Sweep Controls; Delay Time Control; Delayed Triggering Controls; 5. Input/Output Connectors - Tektronix 7B53A Instruction Manual

Operating Instructions-7853A/7853AN Operators
2. Sweep Controls
TIM E/DIV OR DL Y TIM E. Selects the sweep rate of the
main sweep generator (see Fig. 1-7).
DL Y'D Time/Division. Selects the sweep rate of the
delayed sweep generator and selects the MAl N SWP,
INTEN, and DLY'D SWP Display Modes (see Fig. 1-7).
VARIABLE. Provides continuously variable main sweep
rates, continuously variable delayed sweep rates, or variable
main sweep holdoff; depending on the setting of the
Variable Selector multi-pin connector (P140). The VARI-
ABLE control also selects the MIXED Display Mode (see
Fig. 1-3, Fig. 1-7).
SWP CAL. Screwdriver adjustment to match the gain of
the 7 B53A/7B53AN to the ind icator oscilloscope for
calibrated sweep rates.
POSITION. Controls horizontal position of display.
FI N E. Provides precise control of horizontal position
adjustment.
MAG. Pushbutton switch selects X 1 or X 1 0 horizontal
magnification.
3. Delay Time Control
DELAY TIME MUL T. Provides variable sweep delay
between 0.00 and 10.0 times the delay time indicated by
the TIME/DIV OR DLY TIME switch.
4. Delayed Triggering Controls
LEVEL. Selects the RUNS AFTER DLY TIME or
Triggerable After Diy Time Modes, and the amplitude point
at which the delayed sweep is triggered.
SLOPE. Two-position switch permits triggering on the
positive-going or negative-going portion of the delayed
triggering signal.
COUPLING. Two-position switch selects the method of
coupling the triggering signal to the delayed triggering
circuits.
SOURCE. Two-position switch to select the source of
the delayed triggering signal.
1-4
5. Input/Output Connectors
MAIN TRIG IN OR AMP IN. Front-panel BNC connec-
tor serving as an external trigger input for the main
triggering circuit or as an external horizontal input,
depending upon the setting of the TIME/DIV OR DLY
TIME switch and the MAIN TRIGGERING SOURCE
switch.
DL Y'D TR IG IN. Front-panel BNC connector serving as
an external trigger input for the delayed triggering circuits
or as a delayed sweep gate output; depending upon the
DLY'D TRIG SOURCE switch, the position of P613, and
the DISPLAY MODE.
OPERATING CHECKOUT
Introduction
The following procedure checks the basic operation of
the 7B53A/7B53AN. It may also be used for familiarization
with this instrument or as an incoming inspection. This
proced ure is divided into two parts, Sweep Control
Functions, and Main and Delayed Triggering Functions. A
complete operating check of the 7B53A/7B53AN control
functions can be made by perform ing both parts, or each
part may be performed separately.
NOTE
For optimum performance, the 1853A/1853AN
should be installed in an oscilloscope system with
similar frequency and sweep rate capabilities.
Setup Procedure
1. I nstall the 7 B53A/7 B53AN in the right horizontal
compartment of the ind icator oscilloscope.
2. Install a Vertical Amplifier unit in the left vertical
compartment.
3. Turn on the indicator oscilloscope and allow at least
20 minutes warmup.
4. Set the 7B53A/7B53AN controls as follows:
MAIN TRIGGERING
SLOPE
MODE
COUPLING
SOURCE
(+)
AUTO
AC
INT