Simultaneous single ended and differential measurements on a USB-6009 device?

[JÞB]

no

[Dennis_Knutson]

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@Jeff Bohrer wrote:

no

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Why no? If you use two different DAQmx Channel functions, you can specify single ended in one and differential with the other.

[JÞB · Accepted solution]

Sorry, I triggered on the "Simultaineous"-  the 6009 does not support simultaneous measurement.  Yes a task with multiple channels can have mixes of single ended and differential channels in a scan chain- but they must be on different inputs.

e.g. AI0 diff and AI1 SE is ok

       AI0 diff and AI4 SE is not since AI4 is reserved for the AI0 negative input.

[Tommy H]

Thank you for the responses, and apologies… “Simultaneous” was perhaps the wrong term to use.  Having both SE and Diff inputs wired to the device during the same test is what I’d hoped to be able to do.  I will however make sure I wire them to the correct terminals!

Thanks again,

Tom

[Seth_B.]

Here's an interesting tidbit:

If you set up the channels individually, you can read either channel of a differential pair as an RSE channel in the same task:

In hardware, it's just a question of where we hook up the multiplexers.

Kudos to John P for showing me this.

[JÞB]

Hum- I stand corrected!

[SLamazon]

Hello

I have USB-6255 DAQ which required external SCB-68 for instrumentation.

I have 8 SCB-68 devices but at a time i can connect only 2 SCB-68 device to USB-6255.

In my application, i need to connect 40 differential analog input channels and 40 single ended analog input to effectively monitor 40 power rails of embedded system (at least 30 power rails)

I am using SCI-Lab script to gather data from the DAQ. So far i have hooked up 8 power rails (i.e.. 8 differential channel + 8 single ended channel) and that is working fine.

From SCB-68 quick reference label, it has 15 analog input channels. In my connection, each power rails it consume 3 channels (i.e.. 2 for differential + 1 for single ended), so i can effectively connect 5 power rails using 1 SCB-68.

All other channels are digital and PFI which are useless for my application.

So even i use 2 SCB-68, i can connect only 10 power rails. I need to hook up other 30 power rails (at least 20 more).

Datasheet of USB-6255 says it is 80 channels  DAQ. So, how should i set DAQ or SCB-68 for all analog input channel. i do not require to connect any digital input.

May i have your support please?

Your kind help will be really appreciated.

SL-Amazon

[SLamazon]

Hello

I have USB-6255 DAQ which required external SCB-68 for instrumentation.

I have 8 SCB-68 devices but at a time i can connect only 2 SCB-68 device to USB-6255.

In my application, i need to connect 40 differential analog input channels and 40 single ended analog input to effectively monitor 40 power rails of embedded system (at least 30 power rails)

I am using SCI-Lab script to gather data from the DAQ. So far i have hooked up 8 power rails (i.e.. 8 differential channel + 8 single ended channel) and that is working fine.

From SCB-68 quick reference label, it has 15 analog input channels. In my connection, each power rails it consume 3 channels (i.e.. 2 for differential + 1 for single ended), so i can effectively connect 5 power rails using 1 SCB-68.

All other channels are digital and PFI which are useless for my application.

So even i use 2 SCB-68, i can connect only 10 power rails. I need to hook up other 30 power rails (at least 20 more).

Datasheet of USB-6255 says it is 80 channels  DAQ. So, how should i set DAQ or SCB-68 for all analog input channel. i do not require to connect any digital input.

May i have your support please?

Your kind help will be really appreciated.

SL-Amazon