Get Height from Touch-Off Position of Channels (Seek Z-Bottom Height)

Is there a way to use touch-off with the channels and output the height at which it detected the bottom of the well?

Also, I found a submethod library called ‘Vantage Channel Movement’ that has a ‘Search Z’ function. @EricSindelar_Hamilton , is there any documentation on what this does exactly? Could this be used to essentially have the channels look for the bottom of a well?

I’m trying to think of a creative way to write a validation script that can determine if there has been any teaching drift in the Z-direction which tends to happen between repairs to the instrument sometimes. Thanks!

@NickHealy_Hamilton Is there anyone who can help with this?

Hi @partyparrot ,

I have a function that can return the Z heights that were measured when using a touch off aspiration / dispense. It is currently set up for STAR, but not Vantage. What instrument type do you have?

The Search Z function is used for the PlateStackCounting function in STAR Tools and would not help you with the task that you are trying to do.

We have a Vantage. Would it work on a Vantage?
Could you share that function with me?

Thanks!

Hi @partyparrot ,

The example method which contains the library can be downloaded from the link bellow:

The function will return the Z height that was measured when touch off was used in an aspirate/dispense step. The array will always have the number of index positions per channel but will return 0 if the channel does not have a tip loaded on it.

The method is written in reference to a STAR, but the library was updated to work with both STAR and Vantage.

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Thank you so much!

Out of curiosity, is there something like a touch-off but for X and Y coordinates? Like for a side touch?

Hi @partyparrot ,

There is not. That is not a measured value but instead pulled from the labware definition.

@BrandonBare_Hamilton

just for the sake of curiosity (It never killed anyone, except for a cat) wouldn’t it be possible to use the VM command and then, when er62 is triggered, calculate the height? Like used in several teaching methods? (Veriplate for example?)

The teach method which is sometimes used achives this by going up and down in cardinal directions from a given well and measuring the step los in z. It’s sufficiently precise for finding the center of a well and does not endanger the pipetting head (force in x and y is a big no).