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Reed Relay Variable Time Test

IP.com Disclosure Number: IPCOM000097027D
Original Publication Date: 1962-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Robelen, RJ: AUTHOR [+2]

Abstract

Signals from pulse generator 1 are applied to a number of relays to be tested. A path is through NOR 2, amplifier 3 and driver 4 to operating winding C2. A signal from contacts R2 of the switch is applied to reference amplifier 5, along with a controllable reference signal from reference source 7. The amplifier 5 output is applied to NOR 8 for controlling a fail to close latch 9. NOR 8 receives the output from single shot 10 which is driven by generator 1. NOR 8 also receives the output from latch 12 which is controlled by a fail to open NOR 14. The latter is controlled by signals from single shot 16 driven by generator 1.

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Reed Relay Variable Time Test

Signals from pulse generator 1 are applied to a number of relays to be tested. A path is through NOR 2, amplifier 3 and driver 4 to operating winding C2. A signal from contacts R2 of the switch is applied to reference amplifier 5, along with a controllable reference signal from reference source 7. The amplifier 5 output is applied to NOR 8 for controlling a fail to close latch 9. NOR 8 receives the output from single shot 10 which is driven by generator 1. NOR 8 also receives the output from latch 12 which is controlled by a fail to open NOR
14. The latter is controlled by signals from single shot 16 driven by generator 1.

The single shot 10 pulse determines the sample time for contacts R2 to close. Single shot 16 determines the sample time for the contacts to open. If the contacts fail to close during the pulse from single shot 10, NOR 8 provides a negative error pulse to set latch 9, turn on indicator lamp 17 and cause NOR 19 to open timer switch 18.

NOR 14 provides a similar control for latch 12, indicator lamp 20 and timer switch 21 through NOR 15 for a fail to open situation. This circuit is shown for a normally open contact test. The dotted connections are used for a normally closed contact test. Reset A is activated to start. Reset B is activated to reset counter latch 22.

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