Tektronix 11A34 User's Manual
Contents
1. Coarse 0 25 div Fine 0 025 div BWHI lt NRx gt HF Limit 24E6 20E6 gt 24E6 to 120E6 100E6 gt 120E6 250E6 11301 250E6 11302 IMPEDANCE lt NRx gt Impedance lt 1E3 50 21E3 1E6 SENSITIVITY Sensitivity Resolution step size 1E 3 to 1 99E 3 10E 6 2E 3 to 4 98E 3 20E 6 5E 3 to 9 95E 3 50E 6 10E 3 to 19 9E 3 100E 6 20E 3 to 49 8E 3 200E 6 50E 3 to 99 5E 3 500E 6 100E 3 to 199E 3 1E 3 200E 3 to 498E 3 2E 3 500E 3 to 995E 3 5E 3 1to 1 99 10E 3 2 to 498 20E 3 5 to 10 50E 3 UNITS lt qstring gt query only The 11A34 answers a Units query with a units status message which indicates the units of conversion of a probe connected to its Ch N input The numbers listed are those available at the input connectors Connecting an attenuating probe will change the value by the probe attenuating factor e g a 10X probe will change the value 10 to 100 11A34 User Reference Supplement Header CH lt L1 L2 C1 C2 Ri or R2 gt cont Legend CH lt L1 L2 C1 C2 R1 or R2 gt COUPLING OFFSET BWHI NRx IMPEDANCE SENSITIVITY qstring 11A34 User Reference Supplement Operating the 11A34 in 11300 series mainframes Table 2 2 cont Channel Parameter Commands for 11300 series Oscilloscopes Link Argument PROBE lt gstring gt query only This query only link returns a quoted string indicating what type of probe is connected to the input If a Level 1 TEKPROBE is connected t2. Packaging for Shipment If this instrument is to be shipped by commercial transportation we recommend that it be packaged in the original manner The original carton and packaging material should be saved and reused for this purpose NOTE Package and ship plug in units and mainframes separately If the 11A34 is to be shipped to a Tektronix Service Center for service or repair attach a tag to the instrument On the tag include the following information e Name and address of the instrument owner Name of a person at your firm who can be contacted about the instrument e Complete instrument type and serial number and A description of the service required If the original package is not available or is not fit for use package the 11A34 as follows 1 Obtain a corrugated cardboard carton with inside dimensions at least six inches greater than the instrument dimensions Use a carton with a test strength of at least 200 pounds 2 Fully wrap the 11A34 with anti static sheeting or its equivalent to protect the finish 3 Cushion the 11A34 on all sides by tightly packing dunnage or urethane foam between the carton and the instrument Allow three inches of packing on each side 4 Seal the carton with shipping tape or with industrial staples 5 Mark the address of the Tektronix Service Center and your return address on the carton in one or more prominent places 11A34 User Reference Supplement 1 5 General Informati
3. 11A34 User Reference Supplement 3 5 Operating the 11A34 in 11400 series Mainframes Cursors Window gaon Figure 3 2 Overdrive recovery using short top and long bottom cables terminated in 50 Q Traces are offset two divisions and the illustration is a composite of two waveforms 3 6 11A34 User Reference Supplement Operating the 11A34 in 11400 series Mainframes 3 275mV Ins div Main Pos 58 Figure 3 3 Overdrive recovery using short top and long bottom cables unterminated Traces are offset two divisions and the illustration is a composite of two waveforms 11434 User Reference Supplement 3 7 Operating the 11A34 in 11400 series Mainframes 50 Q Overload When the input impedance is set to 50 Q and the input voltage substantially exceeds 5 Vrms the 11434 will sense the overload disconnect the 50 Q input termination and connect the 1 MQ termination The Impedance menu will show 1 MQ and the mainframe will display the message input channel N overload on LEFT CENTER RIGHT plug in where N 1 or 2 select 50 Q from the Impedance menu Active Probes Probe ID 3 8 Using an active probe such as the P6231 eliminates two options AC Coupling and 1 MQ input impedance Coupling options available when using such a probe are Off and DC the only Impedance available is 50 Q The Probe ID function is the means of selecting how the 11401 or 11402 responds to an ID button push of recommended pro
4. 1Vto10V 0 25 50 mV With P6134 Probe calibrated from 11300 series Mainframe Calibrator output Volts Div AV DC Acc DC Balance DC Offset Acc 10 mV to 995 mV 1 0 0 04 div 112 mV 0 13 div 0 25 5 mV TVto9 95V 1 0 0 04 div 120 mV 0 13 div 0 25 50 mV 10 V to 100 V 1 0 0 04 div 1 2 V 0 13 div 0 25 0 5 V na Probe tip TC term 100 ppm C For absolute DC accuracy of single point measurements using Offset add the DC Offset Accuracy DC Balance and AV DC Accuracy terms Apply the AV DC Accuracy only to the difference between the Vertical Position setting and the measurement point 11A34 User Reference Supplement 4 1 Specification Circuit Display Deflection Factor Sensitivity cont Characteristic Volts Div AV DC Acc TABLE 4 1 cont Electrical Characteristics Performance Requirement With P6231 Probe calibrated from 11300 series Mainframe Calibration output Volts Div AV DC Acc pc Balance DC Offset Acc 10 mV to 995 mV 1 1 0 04 div 10 mV 0 13 div 0 20 2 mV 21 V 1 1 0 04 div 100 mV 0 13 div 0 20 2 mV Probe Tip TC term 100 ppm C Enhanced DC Accuracy either polarity any BW Limit of 11A34 in 11401 and 11402 mainframes Without Probes Volts Div AV DC Acc DC Balance DC Offset Acc 1mV to 99 5 mV 0 9 0 012 div 1 mV 0 10 div 0 20 0 50 mV 100 mV to 995 mV 0 9 0 012 d
5. 3 ns High Frequency 3 dB point 100 MHz Limit 100 MHz 30 20 MHz Limit 20 MHz 30 Low Frequency 3 dB point 10 Hz maximum AC coupled Display Trig and Auxiliary signals 4 4 11A34 User Reference Supplement Specification TABLE 4 1 cont Electrical Characteristics Circuit Characteristic Inp ut Maximum Input Voltage DC Coupled Z 1 MQ Maximum Input Voltage AC Coupled Z 1 MQ Maximum Input Voltage AC or DC Coupled Z 50 Q Input Disconnect Threshold Input Impedance 50 22 DC coupled Input Impedance 1 MQ DC coupled Input Impedance 1 MQ AC coupled Performance Requirement 500 V DC peak AC Derate at 20 dB per decade from 1 MHz to 5 0 V at 100 MHz 500 V DC peak AC Derate at 20 dB per decade from 1 MHz to 5 0 V at 100 MHz 5 Vrms 0 5 W or 0 5 watt second pulses not exceeding 25 V peak 5 Vrms minimum 50 Q within 1 2 VSWR less than 1 25 1 for V div lt 1 V VSWR less than 1 3 1 for V div from 1 V to 10 V DC to 350 MHz 1 MQ within 1 2 in parallel with approximately 15 pF 1 MQ within 1 2 in series with 0 022 uF and in parallel with approximately 15 pF Input Bias Current 0 to 30 C Less than 100 pA 11A34 User Reference Supplement 4 5 Specification Circuit Miscellaneous TABLE 4 1 cont Electrical Characteristics Characteristic Performance Requirement Overdrive Recovery Time 1 mV to
6. Functions and Where They are Described nee 3 1 Channel Parameter Commands for 11400 series oscilloscopes 3 11 Electrical Characteristics assente edenis 4 1 Environmental Characteristics sss csisvacisasscossstenespeccsesubecdunsasiyiecsibasenandsaalanedliaoes 4 7 Physical Character deden natiestaten 4 8 11A34 User Reference Supplement Section 1 General Information This Supplement to the mainframe User Reference manual and the Incoming Inspection Procedure manual are standard accessories to the 11A34 For a list of related manuals see Appendix B Contents of this Supplement This Supplement contains the following four sections Section 1 GENERAL INFORMATION describes mainframe to plug in unit compatibility explains how to install and remove the 11A34 from a mainframe outlines any options available for the 11A34 and gives details about packaging for shipment Most 11A34 functions and their use are described in the Operating Information section of the mainframe User Reference manuals These functions are those common to all amplifier plug in units Examples of common functions are offset sensitivity input impedance where selectable coupling and bandwidth limit Only functions unique to the 11A34 11300 series or 11A34 11400 series combinations are explained in the following sections Section 2 OPERATING THE 11A34 IN 11300 SERIES MAINFRAMES explains how to operate those 11A34 functions not covered in the 113
