TB 9-6625-2099-24
CALIBRATION PROCESS FOR AM-6880/U (TEKTRONIX TYPE 7A18)
AND TEKTRONIX, TYPES 7A18A AND 7A18A W/OPTION 06
6. Preliminary Instructions
a. The instructions outlined in paragraphs 6 and 7 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
name as listed in table 2.
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. Additional
maintenance information is contained in the manufacturer's manuals for this TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.
7. Equipment Setup
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 step within the
performance check where 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 the oscilloscope and install TI into oscilloscope left
vertical compartment and time base into horizontal right 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.