Delayed Triggering Controls; Front-Panel Inputs - Tektronix 7B92 Instruction Manual

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The alternate sweep switches between generators at the
end of each sweep. The TRACE SEP control is activated
in this Display Mode.
TRACE SEP. When the AL T switch is OUT (AL T
Sweep Display Mode), it serves as a trace separation
control. This control vertically positions the trace (pro-
duced by the delaying sweep generator) up to four divisions
with respect to the trace produced by the delayed sweep
generator.
DELAY TIME MUL T. Provides variable delay of 0 to
9.9 times the basic delay time selected by the TIME/DIV
OR DLY TIME switch.
INTENSITY. Controls the intensity of the delaying
sweep display only, when operating in the I NTEN or AL T
Sweep Display Modes.
SWP CAL. Screwdriver adjustment to set horizontal gain
of unit. The SWP CAL is used to set the basic timing of the
7B92 and to compensate for differences in input sensitivity
when changing oscilloscopes.
o
Delayed Triggering Controls
LEVEL. Control determines delayed sweep mode, de-
layed trigger mode and delayed trigger level.
®
IN-RUNS AFTER DL Y TIME. The delayed sweep
runs immediately following the delay time selected by
TIME/DIV OR DLY TIME switch and the DELAY
TIME MULT dial. Delayed SLOPE,COUPLlNG, SOURCE,
and H F SYNC functions are inoperative.
OUT-DLY'D SWP TRIGGERABLE. When the De-
layed Triggering LEVEL control is pressed and released,
the delayed sweep is triggerable. The Delayed Triggering
LEVEL control can now be rotated to select the
amplitude point on the trigger signal at which the
delayed sweep is triggered, or it can be rotated counter-
clockwise (as marked on the instrument front panel) to
select the HF SYNC Delayed Triggering Mode. In the
OUT-DLY'D SWP TRIGGERABLE mode, the delayed
SLOPE, COUPLING, and SOURCE functions are ac-
tivated.
HF SYNC. The HF SYNC Delayed Triggering Mode
is selected when the Delayed Triggering LEVEL control
is pressed and released to the OUT-DL Y'D SWP TRIG-
GERABLE position and rotated counterclockwise to HF
SYNC, as marked on the instrument front panel. Sweep
is initiated by trigger signals with repetition rates above
Scans by Ou!so",ce-Qptlo1l$ =>
Operating Information-7B92 Service
100 megahertz and within the range selected by the
COUPLING switch. Stable display can be obtained when
the LEVEL control adjusts the frequency of the trigger
generator to the frequency (or subharmonic of the
trigger signal frequency. When the LEVEL control is
adjusted to frequencies between subharmonics, the
sweep free-runs.
SLOPE. Two-position switch to select the portion of the
trigger signal wh ich starts the delayed sweep.
+.
The delayed sweep can be triggered from the
positive slope of the trigger signal.
-. The delayed sweep can be triggered from the
negative slope of the trigger signal.
COUPLING. Two-position switch that determines the
method of coupling the delayed trigger signal to the
delayed trigger circuit.
AC. Rejects DC and attenuates signals below about
30 hertz. Accepts delayed trigger signals from 30 hertz
to 500 megahertz.
DC. Accepts trigger signals from DC to 500 Megahertz.
SOURCE. Two-position switch that selects the source of
the delayed trigger signal.
INT. The delayed trigger signal is obtained from the
vertical amplifier unit by way of the associated oscillo-
scope.
EXT. The delayed trigger signal is obtained from an
external signal applied to the DLY'D TRIG IN con-
nector.
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Front-Panel Inputs
MAIN TRIG IN. When the SOURCE switch for MAIN
TRIGGERING is set to EXT or EXT -;. 10, this connector
serves as an external trigger input for the main triggering
circuit.
DLY'D TRIG IN. When the Delayed Triggering
SOU RCE switch is set to EXT, this connector serves as an
external trigger input for the delayed triggering circuit.
TERM 50 il 1 Mil. Two position switch to select
50 ohm or one megohm input impedance for the MAl N
TRIG IN and DL Y'D TRIG IN connectors.
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