Four Channel Amplifier
Contents
1. TEKTRONIX TEK User s Reference Part No 070 5921 00 J Supplement Product Group 47 LLA3S4 Four Channel Amplifier Serial Number Please check for CHANGE INFORMATION in the rear of this manual FirstPrintingFEB1967 2 lt lt lt See ie aa Tektronix COMMITTED TO EXCELLENCE a q vaga M H a A a a alk al B R i fri H ih i ll qt Mi Mh kol A vy li a aM Ani aly l k Mi TEK_INTER OFFICE COMMUNICATION TO FROM SUBJECT Coe ya Oe a John Martin 94 540 June 25 1991 Dare Frank Gray 50 PAT GIDEP permit request In response to the request to grant permission to the Government Industry Exchange Program GPDEP to reproduce Tektronix operator service and instruction manuals Taktronix Inc hereby grants such permission for distribution of such documents to any GIDEP user that is a full participant in the Metrology Data Interchange Data Base of GIDEP provided that all copies of the original work include the entire copyright notice and ownership statement exactly as it appears in the original together with the Legend Reproduced with permission This permission has been approved by the Intellectual Property Committee of Tektronix and a copy of this memo may be provid2. Front Panel Error Messages Message Internal DAC overflow on channel N of LEFT CENTER or RIG HT plug in unit whereN 1 2 3 ord Cause Some plug in unit detected that a requested setting overflowed an internal DAC Such overflow usually indicates defective hardware Im this situation the plug in unit sets the DAC to the limit nearer the requested Wing Message Bad Level 2 probe checksum on channel N of LEFT CENTER or RIGHT plug in unit where N 1 2 3 ord Cause Sorne plug in unit detected that a Level 2 TEKPROBE had failed or beet improperly connected Part 3 Operating the 11A34in 11401 and 11402 Mainframes 9 GPIB and RS 232 C Commands and Syntax The following commands set parameters of a specified channel Header Link Argument Gia 2s ACIDCIOR LA CL C2 C3 C4 R1 R2 R3 R4 gt OFFSET Reolat Step Size Volts div via RS 2324 IB via front panel or Numerii Control knob imvV to9 imviossmv 1V Coarse 0 25 div 100 mV to 995 mV 10 V FeO Fine 0 025 div BW 1Vim10Vv 100 V 2 5E lt NRx gt S456 gt 24E6 to 5120E6 gt 120E6 lt NRx gt Sensitivity 1E 3 to 1 99E 3 2E 3 t 498E 3 SE 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
3. Functions And Where They Are Described Functions And Where They Are Deseribed Electrical Characteristics Environmental Characteristics Physical Characteristics Test Equipment Required Y1A34 Users Reference Supplement VA34 iii Part 1 General Information Technical Manuals his Supplement to the mainframe User s Reference manuals and the Incoming Inspection Procedure manual are standard accessories to the 11434 For a list of related manuals see Appendix B Contents of this Supplement This Supplement contains the following five parts Part I GENERAL INFORMATION describes mainframe to plug in unit compatibility explains how to install and remove the 11434 from a mainframe outlines any options available for the 11A34 and gives details about packaging for shipment Most 11A34 functions and their use ar described in the Operating Information section of the mainframe User s Reference manuals These functions are 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 11434 11301 11302 or 11434 11401 11402 combinations are explained in the following parts Part Z OPERATING THE 11A34 IN 11301 AND 11302 MAINFRAMES explains how to operate those 11A34 functions not covered in the 11302 User s Reference manual
4. 11A52 11471 500 11A32 11A34 Figure 2 1 Location of AC coupling capacitors in plug in amplifiers 11A34 User s Reference Supplement gg 23 In the 11452 and 11471 the coupling capacitor isolates both the input termination end the amplifier from external de voltages However the coupling capacitor in the 11432 and 11434 does not Always use caution when working with voltages in excess of 25 volts When 5082 Impedance mode is selected and input coupling is set to AC or DC a S02 termination resistance ts 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 5082 load Switching from 1 MQ to 50 Impedance mode when more than 25 Vde is present at the 11 434 input will exceed the peak input voltage specification and may damage the 11 434 input relay A damaged relay could cause an error in calibration gt Adding Waveforms NOTE Before aii waveforms check that each channel s display is independently on screen The 11301 and 11302 allow the addition of any two channels That is one channel may be added to a channel from another plug in unit A simple restriction applies Each channel must be in its linear operating range This is assured if each channel separately is within the sereen area before a
