LeCroy ArbStudio Manual page 76

ArbStudio
The selectable functions and their available parameters include:
Type
Sine
Cosine
Triangle
Rectangle
Sawtooth
Increase Ramp
Decrease Ramp
Table 3‐1.Asterisk * indicates the parameter varies based on the modulation type selected.
Two compression algorithms are used for a Segment memory usage optimization. The algorithm used depends
on the linear or non‐linear behavior of the selected function (Type).
The maximum compression factor corresponds to equally separated samples in both cases, with a separation
time equal to the minimum time resolution allowed. Intermediate compression factors can be set by controlling
the amplitude factor (Decimation Factor).
• Decimation Factor ‐ Physically represents a percent value of the signal maximum amplitude and is used
by the compression algorithm differently depending on the linear or nonlinear behavior of the function
selected (Type).
• Linear Compression ‐ The compression algorithm is linear for a signal characterized by a linear time
variation of the signal amplitude (Increase Ramp, Decrease Ramp).
The compressed signal samples are equally spaced and the separation between two successive samples is
given by one of the following conditions (the strictest one applies):
• The maximum time separation between two successive samples must be equal to the minimum
resolution.
• The minimum amplitude gap between two successive samples is given by the percent of the
maximum signal amplitude, set by Decimation Factor. For example, a signal with a maximum
voltage of 10V and a Decimation Factor of 10%, the minimum voltage gap is 1 V.
• Non‐Linear Compression ‐ The compression algorithm for non‐linear functions (Triangle, Rectangle,
Sawtooth, Sine and Cosine) is similar to the previous one, but the compressed signal samples are equally
separated only if the Decimation Factor is such that the former condition is satisfied.
By using a suitable Decimation Factor the algorithm allows compressing the modulating signal using a cluster of
samples directly proportional to the amplitude variation in the time unit.
Therefore, the compression algorithm for non‐linear signals takes into account the relative time variation of the
signal amplitude.
If the Decimation Factor is very small with respect to the waveform duration, the compression algorithm may
not be able to perform the signal compression by using the maximum number of available samples.
In such cases a message asks the user to increase the Decimation Factor.
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Parameters
Cycles, Amplitude*, Phase (°), Offset*
Cycles, Amplitude*, Phase (°), Offset*
Cycles, Amplitude*, Phase (°), Offset*
Cycles, Amplitude*, Phase (°), Offset*, Duty Cycle (%)
Cycles, Amplitude*, Phase (°), Offset*
Amplitude*, Offset*
Amplitude*, Offset*
918221 RevA