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Chapter I-General Information 1-1. Introduction 1-1 1-3. General Description 1-1 1-7. Safety Precautions 1-1 1-10. Technical Specifications 1-1 1-12. Functional Description 1-5 1-13. General 1-5 1-15. The Noise Monitor in a Typical Application 1-5 1-17. Auxiliary Outputs 1-6 1-19. Options 1-6 1-21. Accessories 1-7 1-22. Noise Generators 1-7 1-23. Precision Attenuation 1-9 1-24. Test Equipment 1-10 Chapter 11-Installation 2-1. Introduction 2-1 2-3. Unpacking, Inspection and Damage Claims 2-1 2-5. Ancillary Items 2-1 2-7. Rack Mounting 2-1 2-9. Preparation for Use 2-1 2-11. Initial Checkout 2-2 2-14. General 2-2 2-16. Checkout Procedures 2-2 Chapter Ill-Operating Instructions 3-1. General 3-1 3-3. Description of Operating Controls, Indicators and Connectors 3-1 3-5. Set-up Procedures 3-1 3-8. Interconnections 3-1 3-17. Excess Noise Ratio Setting 3-5 3-21. Establishing the Correct Signal Levels 3-5 3-27. Operation 3-7 3-31. Use of Auxiliary Outputs 3-9 3-33. Signal Monitor, Jl, Pin 4 3-9 3-35. External Meter, Jl, Pins 6 and 7 3-9 3-37. Recorder Output, Jl, Pin 8 3-10 3-39. Manual Noise Figure (Temperature) Measurements 3-10 Chapter IV-Theory of Operation 4-1. Introduction 4-1 4-3. General Theory 4-1 4-4. Noise Figure Theory 4-1 4-6. Noise Figure Measurement 4-2 4-8. Operating Noise Figure and Temperature Measurement 4-4 4-11. Functional Description (Automatic Noise Measurement) 4-5 4-15. Circuit Descriptions 4-8 4-17. IF Amplifier 4-9 4-22. Square Law Detector ... — ... 4-9 4-24. Variable Gain Amplifier 4-9 4-25. Synchronous Integrator and Meter Amplifier 4-9 4-26. AGC Amplifier 4-9 4-31. Timing Signal Generator 4-10 4-39. Power Supply Board 4-13 4-41. +12 Volt Regulator 4-14 4-42. -12 Volt Regulator 4-14 4-43. +28 Volt Noise Source Supply 4-14 Chapter V-Maintenance and Adjustments 5-1. General 5-1 5-3. Performance Verification 5-1 5-6. Minimum Operating Level 5-1 5-7. Noise Generator Power 5-2 5-8. Accuracy 5-2 5-10. Checks and Adjustments 5-3 5-13. Power Supply Adjustments 5-5 5-14. IF Adjustments 5-5 , 5-16. Preliminary 5-5 5-17. Procedure 5-6 5-18. Meter Adjustments 5-6 5-20. Auxiliary Output Adjustments 5-6 5-22. Signal Monitor 5-6 5-23. Recorder Output 5-7 5-24. Troubleshooting 5-7 5-26. General Information 5-7 5-27. Tools 5-7 5-28. Transistors 5-7 5-29. Integrated Circuits 5-8 5-30. Logic Family 5-8 5-31. Logic Circuits 5-8 5-32. Analog Gates 5-8 5-33. Operational Amplifiers 5-8 5-34. Printed Circuit Boards 5-8 5-37. Printed Circuit Board Connectors 5-8 5-38. Front Panel Lamps 5-13 5-39. ENR Thumbwheel Switch 5-14 5-40. Troubleshooting Procedures 5-14 5-44. Factory Service 5-14 Chapter Vi-Spare Parts 6-1. General 6-1 6-2. Recommended Spare Parts 6-1 6-3. Replaceable Spare Parts 6-1

This Instruction Manual is for the Ailtech 7310 and Ailtech 7320 System Noise Monitors (SNM), figure 1-1, and contains physical and functional descriptions, installation and inspection procedures, operating and maintenance instructions, and a parts list for each model. All schematics, electrical and assembly drawings are included, as are appendices for the available optional features. Unless otherwise stated, the information provided herein applies to both models.