9 - 8 IM 4H3B1-01E
9.1.7 How to Select Alarm Hysteresis ON/OFF
The alarm hysteresis is the difference between the levels of alarm occurence and reset.
You can choose between two levels of hysteresis: 0% (=OFF) and approx. 0.5% of the
recording span (=ON) (common for all alarms).
The inititial value is ‘ON’.
SETTING PROCEDURE:
Enter the SET UP Mode by turning ‘ON’ the power while pressing and holding the
ENT-key until the SET UP display appears.
Use the UP/DOWN-keys to select the display ‘SETUP=ALARM’. Press the ENT-key.
Press the ENT-key until the display ‘ALM_HYS=ON’ appears. Select ON or OFF.
After selection, press the ENT-key. The display ‘*ALARM SET*’ will appear.
The alarm hysteresis setting has been completed, but has not been stored yet. You can
now adjust other settings in the SET UP Mode, by using the ESC-key.
Before leaving the SET UP Mode, you have to store your new settings. Press the ESC-
key to return to the ‘SETUP=ALARM’ display and then select the ‘SETUP=END’
display.
Press the ENT-key. Select ‘END=STORE’ to keep your new settings or
‘END=ABORT’ and press the ENT-key. After a few seconds, the Operation Mode will
appear.
NOTE Hysteresis setting is only valid for High and Low alarms. Hysteresis setting for rate-of-
change alarms and difference alarms will be ignored.
Figure 9.5
Alarm setting value
Alarm release
Measured value
Alarm generated
1V
- - Hysteresis (approx. 0.5%)
High Limit Alarm(H)
Alarm release
Measured value
Alarm generated
1V
- - Hysteresis (approx. 0.5%)
Low Limit Alarm(L)
Alarm setting value
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