PCI 6035E AI DAQ problem

[happyeveryday]

Hi,

I am using a PCI 6035E to acquire to two AI inputs (channel 0 and 1, RSE configuration). I found there are some interferences between two channels. So I used a function generator to test that.

The function generator produce about 100Hz sine wave with pk-pk +110 ~ -360mV. I connected this sine wave to channel 1 and left all other channels open. The testing program is the sample code "Acq&Graph Voltage-Int Clk.vi". MAX test panel result is also attached. The attachments are in order: channel 1 acquisition; 2/4/8/16 channels acquisition; test panel. I didn't get any signal from single AI1 acquisition. For 2/4/8/16 channels acquisition, the sinve wave were spread into every channels. The test panel can acquire pkpk values correctly but can not recover 100Hz frequency. I tried different sampling freq. and all are same results.

In addition, I have Traditional DAQ in the computer and  the two channel result from traditional DAQ is also attached. It's similar to DAQmx, there are interference signal in AI0.

Is this normal for this old card? Or there are some problems in my settings? Please help me check this!

Thank you very much!

LabVIEW: 8.2

DAQmx: not sure now, I will update later

latest Traditional DAQ

Yi

[happyeveryday]

Sine Wave <-> AI1

open <-> other channles

AI1 acquisition

[happyeveryday]

Sine Wave <-> AI1

open <-> other channles

AI0:1 acquisition

AI0:3 acquisition

AI0:8 acquisition

AI0:15 acquisition

[Dennis_Knutson]

Fuzzy and small pictures but it all looks normal from what I can see, Unconnected channels are expected to show data from the adjacent, connected channels. Do a search for 'ghosting'.

[happyeveryday]

Sine Wave <-> AI1

open <-> other channles

AI1 acquisition

AI0:1 acquisition

AI0:3 acquisition

AI0:8 acquisition

AI0:15 acquisition

MAX Test Panel

Traditional DAQ

[Dennis_Knutson]

So? I just said it's normal to see signal in unconnected channels. Is there something else besides that there?

[happyeveryday]

Thanks!

Why there is no signal acquired in AI1 single channel acquisition?

I read the knowledgebase you provided. but if this is normal, how can I trust the data?

The highest sampling rate of 6035E is 200kHz. I have to use 100kHz at least for two channels.

If I want to minimize the ghosting, I have to use a better card with higher sampling rate, right?

Thanks

[Dennis_Knutson]

To eliminate the ghosting, ground the unconnected channels or don't include them in the channel list. If there is nothing connected, why capture those channels?

I'm not sure why the ai1 is blank. The first channel is ai0. What pin do you physically have connected?

[happyeveryday]

The physically connected pin is AI1

[Dennis_Knutson]

No. The actual pin number - i.e. 1,2,3. And what adapter are you using with the DAQ card to connect your signals.