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Tektronix 2465, Instruction Manual

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Tektronix 2465 Instruction Manual Download Page 56

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Tektronix Service Manual

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Summary of Contents for 2465

Page 1: ...ton Oregon 97077 070 3832 00 Product Group 38 COMMITTEDTO EXCELLENCE PLEASE CHECK FOR CHANGE INFORMATION AT THE REAR OF THIS MANUAL OSCILLOSCOPE OPERATORS INSTRUCTION M A N U A L Serial Number First Printing SEP 1982 Revised AUG 1985 ...

Page 2: ...price change privileges are reserved 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 sequentially and are unique to each instrument Those manufactured in the United States have six unique digits The country of manufact...

Page 3: ... Berechtigung zur ijberprufung der Serie auf Einhalten der Bestimmungeneingeraumt TEKTRONIX NOTICE to the userloperator The German Postal Service requires that Systems assembled by the operatorluser of this instrument must also comply with Postal Regulation Vfg 104611984 Par 2 Sect 1 HlNWElS fijr den BenutzerIBetreiber Die vom Betreiber zusammengestellte Anlage innerhalb derer dies Gerat eingesazt...

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Page 5: ...PACITOR PRECHARGING 4 2 EXTERNALTRIGGERING 4 2 ADJUSTMENTS INTRODUCTION 5 1 INITIAL SETUP 5 1 TRACE ROTATION ADJUSTMENT 5 1 ASTIGMATISM ADJUSTMENT 5 2 AUTO DC BALANCE ADJUSTMENT 5 2 PROBE LOW FREQUENCY COMPENSATION 5 2 MATCHINGCHPrNNEL2DELAY 5 3 AMPLITUDE CHECK 5 4 TIMINGCHECK 5 4 SECTION 6 BASIC APPLICATIONS INDEX OF PROCEDURES 6 1 VOLTAGE MEASUREMENT 6 1 VOLTAGE RATIO 6 2 ALGEBRAIC ADDITION AND ...

Page 6: ...lay locations 3 11 4 1 Graticule measurement markings 4 1 5 1 Probe low frequency compensation 5 3 Table Instantaneousdc levels 6 1 Voltage ratios 6 2 Eliminating common modesignals 6 3 Measuring rise times 6 4 Time difference between two time related pulses cursor method 6 5 Time ratios duty cycles 6 6 Phase difference between two time related signals 6 7 Small angle phase difference 6 7 Time dif...

Page 7: ...ctor and ground A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation Grounding the Product This product is grounded through the grounding conductor of the power cord To avoid electrical shock plug the power cord into a properly wired receptable before con necting to the product input or output terminals A protective ground connection by...

Page 8: ...2465 Operators The 2465 Oscilloscope ...

Page 9: ...rtain auxiliary information The 2465 Oscilloscope is shipped with the following standard accessories Probe packages Snap lock accessories pouch Zip lock accessories pouch Operators manual Power cord installed 2 A 250 V fuse Clear plastic crt filter Blue plastic crt filter installed Front panel cover Operators pocket referencecard For part numbers and further information about both standard and opt...

Page 10: ...st 12 5 V per division Frequency Response 1 5 to 5 5 2 mV I DCto 100 MHz I DCto 100 MHz Six division reference signal from a terminated 5 0 4 system with VAR VOLTSIDIV control in calibrated detent VOLTSIDIV setting AC Coupled Lower 3 dB Point 1X Probe 5 mV or greater 5 mV or greater 10 Hz or less 3 dB bandwidth with standard accessory probe or internal 50 SZ termination 1O X Probe 4 7 dB bandwidth...

Page 11: ...table through a range of at least 500 ps to 500 ps 400 V dc peak ac 800 V p p ac at 10 kHz or less 1 3 1 or less 5 V rms 0 5 W seconds during any 1 s interval for instantaneous voltage from 5 V to 50 V Maximum pulse duty factor and maximum pulse duration for a one second interval that produce 0 5 W seconds into 50 Q input with a 5 V rms maximum allowable input voltage are determined from the follo...

Page 12: ...n the graticule area Reduces upper 3 dB bandpass to a limit of 13 MHz to 24 MHz Chopped Mode Switching Rate Vertical display switches sequentially through the selected channels at the chop switching rate If the B SECIDIV switch is set to sweep speeds outside the range of 20 ps per division to 2 ps per division the switching rate is 1 MHz 0 2 dual channel cycle rate of 500 kHz If the B SECIDIV swit...

Page 13: ...itch set to 5 ns XI0 MAG on and 5 divisions of amplitude LEVEL Control Range Channel 1 or Channel 2 Source 18 times the VOLTSIDIV switch setting Channel 3 or Channel 4 Source 9 times the VOLTSIDIV switch setting LEVEL Control Readout Accuracy for triggering signals with transition times greater than 20 ns Channel 1 or Channel 2 Source DC Coupled 15 C to 35OC Within 3 of setting 3 of p p signal 0 2...

