OPERATION
LDC-3900 Front Panel
10_15 LDC-3900 Series 27
CHAPTER 2
Laser Display Set
When the (Laser Display) Set switch is pressed, the (Laser Display) Set Switch
Indicator and the (Laser Display) Indicator of the set point mode (I or I
PD
/P
PD
) will
also become lit, if it is not already lit. The set point may then be changed by
turning the Adjust Knob, within three seconds of releasing the (Laser Display) Set
switch. The (Laser 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 (Laser Display) Set switch
(whichever occurs later), the new value will be stored in non-volatile memory and
the Laser display will revert to the original display mode (measured I, I
PD
, P
PD
, or
V).
If the Laser Display is set to a mode that is different from the selected Laser Mode
when the Adjust Knob is turned, the Laser Display will automatically switch to the
same mode selected in the Laser Mode section (see Automatic Set Point
Adjustment on page 17).
The (Laser Display) Set mode is determined by the Laser Mode selection. If it is
desired to change a set point for a mode other than the present Laser Mode
selection, it is first necessary to select the desired Laser Mode (see Laser Mode
Indicators on page 26).
When (Laser Mode) P is selected, and the (Laser Display) Set switch is pressed,
the (Laser Display) I
PD/
P
PD
Indicator LED will become lit. If the CAL PD value is
zero, the I
PD
set point will be displayed, since the unit is in constant photodiode
current mode. If the CAL PD value is non-zero, the P
PD
set point will be displayed,
since the unit is in constant photodiode power mode.
Laser Display Indicators and Switches
The I Indicator becomes lit when laser drive current is displayed. When the I
switch is pressed, the display will show measured laser current in mA. If the
(Laser Display) Set switch is then pressed (and I mode is selected in the Laser
Mode section), the display will show the laser current set point value in mA.
The I
PD
/P
PD
Indicator becomes lit when monitor photodiode current or power is
displayed. When the I
PD
/P
PD
switch is pressed, the Laser display will show
measured monitor PD current in A or measured monitor PD power in mW (if the
CAL PD value is non-zero, see CAL PD on page 29). Pressing the I
PD
/P
PD
switch
again will toggle between current and power measurements.
If the CAL PD parameter value is zero, the Laser display will indicate "-.-" when
the P
PD
display is selected.
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