Tektronix 7A18A Instruction Manual Download Page 1 | Manualshive

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Summary of Contents for 7A18A

Page 1: ...ASE CHECK FOR CHANGE INFORMATION AT THE REAR OF THIS MANUAL 7A18A DUAL TRACE AMPLIFIER INSTRUCTION MANUAL Tektronix Inc P O Box 500 Beaverto Oregon 97077 Serial Number 070 4329 00 First Printing OCT 1...

Page 2: ...nd 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...

Page 3: ...hysical Characteristics 1 2 OPERATING INSTRUCTIONS Installation 2 1 Front Panel Controls and Connectors 2 1 General Operating Information 2 2 Basic Applications 2 4 CIRCUIT DESCRIPTION Introduction 3...

Page 4: ...nput Amplifier detailed block diagram 3 2 3 2 Channel 2 Input Amplifier detailed block diagram 3 4 3 3 U270 input combinations for DISPLAY MODE selection 3 5 3 4 Input Output combinations for DISPLAY...

Page 5: ...onductors or between either supply conductor 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 pr...

Page 6: ...personal injury do not touch exposed connec tions and components while power is on Refer also to the preceding Operators Safety Summary 7A18A Disconnect power before removing protective panels solder...

Page 7: ...7A18A Dual Trace Amplifier...

Page 8: ...d Characteristic Performance Requirement Supplemental Information Deflection Factor Calibrated Range 5 mV Div to 5 V Div ten steps in a 1 2 5 sequence Deflection Factor Accuracy Within 2 with GAIN adj...

Page 9: ...chopped between channels Channel 2 only Channel 1 only Follows DISPLAY MODE selection Channel 2 only Characteristics Input R and C Resistance Capacitance AC Product Displayed Noise Tangentially Measur...

Page 10: ...ll unlatch Continue pulling on the latch to slide the 7A1 8A out of the oscillscope FRONT PANEL CONTROLS AND CONNECTORS The following descriptions apply to the controls and con nectors of both Input A...

Page 11: ...rovides means of inverting the CH 2 display UP A positive going signal at the CH 2 input connector de flects the CRT display upward INVERT A positive going signal at the CH 2 input connector de flects...

Page 12: ...MODE Switch Operating Instructions 7A18A The CH 2 POLARITY switch may be used to invert the displayed waveform of the signal applied to the CH 2 input This is particularly useful in added operation o...

Page 13: ...d in detail since each application must be adapted to the requirements of the indi vidual measurements This instrument can also be used for many appliactions not described in this manual Contact your...

Page 14: ...to DC and apply the reference voltage to the input connector Then posi tion the trace to the reference line 5 Set the coupling switch to DC The ground reference line can be checked at any time by swit...

Page 15: ...he amplitude of an unknown signal dis connect the reference signal and connect the unknown sig nal to the input connector Set the VOLTS DIV switch to a setting that provides sufficient vertical deflec...

Page 16: ...the given values Phase Difference 0 3 X 45 The phase difference is 13 5 High Resolution Phase Measurements More accurate dual trace phase measurements can be made by increasing the sweep rate without...

Page 17: ...so the common mode signals are of opposite polarity 7 Adjust the Channel 2 VOLTS DIV switch and VARI ABLE control for maximum cancellation of the common mode signal The signal which remains should be...

Page 18: ...s readout logic for the oscilloscope readout system Data is supplied to the CIRCUIT DESCRIPTION Section 3 7A18A mainframe readout system identifying the polarity deflection factor the uncalibrated sym...

Page 19: ...attenuator contains an adjustable series capacitor to provide correct attenuation at high fre quencies and an adjustable shunt capacitor to provide cor rect input capacitance 3 2 General Input Source...

Page 20: ...e whereas the variable has a 3 0 to 1 range Channel 2 works in an identical manner with Q445 and 0545 in place of Q245 and 0345 Second Cascode Amplifier Circuit Description 7A18A The Second Cascode Am...

Page 21: ...a fixed zero volts approximately dif ference between the collectors Since 50 volts is not applied to the POSITION control in the ADD position of the DISPLAY MODE switch the control setting has no eff...

Page 22: ...tions for DISPLAY MODE and TRIGGER SOURCE switch selections General The Display Mode and Trigger Switching circuit deter mines which input signal Channel 1 or Channel 2 provides the Signal and Trigger...

Page 23: ...t To com pletely check and adjust all parts of this instrument perform both Parts I and II Start the complete procedure by per forming the Adjustment procedure and follow this with the Performance Che...

Page 24: ...least 12 ns and a frequency compensation adjustments Pulse Generator3 of approximately 1 kHz 500 mV into 50 St with a risetime of at least 1 ns to 100 kHz Plug in Extender Provides access to 7A1 8A a...

Page 25: ...ions Purpose Test Equipment Adjustment tools Screwdriver Three inch shaft 3 32 inch bit Used for potentiometer Xcelite R 3323 adjustments Low capacitance 1 1 2 inch shaft Used for variable capacitor T...

Page 26: ...heck Chopped Operation 4 7 11 Check Trigger Source Operation 4 7 Preliminary Procedure for Performance Check NOTE The performance of this instrument can be checked at any temperature within the 01 C t...

Page 27: ...PLAY MODE CH 2 CH 2 AC GND DC DC f Repeat parts b c and d of this step for Channel 2 4 Check Channel 1 and 2 Trace IDENTIFY a Center the crt display vertically with the 7A18A POSI TION control b CHECK...

Page 28: ...uipment a Change the following control settings CH 1 and CH 2 DC AC GND DC CH 1 VOLTS DIV 1 V CH 2 VOLTS DIV 10 mV b Connect the medium frequency generator to the CH 1 input connector with the five na...

Page 29: ...Trigger Source Operation a Change the following control settings DISPLAY MODE ALT TRIGGER SOURCE CH 1 Calibration 7A18A b Connect the Indicator Oscilloscope Cal Out connector to the CH 1 input connec...

Page 30: ...s warmup before proceeding 5 Set the controls as given under Preliminary Control Settings 6 Adjust the Focus and Astigmatism as necessary to obtain a well defined display PART II ADJUSTMENT Location o...

Page 31: ...input connector g Set the DISPLAY MODE switch to CH 1 Fig 4 1 Locations of adjustments used in this procedure k Disconnect all test equipment Calibration 7A18A h Position the display to the center of...

Page 32: ...at each CH 2 VOLTS DIV switch position listed in Table 4 3 for square comer and flat 410 top within 0 15 division Re adjust the generator output at each switch position to provide six divisions of def...

Page 33: ...ST C245 R245 and C275 for optimum square wave response with minimum aberrations Use the low capacitance screwdriver to adjust the variable capaci tors Repeat these adjustments until optimum response i...

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