5. Adding and Subtracting Waveforms overdrive Recovery asrcha nisnin g A a 50Q Overload Acti ve Probes Front Panel Error Messages GPIB and RS 232 C Commands and Syntax Part P Specification Performance Conditions Electrical Characteristic3 Environmental Characteristics Physical Characteristics Recommended Probes 11 A34 Users Reference Supplement REV JUL1987 Contents Appendix A Glossary Appendix B Instrument Documentation iioo B 1 Illustrations Installing a plug in unit in a mainframe oscilloscope birri tetttrerdeetedetetedt rebate eat l Location of AC coupling capacitors in plug in amplifiers 2 Overdrive recovery using long top and short bottom cables terminated in 50Q Traces are offset two divisions and the photograph is a double exposure p paspprprsppanannannanaaranunnnannanaavanannnnnnnnonnnnansannn ranna 2 5 Overdrive recovery using long top and short bottom cables unterminated Traces are offset two divisions and the photograph is a double exposure Location of AC coupling capacitors in plug in amplifiers Overdrive recovery using short top and long bottom cables terminated in 50 Traces are offset two divisions and the illustration is a composite oftwo waveforms Overdrive recovery using short top and long bottom cables unterminated Traces are offset two divisions and the illustration is a composite of two waveforms Sequence of decisions used to select a new waveform in res
6. Part 3 OPERATING THE 11A IN 11401 AND 11402 MAINFRAMES explains how to operate those 11A34 functions not covered in the 11401 and 11402 User s Reference manual Part 4 SPECIFICATION gives detailed specifications of all 11A34 mainframe oscilloscope combinations 11 A34 User s Reference Supplement REV OCT 1987 11A34 1 L Technical Manuals 1 1434 Service Manual WARNING The 1A34 Service Manual is for use ty qualified service personnal only To avoid personal injury do not perform arty service other than that contained in th Operators manual unl amp s you are a T The 11434 Service manual containsthe following i nf ormati on Section 1 GENERAL INFORMATION Section 2 THEORY OF OPERATION Section S MAINTENANCE AND DIAGNOSTICS Section 4 PERFORMANCE VERIFICATION AND ADJUSTMENT Section INSTRUMENT OPTIONS Section amp REPLACEABLE ELECTRICAL PARTS Section 7 SCHEMATIC DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS Section amp REPLACEABLE MECHANICAL PARTS Plug in to Mainframe Compatibility The 11A34 is designed for use in the 11301 11302 11401 11402 and future 11000 series plug in mainframes 1 1A34 bandwidth varies depending on the host mainframe Details about bandwidth are included in Part4 Specification of this Supplement and in the Tektronix Corporate Catalog Refer to the Tektronix Corporate Catalog for complete compatibility information Initial Inspection T
7. eae and My damage the 71434 input relay A damagedrelay Could cause an error in calibration 11A34 User s Reference Supplement 11A34 3 3 Adding and Subtracting Waveforms The 11401 and 11402 mainframes donot allow the addition or subtraction of live waveforms without restriction The reason for this lies in the manner if which samples are taken and used by the mainframe Each plug in compartment has an associated sampler in the 11401 or 11402 Samples ara taken simultaneously each sampler A channel from one plug m unit maybe added to or subtracted from that of another plug in unit marae 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 urut are sampled at different times Signals that are entirely repetitive and related to the trigger signal maybe 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 signals 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
8. information refer to the GPIB RS 232 C part of the 11301 and 11302 User s Reference manual Front Panel Error Messages Message Internal DAC overflow on channel N of LEFT CENTER or RIGHT plug in unit where N 1 2 3 or 4 Cause Some plug in unit detected that a requested setting overflowed an internal DAC Such overflow usually indicates defective hardware Jn 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 2 3 or4 Cause Some plug in unit detected that a Level 2 TEKPROBE had failed or been improperly connected Part 2 Operating the 11A34in 11301 and 11302 Mainframes Link COWLING OFFSET Header CH L1 L2 L3 LA CI C2 C3 C4 RI R2 R3 R gt ImV to99 5mV 100 mV ip 995 mV TVinjOoVv IMPEDANCE SENSITIVITY 1 ta 100 11A34 User s Reference Supplement NRx gt Offset Range GPIB and RS 232 C Commands and Syntax The following commands set parameters of a specified channel Argument AC DC OFF t1V t10V HOV Rts 2 5E 39 2486 to S120E6 gt 120E6 Rasa via R5 232 C GPIB or Numeric Ent St via front panel Control knob Coarse 0 25 div Fine 0 025 div HF Limit 20E6 100E6 250E6 11301 250E6 11302
9. it be packaged in the original manner The original carton and packaging material can be saved and reused for this purpose NOTE Package and ship plug in units and mainframes separately If the 11434 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 Complete instrument type and serial number and e A description of the service required If the original package isnot available or is not fit for use package the 11434 as follows 1 Obtain a corrugated cardboard carton with inside dimensions at least six inches greater than the mstrument dimensions Use a carton with a test strength of at least 200 pounds Fully wrap the 11434 with anti static sheeting or its equivalent to protect the finish Cushion the 11 434 on all sides by tightly packing dunnage or urethane foam between the carton and the instrument Aon three inches of packing on each side Seal the carton with shipping tape or with industrial staples Mark the address of the Tektronix Service Center and your return address on the carton in one or more prominent places 11A34 User s Reference Supplement a Operating the 11A34 in 11301 and 11302 Mainframes Displa
