15
Filter settings
You can use the filter to improve display stability. This is useful if your signal is unstable. Bigger
time constants give more stability but slower response.
The Time constant of this digital filter is very similar to the time constant of an RC filter where
T=RC . The time constant is the time it takes for the display to reach 63 % of its final reading
value, after a step change on the input.
You will see that if you select a 1 second filter time, it will take several seconds for the meter to
reach its final value.
To give improved response to large step changes, we can momentarily cancel the filter action
with the ‘Filter Jump’ feature
How does the Filter Jump feature work?
First, make a note of the range you
calibrated
your meter over (not the full dynamic range of the
meter, just the the difference between the maximum and minimum display values you set, in
either direct or theoretical calibration) Let’s assume you calibrated the meter for a 250 range.
If you set the filter jump percentage to 25%, any sudden change in input of less than 25% of 250
will be included in the averaging calculation.
However, a jump of greater than 25% will cause the filter to be ignored and the meter will
immediately jump to that new value.
If you set a jump of 0%, filtering will always be overridden (never any filtering)
If you set a jump of 99%, filtering will always be present, so long as the input signal doesn’t jump
more than 99% of the calibrated range.
Fi.0.5
Calibration lockout OFF
Filter time constant
Press both buttons >3 secs
Change with UP/DOWN button. OK=Accept
F.J.10
Calibration lockout OFF
Filter Jump percentage
Press both buttons >3 secs, press OK 1x
Change with UP/DOWN button. OK=Accept
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