Pre-Settings; Setting The Limit Of The Laser Current I; Ld Lim; Setting The Limit Value Of The Tec Current - THORLABS ITC502 Operation Manual

1.8 Pre-settings

1.8 Pre-settings
To protect the laser diode the maximum possible current at the output of the ITC5xx
can be limited.
To protect the TEC element and the other components of the setup the maximum
allowed TEC current, the maximum temperature as well as an operating temperature
window may be selected.

1.8.1 Setting the limit of the laser current I

This hardware limit is set via the 25-turn potentiometer marked ADJ that is located
next to the LED I

LD LIM

continuously on the display if the display I

1.8.2 Setting the limit value of the TEC current

• Check the maximum allowed TEC current in the datasheet of your TEC element.
• Select the display I
• Change the limit value of the TEC current to the desired value with the
screwdriver-potentiometer besides the LED I

1.8.3 Setting the temperature window

• Check the type of temperature sensor in your setup.
• Select this sensor in the field marked "SENSOR".
• Decide upon the range of the temperature window (or equivalent resistance
window of your thermistor).
• Select the display T
• Change the size of the window to the desired value with the screwdriver-
potentiometer next to the LED T
if you select i.e. 5.000°, the window will reach from 5° below the set value to 5°
above the set value.
• Activate this function with DIP switch 5
(Refer to chapter 1.8.4, "DIP switch for "wake up" preset" starting on page 17)
ITC500 / page 16
at the front of the ITC5xx. The hardware limit is displayed
.
TEC LIM
.
WIN
. The display shows a "plus-minus" – value, so
WIN
LD LIM
is selected.
LD LIM
.
TEC LIM