Kenwood CS-1045, Instruction Manual

Page: 16 / 35

LEVEL
* Auto Trigger
When the A TRIG MODE ® selection is in A U T O , the
sweep circuit becomes free-running as long as there is no
trigger signal, permitting a check of GND level. When a trig-
ger signal is present, the trigger point can be determined by
the LEVEL control for observation as in the normal trigger
signal. When the trigger level exceeds the trigger signal,
the trigger circuit also becomes free-running where the
waveform starts running. When the A TRIG MODE is set to
NORM and/or, when the trigger signal is absent or the trig-
gering level exceeds the signal there is no sweep.
* Fix
When the A TRIG MODE © is set to FIX, triggering is
always effected in the center of the waveform, eliminating
the need for adjusting the triggering level. A s shown in Fig.
10-(a) or (b), when the A TRIG MODE is set to NORM and
the triggering level is adjusted to either side of the signal,
the trigger point is deviated as the input signal becomes
small which, in turn, stops the sweep operation. By setting
the A TRIG MODE to FIX, the triggering level is
automatically adjusted to the approximate center of the
waveform and the signal is synchronized regardless of the
position of LEVEL control as shown in Fig. 10-(c).
When the input signal is suddenly changed from a square
waveform to a pulse waveform, the trigger point is shifted
extremely toward the " —" side of the waveform unless
the triggering level is readjusted as shown in Fig. 11-(a).
See Fig 11-(a)-(2). Also, if the trigger point has been set to
the " —" of squarewave (Fig 11-(b)-(1)) and the input
signal is changed to a pluse signal, the trigger point is
deviated and the sweep stops. When this happens, set the
A TRIG MODE to FIX and the triggering is effected in the
approximate center of the waveform, making it possible to
observe a stabilized waveform. (Fig 11-(c))
Fig. 10
input signal changed
into a pulse waveform.
Highest level
(b) When the trigger level is set to
the " — " side of the waveform
(Mode switch set to " N O R M " )
Triggering without
setting level
(c) Mode switch set to " F I X " .
Fig.
11
1 6
* Triggering Level
Trigger point on waveform is adjusted by the LEVEL/PULL
@ control. Fig. 9 shows the relationship between the
SLOPE and LEVEL of the trigger point. Triggering level can
be adjusted as necessary.
SLOPE " - " RANGE
SLOPE " + " RANGE
Fig. 9
" N O R M "
Trigger point
Trigger
point
Trigger
point
" F I X "
@ L E V E L control
Trigger
point
Readjust level
(a) When the trigger level is set
around the center of the waveform.
Trigger point
Sweep stops with no trigger.
Same level as (1)