Tektronix 2212 User manual

Service Manual
Tektronix.:·
/
2212
Digital Storage & Analog Oscilloscope·
070-8439-01
Please check for CHANGE INFORMATION
at the rear of this manual.
First Printing: June 1992
Revised: March 1903

P-; . ~
• I \
'''
''
·INSTRUMENT SERIALrNUMB,a.tS ·. t
Each instrument has a serial number on a panel insert, tag, or stamped on the ahassis. The first letter in the
sei;ial,Jn,1rnh~r designates,th1;3 cmmt:ry.gfmant}.{a_Qture, ;The, lis,tJiv:~;di,gi~ :v.h4e ~i-ial nuH1b(;lr are assigned
sequantiaUy-and are unique. to €ijCh imittumentThose ,manufactu~e.d,in,th~:U~ited1States hav:e six unique
.digitJ..'Fhe:cmm:ttry ofmanufacture is identified-as follows~ "·,, · ,. i , :t
BOOOOOO ·'
J300000
H700000
HKOOOOO
Tektroni:ic, Ihc.;'Beavei-ton·, Oregon,'U:S.A. · ''
Sony I Tektronix, Japan ,-,-,
Tektronix Holland, N.V.,·•Heerenveen, The Nethedapd3,. \. , ·
:rektrorux, Irtc.:'.Hciftg•K6:ng'> · ,:: · .. ,; ,, ·' , . "·
""!: : rt -.-- ! ·t
I
fostrum~rits tjianufacWrecHor Tektidnbcby exte:rnal1\rextdbrs:oqtsfde the l)nited St~t~s.areassign€id a two digit
alpba dode to identify the cou'ntry' ofrriantifacture:(e.g., J3
1
fot1~pa;n;'HK forlfong Korig, IL f9r Israel, etc.).
' .-:, .
T~~:roni:,~nc. ~ P.C\po~. ~oo,)3ea~r;\~/R~.~!~~t/~;, ~r ·_· '. •-~/ · .~t , .. _.
11
:i, .' :,
P1;i1?;t~~i.nd'~~&~uc~d ii(~~ t-Jetli~ffi11ci~.; ,•>~ ·'.;>:
1
: ./'
t'
i.·: :•· ··.· 1,\ ;/\, ·/, :>'. ,:i;" ~;•it.:,,
:_!~/.,: \M, ~-1' -~ _, .... :;.,; /. ,,4, J.i d.:11 __ ,r:·;~ t" 'r ·,, ~ > :~~\__
1
.• ,r_rr-,· r;.,_ ti ,\ -.i::l
Copy~igbt © T~~ro¢x,Jnc.19~2
1 A:ll·rii~~·Iese~E)_Q./Jj~lctfOf!i*i}1}faj~~r9re c;~ve,r~d.by U.S.
and foreign
patents, issued and pending. .Tu~:J:ollqwi]jlg. cK"e. .regi~emd tr,i~t!:mtrk?"- 1,fEKTRQNIX, :'T:{::!\; Tr:l<PROBE,
SCOPE-MOBILE. . . . . . . . . .
Epson is a registered trademark of Epson America, Inc.
HPGL is a product of the Hewlett-Packard Company.

