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6-2E
LEVEL: Determination of the starting point of the time-base can be varied by the LEVEL control. The
time-base starts when the trigger signal reaches the voltage level of the LEVEL control.
Signal
voltage
ae
1
Sawtooth
voltage
1
Screen
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— MATS77
LINE: Main time-base triggering on a signal derived from the mains voltage. Can be used when examining the
mains ripple on the d.c. output voltage of a power supply. Line triggering is not available when the instrument
is operated from a battery supply.
MTBI: Main time-base intensified. The horizontal deflection is supplied by the MTB. One part of the trace,
representing the DTB, is intensified. The length of the intensified part depends on the settings of the DTB
and MTB controls. The intensified part can be shifted along the MTB trace by the DTM control. Can be
used to locate a particular part of the signal.
,
MAT 2143
Example: with a 4 division signal on the screen, the LEVEL control is adjustable from +1,8 div. (CW) to
—1,8 div. (CCW) with a total range of 3,6 div.
SINGLE: The MTB runs only once after receipt of a trigger pulse. Pre-determination of the required trigger
level can be obtained in TRIG VIEW mode. When
ARMED, the time-base is ready on receipt of a trigger
pulse. The RESET softkey resets the time-base so that it can start again on a new trigger pulse. Can be used
to display non-repetitive waveforms.
SLOPE: Determines on which slope the sweep is started. If positive, the time-base starts on the positive-going
slope of the trigger signal. If negative, the time-base starts on the negative-going slope of the trigger signal.
STARTS:
In the MTBI or DTB mode, the delayed time-base generator starts immediately after the selected
delay time, adjusted by the DTM control.
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