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Relative measurements are
always displayed in dB.
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Measuring Power
Measuring Absolute and Relative Power
Wavelength The parameter λ shows the wavelength setting for
best performance of the optical head(s). It will change if you turn
the internal laser on or if you activate the secondary internal laser
source by pressing
1550
nominal, but the real source wavelength.
When measuring the absolute power of LEDs or laser diodes, you
must change this setting because the sensors are wavelength-
sensitive.
To change the wavelength press λ. Use the rotary knob to set the
new value, press
E
NTER
Unit The "Unit" parameter shows the measuring unit for the
optical power. By pressing
W(atts).
3 Press M
and
P
ORE
REVIOUS
Storing a Reference Value
You may want to store one of the two measured values displayed as
a reference for future measurements.
1 The parameter "Head" indicates the "active" optical head. If it
does not indicate the head whose value you want to store, press
H
A
or
H
B
EAD
EAD
2 Press
D
–>R
to store the value. It is displayed as "Ref" on
ISP
EF
the screen.
77
or 1310, respectively. It shows not the
or E
to store.
NTER
U
you can toggle between dBm and
NIT
to return to the "Powermeter" screen.
respectively.
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