16
OPERATION:
(Con’t)
TEMPERATURE CALIBRATION: (Con’t)
To access the temperature calibration mode, use the following procedure:
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Press heat on button and, while continuing to hold, press and release the
heat off button. Now, release the heat on button.
The decimal point should now be flashing indicating that the unit is in the
temperature calibration mode.
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Use the Up and Down arrow keys to adjust the temperature on LED
readout to match the temperature reading on the thermocouple meter.
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Press the heat off button. The beeper will sound indicating that the new,
calibration value which you have entered is now stored in the nonvolatile
memory of the temperature controller.
NOTE:
IT IS IMPORTANT TO PRESS THE HEAT OFF BUTTON TO EXIT THE
CALIBRATION MODE.
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Press heat on button to complete return to normal operating mode.
PHONE JACK FOR OPTIONAL RECORDER:
To make a record of the chamber temperature as shown on the LED
readout, plug a recording device into the ¼-inch (6 mm) phone jack on the back
of the unit. Output voltage is 10 mV per degree-C; output impedance is 1 K-
ohm. The recording device should have a minimum input impedance of 10 K-
ohm and should be set for a minimum range of 0 to 1 VDC.
MICROPROCESSOR LOCK-UP:
In the event that microprocessor lock-up should occur, use the following
procedure to solve the problem:
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Disconnect unit from power source. Leave the power switch ON.
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Press both the
SPEED UP
button and the
TIMER DOWN
buttons and
HOLD them.
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While continuing to hold the 2 buttons, plug unit back into wall outlet.
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Reset is now accomplished.
Microprocessor lock-up conditions are generally caused by disturbances
on the AC line. It would be helpful to install a line filter or conditioner between
the
AC line and the unit to prevent the situation from occurring again.
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