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Setting Alarms

In the default settings, alarms are disabled. Alarms may be set to indicate both over-maximum and under-minimum conditions.

NOTE: Though alarms may be set to warn the experimenter of an (unlikely) equipment malfunction, a more common use is to monitor threats to living samples. For example, set alarms to sound if the temperature of the auxiliary sensor falls outside a prescribed small range (e.g., 35–39°C).

To set up alarms:

  1. Press Alarm on the front panel (see LakeShore 335 Front Panel Control).
  2. Toggle the arrow buttons as needed to select Input A or Input B.
  3. Press Enter.
  4. Toggle the arrow buttons as needed to select Alarm On or Alarm Off.
  5. Press Enter.
  6. Enter a Low Setpoint.
  7. Press Enter.
  8. Enter a High Setpoint.
  9. Press Enter.
  10. Toggle the arrow buttons as needed to select Latching On or Latching Off. With latching on, the alarm remains on even after its trigger is removed (e.g., after the temperature is reduced from an over-maximum condition). In this state, the Alarm button must be pressed to silence the alarm.
  11. Press Enter.
  12. Enter a numeric dead band value.
NOTE: The dead band is a range of values just less than the maximum trigger point, and duplicated as the same range just greater than the minimum trigger point. A triggered alarm does not deactivate until the control parameter has exited the dead band adjacent the violated extreme.
  1. Press Enter.
  2. Toggle the arrow buttons to select Audible On or Off.
  3. Press Enter.
  4. Toggle the arrow buttons as needed to select Visible On or Visible Off.
  5. Press Enter.

 

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