Hi,
Does anyone know the equations for calculating the high, mid, low reference voltage? I have set the reference voltages to 10%, 50% and 90%. I just don't know based on what the digitizer calculates the level. For example 1, the Mid level is calculated as (Vtop+Vbase)*0.5. Should it be (Vtop-Vbase)*0.5? The Hi and low reference calculations also do not add up. I was using a signal generator to generate the signals.
I am using PXI-5224 and niScope.lib verison 3.5.
Example 1
3Mhz Square Wave 3.3VPP
ch0 ch1
Vpp=4.704506 Vpp=4.575151
Vtop=3.304177 Vtop=3.304474
Vbase=-0.003679 Vbase=-0.618361
VHigh=3.304177 VHigh=3.304474
VLow=-0.003679 VLow=-0.001788
VMax=4.011691 VMax=3.956790
VMin=-0.692815 VMin=-0.618361
LowRef =0.327107 V LowRef =-0.226078 V
MidRef =1.650249 V MidRef =1.343056 V
HiRef =2.973391 V HiRef =2.912190 V
RiseTime =7.437264 RiseTime =141.967975
FallTime =7.438606 FallTime =9.800559
Example 2
ch0 ch1
Vpp=4.612737 Vpp=4.580664
Vtop=3.295510 Vtop=3.311956
Vbase=-0.001876 Vbase=-0.016182
VHigh=3.295510 VHigh=3.311956
VLow=-0.001876 VLow=-0.016182
VMax=3.971204 VMax=3.965059
VMin=-0.641533 VMin=-0.615605
LowRef =0.327863 V LowRef =0.316632 V
MidRef =1.646817 V MidRef =1.647887 V
HiRef =2.965772 V HiRef =2.979142 V
RiseTime =7.605729 RiseTime =7.745428
FallTime =7.536156 FallTime =7.708538
Message Edited by kkwong on 04-16-2009 03:56 AM
