Recorder with circuit line tamper indicating system
First Claim
1. A transportation equipment recording system for recording operating parameter information of the equipment on a recording medium, being characterized by at least one sensing means for sensing occurences of circuit line impedance changes representative of unauthorized inoperative periods within said recording system and recording means responsive to said sensing means for visually recording such occurences on the recording medium.
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Accused Products
Abstract
The present invention provides a recording system for recording operating parameter information on transportation equipment, such as large trucks and the like. The recording system includes at least one circuit line for operation thereof and is characterized by a sensor for sensing circuit line impedence changes indicative of unauthorized shut down of the system, as well as a recording member responsive to the sensor for visually recording any occurrences of these impedence changes on the recording medium.
19 Citations
10 Claims
- 1. A transportation equipment recording system for recording operating parameter information of the equipment on a recording medium, being characterized by at least one sensing means for sensing occurences of circuit line impedance changes representative of unauthorized inoperative periods within said recording system and recording means responsive to said sensing means for visually recording such occurences on the recording medium.
Specification