Datasheet

7.2 Calibration procedures
IMPORTANT:
For the remainder of this procedure, limit the positive current to 1 A and the
negative current to 1.2 A using the 5 turns knob.
8. Temperature limit threshold
a) Measure the voltage on pin 2 of U10 (1): the value should be: 0.7V (= 70
◦
C) (If needed, adjust it with the trimmer P9(2)).
b) Power off the instrument.
9. Starting the power section of the instrument.
a) Remove the 100 E reference resistor from J8 (4) and plug the output cable
J8.
b) Plug the external cable into the LLH100, and verify that the Pt100 is pro-
prely mounted in the latter.
c) Use an external power supply (0-30VDC/3A) to simulate the internal power
supply.
d) Limit the current to 200 mA and connect it to main board J1 connector (3).
e) Power on the instrument and the external power supply.
c
2012 SA 89