Lake Shore Model 460 Gaussmeter User’s Manual
3-14
Operation
Alarm Set and Alarm On/Off (Continued)
One important point to remember is that the alarm setpoints are absolute (unsigned), i.e., only the
magnitude of the field reading is used. Therefore, once alarm points are specified, any reading, whether
positive or negative, will trigger the alarm.
The following example details operation with the Alarm “
Outside
” setting. For example, if the reading is
to be centered on 1 kG, with the high alarm point at 1.5 kG and the low alarm point at 0.5 kG, the
following diagram illustrates when the alarm would be on or off.
To enter this alarm setup, push the
Alarm Set
key. The user is first asked to enter the High Alarm Point
as follows:
Hi g h Al a r m Po i n t
+1 . 5 0 0 0 k G
Se t t i n g Ch a n n e l X
The initial range displayed is the same as the latest probe range. To set an alarm in a different range,
push the
Select Range
key until the proper range is displayed. Then use the numeric keypad to enter
the high alarm point. After entering the desired high alarm point, press
Enter
to accept the new value or
Escape
to retain the old value. The display proceeds to the Low Alarm Point as follows:
L o w Al a r m Po i n t
+0 . 5 0 0 0 k G
Se t t i n g Ch a n n e l X
The initial range displayed is the same as the latest probe range. To set an alarm in a different range,
push the
Select Range
key until the proper range is displayed. Then use the numeric keypad to enter
the low alarm point. After entering the desired alarm point, press
Enter
to accept the new value or
Escape
to retain the old value. Remember, the alarm setpoints are absolute (unsigned) i.e., only the
magnitude of the field reading is used.
Once the proper high and low alarm points are entered, press the
Alarm On/Off
key to activate the
alarm. The message “Alarm On” briefly appears on the lower line of the display the musical note will
turn on steady in the upper right-hand corner of the display, signifying alarm on. To turn the alarm off,
again press the
Alarm On/Off
key. The message “Alarm Off” briefly appears. When an alarm condition
exists, i.e., the field reading is outside the alarm setpoints, the musical note will flash and, if turned on,
the audible alarm will sound.
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