10. 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 s Reference manual 11A34User sReferenc eSupplement Probe ID 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 Autos et 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 s Reference manual 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 s Reference manual An 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
11. the Impedance menu vane an active probe such as the 6231 eliminates two options Ac Coupling and MQ input impedance Coupling options available when using such a probe are Off and Dc the only Impedance available is 500 The Probe ID part of the Utility Menu is the means of selecting how the 11301 or 11302 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 pa the front panel UTILITY button For details see the Probe ID part of the Waveform Acquisition subsection in the 11301 and 11302 User s Reference manual Pressing the probe ID button can initiate one or moreof the following operations 1 Fresent a new display or if that hannel Is already displayed select the eraun trace Pressing the ID button of a probe connected to an undisplayed left or center compartment channel will cause that channel to Ix displayed unless doing so would exceed the maximum number or traces Unlike the 1 1A34 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 al traces using this channel gred settings can be sequentially recalled Pressing the probe ID button can cause a sequential recall of stored settings The stored settings feature
12. the a major menu is set to Waveform Select New Wim a waveform will be selected Figure 3 4 shows the sequence of decisions used to select anew waveform PROBE iD N ACTUATED SINGLE CHANNEL WAVEFORM EXISTS CORRESPONDING TO ID N SINGLE COMBINATION WAVEFORM EXISTS WITH IDNA COMPONENT MULTIPLE WAVEFORMS EXIST WITH ID N A COMPONENT DEFINE WAVEFORM WITH ID N AS DEFAULT WAVEFORM SINGLE CHANNEL WAVEFORM SELECTED CORRESPONDING TO ID N KNOBS CONTROL ID N PARAMETERS COMBINATION WAVEFORM SELECTED CORRESPONDING TO ID N KNOBS CONTROL ID N PARAMETERS TOGGLE WAVEFORM SELECTION TO NEXT WAVEFORM IN LIST AFTER SELECTION KNOBS CONTROL ID N PARAMETERS NOTE BOTH THE VERTICAL DESCRIPTION AND THE HORIZONTAL DESCRIPTION MUST BE CHECKED FOR THE OCCURRENCE OF ID N 5022 30 Figure 3 4 Sequence of decisions used t select a new waveform in response to probe ID button If the Probe ID Function 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 Ifthe IDPROBE SRQMASK is enabled an appropriate event will be returned to the GPIB and RS 232 C ports I1A 34 Users Reference Supplement
13. 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 througha short one foot or less coaxial cable and select 502 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 jnerease the cable length by about three feet for example use a 42 inch length of RGS8 cable Tektronix part 012 0057 01 and observe the new waveform See Figure 2 2 Figure 2 2 Overdrive recovery using long top and short bottom cables terminated in 50Q Traces are offset twe divisions and the photograph is a double exposure 1434 User s Reference Supplement Overdrive Recovery 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 ola cable delay is only 5 ns At 400 ns the loss is still 0 02 gh This experiment shows th importance of using a short cable to test ov
14. to the mainframe Even when using channels from different plug in compartments the following two problems limit the accuracy of sums or differences l Each waveform in memory is constantly being updated and therefore consists of sOmme 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 1s processed and displayed Delay differences between channels of different plug m units due to probe cable length differences are normally removed by deskewing the probes and the associated amplifier channel Samples are still taken simultaneously 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 Part 3 Operating the 11A34 in 11401 and 11402 Mainframes Overdrive Recovery Overdrive occurs when any 11A34 channel is driven out of its linear range of approximately 15 divisions The 1 1A34 has extraordinarily good overdrive recovery and this feature may be used to g
15. 20 o 0 50mV 100 mY to 95 mV 0 9 O 012div A10mV 0 10div 40 25 5mV 1Vto10V 0 9 O 012div 100mV ss 0 10dliv 40 25 50mV With P6134 Probe calibrated from 11401 11402 Calibrator output Volts Div AV DC Ace DC Balance DC Offset Acc 1Vtossv aos toodi s7omVs olddiv IHO2 5mv iveo9v T oom samy i 70mV 00 Tx025 50mv 10V to 100V 410 9 O 012div 0 7V 0 10div 025 0 5V ProbetioTCtem 100 pom C na na With P6231 Probe calibrated from 11401111402 Calibrator output VoltwDiv AV DC Ace DC Balance DC Offset Ace 10mV t0995 mV mV 0 10div 0 20 2mV ze PONAM fobeTpToem parc IFor absolute de 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 Part 4 Specification Electrical characteristics TABLE amp 1 cont Electrical Characteristics Characteristic Performance Requirement DISPLAY cont DEFLECTION FACTOR Sensitivity cont C Resolution 1 2 5 sequence Fine Resolution 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 Fiie control counterc
