TM 5-3895-374-24-1
Average Shift Value 3 (Parameter 43) - factory set at 1000 counts.
This parameter should be set for approximately 2 times the value set for
Average Shift 2.
Average Register Size (Parameter 44) - factory set at 1 (10)
In the previous examples the averaging register has been shown as
containing 10 readings. The size can be changed for certain applications by
changing this parameter.
Parameter 44:
1 = 10 shifts
2 = 20 shifts
5 = 50 shifts
10 = 100 shifts
Changing the size of the averaging register will affect the speed of the
averaging system when a single register is being loaded -i.e.. when the
change in raw counts is between Average Shift Value 1 and Average Shift
Value 2. For example. if the scale is subject to repeated small vibrations,
their effect can be filtered out by increasing the size of the register and
perhaps slightly increasing the value for Average Shift 1. This should result in
a more stable weight display.
If the register size is met too large there may however be an unacceptably
long delay in the indicator's response to a small change in weight. Use trial
and error to find the optimum settings.
Hold off Delay 1 and 2 (Parameters 45, 46)
The Hold Off Delay feature 1s designed to delay the start of the
averaging system so that the indicator display will read the target weight
sooner.
Without any Hold Off Delay, the averaging system (loading one
register per cycle) is engaged when the rate of change of the internal raw
counts falls below 500 (Average Shift 2). This would then require 10 or more
cycles for the average to finally represent the correct weight (as in the
example illustrated for Average Shift 2). Thus it would require 2 or more
seconds for the display to read correctly after the weight had been applied.
The Hold Off delays the averaging system for a specified number of cycles.
speeding up the response of the scale display.
Hold off Delay 1 holds the indicator in full update (load all registers) for a
specified number of cycles.
Hold off delay 2 holds the indicator in 1/2 update (load 1/2 of all registers) for
a specified number of cycles.
The following example will illustrate the effect of the Hold Off delay:
Note :
:
In the following example:
:
Hold Off delays 1 and 2 set to 3 cycles.
:
Average Shift Values 1, 2 and 3 set to 3, 500 and 1000 counts.
:
Indicator initially stable at 10,000 counts, then a weight representing
5100 counts is applied.
Internal
Update without
Update with
Cycle# Counts Change Hold Off Avg. Hold off Delay Avg.
1
10000
0
None
10000
None
10000
2
15000
5,000
Load All
15000
Load All
15000
3
15050
50
Load 1
15005
Load All
15050?Hold
4
15100
50
Load 1
15015
Load All
15100
off
5
15101
1
Load 1
15025
Load All
15101?Delay 1
6
15100
1
Load 1
15035
Load 1/2
15101?Hold
7
15102
2
Load 1
15045
Load 1/2
15101
off
8
15103
1
Load 1
15055
Load 1/2
15102?Delay 2
9
15101
2
Load 1
15065
None
15102
10
15102
1
Load 1
15075
None
15102
11
15103
1
Load 1
15085
None
15102
In the above example' without a hold off delay, the average reading has still
not reached the correct value after 10 cycles (2 seconds). with a hold delay
the average reading approximates the correct value within 5 cycles. In
summary, the greater the number of hold off delay cycles. The faster the
indicator display reaches the target weight.
(page 3-77)