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6 Operating Instruction

6.3.2 Changing Parameters

To set or change a numerical parameter in the channel menu, select the respective line with the

cursor:

Example: Change ILD:

Pressing the soft key CHANGE activates the tuning knob to change the selected parameter. If the

parameter is only to toggle (e.g., the polarity of the laser diode), the function of the soft keys will

change:

Pressing the right soft key changes the sensor; pressing the key terminates the procedure.

Note

Some parameters can not be changed, as they are measurement values (i.e. the TEC voltage) or

cannot be changed while the TEC current output switched on. In these cases the access is denied

indicated by a long beep.

6.3.3 Selecting the Polarity of the Laser and the Monitor Diodes

To change the polarity of the laser diode select the parameter

LDPOL = and select the desired polarity with CHANGE and toggle with AG/CG.

To change the polarity of the monitor diode select the parameter

PDPOL = and select the desired polarity with CHANGE and toggle with AG/CG.

6.3.4 Calibration of the Monitor Diode

In order to display the correct optical power based on the monitor current, the actual efficiency

coefficient C of the monitor diode must be entered.

Select the parameter C.

C = 0.2000A/W

If, for example, C is 0.5 A/W this can be entered in the channel menu by pressing the soft key

CHANGE and changing the default value using the tuning knob. Then press the key to

terminate the procedure.

THORLABS ITC8000 User Manual

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