Ac-Coupling Selection; Reversing The Polarity Of The Displayed Waveform; Variable Input Sensitivity - Fluke ScopeMeter 190 Series III User Manual

AC-Coupling Selection

After a reset, the test tool is dc-coupled so that ac and dc voltages appear on the screen. Use ac-
coupling when you wish to observe a small ac signal that rides on a dc signal.
To select ac-coupling, do the following:
1. Press A to show the INPUT A key labels.
2. Press 2 to highlight AC.
Observe that the bottom left of the screen shows the ac-coupling icon:
You can define how Auto Set affects this setting, see

Reversing the Polarity of the Displayed Waveform

To invert, for example the input A waveform, 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 select Inverted and accept inverted waveform display.
4. Use 4 to exit the menu.
For example, a negative-going waveform is a positive-going waveform which may provide a more
meaningful view. An inverted display is identified by an inversed waveform identifier (
right of the waveform, and in the status line below the waveform.

Variable Input Sensitivity

The variable input sensitivity allows you to adjust any input sensitivity continuously, for example
to set the amplitude of a reference signal to exactly 6 divisions. The input sensitivity of a range
can be increased up to 2.5 times, for example between 10 mV/div and 4 mV/div in the 10 mV/div
range.
To use the variable input sensitivity on for example input A, do the following:
1. Apply the input signal.
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2. Press
An Auto Set will turn off the variable input sensitivity. You can now select the required input
range. Keep in mind that the sensitivity will increase when you start adjusting the variable
sensitivity (the displayed waveform amplitude will increase).
3. Press A to show the INPUT A key labels.
4. Press 4 to open the INPUT A menu.
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