Alnor HM680, Owner'S Manual, Page: 21 / 40

Chapter 4. Main Menu 15
Notes:
The time constant is the sampling period over which the manometer averages measurements.
Example: with the time constant equal to ten (10) seconds, the displayed reading represents the
average of measurements taken over the previous ten (10) seconds.
Increasing the time constant will serve to improve measurement stability, particularly when
measuring systems with fluctuating pressures.
Auto Off
This setting adjusts whether or not the instruments automatic shut-off feature is enabled. The automatic
shut-off feature helps to extend battery life by turning off the instrument if the keypad has been inactive
for a period of thirty (30) minutes. The available settings for the Auto-Off feature are
ON and OFF .
Note:
The automatic shut-off feature is disabled whenever data logging is active.