Tektronix 222 Operator's Manual page 97

More On How It Works-222 DSO O~erators
6.3
STORE AND NONSTORE DISPLAY MODES
In STORE mode, traces will remain displayed between trigger events.
When STORE mode is active, an St symbol is seen in the bottom line
of the readout. The space is blank in NONSTORE mode. (See Figure
3-4 for the location of the readouts.)
In NONSTORE mode traces are held only to the next display update
(about
30
ms). If a trigger has not happened before the update, the
trace is blanked until a new acquisition occurs. However, in AUTO BL
(auto baseline) Trigger MODE, a trigger will be forced if one does not
occur, and the data captured will be displayed.
6.4 VERTICAL INPUT COUPLING
The vertical channel input coupling is controlled from the CLPG menu
called up by pressing a channel SELECTICOUPLING button twice (or
once if the channel is already selected).
DC: Passes all frequency components of the input signal (up to the
vertical bandwidth) to the attenuator of the selected channel. Select
DC input coupling when the complete waveform content (dc
+
ac) is
to be viewed.
AC: Capacitively couples the input signal to the attenuator of the
selected channel; dc is blocked. Select AC input coupling when
viewing most waveforms to reduce the amount of vertical positioning
needed from waveform to waveform.
GND: Disconnects the input signal and grounds the input of the
selected channel. Select GND coupling to set a ground reference
level for dc waveform measurements.
CHI OFF
or
CH2 OFF: Turns off the display of the selected channel.
Select OFF to remove an unused trace from the display. Both active
channels may be turned off to reduce the clutter for viewing saved
waveforms. If a channel is off, "OFF" is displayed in the VOLTSIDIV
readout location for that channel.
NOTE
Changes to the Vertical POSITION, VOLTSIDN, or
Variable VOLTIDIV control setting for
a
selected
REV JUN 1989