Manual Fluke 190-202-III (page 25 of 98) (English)

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ScopeMeter® Test Tool

How to Use the Test Tool

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 Auto Set Options.

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 ( ) at the

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.

2. Press J to Auto Set (AUTO shows at the top of the screen).

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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Fluke 190-202-III Manual

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