THORLABS DC4104, Руководство по эксплуатации

Страница: 12 / 56

© 2018 Thorlabs 10
DC4104
3.1.1 Constant Current Mode
The 'Constant Current Mode' provides a constant non-modulated LED current.
The actual current for each channel is displayed. If you connect a Thorlabs LED with an internal
EEPROM or the 4 Color LED LED4Cx, the corresponding wavelength will displayed instead of
the channel number. There are two different output modes, 'Single Selection' and 'Multi Selec-
tion'. The output mode can be selected in the 'Setting' menu (see
Settings) .
The 'Multi Selection Mode' is illustrated by square indicators. More than one LED at a time can
be switched on and is indicated by a little check mark in the square box.
The 'Single Selection Mode' features small circles as output indicators, which are filled with a
dot when the LED is on. Only one LED at a time can be switched on within this mode. This is
convenient when you want to switch between two LEDs quickly. It is not necessary to switch a
LED off prior to switch on another LED.
Select a channel with the multicontrol knob and press the 'LED' button to switch the LED on or
off, respectively. If you press and hold the 'LED' button for more than 3 seconds you will switch
on all LEDs at once. If all LEDs are switched on, you can switch them off by press and hold the
'LED' button for more than 3 seconds.
If no LED is connected to a channel it will be marked with 'n/a'.
In order to change the current of a certain channel, this channel needs to be selected using the
multicontrol knob and confirmed with the 'OK' button. A new screen appears and the current of
the selected channel can be set directly using the multicontrol knob. The change takes affect
immediately. To confirm the adjusted current, press the 'OK' button. To cancel the set current,
press the 'ESC' button. Both actions bring you back to the channel selection menu. The LED
current can be changed when the LED is off as well as when it is in operation. This allows to in-
crease or reduce the brightness of the LED. The current limit is displayed at the bottom of the
screen. In the upper left corner the selected channel is displayed.
Return to the main menu with the 'ESC' button.
The faster the multicontrol knob is turned, the greater is the adjustment ratio of the current. If
you move the knob slowly you can set the current with a 1mA resolution. If you move it faster
the resolution will increase up to a 200mA resolution.
14