THORLABS CLD101 Series, Operation Manual

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© 2018 Thorlabs
2 Operation
23
·
Temperature protection : Select
the required action in case the laser temperature
exceeds the desired operating temperature range
("Temperature window"). The temperature window
is centered to the laser Temperature Set Point.
Available actions are:
1. None
2. Pause - the laser current is switched off and
automatically switches on again, when the
temperature is back within the given range. The
return of the laser to operation can be delayed
additionally (see
Protection Reset Delay below).
3. Switch off - the laser current is switched off, when the temperature window is exceeded.
After the temperature returns to the allowed range, the laser can be switched on manually
only.
·
Protection Reset Delay : The return to operation can be delayed for up to 600 sec.
·
Temperature Window : Defines the allowed operating temperature range to (T
set
± T
w in
/2).
Interlock
Another safety feature is the hardware interlock, accessible via the I-LOCK connector (5) on the
rear panel. By default, a short circuit jumper is installed to the jack.
The interlock interface represents a current source (~16 mA when laser is
switched on), where the voltage across the external circuit is observed. As
soon as this voltage rises above a certain threshold (~ 2.5 V), the external
circuit is considered "open" and the laser current output is disabled.
Instead of the jumper, an external emergency switch (opener) can be
connected to the interlock, as well as an external circuit (total resistance <
430
W
) or by a LED (anode to center pin, cathode to outer pin, connect in
parallel resistor R=1 k ) alerting that the laser is switched on.
Note
Do not use blue LED due to their high forward voltage.
2.5.6 Photodiode Input
Photo Diode Input settings - CLD1015 and CLD1010LP
Use the arrow buttons to select a
parameter, then push EDIT button, or
push the selected topic a second time.
·
Input Current Range : There are
two ranges - max. 2mA (LOW) and
max. 20mA (HIGH). Push EDIT button,
then select the required measurement
range.
·
Photodiode BIAS : If the
photodiode needs to be biased,
enable the bias voltage by either
clicking to the text or by pushing the
EDIT button (toggle function). The BIAS Voltage Level can be set between 0.1 and 6.0V -
select the topic and push EDIT.
7