Tektronix 7A22 Instruction Manual
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Tektronix 7A22 Instruction Manual

Tektronix 7A22 Instruction Manual

Differential amplifier
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Summary of Contents for Tektronix 7A22

  • Page 2 Contents of this publication may not be reproduced in any form without the written permission of Tektronix, Inc. Products of Tektronix, Inc. and its subsidiaries are covered by U.S. and foreign patents and/or pending patents. TEKTRONIX, TEK, SCOPE-M OBILE, and registered trademarks of Tektronix, Inc.

  • Page 3: Table Of Contents

    7A22 TABLE OF CONTENTS Page Page Section 1 SPECIFICATION Section 2 OPERATING INSTRUCTIONS (COllt) Introduction..... . . Voltage Measurement ..
  • Page 4 7A22 TABLE OF CONTENTS (cont) SECTION 3 SECTION 4 MAINTENANCE (cont) Page CIRCUIT DESCRIPTION (cont) Page Gate Current Compensation Special Parts ... . Input Amplifier ... 3-4 Soldering Techniques.

  • Page 5: Gain

    7A22 TABLE OF CONTENTS (cont) SECTION 5 SECTION 5 PERFORMANCE CHECK! PERFORMANCE CHECK! CALIBRATION PROCEDURE CALIBRATION PROCEDURE (cont) Page (cont) Page Check or Adjust ..L F -3 dB Point ..5-11 AC Step Atten Balance ... 5- 4 CMRR ....
  • Page 6 Fig. 1-1. Type A22 Differential Amplifier. Type 7A22 ®...
  • Page 8 � , it.. Verification Points ." 'a" '" '" � ." � '" 'a" CMRR � � � 5" '" .a" !!.. '" !"...

  • Page 9: Maximum Input Voltage

    Specification-Type 7A22 ELECTRICAL CHARACTERISTICS (con') DC Drift Drift with Time (Ambi­ Characteristic Performance Requirements ent Temperature and . --:-::: :: :, =- -": :: :-':; ;: ::-": :: : Line Voltage Constant) Short Term 5 p. V (P -P) or 0.1 div (whichever...

  • Page 10: Introduction

    POSITION. Will cause nal is amplified. the trace, representing the output of the Type 7A22, to move a small amount When the 'DC button is depressed the when pressed. Aids in identifying the signal is coupled directly to the Input...

  • Page 11: Operating Instructions

    BAL is attempted. Insure that the oscilloscope used and automatic triggering. in conjunction with the Type 7 A22 is correctly cali­ 4. Wait about five minutes for the Type 7A22 and the brated (refer to the oscilloscope manual and that oscilloscope to warm up.
  • Page 12 When the (Internal adjustment). LOW FREQ --3 dB POINT switch is used to limit the low a. Set the Type 7A22 controls as in step 1-a. frequency response of the Type 7 A22, the unit employs AC stabilization. This means that when the switch is set b.

  • Page 13: General Operating Information

    When measuring DC voltages, use the largest deflection test and the Type 7A22. The shield of a coaxial cable is factor (lO Y/DIY) when first connecting the Type 7 A22 to normally used for this purpose.

  • Page 14: High Input Impedance

    6 dB per octave role. Refer concern. to Fig. 2·6. NOTE Varying the bandwidth of the Type 7A22 is useful, for e)(­ When the wire straps are removed, R 111 and R211 low . frequency signal. By reducing ample, when displaying the 20 are disconnected.
  • Page 15 to.) "tJ ." :i" '" �' ..., CMRR at !lV/Div to mV/Div, Inputs DC Coupled Worst-case degradation due to source resistance_ � - -DC- '" o· l> ..., ..., � ....'" � .... . -<...
  • Page 16 � Bandwidth and VOL TS/DiV Error as functions of Source Resistance.., 0;> ..!" ..» ..., ..., '" " " < ..High Impedance <: 1 Mil Input Input Bandwidth HF -3 dB POINT at No external 0.1% �...
  • Page 18 Operating Instructions----Type 7 � "". dB rei 10 Hz ·_·3 dB -3 dB Fig. FREQUENCY RESPONSE as function of HF POINT settings POINT of DC). 2-6. 7A22...

