Title:
MEASURING DEVICE FOR INPUT VOLTAGE
Document Type and Number:
Japanese Patent JPS5917166
Kind Code:
A
Abstract:
Circuitry for use in a voltage measurement and display device provides automatic function change for measurement of AC or DC voltages. Voltage measurement in a predetermined mode (DC, for example), is assumed. Upon detection of an input voltage component exceeding a predetermined threshold of the other mode, (AC, or example), the measurement function is changed to that other mode. Upon detection of a component in the other mode, in a range between the predetermined threshold and a second (preferably lower) threshold, an annunciator is activated to alert the user to the presence of the other mode (AC) voltage, for manual activation of a function-selecting switch if desired. Thus, in a specific embodiment, automatic function changeover is provided upon detection of AC components exceeding a predetermined threshold, along with activation of an AC annunciator. Alternatively, in the presence of low magnitude AC ripple voltage components on a DC voltage being measured, the annunciator is activated to attract the operator's attention, with measurement continuing in the DC function.
Inventors:
OOSUCHIN TEII KERII
ARAN ETSUCHI SUTOORUPEN
FUIRITSUPU EMIIRU JIYUNIA
ARAN ETSUCHI SUTOORUPEN
FUIRITSUPU EMIIRU JIYUNIA
Application Number:
JP10907683A
Publication Date:
January 28, 1984
Filing Date:
June 17, 1983
Export Citation:
Assignee:
SANGAMO WESTON
International Classes:
G01R15/09; G01R15/12; (IPC1-7): G01R15/08; G01R15/12
Attorney, Agent or Firm:
Kiyoshi Inomata