Tektronix SD-14, Service Manual

Page: 45 / 74

Checks and Adjustments
SDĆ14 Service Manual
2Ć23
Procedure to Examine Linearity/Gain
ăStep 1:ă 3/8/'1/>+ 8.+ /38 7+88/3-7 8.+3 2'0+ 8.+ ,4114;/3- 7+8?
8/3-7 /3 8.+ 46*+6 1/78+*
38 '/3,6'2+
" (98843 56+77
Source Internal Clock
# & (98843 56+77
#""& (98843 ! !+6/+7 56+77
Enhanced Accuracy ! !+6/+7 849).
Calibrate All 545?95 2+39 Recall Defaults
ăStep 2:ă "49). 8.+ DefTra /)43 '3* 849). 8.+ ,4114;/3- 7+1+)8467 /3 8.+
545?95 2+39 /3 46*+6 84 *+,/3+ 8.+ 86')+ '7 M4
Mainframe (11801 Series only), 4 (under Mainframe ), Enter Desc
ăStep 3:ă 3 8.+ '/3,6'2+ 849). 8.+ :+68/)'1 /)43 8.+3 7+8 Vertical
Offset 84 0 V 97/3- 8.+ 034( 46 545?95 0+=5'* 2+39
ăStep 4:ă 6+77 8.+ !# (98843 8.+3 7+1+)8 Measurements ,642
8.+ 2'/3 2+39
ăStep 5:ă 642 8.+ +'796+2+387 545?95 2+39 7+1+)8 Mean
46 +'). 64; /3 "'(1+ ? 43 5'-+ ? 5+6,462 8.+ ,4114;/3- 78+57
ăStep 6:ă !+8 8.+ $418'-+ !496)+ 84 8.+ :'19+ 7.4;3 /3 8.+ V
in
(V)
)41923
ăStep 7:ă 8 8.+ '/3,6'2+ 849). 8.+ :+68/)'1 /)43 '3* 8.+3 7+1+)8
Vert Size:M4 ,642 8.+ 034( 2+39
ăStep 8:ă 3 8.+ Vert Size:M4 545?95 2+39 +38+6 8.+ :+68/)'1 7/>+ 7+88/3-
7.4;3 /3 "'(1+ ?
NOTE
Do not adjust the vertical offset; it should remain at 0 V.
ăStep 9:ă 38+6 8.+ :'19+ */751'=+* /3 Mean /3 8.+ Mainframe Alone
x/10 )41923 /3 "'(1+ ? 918/51= 8./7 :'19+ (= 84 '))4938 ,46 8.+
'88+39'846 '3* +38+6 8.+ 6+7918 /3 8.+ x )41923 "./7 :'19+ ;/11 (+ 97+*
/3 )'1)91'8/3- 8.+ -'/3 '3* 1/3+'6/8= 4, 8.+ !?
+5+'8 78+57 8.649-. ,46 8.+ 3+<8 64; /3 "'(1+ ? %.+3 =49 .':+ ,/11+*
/3 8.+ +38/6+ Mainframe Alone x/10 )41923 '3* 8.+ x )41923 564)++* 84
!8+5