WARRANTY
Tektronix warrants that this productwill be free from defects in materials and workmanship for aperiod of three (3) years
from thedate of shipment.Ifanysuch productprovesdefectiveduringthiswarrahtj:1pedbd,tI:~k:ti:oni~.atitsoptioii;'eilner
will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the
defective prod_ucL,::'.; ·. '.:J.?:c'•:.\·_-;. , · _;_, .• ,,; ; 1 .L -:,, ;·,,·,:,- •;;·• n;;,_,
In order to obtain service under this warranty', Cast6mei most ntit'ify TeRtronix-ofthe d~f-ect befolie:the expiration ofthe
warranty period and mal4-e-:suitabl.e,'a.rran'g~fllents for the performance of-the senrice.lCustomer shall be responsiblefor
packaging and shipping of the defective product to .the service c<;Joter des:ignateq:by,.;fekti:onix, w~th..shipping cl!arges
prepaid. Tektronix shall pay for the return of the product to Customer if shipment is to a location within the country in
which theTektronix service centeris located. Customer shall be,responsibl~ for payingallsl;tippiqgcharges,duties, taxes,
and any other charges for products returned to any 'other locations. ' · . '., · . ; · , ,
; < 'I I ' . .t ~-: )"J ~ 1 f. , ' ' ~ -
This warranty shall not apply to any,}iefec;t-, :failure or dam.age caused by jrnproper use or improper odnatiequate
maintenance and care. Tektronixshallnotbe obligated to furnish serviceungerthis warra,,qty a) to.repair dam/l,ge ~ulting
from attempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair
damage result_ing from_improper.t!se w p~:mne~tio~ to incompatib!e equipmerw or c) to Sfl~i~e a producqh~t,has be~m
modified or. integratdd with' qth'er pro~uc'ts ~h$n
1
tbe effect of such mociification orintegi:iHion increases the tiriiE) or
difficulty of servicing ibe product:"· '·- · 'r;, . · ' . ,! , ' • . • '' '·
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT.TO THlS J?RpDUCT IN LIEU OF ANY OTHER .
WARRANTIES, EXPRESS OR IMPLIED. TEKTRONX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX' RESPONSIBILITY TO REPAIR OR
REPLACE DEFECTIVE PRonucTs IS THE so LE AND EXCLusivE REMI!:ot PRavrnEn m Tirf! ·cus-foMn FOR
BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT,
SPECIAL, INCIDENTAL; OR CONSF:QlJENil'IAL'DAMAGES ;IRRESPECTIVE OF ·WHETHER TEKTRONIX OR THE
VENDORHAS~ADVANCENOlrlci: OF"THE'POSSIBILITY-OF·SUCHDAMAGES: .,1 r ,, ',.
' ' ·.: "."', ~ i ' .j .. ' ' ' ' 1

:,
(,..
,_,,.:,\
:r
l'!; iJ,,_;

Table of Contents
Table of Contents...........................................................................................i
Safety Sununary ......................................................................................... vii
Specifications
Product Description................................................................................... 1-1
User Interface .................................................................................. 1-1
Indicators.................................................................................... 1-1
Signal Acquisition System..............................................................1-2
Vertical Non-Storage Deflection System........................................1-3
Horizontal Display System ............................................................. 1-4
Horizontal Non-Storage Display System .................................. 1-4
Horizontal Storage Display System .......................................... 1-4
Triggering System............................................................................1-5
Setup ................................................................................................1-6
Cursor...............................................................................................1-6
Storage and I/O ................................................................................1-7
Display .............................................................................................1-7
Nominal Traits ..........................................................................................1-9
Warranted Characteristics......................................................................1-13
PerformanceConditions ..........................................................1-13
Typical Characteristics ...........................................................................1-27
OperatingInformation Using
this Manual .....................................................................................2-1
Before Servicing ..............................................................................2-1
Manual Structure ............................................................................2-1
Tektronix Service............................................................................2-2
Warranty Repair Service...........................................................2-2
Repair or Calibration Service ...................................................2-2
Finding Other Information .............................................................2-3
General Information .................................................................................2-5
Supplying Operating Power ...........................................................2-5
Power Cord Information............................................................2-6
Operating Voltage ......................................................................2-6
Operating Environment ..................................................................2-8
Operating Temperature .............................................................2-8
Ventilation Requirements ..........................................................2-8
2212 Service Manual j

