Thermo NESLAB RTE Series, Installation, Operation, Basic Maintenance, Page: 37 / 52

- 36 -
Optional Analog Port/
Calibration (Digital Plus Only)
The analog signal is setup using the unit's Computer Setup Loop. With the
bath on, press and hold the Computer button for five seconds. The controller
will display
SErL . If needed, press the arrow buttons to toggle between 232 ,
485 , and A In . With A In displayed, press the Computer button again until
StorE is displayed, press YES. The Computer button will flash when A in is
enabled. Use the Computer button to enable/disable the analog signal.
The analog input and output are calibrated at the factory. If you need to
recalibrate follow the diagram until the display indicates
A in .
Pressing YES at the A in display and the display will indicate A iH . Press
YES and the display will alternate between A iH and some value. Apply 2.5V
to the analog input pin 15, see page 27 (analog ground is pin 6). Measure the
precise value with a voltmeter.
Change the value on the bath display to match the voltmeter reading.
Press SCROLL to check your value and
then press SCROLL again to display
A iL .
If desired, repeat the procedure for A iL .
Apply 0V to pin 15. Measure the voltage
and change the displayed value to match it
Pressing YES at the AoUt display and the
display will indicate A oH . Press YES and
the display will alternate between A oH
and 2.5000 , the bath will set the Temp Out
pin 7 output voltage to approximately 2.5V.
Measure the voltage and change the
displayed value to match it. Press
SCROLL to check your value and then
press SCROLL again to display A oL .
If desired, repeat the procedure for A oL .
The display will alternate between A oH
and -.5000 , the bath will set the Temp Out
pin 7 output voltage to approximately
-0.5V. Measure the voltage and change the
value to match the meter.
At the StorE display press YES to save the calibration, press No to abort it.
NOTE: If error code Er16 appears you will need to recalibrate.
Factory preset values:
A iH = 2.5000
A iL= 0.0000
A oH = 2.5000
A oL= -.5000
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