7. and RS 232 C interfaces are included here or The 11301A and 11302A User Reference Manual contains detailed information about measurements the instruments can make and instructions about how to set the oscilloscope to perform such measurements Also installation instructions specifications description of options and details about using the 11301A and 11302A with the GPIB and RS 232 C interfaces are included here The 11401 and 11402 User Reference Manual contains detailed information about measurements the instruments can make and instructions about how to set the oscilloscope to perform such measurements Also installation instructions specifications description of options and details about using the 11401 and 11402 with the GPIB and RS 232 C interfaces are included here s The 11301 and 11302 Pocket Reference is a short form reference The Pocket Reference gives menus and a brief description of functions selected External interface commands are listed with their basic syntax and a list of error and warning messages is included or The 11301A and 11302A Pocket Reference is a short form reference The Pocket Reference gives menus and a brief description of functions selected External interface commands are listed with their basic syntax and a list of error and warning messages is included e The 11A34 Service Manual includes information needed to check and adjust perform diagnostic troubleshooting repair and otherwise s
8. command which does not apply to compound waveforms Quoted string data 11A34 User Reference Supplement Section 4 Specification Performance The specifications that follow apply when the instrument is in the condition of Conditions Enhanced Accuracy Enhanced Accuracy is initiated by pushing the E A button on the specific host mainframe after the system has reached thermal equilibrium which requires 20 minutes warmup Enhanced Accuracy is indicated on the CRT display and remains in effect as long as the mainframe internal temperature change is less than 5 C from the temperature at which the calibration was performed When the 5 C change does occur the accuracy condition becomes Not Enhanced In the Not Enhanced condition those Characteristics that are temperature sensitive may not remain within the limits of these specifications The instrument specifications are valid at an ambient temperature of 0 to 50 C unless otherwise stated TABLE 4 1 Electrical Characteristics Circuit Characteristic Performance Requirement Display Calibrated Range 1 mV to 10 V div Deflection Factor Sensitivity Enhanced DC Accuracy either polarity any HF Limit of 11A32 in 11300 Series mainframes with on screen cursors Without Probes AV DC Ace DC Balance 1 0 0 04 div 100 mV 0 13 div Volts Div DC Offset Acc 1 mV to 99 5 mV 0 20 0 50 mV 100 mV to 995 mV 0 25 5 mV
9. interrupt to the GPIB and RS 232 C can be generated Pressing a probe ID button will cause the mainframe to produce an SRQ to the GPIB and RS 232 C For more information refer to the GPIB RS 232 C section of the 11301 and 11302 User Reference manual or the 11301A and 11302A User Reference Manual Front Panel Error Messages Message Internal DAC overflow on channel N of LEFT CENTER or RIGHT plug in unit where N 1 or 2 Cause Some plug in unit detected that a requested setting overflowed an internal DAC Such overflow usually indicates defective hardware In this situation the plug in unit sets the DAC to the limit nearer the requested setting Message Bad Level 2 probe checksum on channel N of LEFT CENTER or RIGHT plug in unit where N 1 or 2 Cause Some plug in unit detected that a Level 2 TEKPROBE had failed or been improperly connected 11A34 User Reference Supplement 2 9 ra Operating the 11A34 in 11300 series mainframes GPIB and RS 232 C Commands and Syntax The following commands set parameters of a specified channel 2 10 TABLE 2 2 Channel Parameter Commands for 11300 series Oscilloscopes Header Link Argument CH lt L1 L2 C1 COUPLING ACIDC OFF C2 R1 or R2 gt OFFSET lt NRx gt Resolution Step Size Volts div Offset via RS 232 C GPIB via front panel Range or Numeric Entry Control knob 1 mV to 99 5 mV 1 V 100 mV to 995 mV 10 V 1 Vto 10 V 100 V
10. set to ON applies operating power to all circuits When set to STANDBY the mainframe DC power supply supplies power to the counter timer crystal oven Option 1T A condition in which amplifiers are driven into a non linear operating range Typically many divisions off screen The condition existing when a potentially damaging voltage is applied to the input connector To switch alternately between two functions e g on and off 11A34 User Reference Supplement A 1 Appendix Pre messe A 2 11A34 User Reference Supplement Appendix B Instrument _ Documentation o Introducing the 11301 and 11302 Programmable Oscilloscopes This book helps the new user learn the concepts and operation of the 11301 and 11302 programmable oscilloscopes or Introducing the 11301A and 11302A Counter Timer Oscilloscopes This book helps the new user learn the concepts and operation of the 11301A and 11302A counter timer oscilloscopes e Introducing the 11401 and 11402 Digitizing Oscilloscopes Intended for new users this book explains the concepts and operation of the 11401 and 11402 digitizing oscilloscopes e The 11301 and 11302 User Reference Manual contains detailed information about measurements the instruments can make and instructions about how to set the oscilloscope to perform such measurements Also installation instructions specifications description of options and details about using the 11301 and 11302 with the GPIB
11. settle to within a stated fraction of the equilibrium value is its overdrive recovery time Measuring the overdrive recovery time of an 11A34 takes some care and can lead to some surprising results An interesting experiment is to use a very flat pulse generator such as the Tektronix PG 506 to pulse the 11A34 Connect the generators fast rise output to the 11A34 input through a short one foot or less coaxial cable and select 50 Q input impedance Adjust the pulse amplitude to 1 volt Set the 11A34 sensitivity to 1 mV division Each division now represents 0 1 of the input signal Trigger the oscilloscope and observe the recovery of the 11A34 using 50 ns division sweep rate Now increase the cable length by about three feet for example use a 42 inch length of RG 58 cable Tektronix part 012 0057 01 and observe the new waveform See Figure 2 2 11A34 User Reference Supplement 2 5 Operating the 11A34 in 11300 series mainframes C5922 201 Figure 2 2 Overdrive recovery using long top and short bottom cables terminated in 50 Q Traces are offset two divisions and the photograph is adouble exposure The waveform change is due to skin effect loss in the longer cable What is Surprising is that the skin effect loss persists for over 200 ns even though the total cable delay is only 5 ns At 400 ns the loss is still 0 02 This experiment shows the importance of using a short cable to test overdrive recovery second sur