Contents
Theory of Operation Overview..........'.........;..•..::.:.......................................................................3-1
Logic Conventions·;..........................................................................3-1
Overview of the Circuits .................................................................3-1
Main Board (Al0) ....................................................................... 3-1
· Power Bo,ard (All) ..................................................................... 3-2
Front Board (A12) ...................................................................... 3-2
DaculatorPiggyBack Board (A14) ...........................................3-2
Processor board '{A15) .......•......•.•.•................•......•••...•.•.••••....•...3-2
Serial Interface Board (A16) (Optional) ...................................3-2
General Purpose Interface Bus (GPIB) Board (A17)
·(Optional)........;...: ..... '..,'.·································································3-2
Block Diagrain ...........• '. ....;........~································································ 3-3
· Vertical Amplifiers .........................................................................3-3
Trigger and Ho'rizont3', Amplifiers ................................................3-3
Digital Storage ..... :.·;'.:.: ..................................................................... 3-4
Front Panel and System Control ....................................................3-5
High and LowVoltag'e Power Supply ............................................3-5
Z-axis ...............................................................................................3-5
Vertical ;........;......... ::.!.'..:: .. ~·~':· ... :.: ................. ..................................... 3-7
Vertical System............... ~; ..;:..................................................................... 3-7
Pre-Amplifier·;.................................................................................. 3-7
AttenuatorCircuit·...................................................................... 3-7
Storage Pick-offAmplifier U102 ............................................. 3-10
DC Balance ............................................................................... 3-10
. .
Probe Coding ..... !.'.~ ....... :::~.} ...................................................... 3-10
Delay Line Driver .......................................................................... 3-11
Vertical Output Amplifier ~ ...i;: .................................................... 3-11
Vertical Position Logic .................................................................. 3-11
Vertical Switch Logic ....................................................................3-12
Horizontal System and Z-Axis Circuit................................................... 3-13
Trigger Circuit ............................,..................................................3-14
·Sweep Logic Circuit ;:: ...... ~.:.'::; .. :.................................................... 3-14
Auto Cal and AUTO Setup ................................................ 3-15
Timebase Generator......................................................................3-15
Horizontal Magnifiers and Readout MUX ................................... 3-16
Z-Axis Circuit ................................................................................3-16
Serial Data Chain ......:................................................................... 3-18
DaculatorCircuit;.'......... :: .............................................................. 3-18
• • • • . '. j : f !. .4
Digital Circuitry....................... ,'. ...............................................................3-19
Microprocessor Circuit .. ~ ..............................................................3-19
Display System ......... '..· . .:':; .............................................................. 3-22
,.
ii
Contents

Performance
Verification
2212 Service Manual
Contents
Acquisition System ...............;.......................................................3-25
,,,. .. ., , Tµe, Acquisition Data ;Path•.....................................................3-25
f\/D Convf;}i:ters .- ..
1
·:·· ............................................................ 3-25
: ,-,Referen~ Voltage 1_ ............................................................... 3-25
,.Digital Acquisition Data Path .............................................. 3-26
R~~9rd ,Mode-Acquisition ...........................................•............3-27
1 ;4cquiring Record Mode Data..............................................3-27
F >~ , ,RE;cord Mod~ Data Transfer to 68070 ................................. 3-27
. .,..
1• Jloll;Mode Acquisition .............................................................3-28
r .. :,' · .. :-, Acquiring Rp_ll Mode Data .................................................. 3-28
, , ,~- , .. ·, Rqll Mod~ Dat<;1 Transfer to 68070 ......................................3-29
.:_Diagiiostic LED'~'.•.'. ... · .. ~~ ...................................................................3-29
Parallel Interface ...........................................................................3-29
Serial Interface Board A~6,(optional) .........................................3-30
,. GPIB Intei;face Uoard A17 (optional)...........................................3-30
,iii Front-Panel Controls .......•.............................................................3-31
Front Panel Switches ...............................................................3-31
,,Fre>nt Panel Potentiometers .....................................................3-31
.. ,;Front :Panel LED's .....................................................................3-32
Power ~upp~y ................•_,•~·····'.································································3-33
Mains Input ..............................................................................3-33
, Preregulat~r ..<t'"':(···-···································································3-33
.Series _Pass ·...,......... _: ....................................................................3-34
Inverter ......................................................................................3-34
.,,: :·D~ Outputs .,.: .....;......................................................................3-35
Video Qption ((!ptio_i;r05) :.......................................................................3-37
' ' ..7
Long.Rf!f;9td-Optl~p° (Option 1M) ...........................................................3-41
u~.~-~rr'?ceciures.~.-·~····,·'.·'.:,····~·······································································4-t
,. ,, :Conventions ....;_..............................................................................4-1
'· Initial Setup,Procedure ...................................................................4-2
.,,, Test Equip.m,ent Required ...............................................................4-2
Prep,aration ......................................................................................4-5
Limits and Tolerances .....................................................................4-5
I~dex to P~rform~ce Tests ............................................................4-6
Performance Tests .....................................................................................4-7
·· Vertical Checks ...............................................................................4-8
Horizontal Checks ......................................................................... 4-12
Triggering Checks ..........................................................................4-16
Probe Adjust Check .......................................................................4-22
X-Y Display Checks .......................................................................4-24
Video Triggering Checks...............................................................4-27
Revised 3/93 iii

