ECG Lead I configuration

I would like to measure the ECG LEAD I configuration.
I have the following hardware ( recommended by NI engineers)
SCXI 1125 ( it only takes differential inputs since the signals are floating).
SCXI 1305 - BNC conector inputs.
DAQ PCI 6052E
Labview 7.1 ( using DAQmx)
Lead I is generally measured by putting RA and LA signals in positive and negative inputs (respectively) of the differentaial amplifier which is referenced to RL ( which is grounded).
Since they dont have any customised hardware for ECG, I was told that I could do aquire the signals with the 1125 and apply the addition/subtraction in software.
Basically, if I connect the RA to the BNC Signal of one cable and the RL to the BNC GND ( or -input) of the same cable,
I will get measurement RA referenced to RL ( half of Lead I).
Similary put the LA to BNC signal of another cable and the RL to the BNC GND and that will give measuremnt LA referenced to RL ( Other half of Lead I).
Connect these two cables to the channel 0 and channel 1 of the SCXI 1305 and 1125 . Apply gain and filter. and subtract the signals in software to get the LEAD I.
However I am not gettting any signal even closely resembling the ECG and I am really frustrated.
MY hardware filer is 10Khz and gain is automaticlaly adjusted by giving input signal as +-3.5mV.I have applied a software filter of 0.01 - 400hz.
I have never used NI hardware for ECG before and I am really confused especially since the RL is floating and not really grounded or driven.
Any suggestions as to why this is not working would be very very very very appreciated.
I have attached a rough hardware wiring diagram of my system.
If Lead I is not possible then is any of the other 6 limb leads possible
Thanks a ton!
Attachments:
Wiring-forLeadI.BMP ‏274 KB

Hello,
Thank you for contacting National Instruments.
I found your application to be very exciting and your drawing was very helpful. It looks like you are doing everything correct. However, I have noticed one problem with your connections from person to the SCXI-1305. The signals that you are trying to measure are floating. Not only are they floating, but they are extremely low voltages. More than likely, these signals are immersed in noise that is amplified by a gain of 1000 giving you nothing but a noisy signal as a result.
What you will need to do to improve your signal quality is ground your negative inputs, which are both referenced to the right-leg to the chassis ground of your SCXI-1305 terminal block. This is not the easiest task since yo
u have purchased a nice SCXI-1305 terminal block which has BNC connectors.
You can follow the instructions in this Knowledgebase:
http://digital.ni.com/public.nsf/websearch/6783C1F75D83349486256DE5008108A2?OpenDocument
Or you can simply solder a wire from the negative input (RL) to one of the grounded screws attached to the chassis inside the SCXI-1305 terminal block.
Please give this a try, this should improve your signal to noise ratio (SNR) and your signal should appear. You may need to adjust your filter frequency in software, a 100Hz low-pass filter should work fine, but you can test multiple cutoff frequencies to get the best response.
Please let me know what happens. I am interested to help you solve this problem.
Here is a link to the SCXI-1125 and SCXI-1305 User Manuals:
http://digital.ni.com/manuals.nsf/websearch/85C7726245BE7391862567BE0056BAFD?OpenDocument&node=132100_US (page 2-2)
http://digital.ni.com/manuals.nsf/websearch/226874A5F8AB7097862569B30
073B186?OpenDocument&node=132100_US
Regards,
Bill B
Applications Engineer
National Instruments

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