Equipment information

Tektronix 2246 1Y Oscilloscope
Manufacturer:
Tektronix
Model: 2246 1Y
Date: 1989
Category: Measurement instruments
Group: Oscilloscope
Description: 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

These manuals are available for the above equipment:

Manual Type: User Manual Tektronix-2489-Manual-Page-1-Picture
Pages: 218
Size: 1.55 Mbytes (1621527 Bytes)
Language: english
Revision:
Manual-ID/Number: 070-7061-00
Date: June 1989
Quality: Scanned document, all readable.
Upload date:
MD5: 3033aaa6d0d109d9ac3e9be73a751f17
Downloads: 2227 since 12 June 2011
Information:

Tektronix-2489-Manual-Page-1-Picture


Manual Type: Service and User Manual Tektronix-8426-Manual-Page-1-Picture
Pages: 380
Size: 25.30 Mbytes (26531116 Bytes)
Language: english
Revision: Revised
Manual-ID/Number: 070-70620-00
Date: 01 October 1991
Quality: Scanned document, reading partly badly, partly not readable.
Upload date:
MD5: ac013e58372c50f00c1d8d4943016829
Downloads: 282 since 15 January 2017
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

Tektronix-8426-Manual-Page-1-Picture


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