Kenwood CS-1022 Instruction Manual

Also see for CS-1010: Instruction manual

APPLICATION OF X-Y OPERATIONCS-1022, 1021, 1012 CS-1020, 1010* Phase Shift MeasurementA method of phase measurement requires calculations bas-ed on the Lissajous patterns obtained using X-Y operations.Distortion due to non-linear amplification also can bedisplayed.A sine wave input is applied to the audio circuit beingtested. The same sine wave input is applied to the verticalinput of the oscilloscope, and the output of the tested cir-cuit is applied to the horizontal input of the oscilloscope.The amount of phase difference between the two signalscan be calculated from the resulting waveform.To make phase measurements, use the following pro-cedure.1. Using an audio signal generator with a pure sinusoidalsignal, apply a sine wave test signal at the desired testfrequency to the audio network being tested.. Set the signal generator output for the normal operatinglevel of the circuit being tested. If desired, the circuit'soutput may be observed on the oscilloscope. If the testcircuit is overdriven, the sine wave display on theoscilloscope is clipped and the signal level must bereduced.. Connect the channel 2 probe to the output of the testcircuit.. Select X-Y operation by placing the TRIG MODE switchin the X-Y position.. Connect the channel 1 probe to the input of the test cir-cuit.(The input and output test connections to the verticaland horizontal oscilloscope inputs may be reserved.). Adjust the channel 1 and 2 gain controls for a suitableviewing size.. Some typical results are shown in Fig. 26.If the two signals are in phase, the oscilloscope trace is astraight diagonal line. If the vertical and horizontal gainare properly adjusted, this line is at a 45° angle. A 90°phase sift produces a circular oscilloscope pattern.Phase shift of less (or more) than 90° produces an ellip-tical oscilloscope pattern. The amount of phase shiftcan be calculated from the oscilloscope trace as shownin Fig. 25.Fig. 25 Phase shift calculation* Phase Shift MeasurementPhase measurements may be made with an oscilloscope.Typical applications are circuits designed to produce aspecific phase shift, and measurement of phase shiftdistortion in audio amplifiers or other audio networks.Distortion due to non-linear amplification is also displayedin the oscilloscope waveform.A sine wave input is applied to the audio circuit beingtested. The same sine wave input is applied to the verticalinput of the oscilloscope, and the output of the tested cir-cuit is applied to the horizontal input of the oscilloscope.The amount of phase difference between the two signalscan be calculated from the resulting waveform.To make phase measurements, use the following pro-cedure.1. Using an audio signal generator with a pure sinusoidalsignal, apply a sine wave test signal at the desired testfrequency to the audio network being tested.. Set the signal generator output for the normal operatinglevel of the circuit being tested. If desired, the circuit’soutput may be observed on the oscilloscope. If the testcircuit is overdriven, the sine wave display on theoscilloscope is clipped and the signal level must bereduced.. Connect an external horizontal input cable from the out-put of the test circuit to the EXT TRIG INPUT jack of theoscilloscope.. Set the TRIG MODE switch to X-Y position for X-Yoperation.. Connect the VERT. INPUT probe to the input of the testcircuit. (The input and output test connections to thevertical and horizontal oscilloscope inputs may bereversed. Use the higher vertical gain of the oscilloscopefor the lower level signal.). Adjust the vertical and horizontal gain controls for asuitable viewing size.. Some typical results are shown in Fig. 26.If the two signals are in phase, the oscilloscope trace is astraight diagonal line. If the vertical and horizontal gainare properly adjusted, this line is at a 45° angle. A 90°phase sift produces a circular oscilloscope pattern.Phase shift of less (or more) than 90° produces an ellip-tical oscilloscope pattern. The amount of phase shiftcan be calculated from the oscilloscope trace as shownFig. 25 Phase shift calculation27

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