TB 9-6625-2099-24
AM-6785/U (TEKTRONIX, TYPE 7A26)
11. Preliminary Instructions
a. The instructions outlined in paragraphs 13 and 14 are preparatory to the calibration
process. Personnel should become familiar with the entire bulletin before beginning the
calibration.
b. Items of equipment used in this procedure are referenced within the text by common
c. Unless otherwise specified, verify the results of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
Adjustments required to calibrate the TI are included in this procedure. Addition
maintenance information is contained in the manufacturers' manuals for this TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.
WARNING
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUTPUT(S) to minimum after each set within the performance
check when applicable.
a. Remove protective cover from TI only when necessary to make adjustments. Replace
cover after completing adjustments.
b. Remove the left side panel from oscilloscope and install TI into oscilloscope left
vertical compartment and time base into right horizontal compartment.
c. Connect oscilloscope to a 115 V ac power source. Energize oscilloscope and allow at
least 20 minutes for warm-up.
d. Position oscilloscope controls as listed in (1) through (3) below:
(1) Press VERT MODE/LEFT pushbutton.
(2) Press TRIG SOURCE/VERT MODE pushbutton.
(3) Adjust INTENSITY, FOCUS, READOUT, and GRAT ILLUM controls as desired.
e. Position TI controls as listed in (1) through (7) below:
(1) DISPLAY MODE switch to CH 1.
(2) TRIGGER SOURCE switch to MODE.
(3) CH 2 POLARITY switch to +UP.
(4) CH 1 and CH 2 POSITION controls to midrange.
(5) CH 1 and CH 2 VOLTS/DIV switches to 10 mV.