TSI Instruments HM685, Owner'S Manual

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6-4 Hydronic Manometer Model HM685
T e m p e r a t u r e
Temperature readings can display in °C or °F.

At the Select Units menu, highlight Temperature and press the Enter
key to select the desired setting.
T i m e C o n s t a n t
The current value of the time constant is adjustable. Available settings
include 1, 5, 10, 20, and 30 seconds.
Notes:

The time constant is the 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.