Tektronix 7853A, Инструкция по эксплуатации

Страница: 17 / 30

Operating Instructions — 7B53A/7B53AN Operators
Display Modes
Four Display Modes can be selected by appropriate
settings of the Time/Division switches (see Fig. 1-7).
Main Sweep Operation. To select the MAIN SWP Display
Mode (non-delayed sweep) set the TIME/DIV OR DLY
TIME and DLY'D Time/Division switches to the same
sweep rate and press in the DLY'D Time/Division switch.
Calibrated sweep rates in the MAIN SWP Display Mode are
available from 5 s/DIV to 0.05 µs/DIV (5 ns/DIV with X10
magnification). The VARIABLE control (Variable Selector
connector set to Main Variable) can be used to obtain
uncalibrated sweep rates to 12.5 seconds/division. Trig­
gering in the MAIN SWP Display Mode is controlled by the
MAIN TRIGGER controls.
Intensified Sweep Display. To select the INTEN Display
Mode, pull out the DLY'D Time/Division knob and rotate
it to a desired sweep rate faster than the TIME/DIV OR
DLY TIME switch setting. The INTEN Display Mode
provides an intensified portion of the main sweep during
the time the delayed sweep is in operation (see Fig. 1-10A).
The time that the delayed sweep runs is determined by the
DLY'D Time/Division switch. The amount of delay time
between the start of the delaying sweep and the intensified
portion is determined by the TIME/DIV OR DLY TIME
switch and the DELAY TIME MULT dial. Triggering for
the delaying sweep portion of display is controlled by the
MAIN TRIGGERING controls; triggering for the intensified
portion of display is controlled by the DLY'D TRIG
controls.
Delayed Sweep Display. The DLY’D SWP Display Mode
is selected when the DLY'D Time/Division switch is pulled
out, rotated in the INTEN Mode for the desired sweep rate,
and then pushed in. In this mode, the intensified portion of
display, as viewed in the INTEN Display Mode, is displayed
on the CRT at the sweep rate indicated by the DLY'D
Time/Division switch (see Fig. 1-10B). Calibrated sweep
rates in the DLY'D SWP Display Mode are available from .5
s/DIV to 0.05 µs/DIV. Uncalibrated delayed sweep rates to
1.25 seconds/division can be obtained by using the VARI­
ABLE control (Variable Selector connector set to Dly'd
Variable position). Triggering for the DLY'D SWP display is
controlled by the DLY'D TRIG controls.
Mixed Sweep Operation. The MIXED Display Mode is
selected when the DLY'D SWP Display Mode is selected
and the VARIABLE knob is pulled out. In this mode, the
main sweep is displayed on the CRT to a point determined
by the DELAY TIME MULT dial; the remainder of the
sweep is at a rate determined by the delayed sweep.
Triggering for the main sweep portion of display is
controlled by the MAIN TRIGGERING controls; and
triggering for the delayed sweep portion of display is
controlled by the DLY'D TRIG controls. A typical mixed
sweep display is shown in Fig. 1-11.
Delay Time Multiplier
The DELAY TIME MULT dial (functional in the
INTEN, DLY'D SWP, and MIXED Display Modes) provides
0 to 10 times continuous sweep delay. The time that the
main sweep runs before the start of the delayed sweep is
determined by the settings of the TIME/DIV OR DLY
TIME switch and the DELAY TIME MULT dial.
For example, the delay time indicated by the DELAY
TIME MULT dial in Fig. 1-12 is 3.55; this corresponds to
3.55 CRT divisions of main sweep. Thus 3.55 multiplied by
the delaying sweep rate, indicated by the TIME/DIV OR
DLY TIME switch, gives the calibrated delay time before
the start of the delayed sweep.
Fig. 1-11. Typical Mixed Sweep display (DELAY TIME MULT dial
set to 3.55).
1-13