performing a shunt cal on a SCXI-1520 while task is running

[Phillip_Neir]

The application I am working on acquires data from analog, strain, and counter channels. After the acquisition task has started, the customer would like to have the capability to check the shunt cal values of the bridge inputs. Under normal circumstances, the property node "AI.Bridge.ShuntCal.Enable" will not function on a running task. It is undesirable to stop and re-start the task every time the user wants to check a shunt cal value. Is there any way to check a shunt cal 'on-the-fly'?

[Jordan_D]

Hi Phillip,

Unfortunately, checking the shunt calibration on the fly is not possible. You will be required to stop and start your task in order to check the calibration values. What type of application are you running and how frequently do you want to check the calibration values?

[Phillip_Neir]

Hi Jordan,

In most cases the shunt calibration would be performed just prior to test start. That is, the I/O channels have been configured, the data file is open and ready to receive data, the I/O tasks have been started, and all the operator has to do is press the start button. At this point, it is desirable to trim offsets and verify that the channel is operating and is scaled properly. It has been a practice here to record shunt cals on bridge type devices, both at the beginning and end of test. So the shunt cal is used as part of formal data acquisition, but also as a quick check for the operator that can be performed at any point and any number of times. You know, the 1520 is a good bridge device. It has some good features. I was even able to write an on-the-fly autobalance VI. Not being able to do a shunt cal on-the-fly is a disappointment. Is there any plan to change the driver?

[Jordan_D]

Hi Phillip,

If this is a feature that you are interested in seeing in our products, I recommend that you submit a product suggestion at our Product Suggestion Center. Though I cannot guarantee that your suggestion will be implemented, I can tell you that these entries are taken very seriously.