Clamp-on multimeter having a display for indicating the results of a plurality of measurements

• US 5,349,289 A
• Filed: 09/09/1992
• Issued: 09/20/1994
• Est. Priority Date: 04/27/1992
• Status: Expired due to Term

• Current Assignee: Kaise Kabushiki Kaisha
• Original Assignee: Kaise Kabushiki Kaisha
• Inventors: Shirai, Etsuo
• Primary Examiner(s): NGUYEN, VINH P
• Application Number:
  US07/942,545
• Time in Patent Office: 741 Days
• Field of Search: 324/127, 324/115, 324/114, 324/116, 324/129, 324/149, 324/378, 324/429, 324/426, 324/143, 364/483, 364/481, 340/660
• US Class Current: 324/127
• CPC Class Codes: G01R 1/22 Tong testers acting as secondary windings of current transformers
• CPC Class Codes: G01R 13/02 for displaying measured electric variables in digital form
• CPC Class Codes: G01R 15/12 Circuits for multi-testers , i.e. multimeters, e.g. for measuring voltage, current, or impedance at will
• CPC Class Codes: G01R 19/25 using digital measurement techniques

Abstract

A clamp-on multimeter includes a body section, and a clamp section having a pair of clamp cores for clamping a conductor to be measured. The front ends of the clamp cores are capable of closing and opening. An input section receives signals introduced from a conductor. A display section simultaneously displays a first parameter corresponding to an induction voltage induced in the clamp section, and a second parameter corresponding to the measured signals input via the input section. A control section controls the simultaneously display of the first parameter and the second parameter on the display section.

Claims

1. A clamp-on multimeter, comprising:

a body section accommodating electric circuits;

a clamp section having a pair of arcuate clamp cores on said body section, for clamping a conductor to be measured, said clamp cores being made of a magnetizable material, said clamp cores having front ends capable of being closed and opened with respect to one another;

an input section for receiving signals to be measured from a conductor, said input section being in said body section;

a display section in said body section, said display section comprising means for simultaneously displaying a first parameter corresponding to an induction voltage induced in said clamp section, and a second parameter corresponding to measured signals input via said input section; and

a control section measuring said induction voltage in said clamp section and the measured signals input via said input section and, in response thereto, simultaneously providing the first parameter and the second parameter to said display section.

2. The clamp-on multimeter according to claim 1, wherein the first parameter is DC-current, AC-current or frequency, and the second parameter is DC-voltage, AC-voltage, frequency, resistance or temperature.

3. The clamp-on multimeter according to claim 2, further comprising a selecting section for selecting the first parameter and the second parameter.

4. The clamp-on multimeter according to claim 1, wherein said control section comprises means for measuring maximum value or minimum value of the first parameter and the second parameter, and providing the maximum value or the minimum value to said display section.

5. The clamp-on multimeter according to claim 4, wherein the first parameter is DC-current, AC-current or frequency, and the second parameter is DC-voltage, AC-voltage, frequency, resistance or temperature.

6. The clamp-on multimeter according to claim 5, further comprising a selecting section for selecting the first parameter and the second parameter.

7. The clamp-on multimeter according to claim 1, wherein said control section comprises means for measuring maximum value and minimum value of the first parameter and the second parameter, and providing the maximum value and the minimum value to said display section.

8. The clamp-on multimeter according to claim 7, wherein the first parameter is DC-current, AC-current or frequency, and the second parameter is DC-voltage, AC-voltage, frequency, resistance or temperature.

9. The clamp-on multimeter according to claim 8, further comprising a selecting section for selecting the first parameter and the second parameter.

10. The clamp-on multimeter according to claim 9, wherein the first parameter is DC-current and the second parameter is DC-voltage.

11. The clamp-on multimeter according to claim 10, further comprising a selecting section for selecting the first parameter and the second parameter.

12. The clamp-on multimeter according to claim 11, wherein the first parameter is AC-current and the second parameter is AC-voltage.

13. The clamp-on multimeter according to claim 12, further comprising a selecting section for selecting the first parameter and the second parameter.