pressure Gauges
• Differential Pressure Magnehelics
• Liquid in Glass Thermometers
• Dial Indicators
• Torque Wrenches
• Torque Screwdrivers
• Dry Gas Meters
• Variable Area Flowmeters
• Spring Scales/Force Gauge
• Calibration masses
• Gage Blocks