  • Page 19: Voltage Comparison Measurements

    To accomplish this, apply a reference signal to either in­ can also degrade the performance, particularly when low put of the Type 7A22. Set the VOLTS/DIV switch and VARI­ level signals are involved. Electrostatic interference can be ABLE control throughout the subsequent comparisons.

  • Page 20: Dc Offset Operation

    Operating Instructions-Type 7A22 Signal applied to + INPUT. I C J Resultant display. Signal applied to -INPUT. Fig. 2-8. Waveforms showing differential reiection of a common-mode signal. Resultant waveform shows the difference between the two signals. DC Offset Operation Using the DC OFFSET functions:...

  • Page 21: Input Overdrive Indicator

    FETs approaches the differential dynamic range � I.!j - - "- ---._-- of the amplifier. The 7A22 should not be left connected to a circuit if this light is on, as this may mean that a damaging � _ _ circuit voltage is present.

  • Page 22: Trace Identify

    IDENTIFY pushbutton is depressed. The vertical scale factor readout NO TE associated with the 7A22 will change to the word IDENTIFY. If only one divider probe (or two probes with NOTE equal divider ratios) is connected, the deflection factor at the probe tip will be displayed;...

  • Page 24: Circuit Description

    A block diagram description covering the general con­ preamp. The preamp consists of two identical feedback am­ figuration of each circuit in the Type 7A22 is included in plifiers connected in a differential configuration. The over­ this section. Following the block diagram description is a all differential gain is approximately 15.

  • Page 25: Output Amplifier

    Circuit Description-Type 7 A22 Output Amplifier High Frequency 3 dB Point The signal from the LF --3 dB POINT selector is coupled The HF -·3 dB POINT selector switches capacitance across to the gain-switching section of the Ouput Amplifier. This the output of the Gain Switching Amplifier to set the high section of the Output Amplifier is a pair of feedback am­...

  • Page 27: Input Attenuators

    Circuit Description-Type 7A22 pedance of 1 MQ-47 pF is still seen by the signal source. The --input switch, 5201, functions in the same manner as the +input. Strap Input Attenuator (See Schematic +Gate Current To produce the vertical deflection factor indicated on the...
  • Page 29 Circuit Description-Type 7 A22 +0.5 V +0.5 V -+-- Q153 +1 V ..R153 ---•.. _--- Offset Generator -..+0.5V '0.5 V 4 mA to base ----.. � of Q314 R 2 51 ..R 2 53 �.
  • Page 33 Circuit Description-Type 7A22 V oltage-to-current converter � 1---­ ---- - -1 �--- -- ---1 ---- ----- off58t -..• -----� R287 R289 ---- ------ --- - ---------------------- R271 R273 VR270 V lb R270 ..------" .. ----_._------ COARSE...
  • Page 35 The 100X probe will set the bias on Q614 to allow 200 {LA of collector current which will increase the deflection These two actions aid in identifying the Type 7A22 trace factor (in the readout display) by a factor of 100.
  • Page 36 Introduction Visual Inspection Information which will aid in keeping the Type 7A22 op­ The unit should be inspected occasionally for such defects erating at its peak performance is contained in this section. as poor connections, broken or damaged circuit boards, im­...
  • Page 37 Some parts are manufactured or selected Special Parts. by Tektronix to satisfy particular requirements, or are manu­ factured for Tektronix to our specifications. These and most Fig. Removing or replacing component on circuit board.
  • Page 38 Either or both types of switches may be used in the 7A22. The pushbutton switches are not repairable and should be replaced if defective.
  • Page 71 Digitally signed by http://www.aa4df.com...

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