Page 14: ...um sweep speed to 0 5 ns per division 50 ms per division to 5 ns per division in a 1 2 5 sequence of 22 steps XI0 MAGfeature extends maximum sweep speedto 0 5 ns per division Timing Accuracy 15OC to 35OC SECIDIV switch set to 0 1 s per division or less A and B Sweep Accuracy Time Intervals Unmagnified Measured at Vertical Center with SECIDIV VAR Control in Detent 2 0 7 of time interval 0 6 of full...

Page 15: ... 9 95 times the A SECIDIV switch setting Main sweep triggering event is observable on delayed sweep with zero delay setting Same as Channel 1 Same as Channel 1 Same as Channel 1 Dc to 3 MHz Same as Channel 1 1O or less from dc to 1 MHz 3 or less from 1 MHz to 2 MHz 0 2 division or less compression or expansion of two division center screen signal when positioned within the display area CURSOR AND ...

Page 16: ...r 25 of period 10 ns or less 20 mV per division t_ 10 into 1 MQ 10 mV per division k10 into 50 Q k 10 mV into 50 Q when dc balance has been performed within 5 C of the operating temperature 2 4 V to 5 V positive goingpulse starting at 0 V to 0 4 V Will supply 400 PA during HI state will sink 2 mA during LO state CRT Source Voltage Display Standard Phosphor Nominal Accelerating Potential Ranges 80 ...

Page 17: ... 30 C and 55 C Shock operating and nonoperating 50b halfsine I I rns duration three shocks on each face for a total of 18 shocks Transit Drop not in shipping package EM1 electromagnetic interference 12 inchdrop on each corner and each face MIL T 28800C para 3 9 5 2 and 4 5 5 4 2 Bench Handling with and without cabinet installed Meets MIL T 28800C MIL STD 461B part 4 CE 03 and CS 02 part 5 CS 06 an...

Page 18: ...h Without Accessories Pouch Width with handle Depth With Front PanelCover With Handle Extended Cooling Finish Construction Description 10 2 kg 22 4 Ib 9 3 kg 20 5 Ib 190 mm 7 5 in 160 mm 6 3 in 330 mm 13 0 in 434 mm 17 1 in 505 mm 19 9 in Forced aircirculation Tektronix Blue vinyl clad material on aluminum cabinet Aluminum alloy chassis sheet metal Die cast aluminum front panel Glass laminatecircu...

Page 19: ...s secured to the rear panel by a cord set securingclamp The protective ground contact on the plug connects through the power cord protective grounding conductor to the accessible metal parts of the instrument For electrical shock pro tection insert this plug into a power source outlet that has a properly grounded protective ground contact see Figure 2 I is set for the correct nominal ac input Inst...

Page 20: ...t may be used but refer it to a qualified service technician for repair of the problem a t the earliest convenience Additional information on the power up tests may be found in Appendix A a t the rear of this manual Consult your service department your local Tektronix Service Center or nearest Tektronix representative if additional assistance is needed REPACKAGING FOR SHIPMENT If this instrument i...

Page 21: ...A Line Voltage Selector setting Option A1 Option A2 Option A3 Option A4 Option A5 BS 1363 IEC 83 IEC 127 Itage Range AC Australian 240V 10A AS C112 IEC 127 Factory Installed instrument Fuse ANSl C73 20 NEMA 6 15 P IEC 83 UL 198 6 North American 240V 15A Fuse Holder CapC Switzerland 220v 6A Reference standardsb SEV IEC 127 a A 6A T V D C fuse is also installed inside the plug of the Option A2 power...

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Page 23: ...rotation from midrange increases the readout intensity and enables the scale factor display counterclockwise rotation from midrange also increases the intensity but disables the scale factor display Delta Volts and Delta Time readouts and control messages will continue to be enabled even when the scale factor display is disabled ASTlG Control Operator adjusted screwdriver con trol used in conjunct...

Page 24: ...put coupling capacitor to prevent a sudden shift of the trace if AC input coupling is selected later 1 MSt DC All frequency components of the input signal are coupled to the vertical attenuator lnput resistance is 1 MSt to ground 1 MSt GND In this position the switch operates exactly the same a s previously described 50 St DC All frequency components of the input signal are coupled to the vertical...

Page 25: ... and 2 5 MHz depending on the SECIDIV switch setting At all sweep speeds the chop switching rate is desynchronized with the sweep frequency to minimize waveform breaks when viewing repetitive signals OUT ALT released out When more than one channel is selected the vertical display switches sequentially through the selected channels Alter nate switching occurs during sweep retrace times If both A an...

