Digital Filter; Analog Output Calibration - Rice Lake 880 Technical And Service Manual

9.10.2 Digital Filter:

The digital filter is an adaptive filter that has two parameters to set the filter settling and response times: sensitivity
and threshold.
With the digital zero threshold set at zero, determine the amount of instability that is present. Convert this
instability to display division. The number of display division of instability will be used to set the threshold of the
digital filter. The digital filter can be set to
Digital Filtering Sensitivity
Digital filtering sensitivity (
can be set to heavy, medium, or light. A heavy setting will result in an output that is more stable and will settle
more quickly than that of a light. However, small changes in weight data (a few grads) on the scale base will not be
seen as quickly.
If the difference in typical subsequent weight values on your scale will be only a few grads, use a light setting. If
using a truck scale where the changes in subsequent weight values will be 100s of grads, a heavy setting will be
more appropriate.
Digital Filtering Threshold
Digital filtering threshold (
can be set in the range of 0 to 999999 display divisions. When a new sampled weight value is acquired, the
adaptive filter compares the new value to the previous (filtered) output value. If the difference between the new
value and the previous output value is greater than the
output is reset. The newly acquired sample value replaces the filtered output. If the difference between the new
value and the previous output value is less than the
a weighted average. The weighed average is based on the amount of the difference, time the system has been
stable, and selected
DFSENS

9.11 Analog Output Calibration

See Section 3.0, Table 3-14 for ANALOG OUTPUT parameters.
The following calibration procedure requires a multi meter to measure voltage or current output from the analog
output module. If the option is not already installed, see Section 2.5 on page 15.
The analog output must be calibrated after the indicator itself has been configured (Section 3.0) and calibrated
Note
(Section 4.0).
1. Enter setup mode and go to the ALGOUT menu (see Figure 3-21):
• Set MODE to 0% for 0–10 V output, 20% for 4–20 mA output
• Set MIN to lowest weight value to be tracked by the analog output
• Set MAX to highest weight value to be tracked by the analog output
2. Connect multimeter to connector J1 on the analog output board:
• For voltage output, connect voltmeter leads to pins 3 and 4 (-V, +V)
• For current output, connect ammeter leads to pins 1 and 2 (-mA, +mA)
3. Adjust zero calibration:
• Scroll to the TWZERO parameter.
• Press , 000000 will display
• Check voltage or current reading on multimeter.
• Set the parameter to match the reading from the multimeter.
• Press or
• Press or
TARE
• Press
• Press or
TARE
• Press
92 880 Installation Manual
by entering 0 in the
OFF
) controls the stability and settling time of the scale. The sensitivity parameter
DFSENS
) should be set for the amount of observed noise in the system. This parameter
DFTHRH
value.
to select the digit.
to increment or decrement the value.
to move to the decimal point entry.
to adjust the decimal point placement.
to accept the displayed value.
DFTHRH
parameter (displayed division) the adaptive filter
DFTHRH
DFTHRH parameter, the two values are averaged together using
parameter.