Shunt Calibrate Multiple Channels in One Task - Error 201398

Having created a task with multiple AI Strain Gage channels (each set with same bridge properties and quarter bridge config.), I recieve an error when passing the task to the "DAQmx Perform Shunt Calibration (Strain).vi"
My VI works fine if only a single channel is contained in the task, but more than one channel causes the error. Do I have to loop through each channel manually?
The "possible reason(s)" varies depending on my approach, but often indicates the AI.Bridge.ShuntCal.GainAdjust being requested is "-Inf"

You can start a new thread even if you have the same issue. What exactly you aregetting and show us the code for better understanding.
The best solution is the one you find it by yourself

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Select multiple channels for one task - control and shift keys don't work

Hi,
Following advice from several other posts, I'm trying to select multiple physical channels from the dropdown list so that I can then use the "unflatten channel string" function later on. It looks like if I hold down either shift or cntrl I should be able to select multiple channels from the list, however, this doesn't work for me. I tried going into the "key navigations" property for the task channel control but it doesn't have any associations listed. Has anyone else come across this and found a fix? I have previously got around this by stating multiple channels with a colon (eg. ai1:3) but this doesn't work for the unflatten function.
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Solved!
Go to Solution.

Thanks for your reply Dennis, I see what you mean, unfortunately that doesn't solve my problem so I'm missing something else. I've attached my VIs. I expected that the output from the unflattenstring block would be an array of either the channel references or the names I had given them, and that therefore the "array size" in the 4th pane would be "9" (equal to the number of channels). Instead the output is a an "unnamed task#(some number)" when I look at it with a probe. Perhaps I'm misunderstanding how the task naming works?
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Analog SW Trigger_v3.vi ‏33 KB
Cont Acq&Graph Voltage-Analog SW Trigger_cfjv3.vi ‏64 KB

Reading multiple channels in one task

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Hi,
Normally the way I acquire sample from more than one channel on a cDAQ system is like this:
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i-
Attachments:
Strain_test.gif ‏14 KB
Strain_test.vi ‏36 KB

I have failed to realize that the offset nulling VI has another input called "skip unsupported channels". This is false by default, but setting it true resolves the problem without changing my structure at all.
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Attachments:
Strain_test2.gif ‏8 KB

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Hi Rao
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Hello,
I recieve the appended error message when attempting to use DAQmx Read in my VI. LabVIEW is telling me that I am attempting to read a single channel when my task is configured for multiple channels. However, as you can see in the task configuration pane, that is not the case! If I attempt to use DAQmx Read to generate a waveform with multiple channels, the VI executes without error but I do not want a 1D waveform array.. Any tips?
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Solved!
Go to Solution.
Attachments:
multi_chan_errr.JPG ‏42 KB
channel_Vin.JPG ‏108 KB

This is exactly why I ALLWAYS hide my DAQ Tasks inside a "Resource Module"
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You can have multiple channels in a single task, but those channels all
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Multiple resources on one task

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Hi J Day,
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Hi Saikey,
In most cases, you are exactly right: you can only use one task for one type of operation (i.e. only one analog input task in the same program). With the USB 6009, you can have multiple digital output tasks running at the same time. I was able to run a digital output program with two different digital output tasks configured for a USB-6009.
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I am using Labview 7.1 and have been trying to capture data from 12 channels simutaneously sampled at 2MS/s each and streaming to disk for up to a minute or more. The hardware I am using is 2 x PXI 6133 S series boards with a MXI4 link to a Pentium D 2.8 Ghz machine with 2Gb ram. I have 2 sata drives set up in a raid 0 configuration which should give me hard disk write speed faster or equal to the MXI-4 transfer speed.
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Attachments:
multidevicesync_analoginput_streamtodisk.vi ‏197 KB

Hi,
i can suggest following
Refer to an example VI called as "High speed data logger.VI" in conjunction with "High Speed data logger reader.vi" in Labview examples. Alhrough the logger might be in Tradiditional Daq format, it can be quite easily converted to Daq Mx format to store data in Binary (I32 format) . I have used this for many of my applications and i have found that the data retrieved does not have any "messups".
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hope this helps
Regards
Dev

Shunt Calibrate Multiple Channels in One Task - Error 201398

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