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I- T C I/ SERVICE 070-7067-00
Product Grow 41
2232
DIGITAL STORAGE
OSCILLOSCOPE
SERVICE
THE FOLLOWING SERVICING INSTRUCTIONS ARE
FOR USE BY QUALIFIED PERSONNEL ONLY. TO
AVOID PERSONAL INJURY, DO NOT PERFORM ANY
SERVICING OTHER THAN THAT CONTAINED IN
I OPERATING INSTRUCTIONS UNLESS YOU ARE
&IALIFIED' TO DO so. REFER TO OPERATORS
SAFETY SUMMARY AN0 SERVICE SAFETY SUM- I
MARY PRIOR TO PERFORMING ANY SERVICE.
Please Check for
CHANGE INFORMATION
at the Rear of This Manual
First Printing OEC 1989
Revised APR 1990
2232 Service
TABLE OF CONTENTS
Page Page
LIST OF ILLUSTRATIONS . . . . . . . . . . _. .. . a. Ill STORAGE ACQUISITION ..... 3-29
LIST OF TABLES . . . . . . . . . . . . . . . . . . . .. . .. .Y DIGITAL TIME BASE ......... 3-30
OPERATORS SAFETY SUMMARY *. _ . . . .. . .. vl DIGITAL DISPLAY ............ 3-31
SERVICING SAFETY SUMMARY . . . . . . . . .. . .. VII VECTOR GENERATOR ....... 3-33
DIGITAL ACQUISITION AND
Section I SPECIFICATION MEMORY .................. 3-34
POWER INPUT, PREREGULATOR
INTRODUCTION ............. l-l AND INVERTER ............. 3-35
ACCURACY ANW
POWER SUPPLY SECONDARIES,
RESOLUTION ................ 1-l Z-AXIS AND CRT ............ 3-38
STANDARD ACCESSORIES .... l-2
X-Y PLOTTER .............. 3-41
PERFORMANCE
CONDITIONS ................ l-2
Sectlon 4 PERFORMANCE CHECK
OPERATING INFORMATION PROCEDURE
SAFETY ..................... 2-1 INTRODUCTION ............... 4-l
LINE VOLTAGE ............... 2-l PURPOSE .................. 4-l
POWER CORD ............... 2-l PERFORMANCE CHECK
LINE FUSE .................. 2-l INTERVAL ................... 4-l
INSTRUMENT COOLING ....... 2-2 STRUCTURE ................ 4-l
START-UP .................. 2-2 TEST EQUIPMENT
REPACKAGING .............. 2-2 REQUIRED .................. 4-l
LIMITS AND TOLERANCES ..... 4-l
THEORY OF OPERATION PREPARATION FOR CHECKS ... 4-1
SECTION ORGANIZATION ..... 3-1 INDEX TO PERFORMANCE
CHECK STEPS ............... 4-3
INTEGRATED CIRCUIT
DESCRIPTIONS .............. 3-1 VERTICAL ...................... 4-4
GENERAL DESCRIPTION ...... 3-1 INITIAL CONTROL
DETAILED CIRCUIT SEITINGS .................. 4-4
DESCRIPTION ................. 3-7 PROCEDURE STEPS .......... 4-4
INTRODUCTION ............. 3-7 HORIZONTAL ................. 4-l 1
VERTICAL ATTENUATORS ..... 3-7 INITIAL CONTROL
VERTICAL PREAMPLIFIERS .... 3-9 SETTINGS ................. 4-I 1
VERTICAL OUTPUT PROCEDURE STEPS ......... 4-l 1
AMPLIFIER ................. 3-12 TRIGGER .................... 4-16
TRIGGERING ............... 3-13 INITIAL CONTROL
A SWEEP GENERATOR AND SElTlNGS ................. 4-1 B
LOGIC ..................... 3-17 PROCEDURE STEPS ......... 4-16
B TIMING AND ALTERNATE DCTERNAL Z-AXIS. PROBE ADJUST,
