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VIVA calculator dnl&inl

Simons

Hi,

I try  expression below. It could not work.

dnl(abs(dac_out_DC) 0.625m  ?mode "auto"  ?crossType "rising" ?delay 0.0 ?method "end" ?units "lsb" ?nbsamples (256/VAR("dac_step")))

but it works when I use dnl(abs(dac_out_DC) 0.625m ?mode "auto" ?crossType "rising" ?delay 0.0 ?method "end" ?units "lsb" ?nbsamples 256).

The difference between these two expression is the "bnsamples" argument. Do you know why?

Thanks

Parents
  • Andrew Beckett

    What happens when you use the first expression in the calculator? What does VAR("dac_step") give if you hit the plot/eval icon in the calculator?

    Andrew.

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  • Andrew Beckett

    What happens when you use the first expression in the calculator? What does VAR("dac_step") give if you hit the plot/eval icon in the calculator?

    Andrew.

Children
  • Simons
    in reply to Andrew Beckett

    Thanks for your response!

    1. when  use the first expression in the calculator, the CIW shows information below:

    expression evaluation failed: dnl(abs(dac_out_DC) 0.000625 ?mode "auto" ?crossType "rising" ?delay 0.0 ?method "end" ?units "lsb" ?nbsamples 256/VAR("dac_step"))
    ("error" 0 t nil ("*Error* drfGetWaveformYVec (DRL-18): argument not a valid srr waveform interface object 2.768375e-05"))

    2. VAR("dac_step") could be evaluated to 1. 

  • Andrew Beckett
    in reply to Simons

    That sounds as if the input waveform isn’t actually a waveform but a single number. Could you contact customer support? I think we’ll need to see your data and setup to properly diagnose the problem. 

    Kind Regards,

    Andrew

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