Contents
Adjusbnent
Maintenance
iv
BriefProcedures ........................................................................................5-1
Initial Setup Procedure ...................................................................5-1
Test Equipment Required ...............................................................5-2
Preparation .........................................................•............................5-5
Limits. and Tolerances.....................................................................5-5
Index Calibration Procedures.........................................................5-6
Adjustment Procedures .; ...........................................................................5-7
Power Supply and CRT Display Adjustments..............................5-8
Check/adjust Power Supply DC levels (R1337) ........................5-9
Adjust Readout Jitter (R340) ....; .• ,............................................5-10
CRT Display Adjustment ..................................................•......5-10
Vertical Adjustments.....................................................................5-11
Adjust Balance .........................................................................5-12
Adjust Vertical Gain (R135, R185, R207, R209, and R1930) 5-12
Adjust Attenuator Compensation (AT100, AT150) ................5-13
Adjust High Frequency Compensation (R304, R305, R341,
and C304) ..................................................................................5-14
Trigger Adjustments......................................................................5-16
Adjust Trigger...........................................................................5-16
Horizontal Adjustments ................................................................5-18
AdjustHorizontal Magnifier Compensation (R671, R610) .... 5-18
Adjust Timing...........................................................................5-18
Adjust Magnifier Gain (R647, R627) .......................................5-19
Adjust High Speed Timing (Cno, C760) ................................5-19
Cursors Adjustments..•.................................................................5-20
Adjust Cursors............•.............................................................5-20
Video Trigger Adjustments (Option 05 only)...............................5-23
Maintenance Information .........................................................................6-1
Supplementary Information...........................................................6-1
Preventing ESD .....;...:.....................................................................6-2
Precautions.................................................................................6-2
Susceptibilityto ESD ..................................................................6-2
General Care....•...............................................................................6-5
Inspection and Cleaning Procedures .............................................6-5
Inspection and Cleaning ............................................................6-5
Inspection -Exterior ..................................................................6-6
Cleaning Procedure -Exterior...................................................6-6
Inspection - Interior ...................................................................6-7
Cleaning Procedure -Interior....................................................6-8
Lubrication .................................................................................6-8
Removal and Installation Procedures......................................................6-9
Procedures for Installation and Removal......................................6-9
Cabinet ........................................................................................6-9
Storage Board ...................................................;.......................6-10
Power Supply Board ................................................................6-10
Revised 3/93 Contents

Options & Accessories
Replaceable
Electrical Parts
Diagrams
2212 Service Manual
Contents
GPIB Board (Option 10 only) ..................................................6-12
RS-232-C Board (Option 12 only)............................................6-12
.Main Board...............................................................................6-12
Cathode-Ray Tube ....................................................................6-13
Front Panel Board ....................................................................6-14
Front Panel Assembly ..............................................................6-15
Transformer..............................................................................6-15
Fan Motor .................................................................................6-16
Power-On Extension Shaft.......................................................6-16
Options and Accessories ........................................................................... 7-1
· Options.............................................................................................7-2
Options Al -A5 International Power Cords ...................... 7-2
Warranty -Plus Service Options ........................................... 7-2
Option 3R -Rackmounted Instrument ................................. 7-3
Option 10 (GPIB) ................................................................... 7-3
Option 12 (RS-232-C) ............................................................ 7-3
Option 02 ............................................................................... 7-3
Option 05 (Video) .................................................................. 7-3
Option 1K .............................................................................. 7-3
Option 1M.............................................................................. 7-3
Option 1T ............................................................................... 7-3
Option 18 ............................................................................... 7-3
\;•~
.. .. Option 23 ............................................................................... 7-3
Standard Accessories...................................................................... 7-4
Optional Accessories....................................................................... 7-4
Replaceable Electrical Parts .....................................................................8-1
Parts Ordering Information............................................................8-1
,List·of.Assemblies.....................:......................................................8-1
·,.·. Cross Inde'l;(- .....................................................................................8-2
Mfr. Code Number to Manufacturer ..............................................8-2
Abbreviations ..................................................................................8-2
Electrical Parts List .........................................................................8-2
Cross Index -Mfr. Code Number to Manufacturer ....................... 8-4
Diagrams ....................................................................................................9-1
Symbols............................................................................................9-1
Component Values ..........................................................................9-1
Assembly numbers and Grid Coordinates....................................9-2
Revised 3/93 V