12. 01 and 11302 User Reference Manual or the 11301A and 11302A User Reference Manual Section 3 OPERATING THE 11A34 IN 11400 SERIES MAINFRAMES explains how to operate those 11A34 functions not covered in the 11401 and 11402 User Reference Manual Section 4 SPECIFICATION gives detailed specifications of all 11A34 mainframe oscilloscope combinations ee tet gees at ot ee 11A34 User Reference Supplement 1 1 General Information 11A34 Service Manual The 11A34 Service manual is for use by qualified service personnel only To avoid personal injury do not perform any service other than that contained in the Operator s manual unless you are qualified to do so Refer to the Operators Safety Summary and Service Safety Summary before performing any service The 11434 Service Manual contains the following information Section 1 GENERAL INFORMATION Section 2 THEORY OF OPERATION Section 3 MAINTENANCE AND DIAGNOSTICS Section 4 PERFORMANCE VERIFICATION AND ADJUSTMENT Section 5 INSTRUMENT OPTIONS Section 6 REPLACEABLE ELECTRICAL PARTS Section 7 SCHEMATIC DIAGRAMS amp CIRCUIT BOARD ILLUSTRATIONS Section 8 REPLACEABLE MECHANICAL PARTS Plug in to Mainframe Compatibility The 11A34 is designed for use in the 11301 11301A 11302 11302A 11401 11402 and future 11000 series plug in mainframes 11A34 bandwidth varies depending on the host mainframe Details about bandwidth are included in Section 4 Specif
13. 34 TABLE 2 1 Functions and Where They are Described Function Described Under Heading Offset Waveform Acquisition Vertical Menu Size V div or for X Y Display Horizontal Menu Display Ch 1 Ch 2 Waveform Acquisition Vertical Menu Polarity Waveform Acquisition Waveform Menu Trigger Selection Trigger Source Major Menu and Polarity Position and Offset 2 2 All 11300 series oscilloscopes assign position control to the Left Control knob by pressing the VERTICAL POSition button once The Vertical Position control moves the trace as a user convenience For example when displaying multiple channels it may be desirable to set ground references for each trace on separate graticule lines Position is a screen related function its units are divisions The offset function accessed by pressing the VERTICAL OFFSET button subtracts a precision voltage from the input signal Changing offset moves the trace just as does the position control However if the deflection factor is subsequently changed the effect is different Changing the sensitivity will increase or decrease the size of the display around some screen level e g two divisions above graticule center set by the Position control When using a sensitivity that makes the displayed waveform larger than the screen the Offset control is used to bring the waveform area of interest to the screen location established by the Position control The Position control has a range
14. 99 5 mV div 100 mV to 995 mV div 1 0 V to 10 0 V div Typical Noise 1 0 mV to 1 99 mV div 2 0 mV to 4 98 mV div 5 0 mV to 9 95 mV div 10 0 mV to 99 5 mV div 100 mV to 995 mV div 1 0 Vto 10 0 V div DC Drift with Temperature Channel Isolation Common Mode Rejection Ratio Probe Compatibility lt 50 ns to 0 3 0 2 div for Vin of lt 2 0 V lt 50 ns to 1 0 for Vin of lt 20 V lt 50 ns to 1 0 for Vin of lt 200 V 0 12 div rms 0 06 div rms 0 025 div rms 0 014 div rms 0 014 div rms 0 014 div rms 200 uV C or less at any sensitivity At least 50 1 display ratio DC 300 MHz At least 20 1 DC to 50 MHz 10 div reference signal on each input The 11A34 is compatible with Level 1 and Level 2 TEKPROBEs DC drift can be calibrated out by invoking a calibration Enhanced Accuracy at any specific operating temperature Display ratio Amplitude div x V div driven channel Error amplitude div x V div undriven channel TEKPROBE is Tektronix name for the interface used with probes designed for the 11000 series of oscilloscopes and plug in units TEKPROBEs have output connectors with one or more spring loaded coding pins Two categories of TEKPROBEs are Level 1 A level 1 probe which uses analog encoding to indicate the probe s scale factor to the plug in unit Level 2 A level 2 probe which uses an EEPROM to store data about the probe s transfer units scal
15. TE K User Reference Part No 070 5921 01 Supplement Product Group 47 11A34 Four Channel Amplifier Serial Number Please check for CHANGE INFORMATION at the rear of this manual Second Edition SEP 1988 Revised NOV 1988 Tektronix COMMITTED TO EXCELLENCE INSTRUMENT SERIAL NUMBERS Each instrument has a serial number on a panel insert tag or stamped on the chassis The first number or letter designates the country of manufacture The last five digits of the serial number are assigned sequen tially and are unique to each instrument Those manufactured in the United States have six unique digits The country of manufacture is identified as follows B000000 Tektronix Inc Beaverton Oregon USA 100000 Tektronix Guernsey Ltd Channel Islands 200000 Tektronix United Kingdom Ltd London 300000 Sony Tektronix Japan 700000 Tektronix Holland NV Heerenveen The Netherlands Copyright Tektronix Inc 1987 1988 All rights reserved Tektronix products are covered by U S and foreign patents issued and pending TEKTRONIX INC SCOPEMOBILE and Kar are registered trademarks Printed in U S A 11A34 Features and Functions Features Dual trace Up to 300 MHz bandwidth in 11402 Calibrated sensitivities from 1 mV to 10 V division 50 Q or 1 MQ input impedance High resolution calibrated DC offset 0 25 division increment coarse 0 025 division increment fine Fast overdrive recovery Functions Signals appli
16. User Reference Supplement HI Contents Appendix A Glossary Appendix B Instrument Documentation Illustrations 1 1 2 1 2 2 2 3 3 4 4 1 Tables 2 1 2 2 3 1 3 2 4 1 4 2 4 3 Installing a plug in unit in a mainframe oscilloscope soeren 1 4 Location of AC coupling capacitors in plug in amplifiers cesses 2 3 Overdrive recovery using long top and short bottom cables terminated in 50 Q Traces are offset two divisions and the photograph is a double exposure inner 2 6 Overdrive recovery using long top and short bottom cables unterminated Traces are offset two divisions and the photograph is a double Exposure siscciscsssdassccscsasesssovsessaenciseassascaviogvssskissedenvaan 2 7 Location of AC coupling capacitors in plug in amplifiers nn 3 3 Overdrive recovery using short top and long bottom cables terminated in 50 Q Traces are offset two divisions and the illustration is a composite of two waveforms ss 3 6 Overdrive recovery using short top and long bottom cables unterminated Traces are offset two divisions and the illustration is a composite of two waveforms is ad Sequence of decisions used to select i a new waveform ir in 1 response to probe ID DUON isinisi RE Ramadan 3 9 Dimensions of ASE vooreen aas annde arten eenen ets 4 9 Functions and Where They are Described ren 2 2 Channel Parameter Commands for 11300 series oscilloscopes 2 10
17. a units status message which indicates the units of conversion of a probe connected to its Ch N 1The numbers listed are those available at the input connectors Connecting an attenuating probe will change the value by the probe attenuating factor e g a 10X probe will change the value 10 to 100 11A34 User Reference Supplement 3 11 Operating the 11A34 in 11400 series Mainframes Header CH lt L1 L2 C1 C2 R1 or R2 gt Legend CH lt L1 L2 Cl C2 R1 or R2 gt COUPLING OFFSET BW NRx IMPEDANCE SENSITIVITY qstring 3 12 Table 3 2 cont Channel Parameter Commands for 11400 series Oscilloscopes lt qstring gt query only This query only link returns a quoted string indicating what type of probe is connected to the input If a Level 1 TEKPROBE is connected the query response is Level 1 If a Level 2 TEKPROBE is connected the query response is Level 2 lt probe_type gt lt serial_number gt When neither Level 1 nor Level 2 TEKPROBE is connected the query response is NONE L C and R mean Left Center and Right plug in compartments 1 and 2 mean Channel 1 and Channel 2 Sets the specified channel input coupling Sets the specified channel offset Sets the HF Limit bandwidth of the specified channel Numeric representation Sets the input impedance of the specified channel Sets the deflection factor of the specified channel Sensitivity is a channel specific
