Link Conditions - Newport 8000 User Manual

38 Chapter 3
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:
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Laser Diode Driver Module Operation