Page 26: ...loscope Hookup is made via a banana tip connector HORIZONTAL AND DELTA MEASUREMENT Refer to Figure 3 4 for items 23 through 33 A SECIDIV Switch Selects 25 calibrated A Sweep speeds from 0 5 s per division to 5 ns per division or delay ranges from 5 s to 100 ns in a 1 2 5 sequence Extreme counterclockwise switch rotation selects the X Y display mode In X Y the signal applied to the CH 1 OR X input ...

Page 27: ...A Sweep indicates the approximate delay of the B Sweep and the length of the intensified zone indicates the approximate B Sweep duration set by the B SEC DIV switch If either At or l At is also activated intensified zones and associated B Sweeps will be established in the same manner a s described in PULL INTEN PUSH B Pushing in the B SECIDIV knob when the B SECIDIV switch is set to a faster sweep...

Page 28: ...t push button cancels the function When the A and B SECIDIV knobs are locked together A trace only two vertical cursors are superimposed on the crt display while the Delta Time function is active In any of the delay time Horizontal Display modes PULL INTEN TURN ALT or PUSH B two separate delay times are established by the Delta Time function One cursor position or delay time is set by the A REF OR...

Page 29: ...VL Automatically establishes the trigger level on a triggering signal and free runs the sweep in the absence of a triggering signal The LEVEL control covers a range between the positive and negative peaks of repetitive triggering signals If the triggering signal amplitude changes the trigger level does not change unless a trigger is no longer produced a t the established level The signal peak refe...

Page 30: ...VERTICAL MODE is selected each displayed channel in turn provides the triggering signal and the respective LED indicator for each displayed channel is illuminated except in the case of AUTO LVL MODE triggering For AUTO LVL triggering or CHOP VERTICAL MODE the lowest numbered channel or ADD if it is displayed is the triggering signal source The LED indicator for the lowest numbered channel displaye...

Page 31: ...V knob is unlocked from the A SECIDIV knob the trigger controls remain directed to the A Trigger until the B Trigger is reselected by the A B TR IG switch LEVEL Control Sets the amplitude point on the triggering signal at which either A or B Sweep triggering occurs This control produces fine resolu tion for a portion of its range after which it changes to coarse resolution It reenters the fine res...

Page 32: ...l produce noticeable modulation on a normal intensity trace Modulating signals with fast rise and fall times produce the most abrupt intensity changes External Z axis signals must be time related to the displayed signal frequency to obtain a stable intensity modulation pattern on the crt Optional PROBE POWER Connectors Provide out put power for using Tektronix active probes Fuse Holder Contains th...

Page 33: ...ppears only if the following con ditions exist a single vertical channel is selected a s the trigger source the vertical input coupling is not AC the VOLTSIDIV VAR control of the source channel is in the calibrated detent and trigger coupling is either DC or NOISE REJ A question mark may appear in a DLY delay time a At delta time or a l A t readout when the SECIDIV knobs are unlocked not with curs...

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Page 35: ...e a photograph for viewing the left side of the graticule The At and AV cursors provide for better accuracy and easier operation than using the graticule and they should be used in most measurement situations Use of the cursors avoids vertical and horizontal gain errors and crt linearity errors Cursors also eliminate the inconvenience of counting and interpolating graticule markings 1ST OR LEFT VE...

Page 36: ... to the input connectors but they may have considerable effect on the accuracy of a displayed waveform To maintain the original frequency characteristics of an quality low loss coaxial cables cables should be terminated a t acteristic impedance If this is impedance matchingdevices applied signal only high should be used Coaxial both ends in their char not possible use suitable INPUT COUPLING CAPAC...

Page 37: ...COUPLING SLOPE Fully counterclockwise Midrange AUTO LVL VERT DC 3 Adjust the INTENSITY and READOUT INTENSITY controls for desired display and readout brightness and best trace definition 4 Adjust the Vertical and Horizontal POSITION controls to position the trace within the graticule area 1 Press in the POWER switch button ON and allow the instrument to warm up 20 minutes is recommended for maximu...

Page 38: ...ns valid as long as the instrument is operating within 5 C of the ambient temperature at which the adjustment was performed provided a 20 minute warm up period is allowed before performing the adjustment To initiate the adjustment set both the Channel 1 and Channel 2 input coupling switches to AC Then simultaneously push up on both switches An alternate method of entering the auto adjustmentmode i...

Page 39: ...he other three channels This adjustment is most com monly used to eliminate delay differences between Chan nel 1 and Channel 2 that may be introduced by the probes and has no effect on common mode rejection when ADD VERTICAL MODE is selected Matching Channel 1 and Channel 2 delay is accomplished as follows 1 Preset the instrument controls and obtain a baseline trace as described in Initial Setup 2...

