The actual method of operation is the same as Example 1, except that:
For example AP1, AP2 are the readings from one meter, and BP1, BP2 are the readings from the other.
Averaged link insertion loss in linear units = (AP1+BP1-AP2-BP2)/2 where all measurements are in linear units
[If you use meters with a reference facility, the calculation becomes:
Averaged link loss in linear units = (link loss measured by meter A + link loss measured by meter B)/2 ]
Note that use of this technique eliminates calibration accuracy as an issue, leaving only meter linearity and short term source stability as instrument limiting factors.
In this situation ‘Autotest’ type features can result in better measurement confidence, lower skill requirements and twice the productivity for dual wavelength measurements.
|Source, incl. mandrel wrap if multimode|
|DUT Device Under Test (system being tested)|
[instructions on use of the relative mode are in italics]