190 Series III
Users Manual
20
5. Use the cursor and E to select and accept Variable.
6. Use 4 to exit the menu.
A Var shows at the bottom left of the screen. Select Variable to turn off the cursors and
automatic input ranging.
7. Press
j to increase the sensitivity and k to decrease the sensitivity.
Note
Variable input sensitivity is not available in the Mathematics functions (+ - x and
Spectrum).
Noisy Waveforms
To suppress high frequency noise on waveforms, you can limit the working bandwidth to 10 kHz
or 20 MHz. This function smoothes the displayed waveform. For the same reason, it improves
triggering on the waveform.
To choose the 10 kHz bandwidth on for example input A, do the following:
1. Press A to show the INPUT A key labels.
2. Press 4 to open the INPUT A menu.
3. Use the cursor and E to highlight Bandwidth: and select 10kHz to accept the bandwidth
limitation.
Note
To suppress noise without loss of bandwidth, use the average function or turn off Display
Glitches.
Mathematic Functions +, -, x, XY-mode
You can add (+), subtract (-), or multiply (x) two waveforms. The test tool shows the mathematical
result waveform and the source waveforms. The XY-mode provides a plot with one input on the
vertical axis and the second input on the horizontal axis. The Mathematics functions perform a
point-to-point operation on the involved waveforms.
To use a Mathematics function, do the following:
1. Press
P to show the SCOPE key labels.
2. Open the WAVEFORM OPTIONS menu with 4.
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