16. Impedance 0 1E6 Sensitivity TE 3 to ssE 3 2E 3 to 4 98E 3 5E 3 to 9 95E 3 10E 3 to 19 9E 3 205 3 to 49 8E 3 50E 3 to 99 5E 3 TOQE 3 to 1998 3 200E 3 to 498E 3 500E 3 to 995E 3 1101 99 2to 4 98 5to10 lt qstring gt query only Resolution step size 10E 6 20E 4 ME 6 100E 200E 6 MOE 6 1E 3 2E 3 SE 3 10E 3 20E 3 ME 3 The 11 434 answers a Units query with a units status messa which indicates the units of conversion of a probe connected to its Ch N input 1 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 GPIB and _R5 232 C Commands and Syntax Z gt S SSS Header Legend CH L1 L2 L3 L4 Cl C2 C3 C4 R1 R2 R3 R4 gt COUPLING OFFSET BWHI NRx 2 10 11434 lt qstring gt query only This query only link returns a quoted string inditing what type of probe isconnected tothe input Ifa 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 mm Left Center and Right plug in compartments 1 2 3 and 4 mean Channel 1 Chann
17. L STD 4618 FCC Part 15 Subpart J Class A VDE 0871 6 78 Class B Physical Characteristics Table 4 3 Physical Characteristics Characteristic ormation weight max 2 Ib 7 oz 1 1 kg Weight of Packaged Product max 5 Ib 5 oz 24 ke Dimensions max lRefer to Figure 4 1 Recommended Probes Tektronix recommends these probes for use with the 11A34 P6134 Subminiature 10X Passive Probe with ID With 1 MO inputs the P6134 s input impedance is 10 M in parallel with 105 pF The P6134 is a Level 1 probe l P6231 Low Impedance Subminiature 10X Active Probe The P6231 has a bandwidth of 15 GHz input impedance of 450 Q and dc offset of 5 V controlled by the 11A34 The P6231 is a Level 2 probe q 11434 Part 4 Specification 11A34 User s Reference Supplement Physical Characteristics 50 NOTE TOP FIGURES ARE IN MILLIMETERS AND BOTTOM FIGURES ARE NINCHES Figure 4 Dimensions of 11A34 Appendix A Glossary Deflection factor The ratio of input signal to response in the 11000 system The reciprocal of sensitivity Display on off button The front panel plug in button that d
18. Menu 4Ch 3 Ch4 Polarity Waveform Acquisition Waveform Menu Trigger Selection Trigger Source Major Menu and Polarity Position and Offset The 11301 and 11302 oscilloscopes assign position control to the Left Control knob by pressing the VERTICAL POS button 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 eg two divisions above ticule center set by the Position control When using a sensitivity that 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 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 mY division The Offset control range is one volt for all sensitivities from 1 mV to 995 mV divis
19. STANDBY switch r amp the instrument to qualified service personnel When installed in any 11401 11402 plug in compartment or in the 11301 11302 left or center plug in compartment the 1 1A34 will provide a conventional display When installed in thecenter or right plug in compartment of the 11301 11302 the 11 43 i will also provide theX 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 tap 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 11434 from 4 mainframe set the mainframe ON STANDBY switch to STANDBY Then pull the release latch see Fig 1 1 to disengage the unit from the mr tinframe and pull the 11A34 straight out of the plug in compartment 11A34 User s Reference Supplement te REV JUL 1987 11A34 Installing and Removing the 11A34 TOP GROOVE MAINFRAME RELEASE LATCH Figure 1 1 Installing a plug h unit in a mainframe oscilloscope Instrument Options Option 23 includes four P6134 probes Part 1 General Information Packaging for Shipment If this instrument is to be shipped by commercial transportation we recommend that
20. acent to the input connectors Alt other 11A34 functions are controlled through the host mainframe Such mus ontrolled functions are Sensitivity Coarse and Fine over a range of 1 mY to 10 V division Vertical Offset Coupling AC DC or Off Impedance input termination 500 or 1 Mg 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 s Reference manual sopas ov Trigger Channels same as Display Channels see Operating Information section of mainframe User s Reference manual Part l General Information Technical Manuals Contents of this Supplement 11A34 Service Manual Plug in to Mainframe Compatibility Initial Inspec ting Temperature Installing and Removing the 11434 Instrument options Packaging for Shipment Part 2 Operating the 11A34 in 11301 and 11302 M ainframes Display On off s Selecting Coupling HF Limit and Impedance Other Functions Position and Offset DCC ii t Loading Adding Waveforms overdrive Recovery 50Q Overload Active Probe sssssssrsrsonornononnonnonnnnnnnonnnnnnnonnnnnnnonnnnnnnonnnnnnnonnnnnnnannnnnnnannnnnnnannninnnnnnnnnnnna Front Panel Error M essages GPIB and RS 232 C Commands and Syntax Part 3 Qperating the IIA34 in 11401 and 11402 Mainframes Display 0 n 0 ff Other Functions Vertical Offset DC Circuit Loading a
21. cting Channel Input Impedance Vertical Position Selecting Channel Bandwidth Limit Display Polarity vertical Description lUnder Waveform Control in Section 2 Operati g Information 1 1A34 User s Reference Supplement Vertical Offset BW Limit The 11401 and 11402 oscilloscopes tage offset to position the trage on the sereen In YT signal ys 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 sereen center Therefore to examine a potion of the input signal in greater detail use Vert Offset the 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 ara available for each 11A34 cha
