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52
Chapter 4
4.5.3.11
PD Zero
The PD Zero element is the photodiode offset that is removed from the photodiode
read back before any values are displayed, and conversely, is added to any
photodiode set point. The photodiode offset is a combination of any dark current or
stray light picked up while the laser is off. Pressing the PD Zero soft key sets this
element to the photodiode current that is present on the photodiode input. To clear it,
simply press the PD Zero soft key a second time. The oscillator channel of the
MOPA module does not support this setting.
4.5.3.12
The
Pushing the
4.5.4
Link Conditions
The laser module supports the following link conditions:
See the section 2.4.10 for a complete description of the linking process.
and
Soft Keys
(previous) soft key returns to the previous screen, while pressing the
(next) soft key advances to the next screen.
Condition
On
Off
Out Tol
In Tol
Io Lim
Vf Lim
Im Lim
Po Lim
Interlock
Open
Short
Laser Diode Driver Module Operation
Description
Laser output is on
Laser output is off
Laser is out of tolerance
Laser is in tolerance
Laser is current limiting
Laser has reached its voltage limit
Laser has exceeded photodiode current limit
Laser has exceeded photodiode power limit
Laser interlock is not closed
Laser module is open circuit
Laser module is shorted
Table 3 - Laser Link Conditions
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