Page 40: ... obtain a stable display output 3 Adjust the Channel 1 POSITION control to center the display on the screen 4 Adjust triggering controls to obtain a stable display 5 CHECK Amplitude of the CALI6RAT0R signal is between 3 88 and 4 12 divisions as measured on the center vertical graticule line 6 Repeat this procedure using the Channel 2 connector and controls 5 CHECK Timing accuracy by confirming tha...

Page 41: ... to make voltage measure ments between any two points on a waveform e g ac peak to peak voltages instantaneous voltage levels and pulse heights 1 Preset instrument controls and obtain a baseline trace 2 Aplply the signal to either the CH 1 OR X or the CH 2 input connector and select the VERTlCAL MODE switch to display the channel used that the VOLTSIDIV VAR control is in the calibrated detent 4 Ad...

Page 42: ...R X or the CH 2 input connector and select the VERTICAL MODE switch to display the channel used 3 Set the appropriate VOLTSIDIV switch to display more than five divisions of the waveform 4 Adjust the A TRIGGER LEVEL control to obtain a stable display 5 Adjust the appropriate VOLTSIDIV VAR control so that the reference portion of the waveform is exactly five divisions NOTE The VOLTS DIV switch and ...

Page 43: ...obe 2 Do not apply signals that exceed the equivalent of about eight times the VOL TS DIV switch settings since large voltages may distort the display For example with a VOLTS DI V switch setting of 0 5 the voltage applied to that channel should not exceed 4 v 3 Use Channel I and Channel 2 POSITION control settings which most nearly position the signal on each channel to midscreen when viewed sepa...

Page 44: ...the A REF OR DLY POS control and the Delta cursor is positioned by the A control A crt readout in the upper right hand corner of the screen displays the time difference between the two cursors Changing the SECIDIV switch position auto matically changes the readout scale RISE TIME REFERENCE CURSOR DELTA CURSOR Figure 6 4 Measuring rise times 8 Read the time difference between the two cursors from t...

Page 45: ...ther one but not both of the signals or a third time related signal is the triggering signal source 4 Activate the Delta Time measurement function and set the cursors to similar reference points such as leading edges on the two signal displays see Figure 6 5 5 Read time difference from the crt readout TIME DIFFERENCE REFERENCE CURSOR DELTA CURSOR 3832 17 Figure 6 5 Time difference between two time...

Page 46: ...ase difference between two time related signals use the following procedure 1 Preset instrument controls and obtain a baseline trace 4 Set the Channel 1 and Channel 2 VOLTSIDIV switches and adjust the VAR controls to obtain equal amplitudes of the reference and the comparison signals 5 Use the Vertical POSITION controls to center both displays vertically within the graticule area 6 Set the A SECID...

Page 47: ... position and length of the intensified zone indicates the delay time position and the B Sweep interval respectively A DLY readout appearing in the crt display gives the time delay between the start of the A Sweep and the start of the B Sweep Positioning the intensified zone to a point of interest on the A Sweep trace is accomplished using the A REF OR DLY POS control Rotating the control continu ...

Page 48: ...ad of aligning the start of the zones to the measure ment points both the Reference and the Delta delays are adjusted to overlay the two points precisely using the respective B Delayed traces An example application of this method is given in the following procedure 5 Delayed Horizontal Display Mode Once the point of interest to be examined or measured is This procedure describes the steps necessar...

Page 49: ... SECIDIV knob 13 Center the 6 Delayed traces vertically using the Channel VERTICAL POSITION controls and the TRACE SEP control as necessary 9 Activate the Delta Time measurement function by momentarily pressing the At switch select the independent mode of delay time positioning TRACKINGIINDEP button out 14 Adjust both the A REF OR DLY POS control and the A control to superimpose the measurement po...

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Page 51: ...ided in the front panel of the rackmounted instrument These enable con venient accessing of the four BNC connectors CH 2 SIGNAL OUT A GATE OUT B GATE OUT and EXT Z AXIS IN and the two PROBE POWER connectors located on the rear panel Additional cabling and connectors required to implement any front panel access to the rear panel connectors are supplied by the user however these items can be separat...

Page 52: ... 4180 00 159 0021 00 161 0104 00 378 0199 00 378 0208 00 200 2742 00 200 2265 00 OPTIONAL ACCESSORIES The following optional accessories are recommendedfor use with the 2445 Oscilloscope Description Part Number ProtectiveCover Waterproof Blue Vinyl 016 0720 00 Probe Package use with standard accessory probes for added input signal connections Rackmounting Conversion Kit Rear Support Kit for use wi...

Page 53: ...dicated in the bottom line of the crt readout The failure display has the following format TEST XX FAIL YY where XX is the two digit hexadecimaltest number and YY represents the failure code for the failed test Brief descriptions of the tests are listed in Table A I A Confidence test failure may not render the instrument inoperable The instrument may still be placed into the operating mode by pres...

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Page 55: ...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 all changes are permanently entered some duplication may occur If no such change pages appear following this page your...

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