Operators Manual Owner manual

Operator's Manual

Function Definition

Ratio For every point in the waveform, the value of Source1 is divided by the value of Source2.

Source1 and Source2 must have the same horizontal units and scale.

Reciprocal For every point in the waveform the inverse is calculated using the formula:

1 / (sample value)

Rescale For every point in the waveform the sample value is multiplied by the specified multiplier and

then add to with the specified adder. See Rescaling and Assigning Units.

Roof Calculates the highest vertical values of a waveform at each horizontal value for a specified

number of sweeps.

Segment Selects one segment from a source waveform to place in a sequence waveform. Used in

Sequence sampling mode.

Sinx/x Performs10 -to-1 interpolation using a Sin(x)/x filter.

Sparse “Thins,” or decimates, an incoming acquisition by dropping sample points at regular intervals.

Sparsing factor specifies the number of points to drop between retained samples (e.g., factor of

4 retains 1 then drops 4). Sparsing offset specifies the point at which to begin applying the

sparsing factor (e.g., offset of 3 begins count on the third sample (3), then drops the number of

samples specified by the sparsing factor (4).

Square For every point in the waveform, the square of the sample value is calculated.

Square Root For every point in the waveform, the square root of the sample value is calculated.

Sum For every point in the waveform, the value of Source1 is added to the value of Source 2.Source1

and Source2 must have the same horizontal units and scale and the same vertical units.

Track Generates a waveform composed of parameter measurements that is time synchronous with the

source waveform. The vertical units are those of the source parameter value and the horizontal

units are seconds. Parameter values are posted at the sampling rate.

Trk Same as Track, with alternate transition types.

Trend Produces a waveform composed of a series of parameter measurements in the order the

measurements were taken. The vertical units are those of the source parameter, the horizontal

unit is measurement number. The trend contains a single value for each measurement. See

View Trend.

Zoom Produces a magnified trace of a selected portion of the input waveform. See Zooming Traces.

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 waveshapes, especially when the sampling rate is 3 to 5 times the

system bandwidth. The instrument also gives you a choice of Cubic interpolation. For each method, you

can select a factor from 2 to 50 points by which to interpolate (upsample).

1. Follow the usual steps to set up a math function, selecting Interpolate from the Filter submenu.

2. Touch the Interpolate tab in the mini setup dialog to the right of the main dialog.

3. Touch inside the Algorithm control and select an interpolation type.

4. Touch inside the Upsample by control (Upsampling is the factor by which sampling is increased) and

enter a value.

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