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Operation
Message Displays
Standby
By default if the Model 1140A is in source mode, 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.
Overload
If the Model 1140A is incapable of supplying the output that is displayed, the word OVERLOAD
will appear in the lower right portion of the main display over the material, either ALLOY or
COPPER. With an overload on either output (binding posts or thermocouple connector), no
matter which one is in use, the OVERLOAD annunciator will light. A sustained overload will not
affect the operation of the Model 1140A once the overload is removed.
Out of Range
If the temperature dialed or keyed in is outside the range of the thermocouple type displayed on
the main display, an annunciator will light to convey that fact. If the user attempts to enter a
voltage that is outside the range of the Model 1140A, no error message will appear, but the
instrument will not accept the input.
Alignment Switch On
If the alignment switch is in the on position when the Model 1140A power switch is pressed, the
following message will appear:
The switch's being "on" does not affect the operation of the unit, and it can be switched "off"
while the instrument power is on. Normally a calibration-void label would cover the access to the
switch, so the every-day user of the instrument will not see this message. For details on the
alignment switch and procedure, see
Battery-related Messages
The following messages will only appear on units that have the optional rechargeable battery.
Charging
This indicator is displayed whenever the battery is charging.
Charged
This indicator is displayed when the battery is fully charged. The user can unplug from ac power
at this time although there will be no harm to the battery if left plugged in. In fact, if left plugged
in charging will continue at a reduced charging current which will further increase the charge
level of the battery. When this trickle charge rate has finished "topping off" the battery, the
charge circuit will cease all charging.
ALIGNMENT SWITCH IS ON
ALL ALIGNMENT FUNCTIONS ENABLED
PRESS ANY KEY TO CONTINUE
Section
X.
4-6
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