NKT Photonics A203-000-001, Руководство по эксплуатации продукта

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Signaling and CONTROL configuration
76
Modulating
emission power
To modulate the amplitude of selected channels, a modulating signal can be
connected to the MOD1-8 signals (i.e. instead of them being pulled high). For
four-channel or four-profile FWS configurations only MOD1 is connected to a
varying signal to modulate the channels. Use MOD1 to MOD8 as needed to
modulate channels in a 16-channel FWS configuration.
Modulation amplitude
CONTROL must be configured for the modulation signal range. See
“VIS/NIR or
NIR/IR modulation gain” on page 48
.
Simulate modulation
1. Using a 4-channel FWS configuration, connect the 0-10 V output pin of the
COMMAND to MOD1 instead of the +3.3 V output.
2. Set the modulation gain in the Setup page to the 0-10 V range (see
“VIS/NIR
or NIR/IR modulation gain” on page 48
.
3. With the system running, vary the voltage of the 0-10 V pin using the
adjustment knob next to the pin.
4. Observe that the output emission level varies directly with the 0-10 V output
pin voltage.
Figure 51 Fast wavelength switching: simulated modulated 4 λ setup
Wavelengths 1 to 4 Selection
in
Blank
in
Test
Outputs
CONTROL Channel/Profile
ch1 - profile 3
ch1 - profile 4
AOTF channel selected
ch1
profile 1
ch1
profile 2
ch1
profile 3
ch1
profile 4
V+
0V
V+
0V
FSK1
in
Blank
in
MOD1
in
Application
Sig
nals
ch1 - profile 1
ch1 - profile 2
0V
10V