18. able and select 50 Q input impedance Adjust the pulse amplitude to 1 volt Set the 11A34 sensitivity to 1 mV division Each division now represents 0 1 of the input signal Trigger the oscilloscope and observe the recovery of the 11A34 using 50 ns division sweep rate Now increase the cable length by about three feet for example use a 42 inch length of RG 58 cable Tektronix part 012 0057 01 and observe the new waveform See Figure 3 2 The waveform change is due to skin effect loss in the longer cable What is surprising is that the skin effect loss persists for over 200 ns even though the total cable delay is only 5 ns At 400 ns the loss is still 0 02 This experiment shows the importance of using a short cable to test overdrive recovery A second surprise is that skin effect loss disappears almost completely after two cable delays when one end is unterminated To observe this use the short cable again and select 1 MQ input impedance on the 11A34 Insert a 2X attenuator between the cable and the pulse generator to improve the reverse termination and to provide the same amplitude signal as before Observe the response and change cables again Even at 0 1 per division the skin effect loss is hard to detect without the forward termination The reason for this is that the skin effect loss is an increase in the effective series resistance of the cable Without current the cable develops no series voltage drop See Figure 3 3 ede a
19. als to be added or subtracted be selected from different plug in compartments The best common mode rejection is obtained with a differential amplifier plug in unit because its hardware subtracts the signals at its two inputs passing only the result to the mainframe Even when using channels from different plug in compartments the following two problems limit the accuracy of sums or differences 1 Each waveform in memory is constantly being updated and therefore consists of some points that are older than others Although samples may be taken simultaneously there is a chance that a correct sample may be replaced in memory with a newer value before the waveform is processed and displayed 2 Delay differences between channels of different plug in units due to probe cable length differences are normally removed by deskewing the probes and the associated amplifier channel Samples are still taken simultan eously but the display is manipulated to remove time differences Signals correlated to the trigger signal are correctly restored to their proper time relationship but there is no way for signals unrelated to the trigger to be corrected with this deskewing technique High frequency rejection of signals unrelated to the trigger is not improved by deskewing The solution to both problems is to invoke averaging The averaging process suppresses all signals and noise unrelated to the trigger 11A34 User Reference Supplement Operating th
20. and Where They are Described Function Described under Heading Vertical Offset Vertical Size and Position Vertical Size sensitivity Vertical Size and Position Couptine AC DC Off Selecting Channel Coupling Select 11A34 Channel Displaying Waveforms an alternative to pressing the 11A34 display on off button Input Impedance Selecting Channel Input Impedance Offset Vertical Position BW Limit Selecting Channel Bandwidth Limit Display Polarity Vertical Description En Under Waveform Control in Section 2 Operating Information 11A34 User Reference Supplement 3 1 Operating the 11A34 in 11400 series Mainframes Vertical Offset BW Limit 3 2 The 11401 and 11402 oscilloscopes use offset to position the trace on the screen In YT signal vs time mode offset determines vertical position but when a plug in unit provides the X component of an XY display offset controls horizontal position Offset is an input signal related control and its units are those of the input signal usually volts Offset subtracts a precision voltage from the input signal To access the offset function touch the double ended arrow at the left edge of the screen Control of offset is then assigned to the Lower Control knob In the 11401 and 11402 changing the vertical deflection factor magnifies or compresses the displayed signal about screen center Therefore to examine a portion of the input signal in greater detail use Vert Offset th
21. bes The Probe ID Function is part of the Probes pop up menu which is selected from the Utilities major menu All or some combination of the following operations may be set to start in response to probe ID buttons To display the Utility major menu press the front panel UTILITY button For details see the Probe Calibration and ID Function section of the Utilities subsection in the 11401 and 11402 User Reference Manual Pressing the probe ID button can initiate one of the following operations 1 Ifthe Probe ID function in the Probes pop up menu of the Utility major menu is set to Sequence Settings the next front panel setting will be recalled If the Probe ID Function is not set to Sequence Settings then operation 2 or 3 which involve a new waveform and waveform selection will occur If the Sequence Settings option is enabled front panel settings can be sequentially recalled via the Probe ID function The settings must be stored as explained under Storing and Recalling Waveforms in the 11401 and 11402 User Reference Manual 11A34 User Reference Supplement _To reset the input impedance to 50 Q first correct the overload condition then Operating the 11A34 in 11400 series Mainframes 2 If the Probe ID Function in the Probes pop up menu of the Utility major menu is set to Waveform Select New Wfm a waveform will be selected Figure 3 4 shows the sequence of decisions used to select a new waveform 3 If the Probe ID Functi
22. e 11A34 in 11400 series Mainframes Overdrive Recovery Overdrive occurs when any 11434 channel is driven out of its linear range of approximately 15 divisions The 11A34 has extraordinarily good overdrive recovery and this feature may be used to greatly extend measurement resolution For example suppose a signal changes from 1 7 V to 0 8 V in 1 ns The 11A34 could be used to determine if the signal stabilized immediately at 0 8 V or if perhaps had some small aberration following the transition By setting the 11A34 offset to 0 8 V and the sensitivity to 1 mV division aberrations of just 0 1 of the original transition will be 2 5 divisions in amplitude 0 1 of 2 5 V is 2 5 mV or 2 5 divisions at 1 mV division Any amplifier will ultimately reach an equilibrium value after an input step although its accuracy will determine how far that equilibrium value is from the correct value The 11A34 s ability to settle quickly to within a very small fraction of its equilibrium value is exceptional The time it takes the 11A34 to settle to within a stated fraction of the equilibrium value is its overdrive recovery time Measuring the overdrive recovery time of an 11A34 takes some care and can lead to some surprising results An interesting experiment is to use a very flat pulse generator such as the Tektronix PG 506 to pulse the 11A34 Connect the generator s fast rise output to the 11A34 input through a short one foot or less coaxial c
