Checking The Stability Of The Setup; Explanation Of The Result; Measuring The Return Loss - Agilent Technologies HP E5574A User Manual

Taking Standard Loss Measurements

Measuring the Return Loss

Checking the Stability of the Setup

1 Press M .
ORE
2 Press S .
TABILITY
3 Check the stability value. Refer to page 31 in section 1.6
"Getting Started" for information on the stability value.
4 Press P to return to the previous page and read the PDL.
REVIOUS

Explanation of the Result

The IL value is calculated according to the following formula:
Insertion Loss
IL (dB) = – 10 log [P / P ref]
A/B A/B
3.2 Measuring the Return Loss
This section explains how to measure the Return Loss, i. e. the ratio
of the optical power launched into a device to the power reflected
back to the source.
The Return Loss can only be measured by using the internal light
source. Before you start measuring the Return Loss of a device
under test (DUT), you need to calibrate your setup.
ATTEN TI O N Before you calibrate the OLA for Return Loss, it
is advisable to zero the optical head you are going to use. If you have
not yet zeroed the head, refer to section 1.6 "Getting Started" on
page 31.
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