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