TM 11-6625-2925-1O/T0 33A1-10-242-1
To remove the 7B92A, pull the release latch (see figure (2) 2-2) SLOPE Switchto
disengage the unit from the oscilloscope, and pull it out Permits of thetriggering on the positive or negative slope of the
plug-in compartment.trigger signal (except in HF SYNC).
(3) TRIG'D Indicator
FRONT-PANEL CONTROLS,When lit, indicates that the sweep is triggered and will
CONNECTORS, AND INDICATORSproduce a display with correct setting of the POSITION
control and the controls on the associated Amplifier plug-
All controls, connectors, and indicators required for thein unit(s) and oscilloscope.
operation of the 7B92A, except the Time/Div Variable and
Mainframe Selectors, are located on the front panel. (4) A MODE Switchesbrief
description of the front panel controls, connectors, andSelect the desired main triggering mode. Selected mode
indicators is given here. More detailed information is is indicated by lighted pushbutton.given
under General Operating Information. figure 21 shows the
Time/Div Variable and Mainframe Selectors. figure 23 showAUTsO: Selects a triggered sweep initiated by the applied
the front panel controls, connectors, and indicators.trigger signal at a point determined by the LEVEL control
and SLOPE switch when the trigger signal repetition rate
Main Triggering Controlsis above 30 hertz and within the frequency range selected
by the COUPLING switches. When the LEVEL control is
(1) LEVEL Controloutside the amplitude range, the trigger repetition rate is
outside the frequency range selected by the COUPLING
Selects amplitude point on trigger signal where swsweepitches, or the trigger signal is inadequate, the sweep
triggering occurs when the Main Triggering Mode AUTOfree-runs to provide a reference trace.,
NORM, or SINGLE SWEEP switches are pressed. When
the Main Triggering Mode HF SYNC switch is pressed, theHF SYNC: Sweep initiated by trigger signals with
LEVEL control adjusts the frequency of the triggerrepetition rates above 100 megahertz and within the range
generator to synchronize with the frequency (orselected by the COUPLING switch. Stable display can be
subharmonic) of the triggering signal to provide a obtained wstablehen the LEVEL control adjusts the frequency of
display.the trigger generator to the frequency (or subharmonic) of
the trigger signal. When the LEVEL control is adjusted to
frequencies between subharmonics, the sweep free-runs.
NORM: Sweep initiated by the applied trigger signal at a
point selected by the LEVEL control and SLOPE switch
over the frequency range selected by the COUPLI NG
switches. Triggered sweep can be obtained only over the
amplitude range of the applied trigger signal. When the
LEVEL control is either outside the amplitude range, the
trigger repetition rate is outside the frequency range
selected by the COUPLING switches, or the trigger signal
is inadequate, there is no trace.
SINGLE SWEEP-RESET: When the SINGLE
SWEEPRESET pushbutton switch is pressed, a single
trace will be presented when the next trigger pulse is
received. The SINGLE SWEEP-RESET pushbutton
remains lit until a trigger is received and the sweep is
completed. The SINGLE SWEEP-RESET pushbutton
switch must be pressed again before another sweep can
be displayed.
(5) COUPLING Switches Select trigger signal coupling.
Selected coupling is indicated by lighted pushbutton.
Figure 2-2. Location of release latch.
2-2REV. B, NOV. 1975 |