Tektronix ASG 100 Генератор
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Модель:
ASG 100
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Описание:
Audio Signal Generator

Информация

INTRODUCTION The ASG 100 Audio Signal Generator was developed by Tektronix to meet the audio testing requirements of commercial broadcasting. The ASG 100 reduces testing time by transmitting short, predefined audio test sequences that produce precise and easily reproduced results in its AUTO mode. It can also transmit source identification, a voice segment (either continually or as part of the AUTO test) and user defined tones. The user defined tones of LINE UP and MANUAL test signal operation provide the continuous signals needed for adjusting audio levels and manual checking of the left/right audio channels. AUTOMATIC AUDIO CHANNEL TESTING Test equipment for sound programming and the sound channels of television programming must be capable of quickly checking the audio signal path to make sure of the circuit's quality. Automatic equipment must be able to rapidly measure the test signal in ways that give repeatable and meaningful test results. To assist in the repeatablity area, standard test signal sequences have been defined. These sequences begin with the necessary components to start the measurement, identify the source of the test signals, and identify the stored automatic test that is to be done. Then the test signal portion of the sequence runs in predefined frequency, level, and timing patterns that permit automated testing of the signal path characteristics. Each of the test signals in the automatic test sequence are used to check on the different parameters that are important to signal quality. The tests have defined sequences for both monaural and stereo audio testing, and are based on Recommendation 0.33 of the CCITT Specification For Measuring Equipment, Volume IV, Series O Recommendations-1988. When used with a CCITT 0.33 compliant receiver, such as the Tektronix VM700A Option 40 or Option 41, the results of the AUTO testing sequence can be documented automatically without the need for human intervention (unless of course, an out—of—tolerance condition is found by the test). The Tektronix VM700A Option 40 and Option 41 receiving and measuring equipment uses the test signals sent by the companion ASG 100 audio signal Generator to measure the following parameters as defined in Recommendation 0.33 for monophonic audio paths. Insertion Gain Frequency Response Distortion Signal-to-Noise Ratio Compandor Linearity Expanded Noise For stereophonic audio paths, additional measurements are done to assure the A/B (left/right) channel parameters of the signal paths are sufficiently matched for proper transmission of the program audio.

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Руководство по техническому обслуживанию
Hасто́льная кни́га тип:
Руководство по техническому обслуживанию
Страницы:
142
Размер:
5.69 Mbytes (5968359 Bytes)
Язык:
english
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Hасто́льная кни́га ID:
070-8546-03
Дата:
Качество:
Электронный документ, ни сканирование, очень хорошо читается.
Дата загрузки:
2019 09 15
MD5:
239d8179001402b784869e7989594ebf
Загрузки:
464

