OPERATION
LDC-3900 Front Panel
20 LDC-3900 Series
CHAPTER 2
current) values may be selected to appear on the TEC display. The set point
mode is determined by the TEC Mode selection.
Any of the measured TEC values may be displayed by pressing the desired TEC
Display switch. When a measurement display mode (T, R, or ITE) is selected by
pressing its switch, the (TEC Display) Set Indicator LED will go off (if previously
on).
Refer to Figure 2.8 on page 13 for the discussion of the TEC Display switch
section features.
Figure 2.17 LDC-3900 TEC Display Switch Section
TEC Display Set
When the (TEC Display) Set switch is pressed, the (TEC Display) Set switch
Indicator and the (TEC Display) Indicator of the set point mode (T, R, or I
TE
) will
become lit, if they are not already lit. The set point may then be changed by
turning the Adjust Knob, within three seconds of releasing the (TEC Display) Set
switch. The (TEC Display) Set switch may be held in while the Adjust Knob is
being turned, but it is not necessary.
Three seconds after releasing the Adjust Knob, or the (TEC Display) Set switch
(whichever occurs later), the new value will be stored in non-volatile memory and
the TEC display will revert to the original display mode (measured T, R, or I
TE
).
If the TEC Display is set to a mode that is different from the selected TEC Mode
when the Adjust Knob is turned, the TEC Display will automatically switch to the
same mode selected in the TEC Mode section (seeAutomatic Set Point
Adjustment on page 17).
The (TEC Display) Set mode is determined by the TEC Mode selection. If it is
desired to change a set point for a mode other than the present TEC Mode
selection, it is first necessary to select the desired TEC Mode (see TEC Mode
Indicators on page 19).
TEC Display Indicators and Switches
The T indicator becomes lit when temperature is displayed. When the T switch is
pressed, the display will show measured temperature in
×C. If the Set switch is
then pressed (and T mode is selected in the TEC Mode section), the display will
show the temperature set point value in
×C.
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