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ADAS1000 Baseline / 24bit to 16bit ?

Question asked by SebastianGR on Feb 5, 2014
Latest reply on Feb 12, 2014 by maithil

I have an EVAL-ADAS1000-SDZ and EVAL-SDP-CB1Z evaluation kit.

I want a 12 lead standard ECG. So I configure the Default Setting in the ADAS1000 software. I set the Data rate to 2 kHz, the Data Format to Vector, CH Config to Differential Input, GAIN to x1.4, 2Msps Low Noise and Low Pass Filter to 40Hz.

 

All baselines of all the leads appears instantly to 0V in the scope of ADAS1K Stream Module ECG (I put 0mV Spacing).

10mV-PP-0mVSpacing.jpg

 

However, when I run the ADAS1K Write to File module, my baseline values are between 1.26V and 1.31V (according to channels).

I put my ECG simulator in a mode that makes a +5 mV R wave and -5mV S wave (10mV peak to peak).

 

                Lead I, Lead II, V1', V2', V3', V4', V5', V6':

 

Raw

Baseline: 8232272, 8545551, 8231152, 8239636, 8237645, 8233441, 8229983, 8232200

R wave: 8264695, 8578038, 8263561, 8272195, 8270078, 8266079, 8262682, 8264923

S wave: 8199902, 8513050, 8198755, 8207203, 8205281, 8200930, 8197432, 8199713

 

Voltages

Baseline: 1.2617562, 1.3097683, 1.2615817, 1,2628819, 1,2768579, 1,2762145, 1,275692, 1.2760247

R wave: 1,2667189, 1,3147471, 1,2665478, 1,2678676, 1,2818282, 1,2812225, 1,280704, 1,2810404

S wave: 1,2567906, 1,3047868, 1,256618, 1,2579077, 1,2718998, 1,2712331, 1,2707038, 1,2710413

 

Can you explain how the baselines are set instantly to 0V in the scope of ADAS1K Stream ECG module?

 

Is the firmware, embedded in the evaluation kit EVAL-SDP-CB1Z,  doing this, or is it the software ADAS1000 ?

 

My ultimate goal is to convert the 24bit data to 16bit data and ensure a conversion range of 10mV.

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