公开(公告)号：JP2000097978A

公开(公告)日：2000-04-07

申请号：JP27225998

申请日：1998-09-25

Applicant: TOA ELECTRONICS

Inventor： UENO ATSUO

IPC: G01R27/02

Abstract: PROBLEM TO BE SOLVED: To eliminate a danger of coming-off of a measuring cable during measuring and to improve the operability by providing a means for sensing coming-off of a plug of the cable inserted into measuring terminals of + side and - side from the terminal. SOLUTION: Measuring cables 101, 102 are connected to a sample 200. Measurements are started, and whether the cables 101, 102 are effectively connected to measuring terminals 2, 3 or not is confirmed by a detection switch 4. If the connection is uncertain, an output control switch of a switching circuit 12 is opened with a high voltage controller, an output from a high voltage power source of a voltage circuit 11 is set to 0 V with the controller, and finished. If the connection is certain, the operation is advanced to a measuring operation. If the cables 101, 102 are drawn during the measuring, the switch 4 immediately detects it to turn off the switch of the circuit 12 with the controller, sets an output from the power source of the circuit 11 to 0 V and finished. Thus, even at the time of the coming-off of the cable, a danger is not affected to a measurer.

公开(公告)号：JPH01318974A

公开(公告)日：1989-12-25

申请号：JP15309688

申请日：1988-06-20

Applicant: TOA ELECTRONICS

Inventor： SHIMADA KOICHI ,  UEI SHUNICHI ,  UENO ATSUO

IPC: G01R27/02

Abstract: PURPOSE:To prevent transition current when specimen incorporates a capacitive component and to perform measurement even if the specimen includes a short- circuiting element without trouble, by supplying preparation current under the state wherein ammeters are bypassed in starting measurement. CONSTITUTION:When a capacitive component is included in a specimen X, transition current flows through ammeters I. It takes a long time to attain a balanced state. Therefore, during the preparation period at the beginning of the measurement, a first switch S11 in a resistance measuring circuit I1 and a second switch S21 in a resistance measuring circuit I1 are both turned ON. The current is supplied to the specimen X without through the ammeters I1a and I1b. In this way, a time until a steady state is achieved is shortened. When the specimen is a short-circuiting element, the current through a current limiting circuit IL1 is increased, but a constant voltage element VL1 becomes ON. Since the terminal voltage of a power source is kept at a constant value, measurement can be performed without trouble.