22. dB 10 Hz maximum point ae coupled Display Trig and Auxiliary signals REV JUL 1987 Part 4 Specification characteristic 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 Input Disconnect Threshold Input Impedance 50 Q de coupled Input Impedance 1 MQ dc coupled Input Impedance 1 MQ ac coupled Input Bii current 0 tow C TLA34 User s Reference Supplement il H o E si e 4 idl i Electrical Characteristics TABLE 41 cont Electrical Characteristics Performance Requirement INPUT CHARACTERISTICS 500 V de peak ac Derate at 20 dB per decade from 1 MHz to 5 0 V at 100 MHz 500 V de peak ac Derate at 20 dB per decade from 1 MHz to 5 0 Vat 100 MHz 5 Vrms 0 5 W or 05 watt second pulses not exceeding 25 v peak 5 Vrins minimum 50 Q within 1 2 VSWR less than 1 25 1 for V div lt 1v VSWR less than 13 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 MK within 1 2 in series with 0 022 F and in parallel with approximately 15 pF Less than 100 pA REV JUL 1987 Electrical Characteristics TABLE 41 cont Electrical Characteristics Characteristic Perfor
23. ddition Those portions of a trace which are off screen will not be valid when brought back on screen using another channel s input signal or Offset control This general restriction applies to any dual channel oscilloscope Overdrive Recovery Overdrive occurs when any 11434 channel is driven out of its linear range of approximately 45 divisions The 11A34 hes 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 11434 REV JUL 1987 Part 2 Operating the 11A34 in 11301 and 11302 Mainframes Overdrive Recove 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 25 divisions in amplitude 0 1 of 25 V is 25 mV or 25 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 vickdy 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 yalue is its overdrive recovery time Measuring
24. ed DC Accuracy either polarity any HF Limit of 11A34 in 11301 11302 Mainframes with on screen cursors Without Probes WC Offset Ace RRR 100 mV t0995 mV 0 25 e5maV 1V t10 H025 esov With P6134 Probe calibrated from 11301 11302 Calibrator output Volts Div AV WC Ace DC Balance DC Offset Ace OmVto9SmV H1 O eO04div LAT2mV Oi3div 2025 e SmV TV p995V 1 0 O 04div 120mV 0 13div 10V to 100V 1 2V 0 13diy 0 25 0 5V os al e For absolute de accuracy of single point measurements using Offset add the DC Offset Accuracy DC Balance and AV DC Accuracy terma Apply the AV DC Accuracy only to the difference between the Vertical Position setting and the measurement point 11A34 User s Reference Supplement REV JUL 1987 11A34 ul 6 amp been LTBPN 163 Electrical Characteristics TABLE 41 cont Electrical Characteristics Characteristic Performance Requirement DISPLAY cont DEFLECTION FACTOR Sensitivity cont With P6231 Probe calibrated from 11301 11302 Calibrator output Voli AVC Ace DC Balance DC Offeet Ace mV i95mV I 11 00div I HOV 013v H020 2mnvY 2V HLI 00idiv 0100mV 0r3div 10 20 2mV Probe Tip TC term 100 ppm C Enhanced DC Accuracy either polarity any BW Limit of 11A34 in 11401 11402 Mainframes Without Probes VoltwDiv AV DC Ace DC Balance DC Offset Ace im tomy 4 0 9 0 012div H1mV 0 10div e 20
25. ed to GIDEP to provide the requested permission Group Patent Counsel tmp 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 fast 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 3a0000 Sony Tektronix Japan 700000 Tektronix Holland NV Heerenveen The Netherlands Copyright Tektronix Inc 1987 All tights resewed Tektronix products are covered by US and foreign patents issued and pending TEKTRONIX INC SCOPEMOBILE and it 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 502 or 1 M input impedance High resolution calibrated DC offset 0 25 division increment coarse 0 025 division increment fine Fast overdrive recovery Functions Signals applied to the CH 1 CH 2 CH 3 and CH 4 input connectors can be displayed or removed from the display by pressing the display on off buttons adj
26. el 2 Channel 3 and Channel 4 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 af the specified channel Sensitivity is a channel specific command which does not apply to compound waveforms Quoted string data Part 2 Operating the11A34 in 11301 and 11302 Mainframes O perating the IIA 34 in 11401 and 11402 M ainframes 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 channd and signal to be displayed or removed from the display the function toggles When a channel is displayed its label CH 1 CH2 CH3 CH 4 will be lighted Other Functions All other 11434 functions are controlled within the 11401 11402 oscilloscope and their operation is described in the 11401 and 11402 User s Reference manual Table 3 1 shows where to find information about operating the IIA 34 TABLE 1 Functions And Where They Are Described Function Described under Heading Vertical Offset Vertical Size and Position Vertical Sii sensitivity Vertical Size and Position Coupling AC DC Off Selecting Channel Coupling Select 11A34 Channel Displaying Waveforms an alternative to pressing the 11434 display on off button Input Impedance Sele
27. erdrive 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 ig 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 23 Figure 2 4 Overdrive recovery using long top and short bottom cables unterminated Traces are offset twa divisions and the photograph is a double exposure Part 2 Operating the 11A34 in 11301 and 11302 Mainfrarnes 2 509 Overload Active Probes Probe ID When the input impedance is set to 50 and the input voltage substantially exceeds5 Vrms the 11434 will sense the overload disconnect the 502 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 plugin where N 1 2 3 or 4 To reset the input impedance to 50Q first correct the overload condition then select 5002 from
