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Tektronix 2235 User Manual
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M
A
NU
A
L
C
H
A
N
G
E
I
NF
O
RM
ATIO
N
At
Tektronix,
we
continually
strive
to
k
eep
up
with
latest
electronic
develo
p
ments
by
adding
circuit
and
component
improvements
to
our
instruments
as
soon
as
they
are
develo
p
e
d
a
nd
tested
.
Sometimes,
due
to
printing
and
s
hipping
r
equirements,
we
can't
get
these
changes
immediately
into
printed
manuals
.
H
ence,
your
manual
may
contain
new
change
information
on
following
p
ages
.
Α
single
change
may
affect
several
sections
.
Sincethe
change
information
s
heets
are
carried
i
n
t
he
manual
until
all
changes
are
p
ermanently
entere
d
,
some
d
u
p
lication
may
occur
.
If
no
such
c
hange
p
ages
appear
following
this
p
age,
your
manual
is
correct
as
p
rinted
.
225
227
Table of Contents
Table of Contents
4
Operators Safety Summary
7
Th E 2235 Oscillosco Pe
9
Specification
10
Environmental Characteristics
10
Introduction
10
Accessories
10
Performance Conditions
10
Electrical Characte Ristics
11
M Aximum Input Voltage
13
Line Fuse
15
Probe Adjust
15
Cathode-Ray Tube
15
De Rating Curve for CH 1 or Χ, CH 2 or Υ
16
Physical Characteristics
18
Preparation for Use
19
Ine Voltage
19
Safety
19
Operating Instructions
20
Power Cord
20
Instrument Cooling
20
Indicators
20
Power, Display, and Probe Adjust
20
Co Nn Ector and Indicator
21
Vertical
21
Horizontal
22
Trigger
24
Rear Panel
25
Operating Considerations
26
Graticule
26
Grounding
26
Input Coupling Capacitor Precharging
26
Signal Connections
26
Operator's Adjustments
27
Introduction
27
Probe Compensation
27
Trace Rotation
27
Oscilloscope Displays
28
Baseline Trace
28
Introduction
28
Delayed-Sweep Display
29
Delayed-Sweep Measurements
29
Magnified-Sweep Display
29
Signal Display
29
Tv Signal Displays
30
Χ-Υ Display
30
Theory of Operation
32
Measurements
32
General Description
33
P Ro be Compensation
34
B Uffer Amplifier and Gain
35
Switching N Etwork
35
Paraphase Amplifier
35
Vertical Preamplifiers
36
Vertical Output
37
Delay L Ine Driver
37
Ertical Output Amplifier
37
Α/Β Sweep Separation Circuit
38
Trigger Amplifiers and
38
Internal Trigger
38
Switching
38
Ine Trigger Amplifier
39
Internal Trigger Amplifier
39
Α External Trigger am Plifier
39
Α Trigger Generator
40
V Trigge R Circuit
40
Α Trigger L Evel Comparator
40
Α Trigger Level Circuit
40
Α Sweep Generator and Logic
40
Α M Iller Sweep Generator
41
Detailed Circuit Description
34
Vertical Attenuators
34
In P Ut Coupling
34
Lock Diagram of the Α Sweep Generator
41
Ogic Circuitry
41
Α Sweep L Ogic
42
Alternate Β Sweep
42
Iller Sweep Generator
43
Runs after Delay
43
Β Delay Time Position Comparator
43
Β M
43
Β Sweep Logic
43
Β Trigger Evel Comparator
43
Alternate Display Switching L Ogic
44
Β Ζ-Axis Ogic
44
Horizontal
44
Horizontal Preamplifier
45
Χ-Υ Amplifier
45
Horizontal Output Amplifier
46
Z-Axis Amplifier
46
DC Restorer
47
Power Input
48
Power Supply and Probe Adjust
48
Preregulator
48
Crt Supply
49
Focus Circuit
49
L Ow-Voltage Supplies
50
Performance Check
51
Troubleshooting Aids
51
Preparation for Checks
52
Vertical
54
Introduction
51
Purpose
51
Structure
51
Test Equipment
51
Limits and Tolerances
51
Deflection Accuracy
54
Settings for B
56
Horizontal
58
Settings for Timing Accuracy Checks
59
Settings for Delay Time Accur Acy Checks
60
Trigger
62
Switch Combinations for Α Triggering
