Vidia-Discrete
General Operation • 15
5. Addressed Indicator:
This indicator is lit whenever the controller
is communicating over the computer interface (see the “Computer
Control” chapter beginning on page 23).
6. Remote Indicator:
This indicator is lit whenever the controller is
under computer control, via either the IEEE-488 (GPIB) or the RS-
232 interface. (See “Computer Control” on page 23.)
7. Wavelength, Current, and Power Displays:
Show the status of
the different laser parameters, as well as errors and system-
identification information. Units are nm, mA, and dBm,
respectively.
The current changes with the power and wavelength; it is not
adjustable. You can modulate the current through a back-panel
BNC input (see page 21). The display does not reflect any current
modulation.
The power display shows the power setpoint. It will display this
value even if the laser-diode power is off.
8. GPIB/RS232 Switch
: While pressing the
Local
button, hold this
switch up to view the GPIB address in the wavelength display; hold
it down to view the baud rate for RS-232 control. Use the
Wavelength Adjust
knob to adjust the address or baud rate.
9. Track Button:
Switches the laser between track mode, where you
can specify a set operating wavelength, and scan mode.
10. Wavelength Adjust Knob:
Adjusts the wavelength while in track
mode. Sets other parameters when other buttons or switches are
depressed (see “Control Combinations” on page 16).
11. Hi Res/Step Button:
In track mode, press this button to set the
wavelength with 0.001-nm accuracy (the wavelength display will
shift two decimal places).
In scan mode, starts an interactive step scan. Each time you press
the button, the laser will tune to the next step. (Step size can only
be set using computer control. For more on scanning, see page 20.)
12. Start/Stop
λ
Switch
: Display or set the start and stop wavelengths
for wavelength scans.
64X7 rev E.fm Page 15 Tuesday, April 3, 2001 4:16 PM
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