E4990A Help
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Referring to traces in a different channel is NOT
available with Equation Editor on the E4990A.
The equation can be entered with the software
keyboard enabled by selecting Keyboard... (3 and 3a in the figure
above).
3. Follow the steps below to apply the defined equation. When a valid
equation is entered, the Equation Enabled check box becomes
available for checking.
1. Check Equation Enabled (√) check box (2a in the figure above).
2. Click Apply. The equation becomes visible and annotation of
[Equ] (2b in the figure above) is displayed in the trace title area.
3. Click Close to hide the dialog box.
The equation can also be applied by selecting Display
> Equation [ON] (2 in the figure above).
If error correction is not turned ON, then the raw,
uncorrected data is used in the equation trace.
As for E4990A, an equation is always valid.
The data trace of measured channel is always measured in E4990A.
The equation might be invalid when referring to a memory trace and
the memory trace isn't displayed.
Equation Editor Examples
The following examples may help you in getting started with Equation
Editor. Input the equation example in the equation field (4 in
Equation
Editor dialog box).
Description Parameter Equation Example
Add 50 Ω offset on Trace 1 Z
Offset=data(1)+50
See the internal data processing for equation editor data processing
position.
Equation History
Equation Editor has the capability to save and recall all previously defined
equations. All equations can be viewed in the Equation History dialog box.
To view the equations in the list, follow this procedure:
1. Open Equation Editor by Display > Equation Editor.
2. Enter an equation and click Apply in the Equation Editor Dialog box
to save the defined equation in the directory of the E4990A. To view
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