28. esignates a channel for display or removes a channel from the display Mainframe Any 11000 series oscilloscope exclusive of plug in units offset A control that allows the user to subtract a precision voltage from the inpu t signal to vary the position of the displayed signal ON STANDBY The front panel power control on 11000 series mainframes When 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 voltage is applied to the input connector Toggle To switch alternately between two functions e g on and off TLA34 User s Reference Supplement O OI1IA34 A 1 p Overload The condition existing when a potentially damaging Introducing the 11301 and 11302 Programmable Oscilloscopes This book helps the new user learn the concepts of the 11301 11302 and its operation Introducing the 11401 and 11402 Digitizing Oscilloscopes Intended for new users this book explains the concepts of the 11401 11402 and its Operation 11301 and 11302 User s 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 s
29. his instrument was inspected mechanically and electrically before shipment It should be free of mars or scratches and should meet all electrical specifications First inspect the 11A34 for physcial damage incurred in transit Secondly to verify that the instrument is functioning properly perform the Incoming Inspection Procedure shipped with the instrument This brief procedure verifies mose instrument functions and checks the internal auto calibration references If you find instrament damage or deficiency contact your local Tektronix Field Office or representative 1 2 11A34 REV OCT 1987 Part 1 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 temperature3 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 So a al ai ii aiia ai a CAUTION To avoid instrument damage s amp the mainframe ON STAN DBY switch fo STANDBY before installing or removing the 11A 4 If the green indicator fight remains ON when the STANDBY positon is selected the switch has been internally disabled Toremove o reinstall plug in units use the mainframe PRINCIPAL POWER SWITCH rear to shut OFF the power This will prevent damage to eit the plug in or the mainframe To once again enable the ON
30. ion 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 Part 2 Operating the 11 A34 in 1130 and 11302 Mainframes Position and Offset The 11A34 attempts to maintain the user selected offset voltage even though theoffset 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 995 mV and I mV division Two four pole 24 dB octave bandwidth limit low pass filters are available for each 11434 channel The purpose of these filters is to reduce the amplitude of unwanted noise of imteference 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 bigger 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 DC Circuit Loading AC coupling capacitors are connected differently in the 11A52 and 11A71 than in the 11A32 and IlA 34 Figure 2 1 shows this difference CH
31. lockwise will cause this sequence of sensitivities 199 mY 200 mV 202 mV etc Rotating the Fiie control dockwise from 204 mV div will cause the reverse sequence 202 mV 200 mV 199 my etc OFFSET See Deflection Factor Accuracy which precedes this characteristic Range Resolution depend on Deflection Factor as follows between 1 mV and 995 mV div 1 V Coarse and fine resolution are 0 25 div 250 V and 0 025 div 25 uV respectively between 0 1 V and 0 995 V div 10 V Coarse and fine resolution are 025 div 2 5 mV and 0 025 div 250 pV respectively between 1 V and 10 0 V div 100 V Coarse and fine resolution are 0 25 div 25 mV and 0 025 div 2 5 mV respectively 1 A34 User s Reference Supplement Electrical Characteristics 4 4 11434 TABLE 41 cont Electrical Characteristics Characteristic erformance Requirement DISPLAY cont FREQUENCY RESPONSE 0 to 35 C High Freq Limit 3dB point of Display Auxiliary amp Trig si Zin 50Q and calculated Rise Time Type of Mainframe Voits Division 11301 11401 11402 210 mV 250 MHz 250 MHz 300 MHz 300 MHz l ns L ns 1 2 ns 12 ns 5mV 9 95 mV 200 MHz 250 MHz 250 MHz 18ns l4ns L4ns 2 mV 4 98 mV 200 MHz 200 MHz 200 MHz 200 MHz 18ns 18ns 1 8 ns 18 ns 1mV 1 99 mV 150MHz 150 MHz 150 MHz 150 MHz 2 3 ns 2 3 ns 23 ns 2 3 ns High Frequency 3dB point 100 MHz Limit Low Frequency 3
32. mance Requirement MISCELLANEOUS Overdrive Recovery Time 1 mV to 9 95 mV div lt 50 ns to 0 3 0 2 div for Vin of 20V 100 mV to 995 mV div 50 ns to 1 0 for Vin of lt 20 V 1 0 V to 10 0 V div lt 50 ns to 1 0 for Vin of lt 200V Typical Noise 1 0 mV to 1 99 mV div 0 12 div rms 20 mV to 4 98 mv div 0 06 div rms 5 0mvV to 9 95 mV div 0 025 div rms 10 0 mV to 99 5 mV div 0 014 div rms 100 mV to 995 mV div 0 014 div rms 1 0 v to 10 0 V div 0 014 div rms DC Drift with Temperature 200uV C or less at any sensitivity Channel Isolation At least 50 1 display ratio de 300 MHz Common Mode Rejection Ratio At least 20 1 de to 50 MHz 10 div reference signal on each input Probe Compatibility The 11434 is compatible with Level land Level 2 TEKPROBEs IDe drift can be calibrated out by invoking a eiSbration Enhanced Accuracy at any specific operating temperature Amplitude div x V div iy driven channel Display ratio a re Error amplitude div x V div undriven channel ITEKPROBE is Tektronix name for the interface used with probes designed for the 11000 series of oscilloscopes and plug in units TEXPROBEs have output connectors with one or more spring loaded axing pins Two categories of TEKPROBEs are Level 1 A level 1 probe which uses analog ening to indicate the bee acale factor to the plug in unit Level 2 A level 2 probe which uses an EEPROM to store data abou
