Abstract: A plug-in electronic expansion module for pump electronics of a centrifugal pump for expanding the pump electronics with at least one additional function has a housing having a lower face and connecting formations thereon for attachment to a pump housing of the pump electronics. Electronics in the module housing provide the additional function. A base is provided on the lower face, and an electrical interface connected to the pump electronics includes a flat support projecting tongue-like from the base on the lower face of the module housing through an opening in the pump housing and carrying contact-forming electrical traces.

Abstract: A plug-in electronic expansion module for pump electronics of a centrifugal pump for expanding the pump electronics with at least one additional function has a housing having a lower face and connecting formations thereon for attachment to a pump housing of the pump electronics. Electronics in the module housing provide the additional function. A base is provided on the lower face, and an electrical interface connected to the pump electronics includes a flat support projecting tongue-like from the base on the lower face of the module housing through an opening in the pump housing and carrying contact-forming electrical traces.

Abstract: The invention relates to a receiver arrangement for receiving frequency-modulated radio signals, having a demodulator circuit arrangement (18), which converts and intermediate-frequency signal into a voltage signal, which is applied to an input stage (22) of a signal-processing circuit arrangement (23), and having a clock-signal oscillator (26), which supplies a clock signal for generating a frequency signal for reducing the frequency of a received signal to the intermediate frequency, and relates to a method of adapting a receiving branch of the receiver arrangement to an input stage (22) of a signal-processing circuit arrangement (23) and a self-testing method. To allow the adaptation of the demodulator circuit arrangement to the downstream input stage of a signal-processing circuit arrangement to be carried out without external test signals, a test-signal generator stage (28) is provided, which forms a test signal with a known frequency from the clock signal supplied by the clock-signal oscillator (26).

Abstract: The invention relates to a receiver arrangement for receiving frequency-modulated radio signals, having a demodulator circuit arrangement (18), which converts an intermediate-frequency signal into a voltage signal, which is applied to an input stage (22) of a signal-processing circuit arrangement (23), and having a clock-signal oscillator (26), which supplies a clock signal for generating a frequency signal for reducing the frequency of a received signal to the intermediate frequency, and relates to a method of adapting a receiving branch of the receiver arrangement to an input stage (22) of a signal-processing circuit arrangement (23) and a self-testing method.