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6120 DAQ Throughput

Hello,
 
          I am using 6120 card to output a FIFO based analog waveform from Ch0 at 1MS/sec. I have stored the 4800 samples (one waveform cycle) in the on board FIFO.  This is a waveform cycling between 0 to 1.6 V. I use the following commands to generate the waveform.
 
WFM_Scale(6120, 0, 4800, 1#, RaisedWaveFormBuffer(0), ScaledWaveFormBuffer(0))  '''''' Scale the voltage array to binary array""""""""
WFM_Load(6120, 1, RaisedChanVect(0), ScaledWaveFormBuffer(0), 4800, 0, 1)  '''''' Load the binary array in the FIFO""""""""
WFM_ClockRate(6120, 1, 0, -1, 5, 0)  '''''' Set the update clock to 1MHz by using 5MHz base clock w/five iterations """"""""
WFM_Group_Control(6120, 1, 1)  '''''' Start the waveform generation """"""""
 
The expected waveform should be:
 
                    __________  1.6 V
0 V _______|                   |
      |--------- 4.8 ms--------|
 
I expect a rise time of 1us for the 0-1.6 transition. However I see ~3us rise time. Can you please explain why I see this behavior?
 
Thanks,
Madan
 
 
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