Abstract
When output and input of a d.c. valve amplifier with amplification factor μ and input-voltage zero error z are connected to each other, establishing a negative-feedback system, the resulting input-output voltage equals z with an error ≈ z/μ. This voltage is used to charge a capacitor which is then inserted in the input circuit, reducing the zero error from z to ≈ z/μ. For continuous operation (recording), the process is repeated at suitable intervals, thus eliminating the effect of zero drift. A similar method is described to compensate the amplifier input current (i.e. grid current + leakage). One possible application is a megohmmeter in which the reading is directly proportional to the resistance.
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