Tektronix 7A12 Instruction Manual Download Page 1 | Manualshive

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Summary of Contents for 7A12

Page 1: ...1 N STFR U GTI O N MAN VAL Serial Number J l V 1 Cr 7A 12 DUAL TRACE AMPLIFIER Tektronix Inc 0 P O Box 500 Beaverton Oregon 97005 Phone 644 0161 Cables Tektronix 070 0977 01 971...

Page 2: ...in your area This procedure will assure you the fastest possible service Please include the instrument Type or Part Number and Serial or Model Number with all requests for parts or service Specificat...

Page 3: ...trols and Connectors 2 1 Abbreviations and Symbols General Operating Information 2 3 Parts Ordering Information Basic Applications 2 5 Index of Electrical Parts List SECTION 3 CIRCUIT DESCRIPTION Intr...

Page 4: ...Fig 1 1 7A12 Dual Trace Amplifier...

Page 5: ...istics listed in Table 1 1 following complete calibration as given in Section 5 The performance check procedure given in Section 5 provides a convenient method of checking instru ment performance with...

Page 6: ...all deflection factors Recommended X10 Probe P6053 6ft Maximum Input Gate 0 4 nA at 0 to 35 C 2 nA at 35 C to Current 50 C IDENTIFY Trace deflects up 0 2 div to 0 4 div Display Noise 250 pV at 5 mV di...

Page 7: ...900 Series With 7700 Series With 7500 Series With 7400 Series 120 MHz 105 MHz I 75 MHz I 55 MHz TABLE 1 2 TABLE 1 3 ENVIRONMENTAL PHYSICAL Specification 7A12 Refer to the Specification for the associa...

Page 8: ...al connection to the channel AC GND DC Four position pushbutton switch DC OFFSET selects signal input coupling mode AC The AC component of the signal is coupled to the amplifier input while the DC com...

Page 9: ...Operating Instructions 7A12 2 2 nld rwmDe x0n cx Fig 2 1 Front Panel Controls uConnectors...

Page 10: ...ions to follow single trace operation using CH 1 applies equally to CH 2 Signal Connections In general probes offer the most convenient means of connecting a signal to the input of the 7A12 A X10 atte...

Page 11: ...differential measurements are to be made 2 4 In the UP position the displayed waveform will have the same polarity as the applied signal and a positive DC voltage will move the CRT trace up In the INV...

Page 12: ...for assistance in making specific measurements with this instrument Peak to Peak Voltage Measurements AC To make peak to peak voltage measurements use the following procedure 3 Set the Coupling switch...

Page 13: ...ctor NOTE To measure a voltage level with respect to a voltage rather than ground make the following changes to Step 4 Set the Coupling switch to DC and apply the reference voltage to the Input connec...

Page 14: ...switch This is the vertical conversion factor Vertical Conversion Factor reference signal amplitude volts vertical deflection X VOLTS DIV setting divisions 5 To measure the amplitude of an unknown sig...

Page 15: ...difference of 0 3 division with a sweep rate of 45 division as shown in Fig 2 4 Using the formula horizontal sweep rate Phase Difference difference X divisions degrees division Substituting the given...

Page 16: ...ol for maximum cancellation of the common mode signal The signal which remains should be only the desired portion of the channel 1 signal EXAMPLE An example of this mode of operation is shown in Fig 2...

Page 17: ...tching stages correspond to the setting of the DISPLAY MODE and TRIGGER SOURCE switches The switching logic stage provides the control signals for the channel switching stages The digital logic techni...

Page 18: ...Q25B and Q27B is a unity gain amplifier stabilized by constant current source 035 In the DC OFFSET coupling mode an offset voltage from about 5 volts to about 5 volts is supplied to the gate of 3 2 Q...

Page 19: ...Fig 3 1 Block representation of U225 Circuit Description 7A12 3 3...

Page 20: ...1 HI LO CH 1 ALT Mode HI LO LO Alternates between CH 1 and CH 2 CH 2 LO LO CH 2 CH 1 HI LO CH 1 ADD Mode LO HI CH 1 and CH 2 added CH 2 LO LO CH 2 CH 1 HI LO CH 1 CHOP Mode LO HI CH 1 and CH 2 added...

Page 21: ...3 General The channel switch circuits provide signal and trigger outputs to the oscilloscope as selected by the DISPLAY MODE and TRIGGER SOURCE switches and associated logic Refer to AMPLIFIERS schem...

Page 22: ...lternated between the HI state and LO state at a rate determined by Mainframe Level is alternated between the HI state and LO state at a rate determined by the setting of the time base Sweep Rate SWIT...

Page 23: ...tching Logic stage Q560 provides feedback to the base of Q565 for regulation of the 3 5 volt output Circuit Description 7A12 INPUT OUTPUT Switches between LO and HI at a rate determined by oscilloscop...

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