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Operation
dual function. Pressing the polarity key at any time toggles the polarity of the reading. Also, the
+/− polarity key acts as a character-delete key when naming files in the MEMORY MENU.
Four Arrow Keys
The ARROW KEYS are used for navigation when in a menu and for cursor control and numeric
incrementing and decrementing when in the main operating screen. Changes made using the
ARROW KEYS are made in real time.
The left ARROW KEY has the additional function (not in real time) of erasing data input that has
been keyed in but not confirmed (by pressing the ENTER key or the ENCODER). For example if
the user enters 1.3456, pressing the left ARROW KEY will erase the digits one at a time starting
with 6, then 5, etc. This includes the decimal point but not the polarity symbol.
When naming files in the MEMORY MENU, the right ARROW KEY allows the user to append
characters to the name. For example, when naming a file, "A" is the starting default. The user can
then change that character and then by pressing the right ARROW KEY, append another character
to the file name.
The up and down ARROW KEYS have the additional function, when using the keypad for direct
entry in source mode, to allow the user to key in either °C or °F without having to go into the
menus. The only requirement is that the unit be in temperature mode (MAIN MENU / INSTRUMENT
MODE / OUTPUT MODE). When entering temperatures in this manner, the °C and °F keys act as
the ENTER key. For example, when the user keystrokes 125°C, the action is complete, and the
unit will output the equivalent voltage. If the user then keystrokes 200°F, the action is again
complete, and the the unit will output the equivalent voltage. When the °C or °F key is used, the
system unit of temperature is changed as well. That is, if the user keys in 125°C and then wishes
to key in 200°C, it can be accomplished either by using the °C key or by keying 125 and pressing
ENTER.
Once the user uses either the ARROW KEYS or the ENCODER to increment or decrement a
temperature, the °C and °F functions of the up and down ARROW KEYS are disabled so that these
two keys function only as ARROW KEYS. Once ENTER has been pressed, the °C and °F functions
are re-enabled.
Encoder (Large Knob)
The ENCODER duplicates the action of the ARROW KEYS (by turning it) and the ENTER key (by
pressing it). Changes made using the ENCODER are made in real time. Also, when creating a file
name in the MEMORY MENU, pressing the ENCODER appends a character to the file name.
OPERATING SCREEN MAIN DISPLAY
About 15–20 seconds after powering on the Model 1140A, the operating screen will appear,
displaying the current status and main settings of the unit.
Control
The number displayed on the operating screen can be changed using the KEYPAD, the
ARROW KEYS, and the ENCODER. When using the ARROW KEYS or the ENCODER, the change at
the binding posts or thermocouple connector is in real time. When using the KEYPAD, ENTER (or
4-3
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