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Keithley Manuals
Synthesizer
3940
Service manual
Keithley 3940 Service Manual
Multifunction synthesizer
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:
Operator's manual
(127 pages)
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Contents
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Table of Contents
Table of Contents
SECTION 1 - Performance Verification
Introduction
Environmental Conditions
Linepowervoltage
Recommended Test Eqtjipment
Frequency and Duty Cycle Accuracy
Amplitudeaccuracy
Frequency Response (Sine)
Table 1-4 Limits for Frequency Response (Sine)
Table 1-5 Limits for Frequency Response (Triangle, Sawtooth, Square)
Frequency Response (Triangle, Sawtooth, Square
Frequency Response (Sub Sine
Total Harmonic Distortion
Table 1-7 Limits for Total Harmonic Distortion
Table L-8 Limits for DC Voltage Accuracy
Dcvoltageaccuracy
SECTION 2 - Principles of Operation
Introduction
Blockdiagram
Controlsection
Display and Keyboard Section
Trigger Section
Sweepsection
Subsynthesizer
Mainsynthesizer
Powersupply
Mainsynthesizerdescril?Tion
Main Synthesizer Block Diagram
D/Aconverter
Squarewavegenerator
Amplitude Control
Outputamplifier
Calibration
Figure 2-2 Main Synthesizer Block Diagram
Figure 2-3 Frequency Synthesizer Address Generator Diagram
Synthesizer Operating Principles
Figure 2-4 Address Generator Waveform
Figure 2-5 Waveform Memory and D/A Converter
SECTION 3 - Service Information
Introduction
Linefusereplacement
Calibration
Linepower
Cover Removal
Table 3-2 Recommended Test Equipment for Calibration
Calibrationprocedures
Figure 3-4 Sub Synthesizer Output Connections to Model 197A DMM
Figure 3-5 Main Synthesizer Output Connections to Timer/Counter
Coverreplacement
Figure 3-7 DMM Connections to DC OFS and GND Test Points
Fanfiltercleaning
Rechargeable Battery Replacement
Repair
Factory Service
Powersupplytestpoints
Figure 3-8 Power Supply Test Points
Board-Levelrepair
Replaceableparts
Partslist
Orderingparts
Table 3-3 Board Level Repair Summary
Table 3-4 Replaceable Parts
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Operator's Manual
9
ultif unctio
mice
mud
ontains Servicing Information
Publication Date: August 1991
Document Number: 3940-902-01 Rev. A
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