30 MHz-differential oscilloscope
15
(26) - (25) EXT- EXT+ Input of the external synchronisation signal by the + and -
BNC sockets. (Refer to §. 5. SPECIFICATIONS).
(23) - (24) COUPLING - Coupling of the trigger source
The filtering activated only acts on the trigger channel, not on the display.
This COUPLING function is inactive in XY mode (indicators out).
Select by pressing on the (23) or (24) key:
DC coupling (0 to 40 MHz)
DC AC LF HF TVH
TVV
AC coupling (10 Hz to 40 MHz)
DC AC LF HF TVH
TVV
Rejection of source signal frequencies < 10 kHz
DC AC LF HF TVH
TVV
(facilitates observation of signals with a DC component).
Rejection of source signal frequencies > 10 kHz
DC AC LF HF TVH
TVV
(facilitates the observation of signals with HF-noise).
Trigger on the synchronisation pulse of the TV line
DC AC LF HF TVH
TVV
(∗ NB, page 13).
Sweep coefficient recommended for the examination of a
TV line: 0.5 µs at 20 µs/div.
Trigger on the synchronisation pulse of the TV raster
DC AC LF HF TVH
TVV
(∗ NB, page 13).
Sweep coefficient recommended for the examination of a
TV raster: 1 ms/div.
In TVH and TVV COUPLING, the P-P and LEVEL functions are inactive.
(14) P - P - Peak-to-peak trigger
The trigger reference (accurate adjustment by LEVEL) is automatically between
the low and the high peaks of the sinewave chosen, which guarantees the trigger
irrespective of the amplitude or the DC component of the source signal (80% of
the peak-to-peak amplitude of the sinewave for f = 100 Hz).
This COUPLING function is inactive in XY mode (indicators out). The use of
P-P triggering is not recommended on very low-frequency signals or pulsed
signals of very short duration.
3.6. Trigger delay (DELAY)
This mode permits a portion of the signal to be examined in detail (at high sweep speed)
after the trigger event chosen. The DELAY command (27) enables continuous adjustment
of the delay (1 to 9 div.).
(28) DELAY- Select by pressing successively on key (28) :
Normal mode :
S DLY
The sweep starts immediately (trigger event at the far left of the trace).
SEARCH mode (S) :
S DLY
The plot(s) on the screen present an under-
intensified part (equivalent to the
trigger delay) adjustable using the DELAY potentiometer (27).
DLY delayed mode (DLY mode):
S DLY
The sweep begins at the point corresponding to the end of the under-
intensified zone in SEARCH mode.
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