Tektronix 2246 1Y Oszilloskop
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Modell:
2246 1Y
Datum:
1989
Kategorie:
Gruppe:
Beschreibung:
PORTABLE OSCILLOSCOPE
Information
The 2246 1Y and 2246 MOD A are 100 MHz, four-channel,
dual-sweep, portable oscilloscopes for general-purpose use.
A microprocessor-based operating system controls most of the
functions in each instrument, including a fully integrated
menu-driven voltage and time measurement system with
SmartCursors®. A menu-driven service mode provides for
configuring of certain menu and readout displays, internal
calibration, and servicing diagnostics. The instruments
include additional EMI shielding. (See Table 1-2,
Environmental Characteristics, for more information.)
The vertical deflection system has four input channels. Two
channels have 11 basic deflection factors from 2 mV to 5 V
per division, and two channels have two basic deflection
factors of 0.1 V and 0.5 V per division. Basic deflection
factors can be extended with attenuator probes. VOLTS/DIV
readouts are switched to display the correct vertical scale
factors when properly coded probes are connected to the
vertical input connectors.
The horizontal deflection system provides single, dual, or
delayed sweeps from 0.5 s to 20 ns per division (delayed
sweep, 5 ms to 20 ns per division). The trigger system
provides stable triggering over the full bandwidth of the
vertical deflection system.
Alphanumeric crt readouts of the vertical and horizontal
scale factors are displayed at the bottom of the screen.
On-screen vertical and horizontal cursors provide accurate
voltage, time, frequency, and phase measurements;
measurement values are displayed at the top of the crt.
The measurement features include voltage measurements
for+Peak, -Peak, Peak-to-Peak, and average DC, or
positionable cursors for measuring voltage difference, time
difference, frequency, and phase. SmartCursors® that
visually track voltage measurements, trigger levels, and
ground can be placed on displayed waveforms. Delay-time and
delta-delay measurements for time, frequency, and phase are
available in ALT and B Horizontal Modes.
STANDARD Accessories
The following items are standard Accessories shipped with
the 2246 1Y and 2246 MOD A instrument:
2 Probes, 10X, 2 meter, with Accessories 1 Probe, 1X, 2
meter, with Accessories 1 Power cord 1 Power cord clamp
1 CRT implosion shield, blue plastic (installed)
1 Fuse, 2A, 250 V, slow-blow
1 Attaching accessory pouch
1 Accessory pouch, ziploc
1 Front cover
The following items are standard Accessories shipped with
the 2246 1Y instrument:
2 Operators manuals
2 Service manuals
2 Reference guides
The following items are standard Accessories shipped with
the 2246 MOD A instrument:
1 Operators manual 1 Reference guide
Dokumenttyp:
Bedienungsanleitung
Seiten:
218
Größe:
1.55 Mbytes (1621527 Bytes)
Sprache:
english
Revision:
Dokument-ID:
070-7061-00
Datum:
Qualität:
Gescanntes Dokument, alles ist lesbar.
Upload Datum:
2011 06 12
MD5:
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Dokumenttyp:
Service- und Bedienungsanleitung
Seiten:
380
Größe:
25.30 Mbytes (26531116 Bytes)
Sprache:
english
Revision:
Revised
Dokument-ID:
070-70620-00
Datum:
1991 10 01
Qualität:
Gescanntes Dokument, teilweise schwer oder teilweise nicht zu lesen.
Upload Datum:
2017 01 15
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Information
SN B700100 and ABOVE (2246 1Y 2R)
SN B100100 and ABOVE (2246 MOD A,
LIST OF ILLUSTRATIONS ... vi
LIST OF TABLES ... vii
OPERATORS SAFETY SUMMARY ... viii
SERVICING SAFETY SUMMARY ... ix
Section 1 SPECIFICATION
INTRODUCTION ...
