Fluke 190 Series II - Selecting AC-Coupling; Reversing the Polarity of the Displayed Waveform

Using the Scope and Meter
Acquiring Waveforms
1
25
4
F4
Exit the menu
See also Table 2 in Chapter 8.
Selecting AC-Coupling
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
A
Display the INPUT A key labels.
2
F2
Highlight AC.
Observe that the bottom left of the screen displays the
ac-coupling icon: .
You can define how Auto Set affects this setting, see
Chapter 6 ‘Changing the Auto Set Options’.
Reversing the Polarity of the Displayed
Waveform
To invert, for example the input A waveform, do the
following:
1
A
Display the INPUT A key labels.
2
F4
Open the INPUT A menu.
3
ENTER
Select Inverted and accept
inverted waveform display.
4
F4
Exit the menu.
For example, a negative-going waveform is displayed as
positive-going waveform which may provide a more
meaningful view. An inverted display is identified by an
inversed trace identifier ( ) at the right of the waveform,
and in the status line below the waveform.