Tektronix TAS 465, Service Manual

Page: 92 / 268

! !
! !
5Ć8
# $
! ! One time markgenerator (item 9), one precision
coaxial cable (item 5), and one 50 W termination (item 3).
! CRT adjustment procedure.
NOTE
To enable factory calibration on oscilloscopes with firmware version
2.10
or above, remove jumper J205 (CAL-DIS) on the CPU board.
(SeeFigure5Ć17 on page5Ć23 for thelocation of J205.) If you do
not remove this jumper, the message See manual to enable FactoĆ
ry Cal" appears when you select the factory calibration routine.
Firmware versions below
2.10
do not havethecalibration lockout
featureand thefactory calibration routinecan still executewith J205
installed.
1. Disconnect all signal inputs from the oscilloscope.
2. Press the button to display the Utility menu.
CAUTION
To avoid replacing the calibration constants with erroneous values,
besureto completeall steps of this procedureafter initiating the
calibration routine.
3. Select from the main menu.
4. Select # $ , initiating the calibration routine.
This routine takes about 20 seconds to complete its initial calibrations.
Once complete, 2 dots are displayed and the message 
" ! " appears. The displayed dots are used for the next
horizontal calibration steps.
NOTE
Thefollowing steps useboth theGeneral PurposeKnob and the
TOGGLE button to make adjustments. The General Purpose Knob
performs two functions: to adjust horizontal gain and centering. The
TOGGLE button selects the function of the General Purpose Knob.