Front-Panel Controls, Connectors, And Indicators; Main Triggering Controls - Tektronix 7B92A Instruction Manual

Operating Instructions-7B92A
To install the 7B92A in a plug-in compartment, push it
in until it fits firmly into the compartment. The front panel
of the 7B92A should be flush with the front panel of the
oscilloscope . Even though the gain of the oscilloscope is
standardized, the sweep calibration of the 7B92A should
be checked when installed . The procedure for checking
the unit is given under Sweep Calibration in the Operating
Checkout procedure in this section .
To remove the 7B92A, pull the release latch (see Fig.
1-2) to disengagethe unit from the oscilloscope, and pull it
out of the plug-in compartment.
partmentandthe7B92AintheBhorizontalcompart- shows the Time/Div Variable and Mainframe Selectors.
meni, the sweep locks up if the 7B92A is in its
Fig. 1-3 shows the front-panel controls, connectors, and
Alternate mode and the Mainframe Horizontal mode
i ndicators.
is Alf. Lock-up can be avoided by changing the
Mainframe Horizontal mode to Chop or B. This
allows both 7B92A sweeps to be displayed.
RELEASE
LATCH
t X52-t
s
Fig. 1-2 . Location of release latch.
MAIN TRIGGERING Controls
LEVEL Control
Selects amplitude point on trigger signal where
sweep triggering occurs
when the MAIN
TRIGGERING MODE AUTO, NORM, or SINGLE
SWEEP switches are pressed. When the MAIN
TRIGGERING MODE HF SYNC switch is pressed,
the LEVEL control adjusts the frequency of the
trigger generator to synchronize with the frequency
(or sub-harmonic) of the triggering signal to provide
a stable display.
SLOPE Control
Permits triggering on the positive or negative slope
of the trigger signal (except in HF SYNC) .
O
TRIG'D Indicator
When lit, indicates that the sweep is triggered and
will produce a display with correct setting of the
POSITION control and the controls on the
associated amplifier plug-in units) and os-
cilloscope .
MODE Switches
Select the desired MAIN TRIGGERING mode .
Selected mode is indicated by lighted pushbutton .
AUTO : Selects a triggered sweep initiated by the
applied trigger signal at a point determined by the
LEVEL control and SLOPE control when the trigger
signal repetition rate is above30 hertz and within the
frequency range selected by the COUPLING
switches . When the LEVEL control is outside the
amplitude range, the trigger repetition rate is outside
the frequency range selected by the COUPLING
switches, or the trigger signal is inadequate, the
sweep free-runs to provide a reference trace.
FRONT-PANEL CONTROLS,
CONNECTORS, AND INDICATORS
HF SYNC : sweep initiated by trigger signals with
repetition rates above 100 megahertz and within the
All controls, connectors, and indicators required forthe
range selected by the COUPLING switch . Stable
operation of the 7B92A, except the Time/Div Variable and
display can be obtained when the LEVEL control
Mainframe Selectors, are located on the front panel . A
adjusts the frequency of the trigger generator to the
brief description of the front-panel controls, connectors,
frequency (or sub-harmonic) of the trigger signal .
and indicators is given here . More detailed information is
When the LEVEL control is adjusted to frequencies
given under General Operating Information . Fig. 1-1
between sub-harmonics, the sweep free-runs.
REV B, JUN 1978