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Diagnostic Probe

IP.com Disclosure Number: IPCOM000091181D
Original Publication Date: 1969-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Edgington, GE: AUTHOR [+5]

Abstract

The probe indicates a downlevel of voltage applied to input 10 by causing lamp 11 to be lit and indicates an uplevel of voltage applied to input 10 by causing lamp 12 to be lit.

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Diagnostic Probe

The probe indicates a downlevel of voltage applied to input 10 by causing lamp 11 to be lit and indicates an uplevel of voltage applied to input 10 by causing lamp 12 to be lit.

The voltage on input 10 is applied to input buffer 13 whose output is applied to the set side of latch 14. This is so adjusted that, at a downlevel of -2.25 to - 1.55 volts applied on input 10, it causes lamp 11 to be lit by converter and lamp driver 15. The signal on input 10 may be only 20 to 30 nanoseconds. Delay 16 resets latch 14 causing lamp 11 to be darkened after a delay of 100 milliseconds.

Input buffer 13 has its output connected through inverter 17 with the set side of latch 18. This is so adjusted so as to be set when the voltage applied to input 10 is at an uplevel of -0.965 to -0.55 volts. Latch 18, by converter and lamp driver 19, causes lamp 12 to be lit under these conditions. Delay 20 connected to the reset side of latch 18 assures that lamp 12 remains lighted for 100 milliseconds.

Inhibit circuit 21, connected to driver 15, inhibits such driver from functioning to light lamp 11 if the voltage applied to input 10 is below -4 volts. Inhibit circuit 22, connected between input 10 and driver 19, inhibits the functioning of driver 19 to light lamp 12 if the voltage applied to input 10 is above zero. Clamp protection circuits 23 and 24 limit the negative and positive voltages that can exist on input 10.

Buffer inverter circuit 25 is connected through Or 26 wi...