| 摘要 |
<p>The circuit has an amplifier to whose input measured current is aplied, and a negative feed-back resistor connects its output to the inverting input. The resistor carries a current about equal to the current to be measured. A second amplifier (V2) with negative feed-back has in its feed-back circuit the feed-back resistor (R1) of the first amplifier (V1, Ts1, Ts2) and one or more stepping down resistors (R3, R4) connectable by transistor switches (Ts3, Ts4, Ts5). Series circuit consisting of the above resistors (R1, R3, R4) is inserted between its inputs (22, 23).</p> |