33. nnel 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 rigger and display signal bandwidths for a channel are always the same The auxiliary trigger is the signal sent to the right plug in compartment DC Circuit Loading AC coupling capacitors are connected differently in the 11452 and 11471 than in the 11432 and 11434 Figure 3 1 shows this difference In the 11452 and 11A71 the coupling capacitor isolates both the input termination and the amplifier from external de voltages However the coupling capacitor in the 11A32 and 11434 does not Part 3 Operating the 1134 in 11401 and 11402 Mainframes IX Circuit Loading 64 11A52 11A71 500 11432 11434 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 502 Impedance mode is selected and input coupling ts set to AC or DC a 509 termination resistance is conard direcily from the 11A34 input connector to ground Takecarethat the CIECULU connected tothe 11A34 input will not be damaged by the 5022 load Switching from MQ to 502 Impedance mode when more than 25 V dc is present at the 12 434 input will exceed the peak input voltage si
34. on sweep rate Now increase the cable length by about three feet for example use a 42 inch length of RG 58 cable Tektronix part 012005701 and observe the new waveform See Figure 3 2 The waveform change js due to skin effect loss in the longer cable What is surprising is that the skin effect loss persists for over 200 ms 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 unterminatedd To observe this use the short cable again and select 1 M amp 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 sarne 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 11434 User s Reference Supplement Overdrive Recoverv Cursors Window Der Him cp Mert Sizes wet dmV div Nert Of fset _ 4 3 i 750W impedance Co k ory o n Fig
35. pecifications description of options and details about using the 11301 11302 with the GPIB and RS 232 C interfam are included here 11401 and 11402 User s Reference manual Similar to item 3 for the 11301 11302 the definitive word about the 11401 11402 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 1 1A34 Service manual includes information needed to check and adjust perform diagnostic troubleshooting repair and otherwise service your mstrument 1 1434 Incoming Inspection Procedure manual verifies that the instrument is Functioning properly 1 1A34 User s Reference Supplement seve T1434 B l
36. pecified 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 Part 3 Operating the 11434 in 11401 and 11402 Mainframes Part 4 Specification Performance The specifications that follow apply when the instrument is in the condition Conditions of Enhanced Accuracy Enhanced Accuracy is obtained by performing an Enhanced Calibration in the specific host mainframe after the system has reached thermal equilibrium which requires 20 minutes warmup Enhanced Accuracy ig indicated on the ert display and remains in effect a6 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 tem ture sensitive my not remain within the limits of these specifications The instrament specifications are valid at an ambient temperature of 0 to 50 c unless otherwise stated TABLE 4 1 Electrical Characteristics Performance Requirement DISPLAY DEFLECTION FACTOR Sensitivity Calibrated Range 1 mV to 10V div Enhanc
37. ponse to probe ID button Dimensions of 11A34 evtvvarv vrrirte Functions And Where They Are Described 3 1 Functions And Where They Are Described 4 1 Electrical Characteristics 4 2 Environmental Characteristics 4 3 Physical CHAT ACTOLES LLC Srnak REV OCT 1987 11A34 User s Reference Supplement Installing a plug in unit in a mainframe oscilloscope Location of AC coupling capacitors in plug in amplifiers Overdrive recovery wing long top and short bottom cables terminated in 500 Traces are offset two divisions and the Photograph is a double exposure sssveecseversnreessnnsssnassanns E ER E TE Overdrive recovery using long top and short bottom cables unterminated Traces are offset two divisions and the photograph is a double exposure nasasa paspa eat E A E O Location of AC coupling capacitors i in 1 pluga in amplifiers Overdrive recovery using short top and long bottom cables terminated in 500 Traces are offset two divisions and the illustration isa composite oftwo waveforms maa aia Overdrive recovery using short top and long bottom cables unterminated Traces are offset two divisions and the illustration is a composite of two waveforms EENS naaananaayap aayan Sequence of decisions nad m select a a new waveform i in response m probe ID button Viaria iai iS yond A Ea eE Dimensions of 11 AJ E EA A E S EEE ES Input disconnect time and threshold waveform srrrnirrrserrereseris A A 7
