Omega HOS-MS420, User Manual, Page: 27 / 110

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V5.1 ‐ March 2010
After a reset, the Oscilloscope is dc-coupled so that ac and dc voltages appear on the
screen. Use ac-coupling to observe a small ac signal that rides on a dc signal. To select
ac-coupling, perform the following steps:
1. Press the MENU key; the function menu will appear at the right side of the
screen.
2. Press MENU ▲ or MENU ▼ to select the CH1 Setting . Four (4) selectable
options appear at the bottom of the screen.
3. Press the F1 key and select AC . The AC coupling icon will appear on the
screen.
Refer to Figure 16.
Figure 16: AC-Coupling
R
EVERSING THE
P
OLARITY OF THE
D
ISPLAYED
W
AVEFORM
To invert the input CH1 waveform, perform the following steps:
1. Press the MENU key; the function menu will appear at the right side of the
screen.
2. Press MENU ▲ or MENU ▼ to select CH1 setting. Four (4) selectable options
will appear at the bottom of the screen.
3. Press the F4 key to select Inverted. The CH1 inverted waveform will then be
displayed on the screen.
Refer to Figure 17.