Connecting The Status Indicator; Connecting Laser- And Monitor Diode - THORLABS ITC502 Operation Manual

If T is settling up and down evenly around the value T
ACT
connected correctly however the values for the P-, I- and D-share of the control
loop are still incorrect.
(Refer to chapter 2.15.4, "PID adjustment" starting on page 45)
If T is settling properly to the value T
ACT
but the values for the P-, I- and D-share of the control loop might still be improved.

1.9.7 Connecting the status indicator

To indicate the operating status a standard LED may be switched between pin 1 and
pin 8. The LED will light up if the output for the TEC current has been switched on.
Poling and value of the TEC current is insignificant here.

1.9.8 Connecting laser- and monitor diode

Connect laser and monitor diode to the connector jack of the ITC5xx.
(Refer to chapter 1.9.1, "Pin assignment for the laser diode output" on page 20)
When measuring the voltage of the laser diode the wires for voltage measurement
(pin 6 and pin 9) have to be connected as close as possible to the laser diode to
avoid measurement errors.
The ground pin for the monitor diode (pin 2) may be connected to the ground pin of
the laser diode (pin 3). If this should be necessary (e.g. with laser diodes with
1
8
Figure 9
the TEC element is connected correctly
SET
TEC status display
1.9 Connecting components
the TEC element is
SET
ITC500 / page 27