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Introducing the HP E5574A Optical Loss Analyzer
Getting Started
How to Zero the Heads
1
Shield the optical head(s) from light.
Do one of the following:
•
Screw the protection caps onto the heads.
•
Interrupt the signal path (e. g. by turning the source off).
2
Press A
PPL
and activate “Powermeter”.
3
Press M
ORE
to view the
Z
ERO
softkey.
Most of the OLA
applications provide the
Z
ERO
softkey.
4
Press
Z
ERO
.
If there are two heads connected, both heads will be zeroed. The
message “Light A” or “Light B” will be displayed, if one of the
heads is still sensing a signal. In this case, zeroing is not
possible. You can either disconnect the second head or repeat
step one.
5
Wait some seconds until a power value is shown again.
6
Press A
PPL
to terminate the “Powermeter” application.
After zeroing, the instrument is ready to measure absolute power
values.
Note that the power range is independent of the source wavelength.
Even if you change the wavelength, there is no need to zero the
heads once again.
Storing the Reference Power
In order to measure the optical power loss of a device, you must
first measure and store the power transmitted to the device. As long
as you use one of the internal light sources and the same setup, this
is required only once after warm-up (unless the room temperature
changes drastically).
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