Teledyne LeCroy WaveMaster 8 Zi_Zi-A - Manual (Page 67)

Getting Started Manual
922133-00 Rev A 59
Note: The Cable De-Embedding checkbox is only available if you
have the option. Learn more about this software option and Contact
Teledyne LeCroy for Support.

Interpolation - Linear interpolation, which inserts a straight line
between sample points, is best used to reconstruct straight-edged
signals such as square waves. (Sinx)/x interpolation, on the other
hand, is suitable for reconstructing curved or irregular wave shapes,
especially when the sample rate is 3 to 5 times the system
bandwidth.

Noise Filter - Enhanced Resolution (ERES) filtering increases vertical
resolution, allowing you to distinguish closely spaced voltage levels.
The tradeoff is reduced bandwidth. The functioning of the
instrument's ERES is similar to smoothing the signal with a simple,
moving-average filter. Use ERES on single-shot waveforms, or where
the data record is slowly repetitive (when you cannot use averaging).
Use it to reduce noise when your signal is noticeably noisy, but you
do not need to perform noise measurements. It also may be used
when performing high-precision voltage measurements: zooming
with high vertical gain, for example.
Response Optimization Modes
Frequency response and group delay of the oscilloscope contributes to the
pulse response characteristics of the oscilloscope. By slightly adjusting
these characteristics using digital signal processing, the characteristic
response of the oscilloscope can be optimized for your specific application.
Frequency response is defined as the decrease in the magnitude response
with respect to frequency. A fourth-order Bessel roll-off slightly attenuates
the frequencies near the bandwidth rating of the oscilloscope while a brick-
wall frequency response passes slightly higher frequency content.
Group delay is defined as the rate of change of the total phase shift with
respect to angular frequency through a device or transmission medium.
Amplifiers in analog oscilloscopes typically have some group delay at the
highest frequencies. This inherent group delay minimizes the preshoot
present on a step response and provides the traditional pulse response
with no preshoot before the step. When zero group delay is provided at all
frequencies, preshoot and overshoot is equalized.