VOLTAGE INDICATOR Russian patent published in 2003 - IPC

FIELD: measurement technology. SUBSTANCE: proposed voltage indicator combines functions of single and double-pole voltage indicators and structurally includes two cases fitted with contact probes connected to input terminals of voltage indicator through current-limiting resistors. First case houses unit testing presence of direct voltage, power supply source, unit testing presence of levels of alternating voltage and three light indicators of visual control of existence of voltages connected to terminals. Novelty of design consists in that first case houses additional unit testing existence of phase and zero wires and audio signaling unit. Unit testing existence of phase and zero wires incorporates voltage-to-current converter which input is connected through first terminal to first contact probe and light indicator PHASE and third terminal contacting operator's hand is connected to output of voltage-to-current converter. Audio signaling unit comes in the form of sound pulse generator fitted with acoustic element and pulse converter which input is connected to unit controlling converter. One input of it is connected to first contact probe-lug through first input terminal, second input of it is connected to power supply source. Unit testing presence of levels of alternating voltage comes in the form of comparator unit comprising several comparators, possessing one input connected to second remote probe through voltage divider and second terminal and four outputs. Three light indicators of visual control of existence of levels of voltage and additional indicator controlling integrity of circuit are connected to each output. Two additional light indicators used as visual indicators of existence of direct or alternating voltage which functions as indicator of voltage polarity in wires in presence of direct voltage are placed between first terminal and voltage divider. EFFECT: expanded operation field thanks to integration of functional capabilities of elements of voltage indicator. 1 dwg