STANDARD Accessories
RECOMMENDED RECALIBRATION SCHEDULE ... 1-1
PERFORMANCE CONDITIONS . . 1-2
Section 2 PREPARATION FOR USE
SAFETY ... 2-1
LINE VOLTAGE AND POWER
CORD ... 2-1
LINE FUSE ... 2-1
INSTRUMENT COOLING . ... 2-2
START-UP ... 2-2
DETAILED OPERATING INFORMATION ... 2-2
Section 3 THEORY OF OPERATION
SECTION ORGANIZATION ... 3-1
INTEGRATED CIRCUIT
DESCRIPTIONS ... 3-1
BLOCK DIAGRAM
DESCRIPTION ... 3-1
INTRODUCTION ... 3-1
VERTICAL INPUTS
(Diagram 1) ... 3-1
VERTICAL PREAMPS AND OUTPUT Amplifier
(Diagram 2) ... 3-2
A AND B TRIGGER SYSTEM
(Diagram 3) ... 3-2
DISPLAY AND TRIGGER LOGIC AND PROCESSOR Interface
(Diagram 4) ... 3-3
A AND B SWEEPS AND DELAY COMPARATORS
(Diagram 5) ... 3-4
HORIZONTAL OUTPUT
Amplifier (Diagram 6) ... 3-4
Z-AXIS, CRT, Probe ADJUST,
AND CONTROL MUX
(Diagram 7) ... 3-4
MEASUREMENT PROCESSOR
(Diagram 8) ... 3-5
READOUT SYSTEM
(Diagram 9) ... 3-5
SWITCH BOARD AND Interface
(Diagram 10) ... 3-6
ADC AND DAC SYSTEM
(Diagram 11) ... 3-6
POWER SUPPLY
(Diagram 12) ... 3-6
DETAILED CIRCUIT DESCRIPTION 3-6 VERTICAL INPUTS
(Diagram 1) ... 3-6
VERTICAL PREAMPS AND OUTPUT
Amplifier (Diagram 2) ... 3-9
A AND B TRIGGER SYSTEM
(Diagram 3) ... 3-12
DISPLAY AND TRIGGER LOGIC AND PROCESSOR Interface (Diagram
4) ... 3-16
A AND B SWEEPS AND DELAY COMPARATORS
(Diagram 5) ... 3-31
HORIZONTAL OUTPUT Amplifier
(Diagram 6) ... 3-37
Z-AXIS, CRT, Probe ADJUST,
AND CONTROL MUX
(Diagram 7) ... 3-38
MEASUREMENT PROCESSOR
(Diagram 8) ... 3-42
READOUT SYSTEM
(Diagram 9) ... 3-45
SWITCH BOARD AND
Interface (Diagram 10) ... 3-51
ADC AND DAC SYSTEM
(Diagram 11) ... 3-52
POWER SUPPLY
(Diagram 12) ... 3-53
MAIN BOARD POWER DISTRIBUTION
(Diagram 13) ... 3-58
PROCESSOR POWER BOARD DISTRIBUTION (Diagram 14) . . 3-58
INTERCONNECTION DIAGRAM (Diagram 15) ... 3-58
PERFORMANCE CHECK PROCEDURE
INTRODUCTION ... 4-1
TEST EQUIPMENT REQUIRED . . 4-1 PERFORMANCE CHECK
INTERVAL ... 4-1
PREPARATION ... 4-1
INDEX TO PERFORMANCE
CHECK PROCEDURE ... 4-4
DISPLAY ... 4-5
TRACE ROTATION ... 4-5
GEOMETRY ... 4-5
VERTICAL ... 4-6
Input COUPLING Functional
Check ... 4-6
CH 1 and CH 2 VOLTS/DIV
Trace Shift ... 4-6
CH 3 and CH 4 VOLTS/DIV
Trace Shift ... 4-7
CH 1 and CH 2 VAR VOLTS/DIV
Trace Shift ... 4-7
CH 1 and CH 2 Input
COUPLING Trace Shift ... 4-7
CH 2 INVERT Trace Shift ... 4-7
CH 1 and CH 2 VAR
VOLTS/DIV Range ... 4-7
Low-Frequency Linearity ... 4-8
CH 1 and CH 2 Vertical Deflection Accuracy ... 4-8
Ch 3 and CH 4 Vertical Deflection Accuracy ... 4-8
ADD Mode and CH 2 INVERT
Deflection Accuracy ... 4-9
Vertical POSITION Range
(all channels) ... 4-9
CH 1 to CH 2 Signal
Delay Match ... 4-10
