Promax OD-405, Manual, Page: 181 / 218

USER’S MANUAL. OD-405/410B/411/415
Page 65 11-2011
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5.6.6.3 Coupling Selection
Procedure
1. Press the CH1 or CH2 key.
2. Press Coupling (F1) repeatedly to select the coupling mode.
Range:
DC coupling mode. The whole portion
(AC and DC) of the signal appears on the
display.
Ground coupling mode. The display
shows only the zero voltage level as a
horizontal line. This mode is useful for
measuring the signal amplitude with
respect to the ground level.
AC coupling mode. Only the AC portion
of the signal appears on the display. This
mode is useful for observing AC
waveforms mixed with DC signals.
5.6.6.4 Expand Vertical Scale Center / Ground (OD-411/OD-415)
Normally when the vertical scale is increased, the scaled image is
centered from ground. However a signal with a voltage bias could be
obscured when the vertical scale is increased. The Expand Center function
expands the image from the center of the signal, rather than ground. This
function is only available on the
OD-411/OD-415 .
Expand Ground
Position Indicator
Position Indicator
Figure 22.-