Chapter II
18
30 MHz
oscilloscope
4.5.
Trigger
(17) (21) SOURCE - Trigger source
Selection by pressing on the
key (17) or
(21):
The indicator corresponding to the selected source is lit.
Synchronization by channel CH1.
CH1
CH2
ALT
LINE
EXT
Synchronization by channel CH2.
CH1
CH2
ALT
LINE
EXT
Trigger source defined according to the display mode
CH1
CH2
ALT
LINE
EXT
Display mode:
Trigger channel:
CH1 mode
CH1
CH2 mode
CH2
ALT mode
Channel 1 synchronized with CH1
Channel 2 synchronized with CH2
CHOP mode
same as ALT mode, since this mode is
forced.
ADD (light On)
CH1
-CH2 (light On)
CH2
Synchronization by the mains power supply frequency.
CH1
CH2
ALT
LINE
EXT
The coupling control is disabled. The phase may be adjusted
using the LEVEL control (13).
Synchronization by the external source connected to the BNC
CH1
CH2
ALT
LINE
EXT
plug (19).
(16)
Automatic trigger of the timebase.
Traces visible even if there is no trigger event.
(13)
LEVEL
Trigger level adjustment potentiometer.
The TRIG light is on when a trigger event is detected (timebase
activated).
(14)
Trigger slope
Light On: trigger on rising slope
Light Off: trigger on falling slope
(18) (20) COUPLING - Coupling of the trigger source
Select by pressing on the
(18) or
(20) key:
The indicator corresponding to the selected source is lit.
DC coupling (0 to 40 MHz).
DC
AC
LFR HFR TVH
TVV
AC coupling (10 Hz to 40 MHz).
DC
AC
LFR HFR TVH
TVV
Rejection of source signal frequencies < 10 kHz
DC
AC
LFR HFR TVH
TVV
(facilitates observation of signals with an undesirable 50 Hz
low frequency component, etc.).
Rejection of source signal frequencies > 10 kHz
DC
AC
LFR HFR TVH
TVV
(facilitates observation of signals with high frequency noise).
Trigger on TV line synchronization pulse.
DC
AC
LFR HFR TVH
TVV
Sweep speed recommended for examination of a TV line:
0.5 µs to 20 µs/div.
Trigger on TV frame synchronization pulse.
DC
AC
LFR HFR TVH
TVV
Sweep speed recommended for examination of a TV frame:
50 µs to 200 µs/div.
AUTO