B SWEEP .................. 3-20 EXTERNAL CLOCK, AND X-Y
HORIZONTAL ............... 3-24 PLOTTER .................... 4-20
MICROPROCESSOR ......... 3-26 INITIAL CONTROL
STATUS ADC AND BUS SETRNGS ................. 4-20
INTERFACE ................ 3-29 PROCEWURE STEPS ......... 4-20
I
2232 Service
Section 5 AVJUSTMENT PROCl3XIRE
INTRODUCTION ............... 5-1 DIAGNOSTICS .............. 6-15 -
PURPOSE .................. 5-l CORRECTIVE MAINTENANCE ... 6-21 I
STRUCTURE ................ 5-1 INTRODUCTION ............ 6-21
TEST EQUIPMENT MAINTENANCE
REQUIRED .................. 5-l PRECAUTIONS ............. 6-21 II
LIMITS AND TOLERANCES ..... 5-l OBTAINING REPLACEMENT
ADJUSTMENTS AFFECTED PARTS ..................... 6-21'
BY REPAIRS ................. 5-l MAINTENANCE AIDS ........ 6-21
I
PREPARATION FOR INTERCONNECTIONS. ....... 6-23
ADJUSTMENT ............... 6-2 LITHIUM BAlTERY (BTI 101) ... 6-23
INDEX TO ADJUSTMENT TRANSISTORS AND
PROCEDURE STEPS .......... 5-3 INTEGRATED CIRCUITS ...... 6-23
POWER SUPPLY AND CRT SOLDERING TECHNIQUES ... 6-23
DISPLAY ...................... 5-4
REMOVAL AND REPLACEMENT
INITIAL CONTROL INSTRUCTIONS ............. 6-25
SETTINGS .................. 5-4
PROCEDURE STEPS .......... 5-4
VERTICAL ..................... 5-6 Sectlon 7 OPTIONS
INITIAL CONTROL
SEITINGS .................. 5-6 INTRODUCTION ............... 7-l
PROCEDURE STEPS .......... 6-6 OPTIONS DESCRIPTION ........ 7-1
I
HORIZONTAL ................. 5-15 INTERNATIONAL POWER CORD
INITIAL CONTROL OPTIONS ................... 7-1
SEITINGS ................. 5-15 OPTION 10 .................. 7-1
PROCEDURE STEPS ......... 5-15 OPTION 12 .................. 7-1
TRIGGER .................... 5-21 OPTION 33 .................. 7-l
INITIAL CONTROL SERVICING INFORMATION,, 7-l
SEITINGS ................. 5-21 OPTION 10 THEORY OF
PROCEDURE STEPS ......... 5-21 OPERATION ................. 7-l
OPTION 12 THEORY OF
OPERATION ................. 7-3 I
SeCtIon 6 MAINTENANCE
PERFORMANCE CHECK
STATIC-SENSITIVE PROCEDURE ................ 7-4
COMPONENTS . 6-l ADJUSTMENT PROCEDURE ... 7-6
PREVENTIVE MAINTENANCE 6-2 OPTION MAINTENANCE
INTRODUCTION .t 6-2 INFORMATION t 7-6
GENERAL CARE . . t , . 6-2 I
INSPECTION AND CLEANING 6-2 Sectlon 9 REPLACEABLE ELECTRICAL PARTS
LUBRICATION 6-4
SEMICONDUCTOR CHECKS 6-4
Sectlon 9 DIAGRAMS I
PERIODIC READJUSTMENT.. 6-4
TROUBLESHOOTING . 6-4
INTRODUCTION .. 6-4 Section 10 REPLACEABLE MECHANICAL PARTS
TROUBLESHOOTING AIDS . 6-4
TROUBLESHOOTING
EQUIPMENT.. . , *. 6-10 CHANGE INFORMATION
2232 Servlce
LIST OF ILLUSTRATIONS
Page
The2232Oscilloscope ............................................... VIII
Maximum Input voltage versus frequency derating curve for the CW 1 OR X.