38. reatly 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 25 V is 25 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 amp me it takes the IIA34 to settle to within a stated fraction of the equilibrium value is its overdrive recovery time Measuring the overdrive recovery time of an 1 1A34 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 11434 Connect the generator s fast rise output to the 11A34 input through a short one foot or less coaxial cable and select 509 input impedance Adjust the puke amplitude to 1 volt Set the 11434 sensitivity to 1 mV division Each division now represents 0 1 of the input signal Trigger the oscilloscope and observe the recovery of the 11434 using 50 ns divisi
39. select 50Q from the Impedance menu Using an active probe such as the 6231 eliminates two options AC Coupling and 1 M amp 2 input impedance Coupling options available when using such a probe are Off and DC the only Impedance available ig 50Q The Probe ID function is the means of selecting how the 11401 or11402 responds to an ID button push of recommended probes The Pmbe 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 mse 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 part of the Utilities subsection in the 11401 and 11402 User s Reference manual Pressing the probe ID button can initiate one of the following operations 1 If the 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 ee Settings option isenabled front panel settings can be sequentially recalled via the Probe ID function The settings must he stored as explained under Stor ag ar 7 Recalling Waveforms in the 11401 and 11402 User s Reference manual If the Probe ID Function in the Probes pop up menu of
40. t the probe s transfer units scale factor and ontput 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 Part 4 Specification Characteristic Ambient Temperature external to main frame Operating within specs 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 s Reference Supplement Environmental characteristics TABLE 4 Environmental Characteristics Information Q to 50 C mainframe ambient AF to 75 C Five days per MIL T 28800C Type III class 5 as described in 3 9 2 2 end 455 122 To 4 570 m 15 000 ft To 15 200 m 50 000 ft MIL T 28800C Sec 45 5 3 1 type IM class 5 MIL T 28800C Sec 4 5 5 4 1 type I class 5 MIL T 28800C Sec 455 4 3 type I class 5 Meets ASTM D999 75 Method A NSTA Project 1A B 1 Meets ASTM D775 61 Paragraph 5 NSTA Project 1A B 2 MI
41. to 199E 3 200E 3 to 498E 3 500E 3 to 995E 3 to1 99 2 to 4 98 5 to 10 Bandwidth 20E6 100E6 300E6 11401 300E6 11402 Impedance 50 1E6 Resolution step size 10E4 20E 4 50E 4 100E 6 200E 4 500E 6 1E 3 2E 3 5fi 3 10E 3 20E 3 50E 3 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 I 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 2 10X probe will change the value 10 ta 100 11A34 User s ReferenceSupplement GPIB and N 232 C Commands and Syntax Header CH1 lt L1 L2 L3 14 01 72 03 4 RLR2 R3 R4 gt cont Legend CH lt L1 L2 L3 L4 Cl C2 C3 C4 RI R2 R3 R4 gt COUPLING OFFSET BW NRx IMPEDANCE SENSITIVITY lt qstring gt query only This query only link returns a quoted string indicating what 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 response is Level 2 lt probe_type gt pa Apiai When nahe eee 3 nor Leve 2 TEKPROBE is connected the query response is NONE L C and R mean Left Center and Right plug in compartments 1 2 3 and 4 mean Channel 1 Channel 2 Channel 3 and Channel 4 respectively i Sets the s
42. ure 3 2 Overdrive recovery using short top and long bottom cables terminated in 50 9 Traces are offset two divisions and the illustration is a composite of two waveforms 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 Part 3 Operating the 11434 in 11401 and 11402 Mainframes Tek Par oo Cursers Window1 3 2750 eee a r Moin 5ans div Main Pos Figure 3 3 Overdrive recovery using short top and long bottom cables unterminatec Traces are offset two divisions and the illustration is a composite of two waveforms 11 A34 User s Reference Supplement 50Q Overload Active Probes Probe ID When the input impedance is set to 50 and the input voltage substantially exceeds 5 Vrms the 1 1434 will sense the overload disconnect the 50 2 input termination and connect the 1 MO termination The Impedance menu will show 1 MQ and the mainfrarne will display the message Input channel N overload on LEFT CENTER RIGHT plugin where N 1 2 3 or 4 To reset the input impedance to 50 2 first correct the overload condition then
43. y 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 toggies When a channel is displayed its label CH1 CH 2 CH 3 or CH 4 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 lb If several traces are displayed select a channel by touching the desired trace description at the top of the at 2 Press any VERTICAL button OFFSET SEE or PG This button press will cause the Control Menu to be displayed Touch the desired function s label Successive touches will change its state 11A34 User s Reference Supplement Other Functions Other 11A34 functions are controlled within the 11301 or 11302 mainframe and their operation is described in detail in Section 2 Operating Information of the 11301 and 11302 User s Reference manual Table 2 1 shows where to find informationabout operating the 11434 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
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