Информация

Table of Contents List of Illustrations ... vi List of Tables ... vii Safety Summary Section 1 Introduction and Specifications Introduction ... 1-1 Automatic Audio Channel Testing ... 1-1 Manual Signal Testing ... 1-2 Line Up ... 1-2 Manual ... 1-2 Remote Control ... 1-2 Specifications ... 1-3 Electrical Characteristics ... 1-3 Environmental Characteristics. ... . 1-6 Mechanical Characteristics ... 1-6 Power Cord Options ... 1-7 Section 2 Operation and Setup Mains Voltage ... 2-2 Freedom of Operation ... 2-2 Front Panel Controls ... 2-2 Functions ... 2-2 ON LINE ... 2-3 SILENCE ... 2-3 VOICE ... 2-3 RECORD (PRESS SILENCE + VOICE) ... 2-3 AUTO ... 2-4 Auto Test Level ... 2-4 Sweep Test Level ... 2-4 LINE-UP ... 2-5 Alternating VOICE and LINE-UP ... 2-5 MANUAL ... 2-5 Tone Tests ... 2-6 Polarity Tests ... 2-6 Multitone Tests ... -2-7 Manual Test Level ... 2-7 Manual Test Frequency ... .2-7 VOLUME ... .2-7 MIC ... 2-7 IDENTIFICATION ... ... 2-7 FREQUENCY ... . .2-8 AMPLITUDE ... 2-8 Arrow Buttons ... ... 2-8 1Ï (Up Arrow), U (Down Arrow) ... 2-9 <= (Left Arrow), => (Right Arrow) ... 2-9 PAUSE AUTO ... 2-9 SAVE ... 2-10 Status Feedback . ... ... 2-10 POWER ... 2-10 Power-On Diagnostics ... 2-10 OUTPUT >775mV(rms) ... 2-11 Display Window ... 2-11 Headphones ... 2-11 REAR PANEL POWER SWITCH AND SIGNAL CONNECTORS ... 2-12 Power Switch ... 2-12 Audio Signal Connectors ... 2-12 Remote Connector ... 2-12 Internal Settings and Setup Editing ... 2-13 Enabling and Disabling Signal Editing ... 2-13 Editing Signal Parameters ... 2-15 Saving Signal Parameters ... 2-15 External Edit Enable ... 2-16 Front Panel and Remote Control Enabling ... 2-17 Setting the Output Impedance ... 2-17 Section 3 Maintenance Lithium Battery ... 3-1 Battery Disposal ... 3-1 Battery Emergency and First Aid Information ... 3-1 Fuse ... 3-2 Preventive Maintenance ... 3-2 Cleaning ... 3-2 Visual Inspection ... 3-3 Static-Sensitive Components ... 3-4 Troubleshooting ... 3-5 Troubleshooting Aids ... 3-5 Foldout Pages ... 3-5 Parts Lists ... - ... 3-5 Major Assembly Interconnection ... 3-6 General Troubleshooting Techniques ... 3-6 Power-On Diagnostics ... 3-7 Corrective Maintenance ... 3-7 Obtaining Replacement Parts . ... 3-7 Removal and Replacement Procedures ... 3-8 Cabinet Removal and Replacement ... 3-8 Front Panel Removal and Replacement ... 3-8 Main Board Removal and Replacement ... 3-8 Power supply Removal and Replacement ... 3-9 Serial Connector EMI Board Removal and Replacement ... 3-10 Section 4 Verification and Adjustment Verification Procedure ... 4-2 Preparation ... 4-2 Procedures ... 4-2 1. Power Up Check ... 4-2 2. Check Frequency Accuracy (±0.1%) ... 4-2 3. Check Amplitude Accuracy (±0.2 dB at 1000 Hz) ... 4-3 4. Check Amplitude Flatness (+0.05/0.2 dB, 10 Hz to 20 kHz) ... 4-3 5. Check Channel-to-Channel Level Difference (< 0.2 dB at +14 dBu) ... 4-4 6. Check Total Harmonic Distortion + Noise (< 0.015%, 20 Hz to 19 kHz < 0.056% > 19 kHz to 20 kHz) ... 4-5 7. Check Signal-to-Noise Ratio (>80 dB at 0 dBu at 1 kHz) ... 4-6 8. Check Channel-to-Channel Phase Difference (<1°, 10 Hz to 20 kHz) ... 4-6 9. Check Loop-Through ... 4-7 10. Check SAVE Operation ... 4-7 11. Check RECORD and Headphones Operation ... 4-7 12. Check Audio/Video Timing Control ... 4-8 13. Check AUTO Test 0.33 and Tek Sequences and AUTO TEST LVL Operation . . .4-8 14. Check AUTO Test Sweep and SweepLev Operation ... 4-8 15. Check Remote Operation ... 4-9 Adjustment Procedure ... 4-10 Preparation ... 4-10 Procedures ... 4-10 1. Check Supply Voltages ... 4-10 2. Adjust Gain ... 4-11 3. Adjust Distortion ... 4-11 Section 5 Theory of Operation Control Processor (Diagram 1) ... 5-1 Front Panel Processor ... 5-1 Reset Circuit U54 and Inverting Buffer ... 5-1 Address Latch (Address/Data Demultiplexer) ... 5-1 RAM ... 5-2 EPROM ... 5-2 Battery Backup ... 5-2 Address Decoder ... 5-2 Front Panel Interface ... 5-2 DIP Switch ... 5-3 Remote Connector ... 5-3 Digital Signal Processor (Diagram 2) ... 5-3 Digital Signal Processor (DSP) ... 5-3 Address Decoder ... 5-4 Control Register Latches ... 5-4 EPROM ... 5-4 DSP RAM ... • ... 5-4 Battery Backup ... 5-5 CODEC ... • ... 5-5 Digital-to-Analog Converter (Diagrams 3 and 3a) ... 5-5 Digital Formatter/Synchronizer ... 5-5 Digital-to-Analog Converters ... 5-5 Low-Pass Filters ... 5-6 Filter Voltage Reference Regulators ... 5-6 Channel 1 and Channel 2 Attenuator (Diagram 4) ... 5-6 Step Attenuators ... 5-6 Attenuation Range Steps ... 5-6 Switching Control Signals ... 5-6 Output Buffers ... 5-7 Gain Switching ... 5-7 Output Impedance Resistor Arrays ... 5-7 Relay Driver ... 5-7 Output Switching Relays ... 5-7 EMI Filters ... 5-8 Control Signals (CTRL0-CRTL3) ... 5-8 PREVIEW (CRTL12) ... 5-8 Headphone Amplifier (Diagram 5) ... 5-8 Input Differential to Single-Ended Amplifiers ... 5-8 Signal/Preview Multiplexer ... 5-8 Channel 1 and Channel 2 Voltage Controlled Amplifiers ... 5-8 Audio Level Control Buffer ... 5-9 Current-to-Voltage Amplifiers ... 5-9 Preview Termination Transistors ... 5-9 Microphone Preamplifier (Diagram 6) ... 5-9 Microphone Input Amplifier ... 5-9 AGC and Output Amplifier ... 5-9 Power Distribution (Diagram 6) ... 5-10 Front Panel (diagram 7) ... 5-10 Serial Filter Board (Diagram 8) ... 5-10 Power supply (No diagram provided) ... 5-10 Section 6 Replaceable Electrical Parts List Section 7 Diagrams Section 8 Replaceable Mechanical Parts List Appendix A Remote Operation Remote Control From a Terminal ... A-l Limited Local Remote Control ... A-l Installation ... A-l Connect a Properly Configured Communications Cable ... A-l Set DIP Switch ... A-4 Set Serial Communication Parameters ... A-4 Setting Baud Rate ... A-4 Remote Operation ... A-6 Remote Commands ... A-7 Command Description ... A-10 Help Commands ... A-10 Queries ... A-ll Unit Identification ... A-ll Special Queries ... A-12 Restoring Defaults ... A-12 Flow Control ... A-12 Remote Command Syntax ... A-12

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