Contents
Replaceable PartsList Replaceable
Parts List .............................................................................10-1
Parts Ordering Information ...............................•..........................10-1
Using the Replaceable Parts List .......................•..........................10-1
Item Names...............................................................................10-1
Indentation System ..................................................................10-2
Abbreviations ...........................................................................10-2
Index
Change Information
vi
Contents

2212 Service Manual
Figure 1-1:
Figure 1-2:
Figure 3-1:
Figure 3-2:
Figure 3-3:
Figure 3-4:
Figure 3-5:
Figure 3-6:
Figure 3-7:
Figure 3-8:
Figure 3-9:
Figure 4-1
Figure 4-2
Figure 4-3
Figure 4-4
Figure 5-1:
Figure 5-2
Figure 5-3
Figure 5-4
Figure 5-5
Figure 5-6
Figure 9-1:
Figure 9-2:
Figure 9-3:
Figure 9-4:
Figure 9-5:
Figure 9-6:
Figure 9-7:
Figure 9-8:
Figure 9-9:
Figure 9-10:
Contents
List of Figures
Derating Curve for the EXT CLK Connector ....................
Derating Curve CHl, CH 2, and EXT OR Z Connectors.
Simplified 2212 Block Diagram .................................... ..
2212 Vertical System Block Diagram ..............................
2212 Horizontal System Block Diagram ..........................
2212 Z-Axis Block Diagram........................................... ..
68070 Micro Processor Block Diagram ............................
2212 Display System Block Diagram ...............................
2212 Acquisition Block Diagram .....................................
2212 Front Panel Block Diagram ................................... ..
Timing Diagram Comp Sync to Trigger Signal ................
TV Line 17 of Field 1 in the NTSC System .....................
TV Line 17 ofField 1 in the PAL System ........................
TV Line 17 of Field 2 in the NTSC System ................... ..
TV Line 17 ofField 2 in the PAL System ...................... ..
Attenuator Trimmer Layout .......................................... ..
TV Line 17 ofField 1 in the NTSC System .....................
TV Line 17 ofField 1 in the PAL System ...................... ..
TV Line 17 ofField 2 in the NTSC System .....................
TV Line 17 ofField 2 in the PAL System ...................... ..
Location ofVideo Controls ............................................ ..
Main Board (Al0)
Daculator Board (A14)
Power Board (Al 1)
Front Board (A12)
Processor Board (A15)
Serial Interface Board (A16)
GPIB Interface Board (Al 7)
Option 05 Video Board (A25)
Block Diagram 2212 Video Option (Option 05)
Option 1M Processor Board (A20)
Revised 3/93
1-19
1-19
3-4
3-8
3-13
3-17
3-20
3-22
3-26
3-32
3-39
4-29
4-29
4-30
4-30
5-14
5-25
5-25
5-26
5-26
5-28
vii

