Zeroing The Heads - Agilent Technologies HP E5574A User Manual

Though it is not a must, it
is recommended that the
heads be zeroed once after
the warm-up time. This
ensures that the OLA will
use the full sensitivity
range of the heads.
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Introducing the HP E5574A Optical Loss Analyzer
Getting Started
In refresh mode, this value can change as the measuring window is
a sliding window which is updated continuously. However, the
accuracy of the PDL value will not improve over time.
In average mode, the measurement will continue and take an
average over a second time window. After twice the time the PDL
result is displayed and will not change any more. The display will
blink during taking of the measurement and the average.
To change the setting press
Optimization of the Head(s) Standard setting is "Low PDL":
The power range is reduced to -64 dBm, but you get the highest
possible polarization sensitivity (0.003 dBpp PDL). This setting is
recommended for all polarization dependent measurements. It is
only applicable if you use the optical heads HP 81521B opt. 001.
You can change the standard setting to "High sensitivity": You get
the maximal power range (-80 dBm), but less polarization
sensitivity (0.012 dBpp PDL typical).
To change the setting press
between these modes.
To return to the last application or menu prior to pressing P
press P .
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Zeroing the Heads

Loss measurements are relative measurements, comparing the
optical power transmitted to the device under test (DUT) with the
power returned from the DUT.
Zeroing the heads is only necessary, if you wish to use the OLA to
measure the absolute output power of optical devices. Zeroing is
only required once after warm-up.
33
M .
ODE
O . Allow 20 s for switching
PTIMIZE
,
RESET