23. e Lower Control knob to position the area of interest to screen center Next use the Vert Size the Upper Control knob to adjust the display to the size needed for detailed examination Two four pole 24 dB octave bandwidth limit low pass filters are available for each 11A34 channel The purpose of these filters is to reduce the amplitude of unwanted noise or interference occurring at frequencies above the frequency of the signal of interest The user has a choice of cut off 3 dB frequencies either 20 MHz or 100 MHz independently for each channel The trigger auxiliary trigger and display signal bandwidths for a channel are always the same The auxiliary trigger is the signal sent to the right plug in compartment 11A34 User Reference Supplement _ DC Circuit Loading AC coupling capacitors are connected differently in the 11A52 and 11A71 than in the 11A32 and 11A34 Figure 3 1 shows this difference In the 11A52 and 11A71 the coupling capacitor isolates both the input termination and the amplifier from external DC voltages However the coupling capacitor in the 11A32 and 11A34 does not CH 11A52 11471 500 11432 11A34 C5922 203 Figure 3 1 Location of AC coupling capacitors in plug in amplifiers Always use caution when working with voltages in excess of 25 volts When 50 Q Impedance mode is selected and input coupling is set to AC or DC a 50 Q termination resistance is connected directly from the 11A34
24. e factor and output voltage scale factor Such data are serially encoded then stored in the EEPROM The probe data is intended to be read once at instrument power up or when the probe is first connected to a plug in unit that is at probe power up 11A34 User Reference Supplement Specification TABLE 4 2 Environmental Characteristics Characteristic Ambient Temperature external to main frame Operating within specs Nonoperating Humidity Operating and Nonoperating Altitude Operating Nonoperating Vibration Operating installed on Flexible Extender Shock Nonoperating not installed in mainframe Bench Handling operating and nonoperating Packaged Product Vibration and Shock Vibration and Bounce of Packaged Product Drop of Packaged Product Electromagnetic Compatibility 11A34 User Reference Supplement Information 0 to 50 C mainframe ambient 40 to 75 C Five days per MIL T 28800C Type IMI class 5 as described in 3 9 2 2 and 4 5 5 1 2 2 To 4 570 m 15 000 ft To 15 200 m 50 000 ft MIL T 28800C Sec 4 5 5 3 1 type HI class 5 MIL T 28800C Sec 4 5 5 4 1 type II class 5 MIL T 28800C Sec 4 5 5 4 3 type IMI class 5 Meets ASTM D999 75 Method A NSTA Project 1A B 1 Meets ASTM D775 61 Paragraph 5 NSTA Project 1A B 2 MIL STD 461B FCC Part 15 Subpart J Class A VDE 0871 6 78 Class B Specification Table 4 3 Physical Characteris
25. e person submitting the PR IV SECTION C Check the reason for the report and whether the problem is reproducible We cannot fix a problem when we cannot reproduce the problem condition V SECTION D Give a complete description of the system configuration on which the problem occurred Include related peripherals interfaces options special switch and or strap settings and operating system VE SECTION E Describe the problem completely Include any information which might help in evaluating the error with the PR If you have determined a procedure to avoid the error condition please include this procedure If this problem prevents you from accomplishing any useful work with the product please state this fact Be sure to include with the PR any information programs listings hard copies etc which will help us duplicate your problem VH SECTION F This section is for use by Tektronix Lab Instruments Marketing Support personnel DO NOT WRITE IN THIS SPACE i VIH Mail ail copies of the Problem Report to TEKTRONIX INC LAB INSTRUMENTS MARKETING SUPPORT P O BOX 500 DEL STA 39 327 BEAVERTON OREGON 97077 INTERNAL USE ONEY DO NOT WRITE BELOW THIS LINE F DATE RECEIVED su PR LOG
26. ear panel to shut OFF the power This will prevent damage to either the plug in or the mainframe To once again enable the ON STANDBY switch refer the instrument to qualified service personnel When installed in any 11401 or 11402 plug in compartment or in the 11301 11301A 11302 or 11302A left or center plug in compartment the 11A34 will provide a conventional display When installed in the center or right plug in compartment of the 11301 11301A 11302 or 11302A the 11A34 will also provide the X horizontal part of an X Y display or provide a trigger signal for the mainframe time base To install the 11A34 in any 11000 series oscilloscope mainframe set the mainframe ON STANDBY switch to STANDBY Align the grooves in the top and bottom of the 11A34 with the guides in the mainframe plug in compartment then insert the 11A34 into the mainframe until its front panel is flush with the front panel of the mainframe To remove the 11A34 from a mainframe set the mainframe ON STANDBY switch to STANDBY Then pull the release latch see Figure 1 1 to disengage the unit from the mainframe and pull the 11A34 straight out of the plug in compartment 11A34 User Reference Supplement 1 3 General Information TOP GROOVE MAINFRAME RELEASE LATCH Figure 1 1 Installing a plug in unit in a mainframe oscilloscope Instrument Options Option 23 includes four P6134 probes 1 4 11A34 User Reference Supplement General Information
27. ed to the CH 1 and CH 2 input connectors can be displayed or removed from the display by pressing the display on off buttons adjacent to the input connectors All other 11A34 functions are controlled through the host mainframe Such mainframe controlled functions are Sensitivity Coarse and Fine over a range of 1 mV to 10 V division Vertical Offset Coupling AC DC or Off Impedance input termination 50 Q or 1 MQ Bandwidth Limit 100 MHz or 20 MHz Display Polarity normal or inverted Trigger Polarity normal or inverted Combination of Display Channels See Operating Information section of mainframe User Reference manual Combination of Trigger Channels same as Display Channels see Operating Information section of mainframe User Reference manual 11A34 User Reference Supplement i ii 11A34 User Reference Supplement Contents Section 1 General Information Contents of this Supplement sense hante 11A34 Service Manual sssisescesisissocessssesansssasessvuatedsnstdovaceaas dass Le Plug in to Mainframe a seu induites D A bris 1 2 Initial Inspection sssrssseossserssncossesescscessseecsencesonacees PE EN Te 1 2 Operating Temperature aries ahi a iasi dt entente binnen 1 3 Installing and Removing the 11A34 iten neen Hein 1 3 Instrument Options EN EE Packaging for Shipment Naam teaser see 1 5 Section 2 Operating the 11A34 in 11300 series Mainframes Display On Once ENE oh 2 1 Selecting C
28. ervice your instrument e The 71434 Functional Test Procedure manual verifies that the instrument is functioning properly 11A34 User Reference Supplement B 1 Appendix B 2 11A34 User Reference Supplement MANUAL CHANGE INFORMATION At Tektronix we continually strive to keep up with latest electronic developments by adding circuit and component improvements to our instruments as soon as they are developed and tested Sometimes due to printing and shipping requirements we can t get these changes immediately into printed manuals Hence your manual may contain new change information on following pages A single change may affect several sections Since the change information sheets are carried in the manual until afl changes are permanently entered some duplication may occur if no such change pages appear following this page your manual is correct as printed SEND TO TEKTRONIX INC 7 LAB INSTRUMENTS MARKETING SUPPORT 11000 SERIES OSCILLOSCOPE P O BOX 500 DEL STA 39 327 PROBLEM REPORT BEAVERTON OREGON 97077 INSTRUMENT CONFIGURATION Instrument ROM Version ID Serial Number REASON FOR REPORT Option Information COMPANY NAME USER Hardware Mechanical Problem ADDRESS O Software Firmware Problem CN TA tt ZEP Ci Documentation Problem _ PR NE ee BA PENSION O Suggested Enhancement C IS THE PROBLEM REPRODUCIBLE SUBMITTED BY L Yes Ci N
