Measurement uncertainty

[Olbor]

Hey guys! I'm new here, so firstly- hello!
I've a exercise to from Metrology.

Evaluate measurement uncertainty for the following measurement:
1. Measurement quantity: length of a bar L = 500 mm
2. Material of the measuring object: steel
3. Temperature range in the measuring room: 14 to 26 °C
4. Measurement instrument: Micrometer; digital (resolution 0,001 mm)
- Uncertainty of calibration: U = 2 µ m + 4 × 10-6 × L
5. Temperature difference between the measurement object and the measurement instrument:DT = 2 °C

 

I have problem because I'm now on exchange, and this is my first time with Metrology. I didn't had any lectures, practice and etc. In internet I found a lot of things about that, but with another excercise I don't know how to use this data. I'm waiting for any help!

[studiot]

There is one vital fact missing from your list.

 

At what temperature is the bar 500mm?

(you will also need to look up the temperature coefficient of expansion of steel.)

 

Then calculate the maximum and minimum possible measurements, given the other data.

Edited June 28, 2014 by studiot

[Olbor]

There is one vital fact missing from your list.

 

At what temperature is the bar 500mm?

(you will also need to look up the temperature coefficient of expansion of steel.)

 

Then calculate the maximum and minimum possible measurements, given the other data.

From which formula Can I calculate it?