Simplified Operating Instructions; Normal Sweep; Magnified Sweep; Delayed Sweep - Tektronix 7B51 Instruction Manual

Operating Instructions-Type 7851
2. Set the TIME/DIV switch to 1 ms and press the top
TRIGGERING and B DELAY MODE push buttons.
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 7B51 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
SOU RCE 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·MAGNI FlED 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 7B51 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 7B51).
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 MUL T 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 7B51 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 push buttons. 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