User's Manual

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
t
1
t
2
t
1
t
2
t
3
t
3
Frame 1 Frame 2 Frame 3