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Operation
By default if the Model 1140A is in source mode and the Model 1120 Remote Emulation option
is not enabled, when power is turned on the unit will be in standby mode as indicated by the
blinking annunciator in the lower right corner of the display. In standby, the output terminals are
disconnected from the voltage source within the instrument. The OPR/STBY (ENTER) key toggles
standby off or on. No other action by the operator will affect this control.
Ac Operation
When the Model 1140A is plugged into an ac power source in the range as stated in
under
Ac
Operation, the unit is operating in the ac-power mode, and the battery pack (if
installed) will charge as necessary.
Dc Operation (Battery Option Only)
When the battery pack has been properly charged the Model 1140A will operate (without being
plugged into an ac power source) by simply pressing the POWER push button. When the battery
pack is fully charged, the Model 1140A will operate for more than six hours without recharge.
Recharge
When the Model 1140A battery pack is fully discharged, it will recharge in less than three hours.
Menu Key
Pushing the MENU key takes the user to the MAIN MENU from which all settings can be viewed
and changed. Additionally, MENU can be used as a total-escape key from any menu or screen
back to the operating screen of the main display.
Enter Key (Operate/Standby)
The ENTER key allows the user to change settings. Additionally, in source mode at the operating
screen this button toggles standby mode on and off.
Escape Key
Pressing the ESC key allows the user to go back to the previous screen or setting without having
made a change.
Twelve-key Keypad
The KEYPAD is used for direct entry of numbers both on the operating screen and in the menu
options that require a numeric value to be entered. Numbers to be entered can always be entered
directly or can be arrived at using the ARROW KEYS and the ENTER key or the ENCODER in its
CAUTION
The battery pack used in the Model 1140A must be
charged at least once every two months. If this is
not done, the user risks the possibility that the
battery-pack voltage will decay beyond its ability to
recover.
4-2
Section
II,
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