29. he query response is Level 1 If a Level 2 TEKPROBE is connected the query response is Level 2 lt probe_type gt lt serial_number gt When neither Level 1 nor Level 2 TEKPROBE is connected the query response is NONE L C and R mean Left Center and Right plug in compartments 1 and 2 mean Channel 1 and Channel 2 respectively Sets the specified channel input coupling Sets the specified channel offset Sets the HF Limit bandwidth of the specified channel Numeric representation Sets the input impedance of the specified channel Sets the deflection factor of the specified channel Sensitivity is a channel specific command which does not apply to compound waveforms Quoted string data 2 11 Operating the 11A34 in 11300 series mainframes 2 12 11A34 User Reference Supplement Section 3 Operating the 11A34 in 11400 series Mainframes Display On Off The 11A34 has only four front panel controls the display on off buttons Pressing a display on off button will cause its channel and signal to be displayed or removed from the display the function toggles When a channel is displayed its label CH 1 or CH 2 will be lighted Other Functions All other 11A34 functions are controlled within the 11401 or 11402 oscilloscope and their operation is described in the 11401 and 11402 User Reference manual Table 3 1 shows where to find information about operating the 11A34 TABLE 3 1 Functions
30. ication of this Supplement and in the Tektronix Corporate Catalog Refer to the Tektronix Corporate Catalog for complete compatibility information Initial Inspection This instrument was inspected mechanically and electrically before shipment and should meet all electrical specifications First inspect the 11A34 for physical damage incurred in transit Secondly to verify that the instrument is functioning properly perform the Functional Test Procedure shipped with the instrument This brief procedure verifies most instrument functions and checks the internal auto calibration references If you find instrument damage or deficiency contact your local Tektronix Field Office or representative eeeh ede S 1 2 REV NOV 1988 11A34 User Reference Supplement General Information Operating Temperature The 11A34 can be operated where the ambient air temperature is between 0 and 50 C and can be stored in ambient temperatures from 40 to 75 C After storage at temperatures outside the operating limits allow the chassis to reach operating temperature limits before applying power Installing and Removing the 11A34 To avoid instrument damage set the mainframe ON STANDBY switch to STANDBY before installing or removing the 11A34 If the green indicator light remains ON when the STANDBY position is selected the switch has been internally disabled To remove or reinstall plug in units use the mainframe PRINCIPAL POWER SWITCH r
31. input connector to ground Take care that the circuit connected to the 11A34 input will not be damaged by the 50 Q load Switching from 1 MQ to 50 Q Impedance mode when more than 25 VDC is present at the 11A34 input will exceed the peak input voltage specification and may damage the 11A34 input relay A damaged relay could cause an error in calibration 11A34 User Reference Supplement 3 3 Operating the 11A34 in 11400 series Mainframes Adding and Subtracting Waveforms The 11401 and 11402 mainframes do not allow the addition or subtraction of live waveforms without restriction The reason for this lies in the manner in which samples are taken and used by the mainframe Each plug in compartment has an associated sampler in the 11401 or 11402 Samples are taken simultaneously by each sampler A channel from one plug in unit may be added to or subtracted from that of another plug in unit accurately by virtue of this simultaneity Thus noise and other signals unrelated to the trigger will be canceled when channels in different plug in units are subtracted Signals from different channels within a plug in unit are sampled at different times Signals that are entirely repetitive and related to the trigger signal may be successfully added or subtracted in spite of this However signals that are not repetitive or related to the trigger will not be sampled at the same time and may not be displayed correctly Therefore it is preferable that sign
32. ion applies Each channel must be in its linear operating range This is assured if each channel separately is within the screen area before addition Those portions of a trace which are off screen will not be valid when brought back on screen using another channels input signal or Offset control This general restriction applies to any dual channel oscilloscope 24 11A34 User Reference Supplement Operating the 11A34 in 11300 series mainframes Overdrive Recovery Overdrive occurs when any 11A34 channel is driven out of its linear range of approximately 15 divisions The 11A34 has extraordinarily good overdrive recovery and this feature may be used to greatly extend measurement resolution For example suppose a signal changes from 1 7 V to 0 8 V in 1 ns The 11A34 could be used to determine if the signal stabilized immediately at 0 8 V or if perhaps had some small aberration following the transition By setting the 11A34 offset to 0 8 V and the sensitivity to 1 mV division aberrations of just 0 1 of the original transition will be 2 5 divisions in amplitude 0 1 of 2 5 V is 2 5 mV or 2 5 divisions at 1 mV division Any amplifier will ultimately reach an equilibrium value after an input step although its accuracy will determine how far that equilibrium value is from the correct value The 11A34 s ability to settle quickly to within a very small fraction of its equilibrium value is exceptional The time it takes the 11A34 to
33. iv 10 mV 0 10 div 0 25 5 mV 1Vto10V 0 9 0 012 div 110 mV 0 10 div 0 25 50 mV With P6134 Probe calibrated from 11401 and 11402 Calibrator output Volts Div AV DC Acc DC Balance DC Offset Acc 1 mV to 995 mV 0 9 0 012 div 7 0 mV 0 10 div 0 25 5 mV 1 V to 9 95 V 0 9 0 012 div 70 V 0 10 div 0 25 50 V 10 V to 100 V 0 9 0 012 div 0 7 V 0 10 div 0 25 0 5 V w Probe tip TC term 100 ppm C With P6231 Probe calibrated from 11401 and 11402 Calibrator output DC Balance DC Offset Acc 10 mV to 995 mV 1 0 0 012 div 5 mV 0 10 div 0 20 2 mV 21 V 10 0 012 div 50 mV 0 10 div 0 20 2 mV Probe Tip TC term 100 ppm C For absolute DC accuracy of single point measurements using Offset add the DC Offset Accuracy DC Balance and AV DC Accuracy terms Apply the AV DC Accuracy only to the difference between the Vertical Position setting and the measurement point 11A34 User Reference Supplement TABLE 4 1 cont Specification Electrical Characteristics Circuit Characteristic Display Coarse Resolution Deflection Factor Sensitivity Fine Resolution cont Display Accuracy Offset Range Resolution depend on Deflection Factor as follows Between 1 mV and 99 5 mV div Between 0 1 V and 0 995 V div Between 1 V and 10 0 V div 11A34 User Reference Supplement Performance Require
34. lly recalled Pressing the probe ID button can cause a sequential recall of stored settings The stored settings feature must be enabled using the Probe ID Utility menu Settings must be stored as explained under STORE RECALL Major Menu in the 11301 and 11302 User Reference manual or the 11301A and 11302A User Reference Manual 3 The mainframe can Autoset to accommodate the input signal introduced by the probe The Autoset feature can be enabled or disabled using the Probe ID Utility menu Autoset is the automatic setup of vertical deflection factor triggering and sweep speed to produce a meaningful display e g two to five divisions of vertical deflection and two to five repetitions of the input signal For more information refer to Autoset in the 11301 and 11302 User Reference manual or the 11301A and 11302A User Reference Manual 11A34 User Reference Supplement Operating the 11A34 in 11300 series mainframes 4 The mainframe can automatically measure the selected trace Automatic measurements of the selected trace can be initiated by pressing a probe ID button The Automatic Measurements feature can be enabled or disabled using the Probe ID Utility menu Such measurements are peak to peak maximum middle and minimum voltages frequency period pulse width and duty cycle For full information about automatic measurements see Measure in the 11301 and 11302 User Reference manual or the 11301A and 11302A User Reference Manual 5 An
