Measuring range selection switch

Measuring range selection switch for a measuring device to selectively divide a measuring voltage into smaller values under control of an external control circuit, comprising a first circuit part of the measuring range selection switch for dividing the measuring voltage into decimal steps, a second circuit part of the measuring range selection switch having an input connected to an output of said first circuit part for dividing the measuring voltage a second time into still smaller steps, said second circuit part including three symmetrically constructed differential amplifier stages each having two transistors, each transistor having only one emitter, current feedback resistors each being connected to a respective one of said emitters, said current feedback resistors respectively connected to said differential amplifier stages to provide said differential amplifier stages with respective preset voltage ratios of steps smaller than decadic steps between input and output voltage, a blocking transistor for each differential amplifier, each blocking transistor connected to said respective feedback resistor, a constant current source connected in common to all of said differential amplifier stages, the control circuit connected to said blocking transistors for selectively causing one of said blocking transistors to remain in conduction and to switch on only said respective differential amplifier stage supplied through said one blocking transistor with current, so that one attenuation step combined with one amplification ratio is selected for the measurement, a common output and a common input connected to all of said differential amplifier stages, wherein said measuring range selection switch has an output stage including a pair of emitter followers.