National Instruments Computer-Based Instruments Digital Oscilloscope for PCI NI 5911 Manuel d'utilisateur télécharger pdf (Page 41)

Appendix B Digitizer Basics

NI 5911 User Manual B-6 ni.com

Figure B-5. Waveform Reconstruction with RIS

The time measurement is made with a time-to-digital converter (TDC).

The resolution of the TDC is the number of physical bins to which the TDC

can quantize the trigger arrival time. This resolution should be several

times higher than the maximum desired interpolation factor, which is the

maximum number of logical bins to which you want the trigger arrival time

quantized. The higher resolution ensures that when the TDC output is

requantized to the desired interpolation factor, all output values have a

roughly equal probability of occurrence; that is, all logical bins will contain

approximately the same number of physical bins.

Trigger Level

Sample Times

Input Signal

Frame 1 Frame 2 Frame 3

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 60 61

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National Instruments Computer-Based Instruments Digital Oscilloscope for PCI NI 5911 Manuel d'utilisateur Page 41