CH 1 to CH 4 Signal
Delay Match ... 4-10
CH 3 to CH 4 Signal
Delay Match ... 4-10
CH 1 and CH 2 Vertical Bandwidth ... 4-10
CH 3 and CH 4 Vertical Bandwidth ... 4-11
CH 1 and CH 2 Aberrations . 4-11 SCOPE BW (Bandwidth
Limit) Accuracy ... 4-11
Common-mode Rejection
Ratio ... 4-12
Channel Isolation ... 4-12
AC-Coupled Lower -3 dB
Point ... 4-13
Vertical ALT and CHOP
Modes ... 4-13
BEAM FIND Functional
Check ... 4-13
A and B Trace
Separation ... 4-13
TRIGGERING ... 4-14
500 Hz Trigger
Sensitivity ... 4-14
500 kHz Trigger
Sensitivity ... 4-15
25 MHz Trigger
Sensitivity ... 4-15
100 MHz Trigger
Sensitivity ... 4-15
100 MHz NOISE REJ
Trigger Sensitivity ... 4-16
Single Sweep Mode ... 4-16
Trigger LEVEL Control
Range ... 4-16
TV Field Trigger
Sensitivity ... 4-17
TV Line Trigger
Sensitivity ... 4-17
Line Trigger Functional
Check ... 4-17
HORIZONTAL ... 4-18
A and B Sweep Length ... 4-18
Horizontal POSITION
Range ... 4-18
VAR SEC/DIV Range ... 4-18
Magnifier Registration ... 4-19
A and B Timing Accuracy
and Linearity ... 4-19
A and B Magnified Timing
Accuracy ... 4-19
Delay Time Jitter ... 4-20
Delay Time Accuracy ... 4-21
Delay Time Position
Range ... 4-21
X-Axis Gain Accuracy ... 4-21
X-Y Phase Difference ... 4-22
X-Axis Bandwidth ... 4-22
TIME AND CURSORS
MEASUREMENTS ... 4-23
h- SEC -H and K- 1/SEC-M
Cursor Accuracy ... 4-23
Delta Time Accuracy ... 4-23
k- phase ->| Cursor
Accuracy ... 4-24
K- VOLTS -H Cursor
Accuracy ... 4-24
ib volts -H Cursor
Accuracy ... 4-24
Tracking Cursors Position
Accuracy ... 4-24
CH1/CH2 VOLTMETER
MEASUREMENTS ... 4-25
DC Volts Accuracy ... 4-25
DC Volts Normal Mode
Rejection Ratio ... 4-25
+Peak, -Peak, Peak-to-Peak
Volts Accuracy ... 4-26
25 MHz +Peak, -Peak, and Peak-to-Peak Volts
Accuracy ... 4-26
100 MHz +Peak, -Peak, and Peak-to-Peak Volts
Accuracy ... . 4-26
Gated Volts Accuracy ... 4-26
EXTERNAL Z-AXIS, Probe ADJUST AND FRONT-PANEL
SETUP FUNCTIONS ... 4-28
Check External Z-Axis
Input ... 4-28
Probe ADJUST Output ... 4-28
Run MAKE FACTORY SETTINGS Routine ... 4-28
ADJUSTMENT PROCEDURE
INTRODUCTION ... 5-1
PURPOSE ... 5-1
TEST EQUIPMENT
REQUIRED ... 5-1
LIMITS AND TOLERANCES ... 5-1
PARTIAL PROCEDURES ... 5-1
PREPARATION FOR
ADJUSTMENT ... 5-3
INDEX TO ADJUSTMENT
PROCEDURE ... 5-3
POWER SUPPLY, DISPLAY,
AND Z-AXIS ... 5-4
INITIAL CONTROL
SETTINGS ... 5-4
PROCEDURE ... 5-4
Power supply DC Levels
(R2252) ... 5-4
Grid Bias (R2719) ... 5-5
Astigmatism (R2788) ... 5-5
Trace Rotation (Front Panel) . . 5-5 Geometry
(R2784) ... 5-5
Z-Axis Response (C2704) on instruments with serial numbers
of below B110100 for the 2246
MOD A or below B710100
