Pushbutton Switch Logic - Tektronix 7B51 Instruction Manual

Operating Instructions--Type 71351
2. Set the TIME/DIV switch to 1 ms and press the top
TRIGGERING and B DELAY MODE pushbuttons.
3. Set the Vertical unit to display at least two divi-
sions of the signal vertically .
4. Check the CRT display for one complete cycle per
division .
5. If necessary, adjust the SWP CAL adjustment for one
complete cycle per division .
Simplified Operating Instructions
The following information is provided to aid in quickly
obtaining the correct settings for the Type 71351 to present
a display. The operator should be familiar with the com-
plete function and operation of the unit as described in this
section before using this procedure .
Normal Sweep. The following procedure will provide a
stable display for most normal-sweep applications .
1 . Select the TRIGGERING MODE, COUPLING and
SOURCE which fit the requirements of the signal to be
displayed.
2. Turn the LEVEL/SLOPE control to the desired
slope.
3. If the green TRIG'D light is not on, adjust the
LEVEL/SLOPE control throughout the range of the selec-
ted slope until the TRIG'D light comes on . If the light does
not come on at any setting of the LEVEL/SLOPE control,
the trigger signal is inadequate or the COUPLING and
SOURCE switches are set incorrectly .
4. Set the TIME/DIV switch and POSITION control for
a display which remains on the display area horizontally
(VARIABLE control should be in CAL position for cali-
brated sweep rates) .
5. If the display does not start at the correct point on
the waveform, readjust the LEVEL/SLOPE control for the
desired triggering .
Magnified Sweep. A magnified-sweep display can be
obtained as follows after a normal-sweep display is obtained
as given in steps 1-5 above .
1 . Adjust the POSITION control to move the area to be
magnified within the center division of the CRT.
2-6
2. If necessary, change the TIME/DIV switch setting so
the complete area to be magnified is within the center divi-
sion .
3 . Press the X10-MAGNIFIED push-button .
4. Use the fine range of the POSITION control to
establish precise positioning of the magnified display .
Delayed Sweep. The following procedure can be used to
obtain a delayed-sweep display when the Type 71351 is used
in an oscilloscope that has dual time base capabilities and
when used with a companion delayed-sweep unit (B).
Obtain a display as given in steps 1-5 under Normal Sweep.
Then proceed as follows:
1 . Press the B STARTS AFTER DELAY push-button .
2 . Set the indicator oscilloscope horizontal mode to dis-
play the A time base (Type 71351) .
3. Set the time/division switch of the companion
delayed-sweep unit (B) so the intensified zone on the dis-
play is the desired length (intensified zone will be displayed
in delayed form) . If the intensified zone is not visible,
adjust the indicator intensity controls .
4. Adjust the DELAY TIME MULT dial to position the
intensified zone to the portion of the display to be delayed .
5. Set the indicator oscilloscope horizontal mode to dis-
play the B time base (delayed sweep unit).
6. If a delayed sweep with less jitter is desired, press the
Type 71351 B TRIGGERABLE AFTER DELAY push-
button . The triggering controls of the companion delayed-
sweep unit (B) must be set to obtain a stable display. See
the instruction manual for that unit for further informa-
tion .
Pushbutton Switch Logic
The TRIGGERING MODE, COUPLING and SOURCE
switches and the B DELAY MODE switch are arranged in a
sequence which places the most often-used position at the
top of each series of pushbuttons. With this arrangement, a
stable normal-sweep display can usually be obtained by
pressing the top push-buttons ; P-P AUTO, AC, INT and
INDEPENDENT. When an adequate trigger signal is
applied, the unit is triggered as indicated by the illuminated
TRIG'D light at any setting of the LEVEL/SLOPE control .
If the TRIG'D light is not on, either the trigger signal