Cursor Related Analysis

Analysis Methods Available

Every graph in the main display panel comes with a set of analysis methods. The following analysis methods can be applied to actual cursor positions:

• Amplitude: Amp L, Amp R, Increment, Slope
• Min, Max: Min, Max, Peak-Peak, Tmin, Tmax
• RMS: RMS
• Average: Mean, SD, N
• Integral: Integral, Area, Time
• Derivative: Min dA/dt, Max dA/dt, Tmin, Tmax, Slope20+, Tmax20+
• Linear Fit: Slope, Intercept, MSE, r^2
• Median: Median
• BslnCross: Ntotal, Nup, Ndown; Number of times the signal crosses the baseline (or zero)

The Integral-Baseln method is now supported as Integral combined with -Bsln (as of vs. 1.4)!

Analysis results can be saved directly into Microsoft Excel.

Each of the methods will be introduced below. First an introduction to baseline handling.

Baseline

All the above analysis methods may be applied relative to a zero-baseline or relative to a baseline found in the actual signal.

So far only one definition of baseline exist: The mean value of the signal acquired in the pretrig period, i.e. the average of all samples taken before time zero in the sweep (first sample is discarded though).

You choose the baseline method via the control to the right of the analysis method control next to every graph in the data display: "_0_" refers to zero baseline, whereas "-Bsln" refers to the pretrig mean. The measured baseline will be displayed along with other analysis results.

Amplitude

The Amplitude analysis produces the following results:

• Amp L: Signal amplitude at the left cursor position.
• Amp R: Amplitude at the right cursor position.
• Increment: Signal increment from left to right cursor position, ie. the amplitude right minus amplitude left.
• Slope: Increment divided by the time spanned by the two cursors. This is the slope of a straight line drawn through the two cursor/signal crossings.

Amplitude measures, Amp L and Amp R, may be relative to zero or baseline.

Min, Max

The Min, Max (former Min, Max Peak) analysis produces the following results:

• Min: Minimum signal amplitude at and between the cursor positions.
• Max: Maximum signal amplitude at and between the cursor positions.
• Peak-Peak: Max amplitude span at and between the cursor positions, ie. max amplitude minus min amplitude.
• Tmin: The position of the min amplitude in time (x-axis).
• Tmax: The position of the max amplitude in time (x-axis).

Amplitude measures, Min and Max, may be relative to zero or baseline.

RMS

The RMS analysis produces the following results:

• RMS: The RMS (Root-Mean-Square) value of the signal at and between cursors.

The baseline may be subtracted from the signal before the RMS value is calculated.

Average

The Average analysis produces the following results:

• Mean: Mean signal level at and between cursors.
• SD: Standard Deviation of all samples included in the Mean above.
• N: Number of samples included in the Mean above.

The Mean value may be relative to zero or baseline.

Integral

The Integral analysis produces the following results:

• Integral: Signal integrated at and between cursors using the trapezoidal rule.
• Area: Rectified signal integrated at and between cursors using the trapezoidal rule.
• Time: Time span between cursors.

The baseline may be subtracted from the signal before the integral is calculated.

Choosing the non-zero baseline corresponds to the former (and temporary) Integral-Baseln method (vs. 1.12f through 1.13d).

Derivative

The Derivative analysis produces the following results based on the differentiated signal:

• Min dA/dt: Minimum derivative between cursors.
• Max dA/dt: Maximum derivative between cursors.
• Tmin: Position of the minimum derivative in time (x-axis).
• Tmax: Position of the maximum derivative in time (x-axis).
• Slope20+: Max absolute slope measuered as a mean over 20 ms.
• Tmax20+: Position of the Slope20+ in time (x-axis).

These measure are not related to baseline. The measured baseline may still be displayed along with the above results.

Linear Fit

The Linear Fit analysis produces the following results based on the best linear fit of all points (samples) at and between cursors:

• Slope: Slope of the best linear fit.
• Intercept: Amplitude of the best linear fit at time zero (x-axis), ie. its interception with the y-axis.
• MSE: Mean Square Error.
• r^2: Correlation coefficient, r².

Amplitude measure, Intercept, may be relative to zero or baseline.

Median

The Median analysis produces the following results:

• Median: The median value of the signal at and between cursors.

Amplitude measure, Median, may be relative to zero or baseline.