User`s manual

Page 16 · 4200-DR Series LaserSource User’s Manual
Saving and Restoring Configurations
Using the Main Menu » System Menu » Config menu item, or the *SAV and
*RCL commands over the computer interfaces, 4200-DR allows you to save up
to four configurations. Each configuration will store all of the instrument settings
(except scripts and the function key definitions), and allow you to quickly recall
them. This is particularly useful when the instrument is used in multiple setups,
and the particular configuration of each setup can be stored and later recalled
for a quick reconfiguration.
To store a configuration, simply change the Config menu item to select which
configuration slot you want to store the current configuration into. The
instrument will generate a message indicating the save was successful (or not).
You can also use the *SAV command over the computer interface to do this as
well.
To recall a configuration, change the Config menu item to recall the
configuration you would like to use. You can also use the *RCL command over
the computer interface to do this as well.
A special option for the Config menu item is Defaults, and as the name implies,
it will restore the unit to factory default configuration, however, scripts and
configurations are not erased, and user calibration data is not cleared. To erase
user calibration data, you must use the Reset Cal menu item found in the Laser
User Cal menus, or manually adjust each user calibration entry to 1 (for slope) or
0 (for offset). See Field Calibration, below, for more details.
Laser Control Modes
The 4200-DR offers up to five laser control modes: Io (ACC), Io HiBW (ACC),
Im (AMC), Po (APC), and Vf (AVC).
Changing the control mode is done through the menu by changing the Mode
parameter in the menu to one of these values.
Io and Io HiBW modes (referred to collectively as ACC, or automatic current
control modes) are used to drive a specific current through the laser diode.
When in this mode, the set point will be in milliamps, and the 4200-DR will drive
the desired current through the laser diode as long as the voltage at the chosen
set point does not exceed the voltage limit. In Io mode, you will be limited to less
than a 10 Hz bandwidth. To modulate above that rate, use the Io HiBW, which is
a high bandwidth current mode supporting modulation.
Im mode (also referred to as AMC, or automatic monitor photodiode control,
mode) is used to control the laser diode using the monitor diode feedback. You