Patent ID: 11965920
Assignee: NATIONAL INSTITUTE OF METROLOGY, CHINA
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 2:
3. The method for achieving the comparative measurement of the 4TP impedance bridge as claimed in claim 2, wherein the method comprises:
connecting a high current terminal CH1 of first impedance Z1 to a current output terminal of a first two-stage follower FZ1, and connecting a high voltage terminal PH1 of the first impedance Z1 to a voltage output terminal of the first two-stage follower FZ1; connecting an input terminal of the first two-stage follower FZ1 to a ratio output tap of a ratio induction voltage divider through a switch connection, to thereby make a bridge ratio variable; and connecting a low voltage terminal PL1 of the first impedance Z1 to a high terminal of a Kelvin balance;
connecting a high current terminal CH2 of second impedance Z2 to a current output terminal of a second two-stage follower FZ2, and connecting a high voltage terminal PH2 of the second impedance Z2 to a voltage output terminal of the second two-stage follower FZ2; and connecting a low voltage terminal PL2 of the second impedance Z2 to a low terminal of the Kelvin balance; and
connecting an input terminal of the second two-stage follower FZ2 to the ratio induction voltage divider after connecting the input terminal of the second two-stage follower FZ2 in series with a differential signal injection transformer.