TESTO 6448 Instruction Manual page 40

5 Operation
Hysteresis function (marked in grey in the figure)
The hysteresis keeps the switch status of the output stable if the
flow fluctuates around the nominal value.
With increasing flow, the output switches upon reaching the switch
point (SPx).
If the flow decreases again, the output only switches back when the
return switch point (rPx) is reached.
40
If the fourth digit flashes for 3 seconds without
changing, then digit 1 is active when it is > 0.
After 3 seconds
If digit 1 is "0", then the display changes to the next
lowest adjustment range. The decimal point is
moved one space to the left or the LED display
changes.
After 3 seconds
Continue: Change digit 4 or wait for 3 seconds and
set digit 1.
After 3 seconds
If [Set] is pressed down continuously, the display runs
through all ranges and goes back to the start value
when it reaches the end. Release
the setting again.
[Set] briefly and start