Panasonic VP-7721A Manual

(1) Minimize the output power of the amplifier under measurement wheninterconnection lead wires are connected or disconnected.(2) Do not disconnect the "Common" lead in Fig. 4—14 during measurement.If it is required, disconnect "Output line" or connection betweenthe load RL and the VP-7721A prior to the "Common" lead.(3) When it is required to provide a measurement fixture, such as signalselector switch, insert it between the load RL and the VP—7721A.If it is essential to insert such a fixture between the amplifier andthe load RL, the switching timing should be so arranged that the commonside is switched during the disconnected period of the "Output line".(4) Never connect'a BTL type (balanced, transformer-less type) poweramplifier to the input connector in non—floating arrangement. Use thefloating connection for this type of amplifier.4.5 Distortion Measurement using Internal Oscillatora) Basic operation is the same as that described in Section 4.3.Connect the device to be tested to the analyzer as shown rn Fig.4_15^ in this connection, the analyzer acts as an automatic tuningdistortion measurement set.VP-7721A audio analyzerFig. 4-15 Distortion measurement connection using internal oscillatorOlQCMnCJ.n4-29