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Indicating Lamp System for Diagnostic Measurement Disclosure Number: IPCOM000080744D
Original Publication Date: 1974-Feb-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 3 page(s) / 36K

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This arrangement provides a simplified and economical arrangement for the diagnostic testing of voltages in a system.

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Indicating Lamp System for Diagnostic Measurement

This arrangement provides a simplified and economical arrangement for the diagnostic testing of voltages in a system.

The system comprises a plurality of threshold circuits arranged to have a common input. As shown, two threshold circuits are provided designated as LTC for lower threshold circuit and UTC for upper threshold circuit. Each of the threshold circuits is conventional and may be any type of analog-to-digital converter, such as an operational amplifier or the like. Each may be provided with an adjustable resistor AR, for setting the band or range of voltages to which the circuit responds. Each of the circuits has associated therewith an output which provides energy to an indicating lamp, such as the lamps LL and UL for lower level and upper level, respectively.

The threshold circuits will provide an output to light the associated lamp when the voltage at one input of the threshold circuit exceeds the voltage at the other input, by some predetermined amount settable by the resistor AR.

As shown, the first inputs of the two threshold circuits are connected together and to the common terminal of a switch S1, which may be of the rotary type, for example, having three positions. In each of these positions, the inputs to the threshold circuits are connected to a source of voltage, the value of which is to be checked. These input lines are designated as X1, X2 and X3, respectively.

Switches S2 and S3 are ganged together and mechanically operated in synchronism with switch S1, and as can be seen from the drawings, the switch S2 selectively supplies three reference voltages V2, V4 and V6 to the reference input for threshold circuit UTC, while switch S3 performs the same function with respect to reference voltages V1, V3 and V5, supplied to the reference input of threshold circuit LTC.

As an example of the operation of this arrangement, let it be assumed that the volta...