38 Chapter 3 Laser Diode Driver Module Operation
3.5.4.1 Mod Enable
Mod Enable
turns the modulation circuit on or off.
3.5.4.2 Mod Frequency
The modulation circuit is capable of a frequency between 200 Hz to 300 kHz. Below
2 kHz, the frequency is displayed in Hz, while above 2 kHz, the frequency is
displayed in kHz.
3.5.4.3 Mod Amplitude
Modulation amplitude is entered in milliamps. The amplitude is the positive and
negative amplitude of the sine or square wave around the Io set point. The actual
Mod Amplitude
set point has a resolution of 1% of the full scale output. When
changing
Mod
Amplitude,
Io min
and
Io max
are recalculated using the Io set point
and the new modulation amplitude to derive
Io min
and
Io max
. For example, if the
set point was 50 mA and the amplitude was 15 mA,
Io min
would be recalculated at
35 and
Io max
would be recalculated at 65. Changing
Io min
or
Io max
was a
similar effect on
Mod Amplitude
and the Io set point, but in reverse. See section
3.5.4.5 below.
3.5.4.4 Mod Type
Mod Type
selects the type of waveform generated by the modulation circuit: square
wave or sine wave.
3.5.4.5 Io min and Io max
Io min
and
Io max
can be used in place of the Io set point and
Mod Amplitude
to
set the top and bottom Io levels for the modulation output. Because these values are
calculated based on the Io set point and
Mod Amplitude
and not stored, they are
displayed as a “Modulation Calculator”. Changing either of these values will change
the set point and amplitude settings accordingly.
3.5.5 Link Conditions
The Laser module supports the following link conditions:
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
To Next Page
Loading...