62
Chec Ks
64
External Z-Axis and Probe Adjust
65
Adjustment Procedure
66
Introduction
66
Purpose
66
Structure
66
Test Equipment
66
Limits and Tolerances
66
Adjustment Interaction
66
Preparation for Adjustment
66
Ndex to Adjustmen T Proce Dure
68
Index to Adjustment Procedure Steps
68
Power Supply and Crt Display
68
E Quipment R
69
Power Su Pply L
69
Procedure Steps
69
5. Adjust Trace Alig Nment
70
Adj Ust Astigmatism
70
Adj Ust CRT Gri D B Ias
70
Adjust Geometry
70
Vertical
71
Ad Just Atte Nuator Step Balance
71
Chec K Hig H-Voltage Su Pp Ly
70
Ad Ju St Channel
72
Ad Just 2/5 MV DC B Alance
72
Ad Just Channel 2 Invert B Alance
72
Adj Ust V Ertical Gain
73
C Hec K in P Ut Cou P Ling
73
Attenuator Compensation Ad Ju Stments
74
Adjust Attenuator Compensatio N
74
10. Chec K Alte Rn Atio N Operatio N
75
Chec K Ch Op Operation
75
15 . Chec K Position Range
76
Adjust 2-MV Pea King Com Pensation
76
Chec K Trigger Iew Gai N
76
Settings for B Andwidth Chec Ks
77
16 . Chec K Ban Dwi Dth Limit Operatio N
77
17 . Check Bandwi Dth
77
Chec K Ch an Nel Isolation
77
Adjustment Proced Ure-2235 Service
77
Horizontal
79
Adjust Horizontal am P Lifier Gain
79
H Orizontal
79
Adjust Χ10 Horizontal am P Lifier Gain
80
A D Ju St Magnifier R Egistration
80
Chec K Swee P Lengt H
80
Chec K Position R Ange
80
6 . Check Variable Range
80
Adjust Delay Dial Timi Ng
81
Adjust Hig H-Speed Timing
81
Adjust 5-Ns Timing and L Inearity
81
Check Timing Accuracy and L Inearity
81
Settings for Timi Ng Accuracy Checks
82
Check Delay Time Dial R Ange and Accuracy
82
Settings for Delay Time Accuracy Checks
83
Check Delay J Itter
83
13 . Check Sweep Separation
84
Ad Just Χ Gain
84
Check Χ B an Dwidth
84
16 . Check Α-Sweep Holdoff
84
Trigger
85
Adju St Trigger Sensitivity
85
Adjust Trigger Offset
85
Trigge R
85
Adju St Slope B Alance
86
Chec K Nternal Trigge Ring
86
6 . Chec K External Trigge Ri Ng
87
Check Exter Nal Trigge R Ranges
87
8. Check Single Sweep Operation
88
External Z-Axis and Probe Adjust
89
Chec K External Ζ -Axis Operation
89
2. Chec K Pr Obe Adju St Operatio N
89
Maintenance
90
Static-Sensitive Components
90
Preventive Maintenance
91
General Care
91
Inspection and Cleaning
91
Ntroduction
91
And Replacement
92
External Inspection Chec Klist
92
Inte Rnal Inspection Chec Klist
92
Lubrication
93
Periodic Readjustment
93
Semiconductor Checks
93
Introduction
94
Troubleshooting
94
Troubleshooting Equipment
95
Power Supply L Imits and
97
Aintenance Aids
99
Corrective Maintenance
99
Introduction
99
Maintenance Precautions
99
Nterconnections
99
Obtaining Replacement Parts
99
Transistors and Integrated Circuits
100
Soldering Techniques
101
Nstructions
102
Cabinet
102
Power-Supply Shield
103
F Ilter Circuit B Oard
104
Alt Sweep Circuit B Oard
104
Timing Circuit B Oard
105
B Ottom Shield, Attenuator a Nd
106
Front-Panel Circuit B Oard
106
M Ain Circuit B Oard
107
Repackaging for Shipment
109
Selectable Components
109
Trigger Bandwidth Alteration
109
Options
110
Replaceable Electrical Parts
112
Diagrams
144
F Ig Ure
146
Inverter
149
Ta Ble
174
Llu Str
210
Circ Uitry
212
Ble
213
Ipple
213
Parts
213
Change Information
226
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53 pages
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Tektronix 2235 Specifications
General
Brand
Tektronix
Model
2235
Category
Test Equipment
Language
English
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