35. ment 1 2 5 sequence Depends on Deflection Factor as follows Rotating the Fine control one increment will change the Deflection Factor by 1 of the next more sensitive Coarse setting For example with deflection factor set to 198 mV rotating the Fine control counterclockwise will cause this sequence of sensitivities 199 mV 200 mV 202 mV etc Rotating the Fine control clockwise from 204 mV div will cause the reverse sequence 202 mV 200 mV 199 mV etc See Deflection Factor Accuracy which precedes this characteristic 1 V Coarse and fine resolution are 0 25 div 250 KV and 0 025 div 25 LV respectively 10 V Coarse and fine resolution are 0 25 div 2 5 mV and 0 025 div 250 uV respectively 100 V Coarse and fine resolution are 0 25 div 25 mV and 0 025 div 2 5 mV respectively Specification TABLE 4 1 cont Electrical Characteristics Circuit Characteristic Performance Requirement Display High Frequency Limit 3 dB point E R nse of Display Auxiliary amp Trig signals on an oo 3 Zin 50 Q and Calculated Rise Time Type of Mainframe Volts Division 11301 A 11302 A 11401 11402 250 MHz 250 MHz 300 MHz 300 MHz 1 4 ns 1 4 ns 1 2 ns 1 2 ns 5 mV 9 95 mV 200 MHz 250 MHz 250 MHz 1250 MHz 1 8 ns 1 4 ns 1 4 ns 1 4 ns 2 mV 4 98 mV 200 MHz 200 MHz 200 MHz 200 MHz 1 8 ns 1 8 ns 1 8 ns 1 8 ns 1 mV 1 99 mV 150 MHz 150 MHz 150 MHz 150 MHz 2 3 ns 2 3 ns 2 3 ns 2
36. o Intermittent SYSTEM DESCRIPTION Hardware software firmware and host related to the problem DESCRIPTION OF PROBLEM LIST ENCLOSURES Tektronix COMMITTED TO EXCELLENCE 250 065 1 00 Par Instructions For Completing The Problem Report I Please type or print clearly Use a separate Problem Report PR for each problem H SECTION A Fill in the instrument configuration table including all plug in units modules and probes installed in the oscilloscope The information can be found in one of the menus under the UTILITY major menu Instrument Write the instrument name e g 11301 11401 11A32 etc Section Microprocessor Subsystem If the instrument has more than one section write the section name For plug ins write in which mainframe slot they are located e g left center right ROM Version Write the rom version number for each instrument and section Instruments with more than one section will have more than one version number ID Serial Number Write the serial number for each instrument At the factory the ID number is pro grammed to be the instrument s serial number If this value has been changed please write the serial number physically attached to the instrument mainframes front panel plug in units top rail HI SECTION B Use the complete company mailing address Include the name and phone number of the person reporting the error Also be sure to fill in the name of th
37. of plus and minus four divisions from graticule center but the Offset control has a range defined in volts Offset can be as much as 1000 divisions at 1 mV division The Offset control range is one volt for all sensitivities from 1 mV to 99 5 mV division but increases to 10 volts for sensitivities from 100 mV to 995 mV division For sensitivities from 1 volt to 10 volts division Offset control range increases to 100 volts 11A34 User Reference Supplement Operating the 11A34 in 11300 series mainframes The 11A34 attempts to maintain the user selected offset voltage even though the offset range changes due to a change in sensitivity An offset voltage of less than one volt will be maintained as the sensitivity is changed over the entire range of 1 mV division to 10 V division A selected offset of greater than one volt is beyond the offset range for the most sensitive settings and will be reset to one volt when the sensitivity is increased to any value between 99 5 mV and 1 mV division HF Limit Two four pole 24 dB octave bandwidth limit low pass filters are available for each 11A34 channel The purpose of these filters is to reduce the amplitude of unwanted noise or interference occurring at frequencies above the frequency of the signal of interest The user has a choice of cut off 3 dB frequencies either 20 MHz or 100 MHz independently for each channel The trigger auxiliary trigger and display signal bandwidths for a channel a
38. on 1 6 11A34 User Reference Supplement Section 2 Operating the 11A34 in 11300 series Mainframes Display On Off The 11A34 has only four front panel controls the display on off buttons Pressing a display on off button will cause its channel and signal to be displayed or removed from the display the function toggles When a channel is displayed its label CH 1 or CH 2 will be lighted Selecting Coupling HF Limit and Impedance To select the desired setting for Coupling HF Limit or Impedance proceed as follows la If no trace is displayed press any plug in display on off button to create a trace 1b If several traces are displayed select a channel by touching the desired trace description at the top of the CRT 2 On the 11301 and 11302 oscilloscopes press any VERTICAL button once OFFSET SIZE or POS On the 11301A and 11302A oscilloscopes press any VERTICAL button twice This will cause the Control Menu to be displayed 3 Touch the desired function s label Successive touches will change its state 11A34 User Reference Supplement 2 1 Operating the 11A34 in 11300 series mainframes Other Functions Other 11A34 functions are controlled within the 11300 series mainframe and their operation is described in detail in Section 2 Operating Information of the 11301 and 11302 User Reference Manual and the 11301A and 11302A User Reference Manual Table 2 1 shows where to find information about operating the 11A
39. on the plug in unit sets the DAC to the limit nearer the requested setting Message Bad Level 2 probe checksum on channel N of LEFT CENTER or RIGHT plug in unit where N 1 or 2 Cause Some plug in unit detected that a Level 2 TEKPROBE had failed or been improperly connected 3 10 11A34 User Reference Supplement Operating the 11A34 in 11400 series Mainframes 2 GPIB and RS 232 C Commands and Syntax The following commands set parameters of a specified channel Table 3 2 Channel Parameter Commands for 11400 series Oscilloscopes Header Link Argument mm A CH lt L1 L2 C1 COUPLING ACIHDCI OFF C2 R1 or R2 gt OFFSET lt NRx gt Resolution Step Size Volts div Offset via RS 232 C GPIB via front panel Range or Numeric Entry Control knob ImVto995mV 1V Coarse 0 25 div 100 mV to 995 mV 10 V Fine 0 025 div 1Vto10V 100 V lt NRx gt lt 24E6 gt 24E6 to lt 120E6 gt 120E6 l IMPEDANCE lt NRx gt lt 1E3 gt 1E3 SENSITIVITY Sensitivity 1E 3 to 1 99E 3 2E 3 to 4 98E 3 5E 3 to 9 95E 3 10E 3 to 19 9E 3 20E 3 to 49 8E 3 50E 3 to 99 5E 3 100E 3 to 199E 3 200E 3 to 498E 3 500E 3 to 995E 3 1 to 1 99 2 to 4 98 5 to 10 lt qstring gt query only UNITS input Bandwidth 20E6 100E6 300E6 11401 300E6 11402 Resolution step size 10E 6 20E 6 50E 6 100E 6 200E 6 500E 6 1E 3 2E 3 5E 3 10E 3 20E 3 50E 3 The 11A34 answers a Units query with
