ELECTRONIC PRINCIPLES - OD1647 - LESSON 1/TASK 3
(d) MAIN TRIGGERING Switches. Alternateaction
switches/indicators.
1 MODE Switches. Provides for the selection of the main
triggering mode and indicates the selection.
a AUTO. When pressed, the sweep is initiated by the
applied trigger signal at the point selected by the LEVEL and
SLOPE controls, if the trigger signal repetition rate is above
30 Hertz and within the range selected by the COUPLING switch.
The triggered sweep can be obtained only over the amplitude
range of the applied trigger signal. When the LEVEL, control]
is set outside the amplitude range, the [.rigger repetition rate
is outside the frequency range selected by the COUPLING switch,
or the trigger signal is inadequate, and no trace is displayed.
b NORM. When pressed, the sweep is initiated by the
amplified trigger signal at the point selected by the LEVEL, and
SLOPE controls over the frequency range selected by the COUPLING
switch. When the LEVEL control is set outside the amplitude
range, the trigger repetition rate is outside the frequency
range selected by the COUPLING switch, or the trigger signal is
inadequate, and no trace is displayed.
c SINGLE SWP. When pressed, further sweeps cannot be
displayed after one sweep until the RESET switch is pressed.
The display is triggered as for NORM operation using the main
triggering controls.
d RESETREADY. When pressed while in the single sweep
mode, one sweep is displayed at the next occurrence of the
trigger pulse (if triggering settings are correct). The
indicator lights and remains lighted until the trigger is
received, indicating that the unit is reset. After trigger
receipt and sweep display, the indicator extinguishes.
2 AMPLIFIER COUPLING Switches. Provides for the selection
of the main triggering coupling.
a AC. When pressed, the dc components of the signals are
rejected and ac signals below approximately 30 Hertz are
attenuated. AC signals
143
Previous Page
