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ScopeMeter® Test Tool
How to Use the Test Tool
21
3. Use the cursor and E to:
a. Highlight Waveform:
b. Select Mathematics... to open the Mathematics.
c. Select Function: +, -, x or XY-mode.
d. Select the first waveform: Source 1: A, B, C or D.
4. Select the second waveform: Source 2: A, B, C or D.
The mathematical function key labels show on the display.
5. Press:
a. 2 - h i to select a scale factor to fit the result waveform onto the display.
b. 3 - h i to move the result waveform up or down.
c. 4 - Toggle the result waveform between on or off.
The sensitivity range of the mathematical result is equal to the sensitivity range of the least
sensitive input divided by the scale factor.
Mathematic Function Spectrum (FFT)
The Spectrum function shows the spectral content of the input A, B, C or D waveform in the input
waveform color. It performs an FFT (Fast Fourier Transform) to transform the amplitude
waveform from the time domain into the frequency domain. To reduce the effect of side-lobes
(leakage) it is recommended to use Auto windowing. This will automatically adapt the part of the
waveform that is analyzed to a complete number of cycles. Selecting Hanning, Hamming or no
windowing results in a faster update, but also in more leakage. Ensure that the entire waveform
amplitude remains on the screen.
To use the Spectrum function, do the following:
1. Press P to show the SCOPE key labels.
2. Open the WAVEFORM OPTIONS menu with 4.
3. Use the cursor and E to:
a. Highlight Waveform:
b. Select Mathematics... to open the Mathematics.
c. Select Function: Spectrum.
d. Select Window: Auto (automatic windowing), Hanning, Hamming, or None (no
windowing).
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