for the 2246 1Y ... 5-5
Readout Jitter (R724) ... 5-6
VERTICAL ... 5-7
INITIAL CONTROL
SETTINGS ... 5-7
PROCEDURE ... 5-7
Vertical Output Gain (R703) and Readout Vertical Centering
(R260) . ... 5-7
CH 1 Step Balance (R12) ... 5-8
CH 1 MF/LF Gain (R13) and Compensation (C1) ... 5-8
CH 1 Input Capacitance (C114) 5-8
CH 1 Input Compensation X10 (C11) ... 5-8
CH 1 Input Compensation X100 (C10) ... 5-8
CH 1 Gain (R211) ... 5-8
CH 2 MF/LF Gain (R23) and Compensation (C2) ... 5-8
CH 2 Input Capacitance (C124) 5-9
CH 2 Input Compensation
X10 (C21 ) ... 5-9
CH 2 Input Compensation
X100 (C20) ... 5-9
CH 2 Gain (R221) ... 5-9
CH 3 MF/LF Compensation (C134) ... 5-9
CH 3 Gain (R231) ... 5-9
CH 4 MF/LF Compensation (C154) ... 5-9
CH 4 Gain (R241) ... 5-9
Delay-line HF Compensation (R272, R273, R275, C274,
C273) ... 5-10
CH 3 HF Compensation
(C138) ... 5-10
CH 4 HF Compensation
(C158) ... 5-10
CH 1 and CH 2 Bandwidth Check ... 5-10
CH 3 and CH 4 Bandwidth
Check ... 5-11
HORIZONTAL ... 5-12
INITIAL CONTROL
SETTINGS ... 5-12
PROCEDURE ... 5-12
Horizontal X1 Gain (Timing)
(R826) ... 5-12
Horizontal X10 Gain (Tinning)
(R825) ... 5-12
Readout Horizontal Gain (R823) and MAG Registration (R809) .
5-12
A 0.5 p.s Timing (C314) ... 5-13
B 0.5 |xs Timing (C329) ... 5-13
2-5 ns Timing (C807, C814) . 5-13
X Gain (R827) ... 5-13
MEASUREMENT BANDWIDTH AND
SELF CHARACTERIZATION ... 5-14
INITIAL CONTROL
SETTINGS ... 5-14
PROCEDURE ... 5-14
Volts Cal (R920) ... 5-14
B Trigger Bandwidth (R455) . . 5-14 Self
Characterization ... 5-14
CORRECTIVE MAINTENANCE . . . 6-34
INTRODUCTION ... 6-34
MAINTENANCE
PRECAUTIONS ... 6-34
OBTAINING REPLACEMENT
PARTS ... 6-34
REPACKAGING FOR
SHIPMENT ... 6-35
MAINTENANCE AIDS ... 6-35
INTERCONNECTIONS ... 6-35
BATTERY ... 6-37
TRANSISTORS AND
INTEGRATED CIRCUITS ... 6-37
SOLDERING TECHNIQUES . . . 6-37 REMOVAL AND REPLACEMENT
INSTRUCTIONS ... 6-38
STATIC-SENSITIVE
COMPONENTS ... 6-1
PREVENTIVE MAINTENANCE ... 6-2
INTRODUCTION ... 6-2
INSPECTION AND
CLEANING ... 6-2
LUBRICATION ... 6-4
SEMICONDUCTOR CHECKS____6-4
PERIODIC READJUSTMENT ____6-4
TROUBLESHOOTING ... . 6-5
INTRODUCTION ... 6-5
TROUBLESHOOTING AIDS ... 6-5
TROUBLESHOOTING
EQUIPMENT ... 6-6
TROUBLESHOOTING
TECHNIQUES ... 6-6
INTERNAL TESTING
CAPABILITIES ... 6-10
SERVICE MODE ... 6-11
TROUBLESHOOTING HINTS
BY DIAGRAM ... 6-19
TROUBLESHOOTING MEASUREMENT ERRORS ... 6-25
Section 7 OPTIONS
INTRODUCTION ... 7-1
INTERNATIONAL POWER
CORDS ... 7-1
OPTION 1R RACKMOUNTED INSTRUMENT ... 7-1
Section 8 REPLACEABLE ELECTRICAL PARTS Section 9 DIAGRAMS
Section 10 REPLACEABLE MECHANICAL PARTS CHANGE INFORMATION