Probe tune limits and settings

errors:
"Probe dial value does not match that on the axis"
"Autotune dial number exceeds probe range"
"Dial value exceeds hard limit"

The values of the probe configuration are read from the probe automatically.
The dial values in probe tool are written in the probe file.
If you change these values with console mode, the changed values are written into the probe file.
During or after the installation, the engineer sometimes change the values from the probe sheet from the factory.
These values are used for setting the initial dial values of tuning searching and are different every time after tuning because the tuning condition(dial values) depends on a sample.
The values in Probe Configuration and values are shown in front of the probe should be the same.

Probe tune problems can start from when changing from CDCl3 to some other solvent like acetone. When changing back to CDCl3 it fails to tune and the tune does not reach frequency. When submitting a few times it seems to tune but takes a very long time. The tune then time out and can give the above errors:

First check the cables. Shutdown, disconnect and reconnect the cables. It could be a hardware problem in the probe, in the auto tune unit or slack in the drive cables.
Check that the tune values on the probe have not exceeded the upper limit.
look what limits are set in delta? If it’s more than 5950 in maximum, capacitor inside the probe has possibly broken down due to going over it’s physical limit.

How to tune manually:

1. Remove tuning shafts from the probe.

2.Turn off ATun unit (from the back there should be rocker switch).

3. In delta – choose desire nuclei – now there should be button ‘Manual tune’ in right corner. (Note when ATun unit is on, button says ‘Automatic tune’).

4. When you click on Manual tune, yellow window should pop up with information which nuclei you are tuning and tuning values.

5. On the head amplifier, display should lid on with reflection value, where you can switch it to visualization.

6. Turn knobs for HF tune and HF match (red and blue) – where tuning shafts were connected. Tune should move reflection dip to left and right, match ‘up and down’.

Rotating should be nice and smooth (same as with LF tuning). If its hard, then it is a mechanical issue and probe has to repaired. Also you can try to turn HF tune to its maximum and minimum – see what values it says.