Browse Prior Art Database

Diagnostic Testing of Probe Cable

IP.com Disclosure Number: IPCOM000061294D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Ballou, R: AUTHOR [+7]

Abstract

This article describes a technique to quickly and accurately test a probe cable and its supporting electronics. A probe cable is used to connect a diagnostic technician terminal to electrical/electronic components on a vehicle during the fault-isolation phase of a vehicle service procedure. When the probe has been connected, the terminal performs an exhaustive "black box" analysis of the connected component. If the probe cable has been damaged or the circuits in the terminal are faulty, erroneous readings from or commands to the component can lead to an incorrect repair action. Referring to the block diagram of the drawing, a connector is provided in the terminal into which the probe cable head is "parked" when not in use or whenever the technician wants to verify it.

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Diagnostic Testing of Probe Cable

This article describes a technique to quickly and accurately test a probe cable and its supporting electronics. A probe cable is used to connect a diagnostic technician terminal to electrical/electronic components on a vehicle during the fault-isolation phase of a vehicle service procedure. When the probe has been connected, the terminal performs an exhaustive "black box" analysis of the connected component. If the probe cable has been damaged or the circuits in the terminal are faulty, erroneous readings from or commands to the component can lead to an incorrect repair action. Referring to the block diagram of the drawing, a connector is provided in the terminal into which the probe cable head is "parked" when not in use or whenever the technician wants to verify it. The insertion of the cable causes an interrupt to a micro-controller to indicate the requirements for a probe-validation test. Test signals are outputted through the cable 1 and read back from the park connector 2, through the program controlled cross-point switch 3, to data register 4 and to the micro controller 5, for validation. It will also switch in dummy loads 6 to test for valid resistance and voltage readings. All the test capabilities of the probe and its circuits are checked in this "wrapped" state. To insure that the cable is good before another vehicle is serviced, the cable must have been plugged into the terminal at the end of the prior service and tes...