CH2ORY,andEXflNPUTconnectors .................................. I-17
Physical dimensions of the 2232 Oscilloscope ............................ 1-18
Securing the detachable power cord to the instrument ...................... 2-l
Optional power cords. ................................................ 2-2
3-l Simplified block diagram .............................................. -. 3-2
3-2 Block diagram of the Channel 1 Attenuator circuit .......................... 3-8
3-3 Store/Non-Store Vertical Switching ...................................... 3-l 1
3-4 Block Diagram of the Trigger Amplifiers and Switching ...................... 3-14
3-5 A Sweep Generator and Logic circuitry .................................. 3-18
37-6 B Sweep Generator and Logic clrcultty .................................. 3-21
3-7 Horizontal Amplifier block diagram ...................................... 3-25
3-8 Power Supply block dlagram ........................................... 3-36
3-9 Simplified diagram of the DC Restorer circuitry ............................ 3-40
6-1 Multi-connector holder orientation ...................................... 6-7
6-2 GroundingthesignallinesofP2111andP211.2 ........................... 6-7
6-3 Isolated Kernel timing ................................................. 6-6
6-4 DiagnosticMenu Map ................................................ 6-16
6-5 Location of screws and spacers on the Storage circuit board ................ 6-27
6-6 Recessed screw and rear hinge removal ................................. 6-28
6-7 Location of screws securing Power Supply shield and the support bracket to the
rearchassisframe ................................................... 6-30
9-l Color codes for resistors and capacitors
9-2 Semiconductor lead configuratlons
9-3 Locating COmpoflents on schematic diagrams and circuit board illustrations
9-4 Detailed analog block diagram
9-5 Detailed storage block diagram
9-6 A2-Attenuator board
9-7 A14-CH 1 Logic board
9-8 A15-CH 2 Logic board
9-9 Al -Main board
9-10 Circuit View of Al -Main board
9-11 Al A8 - CH 1 Bandwidth Limit board
9-12 Al A9 - CH 2 Bandwidth Limit board
9-13 A3 - Front Panel board
9-14 Circuit view of A3 - Front Panel board
9-15 A4-Timing board
9-16 Al 3 -Sweep Interface board
9-17 A5-Alternate Sweep board
9-19 AB-EMI Fil;er board
9-20 AlAlE-Thermal Shutdown board
O-21 A31 -Scale lllum board
Q-22 AIO-Storage board
9-23 A20-XY Plotter board
O-24 A21 - RS-232 Option board
9-25 A22-GPIB Option board
O-26 Al -Main board adjustment looations
9-27 A2-Attenuator board adjustment locations
O-28 A4-Timing board adlustmont locations
9-29 AS-Ah Sweep Logic board adjustment locations
9-30 Al 6-Sweep Reference board adjustment locations
Q-31 AIO-Storage board adjustment locations
2232 Service
LIST OF TABLES
Table Page
l-l Electrical Characteristics ................................................... i-3
1-2 Environmental Characteristics .............................................. 1-15
l-3 Physical Characteristics ................................................... i-17
3-l Memory Space Allocation ................................................. 3-28
4-l Test Equipment Required ................................................... 4-2
4-2 Deflection Accuracy Limits ................................................. 4-4
4-3 Storage Deflection Accuracy ................................................ 4-5
4-4 Settings for Bandwidth Checks .............................................. 4-7
4-5 Settings for Timing Accuracy Checks ........................................ 4-12
4-6 Settings for Delay Time Differential Checks ................................... 4-14
4-7 Switch Combinations for A Triggering Checks ................................. 4-16
5-l Adjustments Affected by Repairs ............................................ 5-2
5-2 Power Supply Limos ....................................................... 5-4
5-3 Deflection Accuracy Limits ................................................. 5-8
5-4 Store Deflection Accuracy ................................................. 5-10
8-5 Attenuator Compensation Adjustments ....................................... 5-11
5-6 Settings for Bandwidth Checks ............................................. 5-13
5-7 Settings for Timing Accuracy Checks ........................................ 5-18
5-8 Settings for Delay Time Differential Checks ................................... 5-19
6-1 Relative Susceptibility to Static-Discharge Damage ............................. 6-l
6-2 External Inspection Checklist ................................................ 6-2
6-3 Internal Inspection Checklist ................................................ 6-3
B-4A Timing Switch Interface Voltages. ............................................ 6-Q
6-48 Timing Switch Interface Voltages ............................................ 6-10
6-5 Vertical VOLTS/DlV Interface Voltages ........................................ 6-11
B-6 AC GND DC Switch Interface Voltages ....................................... 6-l 1
6-7 ProbeCoding ........................................................... 6-12
6-8 Power Supply Voltage and Ripple Limits ..................................... 6-l 3
6-Q DiagnosticTestsand Messages ............................................ 6-15
6-10 Error Codes for Pu Test ................................................... 6-17
6-11 Display Format for Front Panel IO Exerciser ................................... 6-18
6-12 OutputPortsExerclser .................................................... 6-19
6-13 Maintenance Aids ........................................................ 6-22
7-1 GPIB Status Brrffer Functions ................................................ 7-3
7-2 KS-232-C Status Buffer Functions ........................................... 7-4
7-3 Test Equipment Required ................................................... 7-5
2232 Setvlce
OPERATORS SAFETY SUMMARY
The safetv information in this summaw is for onerating -. personnel. Warnings and cautions will also be found throughout
the ma&al where they apply. .
