Rice Lake Tracer AV - Manual (Page 42)

38 Tracer AV Installation Manual
6.6.3 Setting the Digital Filter Parameters
Fine-tuning the digital filter parameters greatly improves Tracer AV performance in heavy-vibration
environments. Use the following procedure to determine vibration effects on the scale and optimize the digital
filtering configuration.
1. In setup mode, set all three digital filters (DIGFL1, DIGFL2, DIGFL3) to 1. Set DFTHRH to NONE.
Return the Tracer AV to normal mode.
2. Remove all weight from the scale, then watch the indicator display to determine the magnitude of
vibration effects on the scale. Record the weight below which all but a few readings fall. This value is
used to calculate the DFTHRH parameter value in Step 4.
For example, if a heavy-capacity scale produces vibration-related readings of up to 50 lb, with
occasional spikes to 75 lb, record 50 lb as the threshold weight value.
3. Place the Tracer AV in setup mode and set the digital filters (DIGFLx) to eliminate the vibration effects
on the scale. (Leave DFTHRH set to NONE.) Reconfigure as necessary to find the lowest effective
values for the DIGFLx parameters.
4. With optimum values assigned to the DIGFLx parameters, calculate the DFTHRH parameter value by
converting the weight value recorded in Step 2 to display divisions:
threshold_weight_value / DSPDIV
In the example in Step 2, with a threshold weight value of 50 lb and a display division value of 5lb: 50 /
5lb = 10DD. DFTHRH should be set to 10DD for this example.
5. Finally, set the DFSENS parameter high enough to ignore transient peaks. Longer transients (typically
caused by lower vibration frequencies) will cause more consecutive out-of-band readings, so DFSENS
should be set higher to counter low frequency transients.
Reconfigure as necessary to find the lowest effective value for the DFSENS parameter.