MSL Uncertainty Calculator
one entry only
accuracy of
uncertainty
degrees of
degrees of
u estimate
calculated
coverage
standard
freedom
freedom
factor
Cause of uncertainty Comment
u (n-1) k (%)
Insert cause 1 #NAME? comment on cause 1
Insert cause 2 #NAME? comment on cause 2
Insert cause 3 #NAME? comment on cause 3
Insert cause 4 #NAME? comment on cause 4
Insert cause 5 #NAME? comment on cause 5
Insert cause 6 #NAME? comment on cause 6
Insert cause 7 #NAME? comment on cause 7
Insert cause 8 #NAME? comment on cause 8
Insert cause 9 #NAME? comment on caused 9
Insert cause 10 #NAME? comment on cause 10
combined standard uncertainty #NAME?
expanded uncertainty #NAME?
effective degrees of freedom #NAME? #NAME?
coverage factor #NAME?
All formula cells are protected.
For each contributing cause enter:
1/ the standard uncertainty,
2/ one only of degrees of freedom, coverage factor, or accuracy of the uncertainty estimate, and
3/ a comment on the way the uncertainty was estimated
MSL uncertainty calculator version 1.0
This is a specific example of determining the uncertainty of calibrating a resistance meter.
A 10 000 ohm resistor is being measured by the resistance meter being calibrated.
The calibration certificate for the resistor gives an expanded uncertainty of 0.15 ohm with a coverage factor of 2.3.
The resistance meter gives a standard deviation of 0.22 ohm for 10 repeated readings.
Measurements are carried out at about 25°C. The calculated uncertainty applies to the fully corrected values.
MSL Uncertainty Calculator
one entry only
accuracy of
uncertainty
degrees of
degrees of
u estimate
calculated
coverage
standard
freedom
freedom
factor
Cause of uncertainty Comment
u (n-1) k (%)
Calibration certificate 6.52E-02 2.30 #NAME? Certificate applies at 20.0 ± 0.1°C
Standard deviation of 10 readings 2.20E-01 9 #NAME? Using the average of 10 meter readings
Temperature coefficient of resistor. 1.00E-01 2.0 #NAME? Measurements taken at 25 ± 2°C, ie a standard
deviation of 1°C. Temperature coefficient of
0.1 ohm/°C
Lead correction 2.00E-01 25 #NAME? Lead correction uncertainty estimated to be ±
0.2 ohm. This estimate is accurate to about
25%.
Insert cause 5 #NAME? comment on cause 5
Insert cause 6 #NAME? comment on cause 6
Insert cause 7 #NAME? comment on cause 7
Insert cause 8 #NAME? comment on cause 8
Insert cause 9 #NAME? comment on caused 9
Insert cause 10 #NAME? comment on cause 10
combined standard uncertainty #NAME?
expanded uncertainty #NAME?
effective degrees of freedom #NAME?
coverage factor #NAME?
Resistance meter example