Test Setup Chart; General Operating Information; Sweep Calibration Check - Tektronix 7B51 Instruction Manual

Operating Instructions-Type 7B51
EXT TRIG IN
Sweep Controls
POSITION
FINE
TIME/DIV OR
DLY TIME
VARIABLE
MAGNIFIED
SWPCAL
2-4
Input connector for external trigger
signal.
Controls horizontal position of dis-
play.
Provides more precise control of
horizontal position.
Selects the basic sweep rate of the
output sawtooth and selects basic
delay time (to be multiplied by the
DELAY TIME MUL T dial setting).
The VARIABLE control must be in
calibrated position and MAG-
NIFIED switch set to Xl for indi-
cated sweep rate.
Two-position switch actuated by
the VARIABLE knob to select cali-
brated or uncalibrated sweep rates.
At the in position, the VAR IABLE
control is inoperative and the sweep
rate is calibrated. When pressed and
released, the knob moves out to
activate the V AR I ABLE control for
uncalibrated sweep rates. The
sweep rate in each TIME/DIV
switch position can be reduced to
at least the sweep rate of the next
adjacent position, to provide con-
tinuously variable sweep rates from
5 nanoseconds/division (Xl0·
MAGNIFIER on) to about 12.5
seconds/division, with MAGNI-
FIER at X1.
Push-button switches to select the
horizontal magnification. The
Selected magnification is indicated
by a lighted button.
Xl :Magnified sweep at the basic
sweep rate indicated by TIME/
DIV switch.
Xl0: Magnified sweep at a sweep
rate 10 times faster than the
basic sweep rate indicated by the
TIME/DIV switch. The portion
of the normal sweep within the
center division of the graticule is
the portion shown in magnified
form.
Screwdriver adjustment to set
amplitude of the output sawtooth.
Delay Controls
B DELAY MODE
(A INTEN
DURING B)
Series of push-button switches to
select the delay logic to the com-
panion delayed-sweep unit (B).
Selected delay mode is indicated by
a lighted button.
INDEPENDENT: The Type 7B51
and the companion delayed-
sweep unit (B) operate inde-
pendently as normal time-base
units.
B STARTS AFTER DELAY: The
companion delayed-sweep unit
(B) produces a sweep immediate-
ly following the delay time selec-
ted by the TIME/DIV OR DL Y
TIME switch and the DELAY
TIME MUL T dial.
B TRIGGERABLE AFTER
DELAY: The companion delayed-
sweep unit (B) produces a sweep
after the first trigger pulse is
received following the delay
time selected by the TIME/DIV
OR DL Y TIME switch and the
DELAY TIME MUL T DIAL.
DELAY TIME MUL T Provides variable delay for the
delay pulse to the companion
delayed-sweep unit (B) from 0 to
10 times the basic delay time selec-
ted by the TIME/DIV OR DELAY
TIME switch.
TEST SETUP CHART
General
Fig. 2-3 shows the front panel of the Type 7B51. This
chart can be reproduced and used as a test-setup record for
special measurements, applications or procedures, or it may
be used as a training aid for familiarization with this instru-
ment.
GENERAL OPERATING INFORMATION
Sweep Calibration Check
Whenever the Type 7B51 is inserted into a plug-in com-
partment other than the one in which it was calibrated, the
sweep calibration shoUld be checked and readjusted if
necessary. Allow five minutes warmup before performing
this procedure.
1. Connect a one-kilohertz calibrator signal from the
Indicator Oscilloscope Calibrator to the Vertical unit input
connector.
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