Terms in This Manual Grounding the Product
CAUTION StStementS identify conditions Or practices This product Is grounded through the grounding can-
tnat could result In damage to the equipment or other ductor of the power cord. To avoid electrical shock, plu.
property. the power cord into a properly wired receptacle before
making any connections to the product input or output
WARNING statements identify conditions or practices terminals. A protoctlve ground connection, byway of the
that could result in personal injuy or loss of life. grounding conductor in the power cord, Is essential for
safe operation.
Terms as Marked on Equipment
Danger Arising From LOSSof Ground
CAUTION indicates a personal injury hazard not immedi-
ately accessible as one reads the markings, or a hazard Upon loss of the protective-ground Connection, all
to property, including the equipment itself. accessible conductive parts, including knobs and con-
trols that may appear to be insulating, can render an
DANGER lndlcates a personal injury hazard immediately electric shock.
accessible as one reads the marking.
Use the Proper Power Cord
Symbols in This Manual
Use only the power cord and COnnectOr specified for
This symbol indicates where applicable your product.
cautionary or other information is to
be found. FOr maximum input voltage Use only a power cord that Is In good condition. I
see Table l-1,
For detailed information on power COrdS and con-
nectors, see Figure 2-2.
I
Symbols as Marked on Equipment
Use the Proper Fuse
DANGER-High voltage. To avoid fire hazard, use only a fuse of the correct type,
voltage rating and current rating as specified in the parts
list for your product.
@ Protective ground (earth) terminal.
ATTENTION-Refer to manual. Do Not Operate in an Explosive
A
Atmosphere
To avoid explosion, do not operate this instrument in an
Power Source explosive atmosphere.
Ttlis prOduct is Intended to operate from a power source
that does not apply more than 250 V rms between the Do Not Remove Covers or Panels
supply conductors or between either supply conductor
and ground. A protective ground connectlon, by way of To avoid personal injury, do not remove the product
the grounding conductor in the power cord, is essential covers or panels. Do not operate the product without the
for safe operation. covers and panels properly installed. e
VI
I
FOR QUALIFIED SERVICE PERSONNEL ONLY
Refer also to the preceding Operators Safety Suiwmy
Do Not Service Alone Disconnect power before removing protective panels,
soldering. or replacing components.
Do not perform internal service or adjustment of this
product unless another person capable of rendering first
aid and resuscitation Is present Power Source
This product is intended to operate from a power source
Use Care When Servicing With Power On that does not apply more than 250 volts rms between the
supply conductors or between either supply conductor
Dangerous voltages exist at several points in this and ground. A protective ground connection by way of
product. To avold personal injury, do not touch exposed the grounding connector In the power cord is essential
connections or components while power is on. for safe operation.
2232 Servlce
The 2232 Dlgltal Storage Oscilloscope.
viii
Section 1-2232 Service
SPECIFICATION
INTRODUCTION mode, SAVE REF memories,
acquisition if diSplayad,
SAVE mode, and SWEEP LIMIT, if active.
