EXFO IQS-1500 Power Meters for IQS-500/600 - Manual (Page 77)

Calibrating Other Power Meters with the IQS-1500
Power Meters 69
Entering Calibration Uncertainties
The total uncertainty is calculated by adding (using the root of the sum of
the squares) the Type B, Type A and Reference Meter uncertainties and
multiplying the results by a factor of two to obtain a confidence level of
95 %, as shown in the following equation:
where
U
t
= total uncertainty
U
Bi
= Type B uncertainties
U
Ai
= Type A uncertainties
U
1500
= IQS-1500 calibration uncertainty
The mandatory Type B uncertainties are:
³
Source power stability
³
Reference Meter spectral sensitivity
³
DUT spectral sensitivity
³
Setup reproducibility
U
t
2
U
2
Bi
3
-----------
⎝ ⎠
⎛ ⎞
i
∑
U
2
Ai
N
------------
⎝ ⎠
⎛ ⎞
i
∑
U
1500
2
-------------
⎝ ⎠
⎛ ⎞
2
+ + Ч =