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* External Sync
|
|
EXT. TRIG
Trigger signal
(Gate signal}
t
!
1
:
Input signal to
f
amplifier, etc.
!
{
'
t
'
Output signal from
amplifier, etc.
Fig. 8
AC:
HF rev:
Trigger signa! by HF rejection
Fig. 9
(3)
DC:
Permits triggering from dc to over 60 MHz. Couples
dc component of sync trigger signal. Useful for trig-
gering from very
low frequency
signals (below
10 Hz) or ramp waveforms with slow repeating dc.
Setting of coupling switch @).
* Triggering Level
Trigger
point on
waveform
is adjusted
by the
LEVEL/PULL @ control. Fig. 10 shows the relation-
ship between the SLOPE and LEVEL of the trigger
point. Triggering level can be adjusted as necessary.
SLOPE ''~'' RANGE
SLOPE +" RANGE
+
y
LEVEL
Fig. 10
* Auto Trigger
When the TRIG MODE @ selection is in AUTO, the
sweep circuit becomes free-running as long as there
is no trigger signal, permitting a check of GND lev-
el. When a trigger signal is present, the trigger point
can be determined by the LEVEL contro! for obser-
vation as in the normal trigger signal. When the trig-
ger level exceeds the trigger signal, the tigger circuit
also becomes
free-running
where the waveform
starts running. When the TRIG MODE is set to NORM
and/or, when the trigger signal is absent or the trig-
gering level exceeds the signal there is mo sweep.
* Fix
When the TRIG MODE @9 is set to FIX, triggering is
always
effected
in the center of the waveform,
eliminating the need for adjusting the tiggering lev-
el. As shown in Fig. 11-(a) or (b), wher the TRIG
MODE is set to NORM and the triggering Bevel is ad-
justed 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
TRIG MODE to FIX, the triggering levelis automati-
cally adjusted to the approximate centerof the wave-
form and the signal is synchronized regadiless of the
position of LEVEL control as shown inF ig. 11-(c).
When the input signal is suddenly chagged from a
square waveform to a pulse waveforn, the trigger
point is shifted extremely toward the '—" side of
the waveform unless the triggering levelis readjusted
as shown in Fig. 12-(a).
See Fig 12-(a)-(2). Also, if the trigger ptm t has been
set to the ''—'' of squarewave (Fig 12(b>)-(1)) and
the input signal is changed to a pluse sinaal, the trig-
ger point is deviated and the sweep stop.
When this
happens, set the TRIG MODE to FIX anit he trigger-
ing is effected in the approximate centeryf the wave-
form, making it possible to observéa
Stabilized
waveform. (Fig 12-(c))
17
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