| 摘要 |
<p>The circuit contains a series circuit of two or more reference resistance units (R1,R2) and at least one measurement resistance (Rx). Each resistance is connected via a conductor pair to an analogue multiplexer (13) which is regulated by a control and evaluation circuit (17). The conductor pair (46,47) connected to the measurement resistance is also connected to a capacitor (19), to charge the capacitor to the voltage appearing across the resistance. The capacitor is then discharged by a circuit containing a discharge resistance (RE) and a digital time measurement circuit (41,43) which measures and stores the discharge time for evaluation. The measurement resistance value is computed from the three discharge times.</p> |
