🤚 You should only perform a span calibration:
if you are using third-party load bars (not Tru-Test load bars), you have set up the indicator weighing settings as recommended, but the scale is still not weighing as expected.
as part of advanced troubleshooting if all other options have been exhausted.
To perform a span calibration, you will need:
a test weight - this must be a known weight which is at least 1/3 of the scale capacity OR similar to what you are typically weighing (e.g. the approximate weight of an animal. This could be bags of feed or drums of liquid).
to know the maximum scale capacity (capacity of the load bars or load cell)
To perform a span calibration:
Turn on the indicator and ensure that the load bar or load cell connectors are secure.
Hold down ESC and press MENU.
The Span Calibration menu will be displayed:
Press ENTER.
The Capacity field will be displayed:
Enter the Scale Capacity. This should be the maximum capacity rating for the load bars or load cell minus the weight of the platform, crate, crush or chute.
Press V.
The Cell Resolution field will be displayed:
Enter the Cell Resolution. This will depend on the scale capacity:
Scale capacity | 1000 kg | 2000 kg | 5000 kg | 10,000 kg |
Recommended resolution | 0.5 to 2.0 kg | 1.0 to 5.0 kg | 1 to 10 kg | 5 to 10 kg |
💡 The coarser the resolution, the faster the scale will stabilise the weight.
7. Press V.
The Test Weight field will be displayed:
8. Type the weight of the Test Weight e.g. 2000 kg.
9. Press V.
A message will be displayed:
10. Make sure there is nothing on the platform then press ENTER.
A message will be displayed:
Then after a few seconds:
11. Place the test weight on the platform and press ENTER.
A message will be displayed:
Then after a few seconds, if the span calibration has been successful:
💡 If any errors are displayed, check the resolution, capacity and test weight details are correct and repeat from Step 1.
Depending on the load bars attached, the Fine Resolution Valid field may be displayed:
We recommend setting Fine Resolution to Off. Fine Resolution allows you to set the Resolution two steps below the normal resolution for the load bars. The only situation you might need it is if you are using high capacity scales to weigh something much lighter, requiring much more accuracy (e.g. using cattle scales to weigh fleece).
12. Press V.
The Auto Resolution field will be displayed:
13. Set Auto Resolution to On (recommended) if you want the indicator to switch to a coarser resolution for larger weights.
14. Press V.
The Sensitivity will be displayed. This is a calculated value derived from the span calibration:
15. Press ESC repeatedly to exit the Span Calibration menu.