Tektronix TDS 520A, Руководство по обслуживанию, Страница: 122 / 300

Performance Tests
TDS 520A, 524A, 540A, & 544A Service Manual
4Ć43
Confirm the trigger system is within timeĆaccuracy limits for pulseĆglitch or
pulseĆwidth triggering (Horizontal Scale m ( :
Display the test signal: ) ) $*)%*) $ ) (# ,+ #')$' $'
0/ +1+($# (# ,+ $# ('# '(( SET LEVEL TO
50%
Set the trigger mode: '(( TRIGGER MENU $, %'(( ) "#1
"#* *))$# Mode & Holdoff )# ) (1"#* *))$# Normal
Set upper and lower limits that ensures triggering:
H '(( ) "#1"#* *))$# Type )# '%)!. %'(( )
(" *))$# *#)! Pulse ( !) # ) "#* )) %$%( *%
H '(( ) "#1"#* *))$# Class )# '%)!. %'(( )
(" *))$# *#)! Width ( !) # ) "#* )) %$%( *%
H '(( ) "#1"#* *))$# Trig When )# %'(( ) (1"1
#* *))$# Within Limits.
H '(( ) (1"#* *))$# Upper Limit ( ) .$' )$
() ) *%%' !") )$ #( %'(( 10 )# SHIFT )# n )#
ENTER
H '(( ) (1"#* *))$# Lower Limit ( ) .% )$ ()
) !$,' !") )$ #(
Check against limits:
H '(( SET LEVEL TO 50%
H ! $# ) $!!$,# (*%')( "$#)$' ) (%!. ) ,!!
()$% &*'# # ) '$#)1%#! !) TRIG ) ,!! -)#*(
)$ )'"# ,# )''# ( !$()
H ( ) #'! %*'%$( #$ )$ increase ) Lower Limit
'$*) *#)! )''# ( !$()
H )) ) Lower Limit '$*) ( ,)# #( )$ #(
#!*(+
H ( ) .% )$ ')*'# ) Lower Limit )$ #( # '()!(
)''#
H '(( ) (1"#* *))$# Upper Limit )# *( ) #'!
%*'%$( #$ )$ (!$,!. decrease ) ) Upper Limit '$*)
*#)! )''# ( !$()
H )) ) Upper Limit '$*) ( ,)# #( )$ #(
#!*(+