| 摘要 |
A panel meter having an integrated warning light activated by an abnormal operating condition. The meter embodies a conventional electrical meter movement having dial and pointer. The pointer, connected to an armature, is rotatable by the interaction of a magnetic armature with a varying magnetic field generated by varying a sender current in wound coils. Integrated into the meter and on a surface mount printed circuit board between the dial and coils are the components and wiring traces of a dual comparator circuit that activates a light emitting diode signal lamp when a high or low limit operating condition is reached. The signal lamp is fully integrated and mounted on the circuit board and viewable through an aperture in the dial. The same circuit board is usable for high and low limit sensing devices by choosing the position of a resistor located between the comparator collector and the light emitting diode.
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