Teledyne LXT-220 - Manual (Page 16)

Introduction LXT-220 DO
Teledyne Analytical Instruments 16
1.4 Front Panel
The operator interfaces with the instrument from the front panel.
Figure 1-1 shows a standard single channel LXT-220 DO instrument
front panel. The panel includes the LCD display capable of outputting
information in both a textural and graphical format. There are 6
membrane switches (keys) that control the operation of the unit. The
keys are in two groups:
MENU SELECT: UP/DOWN (▲/▼) These keys are used to
change the display menu and move the cursor vertically. Any
menu can be accessed using the appropriate MENU SELECT key.
These keys are also used to exit the calibration mode and save
calibration data.
CALIBRATE KEYS: UP/DOWN/LEFT/RIGHT (▲/▼/◄/►)
The horizontal CALIBRATE keys are used to enter the calibrate
mode and move the cursor horizontally. To enter the calibrate
mode, both horizontal CALIBRATE keys must be pressed
simultaneously. Once in the calibrate mode, the cursor can be
positioned by pressing the appropriate individual CALIBRATE
key. These keys are also used to select an item from a menu. See
Section 3.1)
The vertical CALIBRATE keys are used to perform numeric
adjustments to displayed values. Pressing the ▲ CALIBRATE key
will increase the value; pressing the ▼ CALIBRATE key will
decrease the value.
Figure 1-1: LXT-220 Front Panel