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OPERATION
General Operating Procedures
06_07 LDT-5525 15
CHAPTER 2
General Operating Procedures
The following sections present some guidelines for operation, as well as some
common operating procedures.
Warm-Up and Environmental Considerations
Operate the LDT-5525 Temperature Controller at an ambient temperature in the
range of 0 to +40°C. Storage temperatures should be in the range of -40 to +70°C.
To achieve rated accuracy, let the LDT-5525 Temperature Controller warm up for
about 1 hour before use.
Temperature Mode Operation
You can operate the LDT-5525 Temperature Controller in several modes, constant
current (I TE), constant thermistor resistance (R), or constant temperature (T).
This example is for constant temperature (T) mode.
a Plug the LDT-5525 Temperature Controller into an AC power source supplying the
correct voltage and frequency for your unit (refer to the back panel for the correct
ratings).
b Turn on the LDT-5525 Temperature Controller. The OUTPUT stage will be off at
power up and the unit will automatically configure its parameters to the state which
existed when the power was last shut off.
c Press the ENBL switch in the ADJUST section of the front panel so that the indicator
is lit (adjustment enabled). Press the MODE switch until the T mode is selected.
d Check the setting of the SENSOR SELECT switch for the desired operation. The
sensor code will be displayed for two seconds during the power-up sequence.
e Press the PARAMETER switch and check the setting of I LIMIT, T LIMIT, and GAIN.
Press the CAL switch and check the setting of C1 and C2 to insure that they are
compatible with the equipment you are using. Refer to Section 2.4.5 if you need to
change them.
f Press the DISPLAY switch until the VIEW SET indicator is lit and check the set point
temperature. If it requires changing, turn the knob until the desired value is displayed.
Note: In some cases, a greater than 0.1
o
C temperature set point resolution may be
attained by using R mode with the appropriate resistance value.
g Turn the TEC output on by pressing the OUTPUT ON switch. The unit will
automatically control the temperature to the set point.
h When the unit is powered off, the state of the unit at power-down is saved in non-
volatile memory.