I have a SteadyWeb tension controller
with a digital meter. The meter reads out a steady 133 pounds when tension
is applied and the web is stopped, but when running web it fluctuates rapidly
through a wide range, e.g. 95-133, with the result that I don't see a useful
tension reading. Is my running tension really changing that much
that fast? Should I adjust the SteadyWeb?
It is difficult to be sure what the digital tension meter is reading
if it shows rapid fluctuation. This phenomenon may indeed be caused by
variation in your running tension. To identify whether or not the problem
is from instability in your running tension, connect an analog volt meter
(10 VDC scale) between connection points 42(-) and 44(+) on the terminal
block TB204 of the SteadyWeb Power Board. On the volt meter you can observe
the actual signal variation rather than the amplified “flicker” seen on
the digital meter.
It should be possible to adjust the meter damping to help reduce the
flicker. This is a
process of "averaging" the tension signal over a longer time period.
Regardless, even a
stable tension reading on a digital meter is not truly representative
of the actual tension
signal at any given point in time. Very slight web tension changes
cause continuous signal variation.