The TEKTRONIX 2232 is a combination nonstorage and Digital storage maxlmum sampling rate is 100
digital storage portable, dual-channel oscilloscopewith megasamples per second with a maximum stored
100 MHz analog bandwidth and up to 100 MS/s digital record length per waveform of either 4096 bytes (4K) for
sampling rate. The vertical channels have calibrated single-channel acquisitions or 2048 bytes (2K) for dual-
deflection factors from 2 mV to 5 V per division. The channel acquisitions (ALT or CHOP). In CHOP mode,
Variable VOLTS/DIV gain control increases the deflec- both channels are sampled simultaneously. The digital
tion factor at least 2.5 to 1 on any VOLTS/DIV setting. storage acquisition system has glitch-catching
Vertical display modes are CH 1, CH 2, and BOTH, with a capabilities for glitch widths as narrow as 10 ns.
choice in BOTH of ADD, ALT, or CHOP A BW LIMIT Up to three waveform sets (CH I and/or CH 2) of IK
feature limits the vertical amplifier system and the A record length (512 data points each waveform for dual-
Trigger system to 20 MHz. channel acquisitions) or one waveform set of 4K record
lengtn (2K when dual-channel) may be stored in the
The horizontal deflection system calibrated A Sweep SAVE REF memories. In either case, previous data is
speeds range from 0.5 s to 50 ns per division; calibrated over-written. A saved waveform may be recalled for
B Sweep speeds range from 50 ms to 50 ns per division. display and comparison with the current acquisition
A Xl 0 MAG control decreases sweep time per division of waveform and any or all of the other saved waveforms.
the A and B Sweeps byafactor of 10. Thefastest sweep- The X10 MAG control is also functional for STORE
speed time of 50 ns per division is extended to 5 ns per waveforms and provides for horizontal expansion of 10
division in X10 MAG. The Variable SEC/DIV control may times. The CURSOR Control may be used to reposition
be used to increase the non-store sweep time per the display window on X10 expanded STORE
division by a factor of up to four times from the calibrated waveforms to vlew the entire acquisition.
time per divlslon determined by the SEC/DIV switch set-
ting. In STORE Mode, rotating thevariable SEC/DIVcon- On stored waveforms (current acquisition and saved dis-
trol out of the CAL detent position compresses a 4K sam- plays), voltage and time measurements may be made
ple acquisition rscord into a record of IK samples using CURSORS. The cursors are positioned to the
(called 4K compress mode). Also in STORE Mode, the A waveform of interest and then to the points of interest in
SEC/DIV X10 Multiplier adds calibrated storage time the waveform. The AV and At crt readouts indicate the
bases of 1,2, and 5 s per division to the NON STORE A voltage difference and timing difference between the
Sweep Speed range for low-frequency signal positions of the cursors on the waveform selected. Hori-
acquisltlons. zontal positioning of the 1 K display window within a 4K
acquisition record is also provided by the CURSOR
Posltloning control. In this manner, the entire 4K record
The digital storage and display portlon of the 2232 is length may be scrolledthrough for display on the crt. The
microprocessor controlled. Selecting the digital storage displayed 1 K window of a 4K record length acquisition
featUreS is done with a combination of front-panel waveform is the data stored when using the SAVE REF
controls and menu choices. Selected front-panel memory to savs 1 K waveform data. A 4K record length
controls are read by the microprocessor to determine acquisition may also be compressed to a IK record
their settings. Those settings are reported to the user In a length by rotating the variable SEC/DIV control away
crt readout display generated for the CH 1 and CH 2 from the CAL detent position. The complete waveform is
VOLTS/DIV switch, the A and B SEC/DIV switch, tile then only one display window in length. A 4K compress
DELAY TIME Position control, the Voltage and Time waveform may be saved in any of the three 1 K SAVE REF
cursor differences (on STORE Mode displays only), the memories.
position Of AC-GND-DC switches, and the A Trigger
LEVEL voltage level. All the parametric information for ACCURACY AND RESOLUTION
the waveform display is therefore visible when a hard
copy is made to maintain a permanent record of the Finite resolution affects any measurement using discrete
misplay. wnen in STORE (digital) mode, additional numbers. All digital storage stores amplitude values as
readout information is displayed showing storage discrete numbers and associates those amplitude
1-l
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