Contents
viii
Diagrams in Section 9:
Diagram 1: Vertical Preamplifier
Diagram 2: Position Switch and Delay Line Driver
Diagram 3: Vertical Outout Amplifier
Diagram 4: Trigger
Diagram 5A: Sweep Logic
Diagram 5B: Timebase
Diagram 6: Horizontal Magnifier and Readout Mux
Diagram 7: Horizontal Output Amplifier
Diagram 8: Mainboard Interface
Diagram 9: Mainboard Power
Diagram 10: Daculator Control Voltages
Diagram 12: Z-Axis and CRT Circuit
Diagram 13: Power Supply
Diagram 14: Front Switches
Diagram 15: Front LEDs
Diagram 16: Acquisition Circuit
Diagram 17: Clock and Timebase Circuit
Diagram 18: Processor and Memory Circuit
Diagram 19: Display System Circuit
Diagram 20A: Processor Board Power
Diagram 20B: Processor Board Power
Diagram 21: Communication Circuitry
Diagram 22: Serial Interface
Diagram 23: GPIB Interface
Diagram 24: Interconnecting Circuitry
Diagrams that go with the A25 board (Option 05 only)
Diagram 25:
Diagram 26:
Diagram 27:
TV Power Circuit
TV Analog Circuit
TV Digital Circuit
TV Block Diagram
Diagrams that go withthe A20 board (Option 1M only)
----------------- A20 board assy with look-up table for Diagram 16A
Diagram 16A: Acquisition Circuit
Diagram 16B: Acquisition Counters Circuit
Diagram 17: Clock and Timebase Circuit
Diagram 18: Processor and Memory Circuit
Diagram 19: Display System Circuit
Diagram 20A: Processor Board Power
Diagram 20B: Processor Board Power
Diagram 21: Communication Circuitry
Drawings in Section 10:
Figure 1: 2212 Exploded View (Metal Parts)
Figure 2: 2212 Exploded View (Cabinet and Plastic Parts)
Revised 3/93 Contents

Table 1-1:
Table 1-2:
Table 1-3:
Table 1-4:
Table 1-5:
Table 1-6:
Table 1-7:
Table 1-8:
Table 1-9:
Table 1-10:
Table 1-11:
Table 1-12:
Table 1-13:
Table 1-14:
Table 1-15:
Table 1-16:
Table 1-17:
Table 1-18:
Table 2-1:
Table 2-2:
Table 3-1:
Table 3-2:
Table 3-3:
Table 3-4:
Table 4-1:
Table 4-2:
Table 4-3:
Table 4-4:
Table 5-1:
Table 5-2:
Table 6-1:
Table 6-2:
Table 6-3:
Table 7-1:
Table 7-2:
Table 7-3:
Table 7-4:
Table 7-5:
Table 7-6:
Table 7-7:
Table 7-8:
Table 7-9:
2212 Service Manual
Contents
List ofTables
Nominal Traits -Vertical System ....................................
Nominal Traits- Horizontal System.................................
Nominal Traits -Triggering System .................................
Nominal Traits -Display System.....................................
Nominal Traits -Interfaces, Output Ports, and Power Fuse
Nominal Traits -Mechanical ...........................................
Warranted Characteristics -Vertical System ...................
Warranted Characteristics -Horizontal System...............
Warranted Characteristics -Triggering System ...............
Warranted Characteristics -Digital Storage System ...... ..
Warranted Characteristics -Readout Display System .....
Warranted Characteristics - X-Y Display System .......... ..
Warranted Characteristics -Probe Adjust Output ...........
Warranted Characteristics -Power Requirements ...........
Warranted Characteristics -Environmental, Safety and
Reliability ........................................................................
Typical Characteristics -Vertical System ...................... ..
Typical Characteristics -Horizontal System ...................
Typical Characteristics -Triggering System ....................
Power Cord Conductor Identification ........................... ..
Power Cord and Plug Identification .............................. ..
Attenuation Factors vs. Logic Levels ............................. ..
Readout Control Table................................................... ..
Timebase Table ...............................................................
Acquisition Chain Record-Length Programming Table .. .
Test Equipment Required................................................
Deflection Accuracy Limits .............................................
Settings for Timing Accuracy Checks ........................... ..
Switch Combinations for Triggering Checks ................. ..
TestEquipment Required.............................................. ..
Power Supply Limits ........................·...............................
Relative Susceptibility to Static-Discharge Damage ........
External Inspection Check List ........................................
Internal Inspection Check List.........................................
Power Cord Options ...................................................... ..
Standard Accessories .................................................... ..
Instrument Enhancements............................................. ..
Viewing Hoods ................................................................
Fuses ...............................................................................
Voltage Probes ............................................................... ..
Current Probes .................................................................
Oscilloscope Cameras.................................................... ..
Printers/Plotters...............................................................
Revised 3/93
1-9
1-10
1-10
1-10
1-11
1-11
1-14
1-15
1-16
1-20
1-21
1-23
1-24
1-24
1-25
1-28
1-30
1-31
2-6
2-7
3-9
3-24
3-28
3-42
4-3
4-9
4-15
4-17
5-3
5-9
6-3
6-6
6-7
7-2
7-4
7-4
7-5
7-5
7-5
7-6
7-6
7-6
ix

