In SINGLE SWEEP mode, the scope will trigger
one time for each softkey press, subject to the
trigger level setting (triggering always occurs on
the rising portion of the applied waveform).
Messages on the line just above the softkeys
indicate the status of the single sweep. The single
sweep is useful in measuring one-time events,
such as a tone burst at the beginning of a
transmission. Such bursts may be followed by
other modulation which would over-write the
screen if measured in the NORMAL trigger
mode.
Level
Adjust the TUNING knob to select the desired
trigger level. The trigger level is a relative level
setting between the values of 0 and 999 (full
scale) where 0 is the most negative and 999 is the
most positive voltage.
NOTE
To achieve the fastest update rate of the
display a trigger level setting of 500 is
recommended for most applications.
Horiz
Press the desired softkey to select the Horizontal
Sweep rate (20 us to 1 sec/div). Since all ranges
cannot be shown on one screen, press the more
softkey for additional selections.
NOTE
If horizontal sweep rates of greater than 10
msec/div are selected, the update rate will
slow down. A good overall setting for most
applications is 200 usec per division.
Horizontal Position
Adjust the horizontal position through the ( )
cursor field either by using the desired softkey
(MOVE LEFT, MOVE RIGHT) or by using the
rotary TUNING knob.
Vertical Sensitivity
Press the desired softkey to select the Vertical
Sensitivity (AM: 1%, to 50% per division, FM:
100 Hz to 50 kHz per division, dependent on
bandwidth selected). When all ranges cannot be
shown on one screen, press the more softkey for
additional selections.
NOTE
The vertical scales and softkeys for FM devia-
tion will change automatically between wide-
band and narrowband.
Vertical Position
Adjust the vertical position through the
cursor field either by using the desired softkey
(MOVE UP, MOVE DOWN) or by using the
rotary TUNING knob.
Press the expand softkey from any field in the
scope display window to enlarge the display for
more detailed analysis. Use the return softkey to
get back to the normal size display.
NOTE
Scale and positioning adjustments are not
possible for stored waveforms that are
displayed through the use of single sweep or
triggering on single non-periodic signals.
Marker (if equipped)
Select marker operation by moving the cursor to
the "Mrk:" field, then pressing the desired softkey
(V, T, or 1/T). Selection provides two
markers on the Modulation Scope screen (refer to
figure 3-21). Function of the "toggle marker"
softkey and Tuning Knob for positioning of
markers is similar to that described in section
3-7.2.1.
V -
This softkey selection provides markers that are
horizontally located to permit relative readings
along the scope vertical axis. The display
adjacent to the "Mrk:" field shows the relative
vertical deflection between the two marker
positions.
53
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