| 摘要 |
A circuit for balancing an error signal delivered by an apparatus (1). When the apparatus is switched-on initially, the error signal may be large and thereafter change only slowly with time. The error signal may be a signal which is delivered by a measuring sensor and which is independent of the magnitude to be measured. The circuit includes a negative feedback loop (7, 11) which, immediately upon activating or starting the apparatus (1), feeds back a balancing signal which rapidly compensates the error signal. The circuit also includes means for changing the feedback loop (7, 11) when the error signal has been substantially compensated, so that only slow changes in the error signal with a frequency below an upper limit frequency, chosen in dependence on the application concerned, are fed back. |
