The Hewlett-Packard Model 606B is a general purpose, high-frequency signal generator. The Instrument is a self-contained unit with all operatinig controls on the from panel. The direct reading frequency, dial is calibrated to an accuracy of 1 percent. An RF output meter indicates RF output voltage level and a percent modulation meter indicates the percent of amplitude modulation for frequencies within the modulation bandwidth.
The amplitude-modulation system provides modulation up to 90% with low distortion and incidental FM. This feature provides a precision distortion check capability for receivers from antenna to output. Modulation capabilities include internal modulation at 400 or 1000 Hz and external modulation from dc to 20 kHz or more, depending on the RF frequency in use. In addition, complex waveform's, square waves, and dc voltages may be used to modulate the signal generator for testing and evaluating filters, networks, amplifiers, and receivers.
Accessories available for use with the Model 606B include the 8708A Synchronizer, the 11507A Output Termination and the 11509A Fuseholder. The Output Termination has three capabilities. It can be used as a 50-ohm termination which reduces the source Impedance to 25 ohms, as a 20-dB attenuator, (10:1 voltage divider) which reduces the source impedance to 5 ohms, or it can be used to simulate an IEEE standard dummy antenna (10:1 voltage division) for precision measurements on receivers.
The Fuse-holder protects the signal generator output attenuator from damage when transceiver type equipment is being tested. If the transmitter is accidentially keyed, the fuse prevents power from being applied to the signal generator RF OUTPUT connector. The Fuseholder requires two type BNC-to-N adapters, UG-201A/U and UG-349A/U (not furnished), unless equipmenit cables are used. The Model 8708A Synchronizer is a frequency stabilizer by means of which the 606B can be phase-locked on any carrier frequisncy with 2 x 10-7 settability.
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