Datasheet

7.2 Calibration procedures
10. Current adjustment
a) Set the selector (3) to mode Setting
◦
C and adjust the temperature value
to 25
◦
C by means of the Set Temperature 5 tuns potentiometer P8 (2).
b) On the external power supply, rise slowly the voltage to 30 V and the cur-
rent to 1.5 A: the tension should stabilize at 30 V.
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 5.
c) Set the selector (3) to mode Real I: the displayed value should be ≤ 1A.
d) Set the selector (3) to mode Real
◦
C: the value displayed should tend to
the defined value. If not, adjust P3.
e) Wait for a certain time and check the Peltier temperature with a thermome-
ter
f) Set the selector (3) to mode Setting +I.
g) Increase the limit of positive current to 3.5A by means of the +I trimmer (4)
located on the front panel.
h) Increase the limit of negative current to 5A by means of the -I trimmer (5)
located on the front panel.
i) Change the temperature reference to -25
◦
C and check the displayed cur-
rent.
1
Figure 7.15.: TCU main board, current adjustment.
c
2012 SA 91