Abstract: A circuit arrangement for the processing of physiological measuring signals, in which there is provided a plurality of input amplifiers each having a positive and a negative input, whose output signals control a signal reproducing arrangement, and which are each connected to a collector electrode. Connected to the positive inputs of the input amplifier are the collector electrodes for the signals, and that resistors are located between the negative inputs and the outputs of the input amplifiers, the negative inputs being connected across resistors with a common potential junction, and that the two inputs of a differential amplifier are connected to the outputs of respectively two input amplifiers, the output signal of the differential amplifier controlling the signal reproducing arrangement, and in which the common potential junction is connected to the collector electrode.

Abstract: A circuit arrangement for the processing of physiological measuring signals, including a plurality of input amplifiers having branch signal electrodes connected thereto and to which there are subsequently connected differential amplifiers, each of the latter being connected to the outputs of at least two input amplifiers by means of a program selector and pursuant to a preselected program, and in which it becomes possible to effect a screening or testing of the various circuit elements and, thereby, also of the input amplifiers. A manually controllable calibrating impulse generator is connected to the inputs of all input amplifiers so as to increase the input voltages of the input amplifiers, each differential amplifier including an additional calibrating input to which there is transmissible a calibrating signal from the calibrating impulse generator and wherein, in each differential amplifier, the signal at the calibrating input is superimposed on the differential signal.