Hewlett Packard 608D Generator
Manufacturer:
Model:
608D
Date:
1962
Category:
Group:
Description:
VHF Signal Generator

Information

Model 608D VHF Signal Generator furnishes r-f signals from 0. 1 microvolt to 0. 5 volt over the frequency range from 10 to 420 megacycles. The signals may be amplitude-modulated by internally-generated sine waves or by externally-applied sine waves or pulses. The level of the output signal is regulated by an attenuator which is adjusted by a calibrated front-panel control. The attenuator is calibrated in both volts and dbm and can be read directly to an accuracy of ±1 db over the full frequency range when the 608D is terminated in a 50-ohm resistive load. The 608D includes a crystal-controlled heterodyne Calibrator which permits the operator to adjust the calibration of the frequency dial at 1-mc and 5-mc check points over the frequency range of the instrument. The Model 608D Signal Generator is designed to meet the exacting requirements of precision laboratory work and yet to be equally useful for general applications in the 10- to 420-megacycle frequency range. The equipment can be used for testing, calibrating, and trouble shooting VHF radio equipment and circuits, and for measuring standing-wave ratios, antenna and transmission line characteristics, receiver sensitivity, etc. To obtain utmost accuracy, particular care has been taken in the design of the 608D to hold spurious modulation to a very low value under all operation conditions.

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Service and User Manual
Manual type:
Service and User Manual
Pages:
76
Size:
4.73 Mbytes (4954648 Bytes)
Language:
english
Revision:
Manual ID:
Date:
1962 12 01
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
2017 12 30
MD5:
3d37b6a4047b7356ff2be895ddef4bb8
Downloads:
396

Information

I GENERAL DESCRIPTION ... 1-1 1-1. Introductory ... 1-1 1-2. General Electrical Characteristics • 1-1 n INSTALLATION AND OPERATION- . . .2-1 2-1. Installation ... 2-1 2-2. Mechanical Adjustment of Meter Zero ... 2-1 2-3. Operating Controls,Dials and • Terminals ... ^-1, ; 2-4. Turning on the Equipment ... 2-4 2-5. Continuous-Wave Operation ... 2-5 2-6. Internal Sine-Wave Modulation . . . 2-5 2-7. External Sine-Wave Modulation . . 2-5 2-8. Pulse Modulation ... 2-6 2-9. Crystal-Controlled Beat-Frequency Calibrator ... 2-6 2-10. Signal Generator Loading Considerations ... 2-6 2-11. Fine Freq. Adjust. Control ... 2-8 m THEORY OF OPERATION ... 3-1 3-1. General ... 3-1 3-2. Radio Frequency Oscillator ... 3-1 3-3. Radio Frequency Buffer ... 3-3 3-4. Radio Frequency Power Amplifier . 3-3 3-5. Output Attenuator and R-F Power Monitor ... 3-4 3-6. Xtal (Beat Frequency) Calibrator- • 3-4 3-7. Modulator Section ... 3-5 3-8. Modulation-Measuring Circuits . . 3-6 Section Page m THEORY OF OPERATION (Cont'd) 3-9. Power supply ... 3-6 3-10. Heater Supply Multivibrator . . . 3-7 IV MAINTENANCE ... 4-1 4-1. Introduction ... 4-1 4-2. Cabinet Removal ... 4-1 4-3. Periodic Checks and Routine Care 4-1 4-4. Localizing Trouble ... 4-3 4-5. Power supply Troubleshooting and Adjustment ... 4-3 4-6. System Analysis Check Chart . . 4-3 4-7. Replacement of Electron Tubes 4-9 4-8. Radio Frequency Oscillator Tube Replacement ... 4-9 4-9. Radio Frequency Amplifier and Buffer Tube Replacement . . . 4-11 4-10. Xtal Frequency Oscillator Tube or Crystal Replacement ... 4-12 4-11. Replacement of Power Supply Tubes ... 4-13 4-12. Attenuator Probe Repair and Replacement ... 4-14 4-13. Replacement of Lamp II ... 4-17 4-14. Calibration of Percent Modulation Meter ... 4-17 4-15. OUTPUT VOLT Meter Calibration and RF Power Monitor Service . 4-18 4-16. Calibrator Oscillator Repair . . . 4-20 4-17. Troubleshooting Chart ... 4-20 V TABLE OF REPLACEABLE PARTS • . 5-1

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Service Manual
Manual type:
Service Manual
Pages:
10
Size:
1.09 Mbytes (1147842 Bytes)
Language:
english
Revision:
Manual ID:
Date:
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
2017 12 30
MD5:
ef8d9c8c6179ca99bc7510c1835fba02
Downloads:
1951

Information

Service Notes This Service Note contains information necessary for replacing and recalibrating the output attenuator in the 608A/B/C/D/E/F Signal Generators. The procedure is described for each model, using the appropriate replacement attenuator. This Service Note outlines the procedure for modifying the Model 608C.D VHF Signal Generators for regulated DC filament operation of the RF circuits. The original multivibrator filament Power supply in Some cases caused ripple on the output RF signal from the generator. The DC filament supply prevents this from happening.

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