Mtb Triggering - Philips PM3055 Service Manual

2-8
CHARACTERISTICS
SPECIFICATION
ADDITIONAL INFORMATION
2.4 TRIGGERING
2.4.1 MTB triggering
Trig. mode
AUTO
(auto free
Bright line
in
Auto free run starts
100 ms
run)
absence
of trigger
s
ignal
(typ.) after no trig. pulse.
Triggered
Switches automatically
to auto
free run if one of the
display
channels
is
grounded.
Single
In
multi-channel mode (alter-
nated) each channel
is
armed
after reset;
if sweep has
already started, sweep
is
not
finished. Not applicable in
peak
to
peak coupling.
Trigger source
Line trigger source always
A, B,
Composite
triggers on main frequency.
(AB), EXT, Line
Line trigger amplitude depends
on line input voltage.
Approx.
6
div.
0
220
VAC input
voltage
.
Trigger coupling
Peak-to-peak
(p-
DC, TVL,
TVF
P)
,
Level range
Peak-to-peak
Related
to
peak-
to-peak
p-p
coupling
is DC rejected.
DC INTERNAL
> (+
or
-
8
div.)
DC
EXTERNAL
>
(+
or -
800 mV)
TVL /TVF Fixed level
Trigger
slope
Trigger sensi-
vity
INTERNAL
+/-
Slope sign in LCD and
+ or
-
if
TVL/F
in chosen
for
positive
or
negative video.
0-10
MHz
<
0,5 div. Trig, coupling
DC.
@
50 MHz
< 1,0 div. Trig,
coupling
DC.
0
100
MHz
EXTERNAL
3,0 div.
Trig, coupling
DC.
0-10
MHz
<
50
mV
Trig, coupling
DC.
0
50
MHz
<
150
mV
Trig, coupling
DC.
0
100
MHz
500
mV
Trig, coupling
DC.
TVL/F INTERNAL
<
0,7 div.
Sync, pulse.
EXTERNAL
< 70
mV
Sync, pulse.