Contents
X
Table 9-1:
Component Reference Chart:
Table 9- 2:
Component Reference Chart:
Table 9- 3: Component Reference Chart:
Table 9- 4: Component Reference Chart:
Table 9- 5A: Component Reference Chart:
Table 9- 5B: Component Reference Chart:
Table 9- 6: Component Reference Chart:
Table 9- 7: Component Reference Chart:
Table 9- 8:
Component Reference Chart:
Table 9- 9:
Component Reference Chart:
Table 9-10: Component Reference Chart:
Table 9-12: Component Reference Chart:
Table 9-13: Component Reference Chart:
Table 9-14: Component Reference Chart:
Table 9-15: Component Reference Chart:
Table 9- 16: Component Reference Chart:
Table 9-17: Component Reference Chart:
Table 9-18: Component Reference Chart:
Table 9-19: Component Reference Chart:
Table 9- 20A: Component Reference Chart:
Table 9- 20B: Component Reference Chart:
Table 9- 21: Component Reference Chart:
Table 9- 22: Component Reference Chart:
Table 9- 23: Component Reference Chart:
Vertical Preamplifier
Position Switch &Delay L. Driver
Vertical Outout Amplifier
Trigger
Sweep Logic
Timebase
Horizontal Magn. &Readout Mux
Horizontal Output Amplifier
Mainboard Interface
Mainboard Power
Daculator Control Voltages
Z-Axis and CRT Circuit
Power Supply
Front Switches
Front LEDs
Acquisition Circuit
Clock and Timebase Circuit
Processor and Memory Circuit
Display System Circuit
Processor Board Power
Processor Board Power
Communication Circuitry
Serial Interface
GPIB Interface
Tables that go with Video Board (A25) of Option 05
Table 9- 25:
Table 9- 26:
Table 9- 27:
Component Reference Chart:
Component Reference Chart:
Component Reference Chart:
TV Power Circuit
TV Analog Circuit
TV Digital Circuit
Tables that go withProcessor Board (A20) of Option tM:
Table 9-16A: Component Reference Chart: Acquisition Circuit
Table 9-16B: Component Reference Chart: Acquisition Counters Circuit
Table 9- 17: Component Reference Chart: Clock and Timebase Circuit
Table 9-18: Component Reference Chart: Processor and Memory Circuit
Table 9- 19: Component Reference Chart: Display System Circuit
Table 9- 20A: Component Reference Chart: Processor Board Power
Table 9- 20B: Component Reference Chart: Processor Board Power
Table 9- 21: Component Reference Chart: Communication Circuitry
Revised 3/93 Contents

Symbols and Terms
2212 Service Manual
SafetySummary
Please take a moment to review these safety precautions. They are provided for
your protection and to prevent damage to the 2212 Oscilloscope. This safety
information applies to all operators and service personnel.
These two terms appear in manuals:
• ~ statem_ents identify conditi~ns or practices that could
result m damage to the eqmpment or other property.
• I,wARNiNG • statements identify conditions or practices that could
result in personal injury or loss oflife.
These two terms appear on equipment:
• CAUTION
• DANGER
indicates a personal injury hazard not immediately
accessible as one reads the marking, or a hazard to
property including the equipment itself.
indicates a personal injury hazard immediately
accessible as one reads the marking.
This symbol appears in manuals: ®
Static-SensitiveDevices
These symbols appear on equipment:
DANGER
High Voltage
@
Protective
ground (earth)
terminal
ATTENTION
Refer to
manual
xi

