Avery Weigh-Tronix TT-830, Руководство по обслуживанию

Страница: 30 / 50

30
TT-830 Bench Scale Service Manual
To find the best settings for your filter needs, follow the steps listed below.
1. What to Do: Determine the amount of positive and negative force
exerted by the vibration on the scale.
How to Do It: Set Threshld to 0.0, Constant to OFF, and Samples to
Average to 1.0 A-Ds. Return to weigh mode and observe the weight
swings. Record the difference between the highest and lowest displayed
weight values. Add 30 to 50% to this value. This is a good starting value
for the Threshld setting. Do not set your indicator to this value until told
to in step 7.
2. Setting the Average to higher values increases the filtering effect.
What to Do: Set Threshld to 0.0, Constant to OFF and Samples to
Average to 15.0 A-Ds. Check the stability of the scale.
How to Do It: Save changes and exit to normal weight mode. Observe
the Center of Zero light. If it is on all the time your scale is stable within
¼ division. If the Center of Zero light blinks more filtering is required. Go
to step 3.
3. Repeat step 2 but increase the Samples to Average by 15.0 A-Ds. Keep
repeating steps 2 and 3 until the scale is stable or you’ve tried the entire
range of Samples to Average (60 A-Ds). If the scale is still not stable go
to step 4.
4. Setting the Constant to higher values increases the filtering effect.
What to Do: Set Threshld to 0.0, Constant to 1.0 and Samples to
Average to 60 A-Ds. Check the stability of the scale.
How to Do It: Save changes and exit to normal weight mode. Observe
the Center of Zero light. If it is on all the time your scale is stable within
¼ division. If the Center of Zero light blinks more filtering is required. Go
to step 5.
5. Repeat step 4 but increase the Constant by 1.0. Keep repeating steps 4
and 5 until the scale is stable or you’ve tried the entire range of Constant
(10). If the scale is still not stable, decrease your display update rate and
start over at step 1 using the new, slower display rate.
6. After the Constant value is established you may wish to lower the
Samples to Average value to improve display response time.
7. After a final value for Constant and Samples to Average has been set,
enter the Threshld value established in step 1. If this value is too small
your scale will act as if the filtering is off or not working. Increase the
Threshld value until your scale stabilizes.
If the Threshld value is too high your scale will react slowly to weight
changes.
When Harmonizer is properly adjusted the scale will be stable at zero
and will rapidly display a stable test weight value.
Appendix 2: Tips on Using Harmonizer
Do not use Harmonizer with
QDT (Quartzell) bases.
We recommend the following
values as a starting point for
Harmonizer filtering:
Display Update = 10 sec
Ave. = 8 disp. or 48 = A-Ds
Constant = Level 4
Threshold = Zero