Quantum Instruments Cascade Laser Starter Kit manual Current adjustment, → Value displayed ≤ 1A

Starter Kit Instruction Manual	Maintenance	51
Current adjustment
[28] Set the selector (3) to mode Setting ◦C
and adjust the temperature value to 25 ◦C
by means of the Set Temperature 5 tuns
portentiometer P8 (2).
[29] On the external power supply, rise slowly
the voltage to 30 V and the current to 1.5 A.
,→ The tension should stabilize at 30 V		1
Note: If the current is too high, stop the test
and verify the transistors Q1 to Q4 (1) and
their associated resistors.
There might be a soldering problem. In this
case, fix it and repeat the procedure from step
[10].
[30] Set the selector (3) to mode Real I.
,→ Value displayed: ≤ 1A.

[31] Set the selector (3) to mode Real ◦C.

,→ Value displayed should tend to the defined value.

[32]Wait for a certain time and check the Peltier temperature with a thermometer

[33]Set the selector (3) to mode Setting +I.

[34]Increase the limit of positive current to 3.5A by means of the +I trimmer (4) located on the front panel.

[35]Increase the limit of negative current to 5A by means of the -Itrimmer (5) located on the front panel.

[36]Change the temperature reference to -25 ◦C and check the displayed current.

Fig.47: TCU151 main board

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Fig.48: TCU151 front panel