Contents
SpecificPrecautions
xii
Observe all ofthe following precautions to ensure your personal safety and
to prevent damage to either the 2212 Oscilloscope or equipment connected
to it.
Do Not Perform Service While Alone
Do not perform internal service or adjustment ofthis product unless an-
other person capable ofrendering first aid and resuscitation is present.
Use Care when Servicing with Power On
Dangerous voltages exist at several points in this product. To avoid personal
injury, do not touch exposed connections or components while power is
on. Disconnect power before removing protective panels, soldering, or
replacing components.
Power Source
The 2212 Oscilloscope is intended to operate from a power source that will
not apply more than 250 Vrms between the supply conductors or between
either supplyconductor and ground. A protective ground connection,
through the grounding conductor in the power cord, is essential for safe
system operation.
Grounding the Oscilloscope
The 2212 Oscilloscope is grounded through the power cord. To avoid
electric shock, plug the power cord into a properly wired receptacle where
earth ground has been verified by a qualified service person. Do this before
making connections to the input or output terminals of the 2212 Oscillo-
scope.
Without the protective ground connection, all parts ofthe 2212 Oscillo-
scope are potential shock hazards. This includes knobs and controls that
may appear to be insulators.
Use the Proper Power Cord
Use onlythe power cord and connector specified for your product. Use
only a power cord that is in good condition.
Use the Proper Fuse
To avoid fire hazard, use only the fuse specified in the parts list for your
product, and which is identical in type, voltage rating, and current rating.
Contents

2212 Service Manual
Contents
Do Not Remove Covers or Panels
To avoid personal injury, do not operate the 2212 Oscilloscope without the
panels or covers.
Do Not Operate in Explosive Atmospheres
The 2212 Oscilloscope provides no explosion protection from static discharges
or arcing components. Do not operate the 2212 Oscilloscope in an atmosphere of
explosive gasses.
Electric Overload
Never apply a voltage to a connector on the 2212 Oscilloscope that is outside the
range specified for that connector.
xiii

xiv
Contents

Userfuterface
2212 Service Manual
ProductDescription
This subsection begins with a general description of the traits of the 2212
oscilloscope. Three subsections follow, one for each ofthe three classes of
characteristics: nominal traits, warranted characteristics, and typical charac-
teristics.
This oscilloscope uses the front-panel buttons and knobs to control its many
functions. The front-panel controls are grouped according to function:
vertical, horizontal, trigger, cursor, setup, and storage. The controls just to the
right of the crt screen are called the display group. Within each group, the
functions are set directly by their own front-panel knob.
When Option 10 (GPIB) and/or Option 12 (RS-232-C) are included most
functions of the oscilloscope can be operated externally by a controller (PC).
Indicators
Several on-screen readouts help you keep track ofthe settings for various
functions, such as vertical and horizontal scale and trigger level. There are
also crt readouts to display the results ofmeasurements, using cursors.
1 -1

Product Description
SignalAcquisition
System
1-2
In (Digital) Storage mode, the signal acquisition system provides two
vertical channels with calibrated vertical scale factors from
20 mV thru 50 V with a 10X probe (P6109), and 2 mV thru 5 V per
division with a 1X probe P6101A (optional). Both channels can be
acquired simultaneously. The vertical channels have a bandwidth of
± 10 MHz in Store mode.
Each of the two channels can be displayed, scaled and vertically
positioned and have their vertical coupling specified. Channel 2 can
also be inverted.
Besides the two channels, up to two stored waveforms are available for
display.
With the VARiable VOL TS/DIV gain control (VAR) you can increase the
deflection factor to overlap the next VOL TS/DIV setting.
You can select the following display modes:
CH 1, ADD, ALT, CHOP, X-Y or CH 2.
In CH 1 or CH 2 mode, only the signal applied to the CH 1
OR Xinput connector or to the CH 2 OR Y input connector is
displayed on the crt screen.
In ALTernate mode, the display switches between CH 1 and
CH 2 at the end of each sweep, showing the signals applied
to each channel alternately.
In CHOPped mode, the display switches between CH 1 and
CH 2 at a rate of±500 kHz as the sweep is occurring to
display both channels simultaneously on the crt.
In ADDed mode, the signals applied to the CH 1 OR X input
connector and the CH 2 OR Y input connector are algebrai-
cally added.
In the X-Y Store mode, the acquisition and the sampling
rate are set by the SEC/DIV switch and/or the EXT CLOCK.
The signal connected to the CH 1 OR X connectoris
switched to the horizontal deflection and the signal con-
nected to the CH 2 OR Yconnector to the vertical deflection.
Ifthe ADD, ALT or CHOP mode is selected in Store mode, the signals
applied to the vertical input connectors are acquired similtaneously.
However, if the vertical mode is in ALT and the trigger source is in VERT
MODE, CH 1 and CH 2 will be digitized alternately.
Specifications