40. on is set to Wim Select New Wim amp AutoSet then the decisions shown in Figure 3 4 will be made and the resulting selected waveform is autoset Events 1 2 and 3 are mutually exclusive Event 4 may be combined with any one of them 4 If the IDPROBE SROMASK is enabled an appropriate event will be returned to the GPIB and RS 232 C ports PROBE ID N ACTUATED 3 J SINGLE CHANNEL SINGLE CHANNEL WAVEFORM SELECTED WAVEFORM EXISTS 3 CORRESPONDING TO CORRESPONDING TO ID N KNOBS CONTROL iD N ID N PARAMETERS COMBINATION SINGLE COMBINATION WAVEFORM EXISTS WAVEFORM SELECTED CORRESPONDING TO oe eaten ID N KNOBS CONTROL ID N PARAMETERS TOGGLE WAVEFORM MULTIPLE WAVEFORMS SELECTION TO NEXT EXIST WITH ID N ap WAVEFORM IN LIST A COMPONENT AFTER SELECTION KNOBS CONTROL ID N PARAMETERS DEFINE WAVEFORM WITH ID NAS DEFAULT WAVEFORM NOTE BOTH THE VERTICAL DESCRIPTION AND THE HORIZONTAL DESCRIPTION MUST BE CHECKED FOR THE OCCURRENCE OF IDN C5921 303 Figure 3 4 Sequence of decisions used to select a new waveform in response to probe ID button 11A34 User Reference Supplement 3 9 Operating the 11A34 in 11400 series Mainframes Front Panel Error Messages Message Internal DAC overflow on channel N of LEFT CENTER or RIGHT plug in unit where N 1 or 2 Cause Some plug in unit detected that a requested setting overflowed an internal DAC Such overflow usually indicates defective hardware In this situati
41. oupling HF Limit and Impedance eee valenta ded Other Functions iu darna enne buen tante dennen Doe Position and Offset sions A EI PE ne EER Lat SRE PR Et dafou E AR hase 2 3 DC Circuit LOA ed ER Adding Waveforms A SE Re TN 24 Overdrive RECOVERY sisi wenskaart nnie ZaD 50 Q Overload essuie arane i iai PR nd Active Probes since S a E EA anin POR 2 8 Probe En nr St isi online sive 28 Front Panel Error Messages TE ede EURE sit O GPIB and RS 232 C Commands and Syntax sensenseneanen eee Sins 2 10 Section 3 Operating the 11A34 in 11400 series Mainframes Display On Off nnn nait Danoise mere De Other Fant Hons nes amenant Vertical Offset uunissa irisean dereiran ainan PR Oks BW Limit ci sans EG DC CHOCO LOA Ging raand anton sekste eedt eeen nge ded Adding and Subtracting Waveforms PR RE 3 4 Overdrive Recovery rennes EE Giles ba 3 5 50 Q Overload ss nn cnrs de nanas hasta Or Active Probes ssadsescscocussaseacissse dst ares niet Te 3 8 Prope D ess Ras hs RE 3 8 Front Panel Error Messages es node TS RTE ut GPIB and RS 232 C Commands and Syntax ne RCE a N Section 4 Specification Performance Conditions EAA EEATT REE EA adel Electrical Characteristics ledit PR PRES 4 1 Environmental Characteristics nr 4 7 Physical Characteristics ene desslveusdhsiatecesesstans if 4 8 Recommended Probes ann saas enso oss eneerosve verccoreeenn hendeken 4 8 11A34
42. prise is that skin effect loss disappears almost completely after two cable delays when one end is unterminated To observe this use the short cable again and select 1 MQ input impedance on the 11A34 Insert a 2X attenuator between the cable and the pulse generator to improve the reverse termination and to provide the same amplitude signal as before Observe the response and change cables again Even at 0 1 per division the skin effect loss is hard to detect without the forward termination The reason for this is that the skin effect loss is an increase in the effective series resistance of the cable Without current the cable develops no series voltage drop See Figure 2 3 11A34 User Reference Supplement C5922 202 Figure 2 3 Overdrive recovery using long top and short bottom cables unterminated Traces are offset two divisions and the photograph is a double exposure 50 Q Overload When the input impedance is set to 50 Q and the input voltage substantially exceeds 5 Vrms the 11A34 will sense the overload disconnect the 50 Q input termination and connect the 1 MQ termination The Impedance menu will show 1 MQ and the mainframe will display the message Input channel N overload on LEFT CENTER RIGHT plug in where N 1 or 2 To reset the input impedance to 50 Q first correct the overload condition then select 50 Q from the Impedance menu 11A34 User Reference Supplement 2 7 Operating the 11A34 in 11300 se
43. re always the same The auxiliary trigger is the signal sent to the right plug in compartment o DC Circuit Loading AC coupling capacitors are connected differently in the 11A52 and 11A71 than in the 11A32 and 11A34 Figure 2 1 shows this difference 500 41452 11471 500 11432 11434 Figure 2 1 Location of AC coupling capacitors in plug in amplifiers C5922 203 11A34 User Reference Supplement 2 3 In the 11A52 and 11A71 the coupling capacitor isolates both the input termination and the amplifier from external DC voltages However the coupling capacitor in the 11A32 and 11A34 does not Always use caution when working with voltages in excess of 25 volts When 50 Q Impedance mode is selected and input coupling is set to AC or DC a 50 Q termination resistance is connected directly from the 11A34 input connector to ground Take care that the circuit connected to the 11A34 input will not be damaged by the 50 Q load Switching from 1 MQ to 50 Q Impedance mode when more than 25 VDC is present at the 11A34 input will exceed the peak input voltage specification and may damage the 11A34 input relay A damaged relay could cause an error in calibration Adding Waveforms NOTE Before adding waveforms check that each channel s display is independently on screen The 11300 series oscilloscopes allow the addition of any two channels That is one channel may be added to a channel from another plug in unit A simple restrict
44. ries mainframes Active Probes Probe ID Using an active probe such as the P6231 eliminates two options AC Coupling and 1 MQ input impedance Coupling options available when using such a probe are Off and DC the only Impedance available is 50 Q The Probe ID section of the Utility Menu is the means of selecting how any 11300 series oscilloscope responds to an ID button push of recommended probes All or some combination of the following operations may be set to start in response to probe ID buttons To display the Utility Menu press the front panel UTILITY button once on 11301 or 11302 oscilloscopes twice on 11301A or 11302A oscilloscopes For details see the Probe ID section of the Waveform Acquisition subsection in the mainframe User Reference manual Pressing the probe ID button can initiate one or more of the following operations 1 Present a new display or if that channel is already displayed select the existing trace Pressing the ID button of a probe connected to an undisplayed left or center compartment channel will cause that channel to be displayed unless doing so would exceed the maximum number or traces Unlike the 11A34 display on off button pressing the probe ID button a second time will not remove the display Probe ID button presses for displayed channels will do two things a select the trace s using this channel and b momentarily brighten all traces using this channel 2 Stored settings can be sequentia
45. tics Characteristic Information Weight max 2 Ib 7 oz 1 1 kg Weight of Packaged Product max 5 Ib 5 oz 2 4 kg Dimensions max Refer to Figure 4 1 Recommended Probes Tektronix recommends these probes for use with the 11A34 P6134 Subminiature 10X Passive Probe with ID With 1 MQ inputs the P6134 s input impedance is 10 MQ in parallel with 10 5 pE The P6134 is a Level 1 probe P6231 Low Impedance Subminiature 10X Active Probe The P6231 has a bandwidth of 1 5 GHz input impedance of 450 Q and DC offset of 5 V controlled by the 11A34 The P6231 is a Level 2 probe 4 8 11A34 User Reference Supplement Specification NOTE TOP FIGURES ARE IN MILLIMETERS AND BOTTOM FIGURES ARE IN INCHES C592140t aerden 009 mn 11A34 User Reference Supplement 4 9 Specification RS a a ce et 4 10 11434 User Reference Supplement Appendix A Glossary Deflection factor Display on off button Mainframe Offset ON STANDBY Overdrive Overload Toggle The ratio of input signal to response in the 11000 system The reciprocal of sensitivity The front panel plug in button that designates a channel for display or removes a channel from the display Any 11000 series oscilloscope exclusive of plug in units A control that allows the user to subtract a precision voltage from the input signal to vary the position of the displayed signal The front panel power control on 11000 series mainframes When
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