30 MHz-differential oscilloscope
13
3.4. Timebase
(20) T/DIV - Sweep coefficient selection : 18 positions (0.5 µs to 200 ms/div.)
(17) VAR - Continuous adjustment of the sweep coefficient of timebase
When the knob is locked in the left-hand position, the UNCAL indicator is out.
(13) HOLDOFF - Continuous adjustment of the minimum time between two
successive sweeps. This control enables the holdoff of ill-timed triggering
(multiple trigger conditions in the same period of the signal observed).
In normal use the knob is locked in the left-hand position (click).
(16) x10 - Horizontal magnitude (x10).
This function is not active in XY mode (indicator out).
3.5. Trigger
(21) - (22) SOURCE - Select by pressing on the (22) or (21) keys:
Synchronisation by CH1.
CH1 CH2 ALT LINE EXT
Synchronisation by CH1.
CH1 CH2 ALT LINE EXT
Trigger source defined according to the display mode:
CH1 CH2 ALT LINE EXT
Display mode Trigger channel
CH1 CH1
CH2 CH2
ALT channel 1 synchronised with CH1
channel 2 synchronised with CH2
CHOP CH1
ADD CH1
Synchronisation by the frequency of the mains supply. The
CH1 CH2 ALT LINE EXT
trigger point can be adjusted using the LEVEL control.
trigger source coupling command is inoperative (LEDs
coupling source off).
Synchronisation by the external source connected to the plugs
CH1 CH2 ALT LINE EXT
EXT- (26) and/or EXT+ (25) BNC's.
(19) AUTO - Automatic trigger of the timebase. Traces visible even in the absence of
a trigger event.
(15) LEVEL - Adjustment of the trigger level
The TRIG indicator lights up when a trigger event is detected.
(18) Trigger edge (∗)
Indicator lights up : trigger on the negative slope.
Indicator off: trigger on the positive slope.
This function is not active in XY mode (indicator out).
(*) NB : When one of the TVH or TVV filters is activated, it is possible to
trigger in positive video with a positive trigger slope or in negative
video, with a negative trigger slope.
(Refer to figure 4, next page).
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