Ross ACO-4400A, User Manual, Page: 46 / 112

4–2 • Operating Basics ACO-4400A User Manual (Iss. 03)
Front Panel Overview
Figure 4.1 shows the ACO-4400A Front Panel. Descriptions of the Front Panel controls and
indicators appear below.
Figure 4.1 ACO-4400A — Front Panel
1. LCD Display
The dot-matrix LCD display is used to show system status, fault indications, and general in-use
information, as well as being used to configure the Menu system items.
2. Back Button
The Back push-button is used to exit the current Menu screen, and to traverse back through the
Menus, ultimately to the stand-by screen.
Pressing the dedicated push-button once will exit the current Menu level. When you have finished
editing the Menu options, you should use the dedicated push-button to exit the Menu system
completely. You need to press the button a suitable number of times to get back to the stand-by
screen (the one with the “Ross” logo, one press “up” from the top level Menu) - this will save any
changes that you have made to the non-volatile memory.
3. Rotary / Push Control
The Rotary / Push control has two functions:
• the rotary function is used to navigate up or down items in a Menu, or to cycle through a
range of values relating to a Menu item,
• the push function is used to confirm a Menu item selection for editing, to exit Menu item
editing, or take you “forward” to the next Menu item.
Selecting or editing Menu items requires you to turn the Rotary Control in order to select or
change the highlighted Menu item / setting, then to press the Rotary Control to select or confirm
that Menu item / setting. Pressing the Rotary Control will select the highlighted Menu item for
editing, exit Menu item editing, or take you to the next Menu level. Note that there may be more
Menu lines available than can be displayed on the LCD screen; be sure to scroll down (or up) to
find the required entry.
4. Removable Power Supplies (Not Shown)
There are two Removable Power Supply assemblies, installed and secured into the front of the
ACO-4400A, either side of the LCD display. These units can be “hot swapped”, i.e. they can be
removed or inserted while mains power is still present. Should it become necessary to replace one
or both of the Removable Power Supply assemblies, the instrument does not have to be removed
from the rack.
ACO-4400A AUTO CHNG
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