YSI 6 series User Manual page 141

650 MDS Section 3
Note that the screen is divided into two sections – the "Main Display" at the top and a "Status Bar" at the
bottom. The Main Display will provide access to the 650 and sonde menus and will be used to view sonde
sensor readings in real-time, to configure the 650 and the sonde, to calibrate the sonde sensors, and to log
data to either sonde or 650 memory. The Status Bar will always show the date and time of the 650 clock
(updated in real-time), the remaining battery capacity, the current barometer reading if you have purchased
this option, the GPS readings from a user-supplied GPS instrument, and will indicate whether the menu
being viewed in the Main Display is associated with your sonde or the 650. Additional information about
the Status Bar will be provided in Section 3.2.10 of this manual.
You may also want to take the instrument into a dark room and, with the instrument turned ON, press the
backlight key which is located at the top right of the keypad. The instrument backlight should illuminate
the LCD so that the display can be read. Pushing the backlight key again will turn the backlight off. The
backlight will power off automatically after two minutes of non-use.
3.2.7 ADJUSTING THE DISPLAY CONTRAST
The contrast of the 650 display is automatically temperature compensated to provide a proper display under
most field conditions (-10 to 40 C). Some users, however, may wish to alter the display contrast to meet
their own preference. In addition, if the instrument is used at more extreme temperatures, the display is
likely to require some adjustment.
The contrast is easily adjusted by pressing and holding down the backlight key in the upper right of the
keypad and then pressing repeatedly or holding down the up/down arrow keys while observing the display.
Pressing the up arrow while holding down the backlight key increases (darkens) the contrast; pressing the
down arrow under these conditions decreases (lightens) the contrast.
NOTE: The backlight itself will only be activated if the backlight key is pressed and released. You must
hold down the backlight key to adjust the contrast.
YSI Environmental Monitoring Systems Operations Manual 3-11