Rice Lake 920i Installation Manual V1.05 - Manual (Page 32)

28 920i Installation Manual
MULT 1.0
0.000001–
9999999 Multiplier. Specifies the conversion factor by which the primary units are multiplied by to
obtain the displayed rate of change units.
To calculate the MULT value, use the following equation:
MULT = (SMPRAT / INTERVL) * (seconds_per_ROC_unit) * (ROC/PRIMAR_precision_adjustment)
Where:
• SMPRAT is the value specified for the A/D sample rate on the SCALES menu
• INTERVL is the specified ROC interval
• seconds_per_ROC_unit is an adjustment for the ROC UNITS parameter. If ROC UNITS
is set to SEC, use 1; use 60 for UNITS=MIN, use 3600 for UNITS=HOUR.
• ROC/PRIMAR_precision_adjustment compensates for any difference in the DECPNT
and DSPDIV parameters specified for primary units and ROC units. For example, if the
ROC DECPNT parameter is set to 8888888 (no decimal) and with DSPDIV=1, ROC
precision is 1. If PRIMAR DECPNT is set to 8888880 (null units position) and
DSPDIV=2, PRIMAR precision is 20. (That is, weights will be displayed in increments of
20.) In this example, the precision adjustment would be 1 / 20, or 0.05.
Example: If SMPRAT=120HZ, INTERVL=240, ROC UNITS=MIN, and the precision is
compensated as described above, MULT would be calculated as follows:
MULT = (120 / 240) * 60 * 0.05 = 1.5
To calculate a ROC MULT value based on secondary or tertiary units, multiply the calculated
primary units MULT value by the conversion factor for the alternate units. For example, if a
MULT value of 1.5 is calculated for pounds as the primary unit, calculate the MULT value for
kilogram secondary units by multiplying the original MULT value by 0.453592:
MULT(kg) = 1.5 * 0.453592 = 0.680388
See Section 10.10 on page 101 for information about conversion factors.
UNITS SEC
MIN
HOUR Rate-of-change units.
INTERVL 100
1–65535 Update interval. Specifies the number of A/D updates over which the rate-of-change is
calculated.
REFRESH 1
1–65535 Refresh interval. Specifies the number of A/D updates between rate-of-change samples.
The value specified for this parameter should be an integer not less than 1% and not more
than 50% of the update interval (INTERVL parameter) specified. For example, if the INTERVL
parameter value is 120, the REFRESH specified should be in the range of 2–60.
SCALES Menu, FORMAT Submenu
Parameter Choices Description
Table 3-3. SCALES Menu, FORMAT Submenu Parameters (Continued)