29
Getting Started
Using the Attenuator
1.1 Using the Attenuator
N O T E
Before using the instrument, you should make sure that it is properly
warmed up. The instrument is properly warmed up when it has been
switched on for a minimum of 45 minutes. Failure to do this can cause
errors of up to 0.04dB in the attenuation.
Set the attenuation of the filter using A
TT
(attenuation factor),
λ
(wavelength), and C
AL
(calibration factor).
Figure 1-1
The Attenuator Keys
The attenuation factor and the calibration factor set the position of
the filter. The calibration factor allows you to offset the value of the
attenuation factor.
Att(dB) = Cal(dB) + Attenuation
filter
(dB)
In addition, you can use D
ISP
→
C
AL
to transfer the current
attenuation factor to the calibration factor.
Using the Modify Keys
There are four modify keys on the front panel of the attenuator.
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