Hewlett-Packard Model 203A Variable Phase Function Generator


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Hewlett-Packard Model 203A Variable Phase Function Generator (Instruction/Service Manual)

The Hewlett-Packard Model 203 A Variable Phase Function Generator is a low frequency function generator which provides two sine wave and two square wave test signals at frequencies from 0.005 cps to 60 kc.

The four test signals are provided at the front panel OUTPUT connectors at an open circuit signal level of 30 volts peak-to-peak. The sine wave and square wave test signals provided at the REFERENCE PHASE OUTPUT connectors are fixed in phase and provide a reference phase for the test signals at the VARIABLE PHASE OUTPUT connectors. The variable phase test signals are continuously variable from 0 to 360 lag with respect to the phase of the reference test signals. The amplitude of the four output signals can be varied with individual continuously variable 40 db attenuators (AMPLITUDE controls.)

The output terminals are floating with respect to ground and can be used to supply an output voltage with either terminal grounded or can be floated up to 500 volts dc above chassis ground. The output impedance for all four test signal outputs is 600 ohms.

The Model 203A can be used for phase shift measurements, vibration studies, servo applications, medical research, distortion measurements, geophysical problems, subsonic and audio testing.

The Model 203A is a beat-frequency oscillator which, by mixing two high-frequency signals, generates signals in the frequency range of 0. 005 cps to 60 kc. One of the high-frequency signals is a fixed frequency; the other is variable. The Model 203 A has two signal channels, REFERENCE PHASE and VARIABLE PHASE, each of which produces a sine-wave signal and a square-wave signal. The two channels are electrically similar except that the VARIABLE PHASE channel contains a continuously adjustable phase-shifting circuit which changes the phase relationship of the VARIABLE PHASE OUTPUT with respect to the REFERENCE PHASE OUTPUT. The four signals (two reference phase and two variable phase) are available simultaneously at the OUTPUT connectors.




Hewlett-Packard Model 203A Variable Phase Function Generator

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