Sigma BM-286A service manual Theory of Operation

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4. THEORY OF OPERATION page 31

4.2.5. Discriminator Card, RCS-120:

Refer to "RCS-120 Schematic Diagram" Drawing 8 and "RCS-120 Component Designator" Drawing 9 (Appendix F.).

The ±15 volt power supply voltages are regulated to ±12 volts and +5 volts used on this card. The card is lined with test points for measurement of the discriminator levels.

U7 generates the negative 10 volt reference used by the serial digital to analog voltage converters (U1,5,8,10). The converters are selected by the computer through the CIF-553 via U3; a programmable gate array. Serial data and clock are also generated by the CIF differential drivers and U4 receiver decodes this information. Voltage outputs from the converters go to operational amplifiers and transistor drivers to each RCS-110 card by the 44 edge card connector.

4.2.6. Computer Interface Board, CIF-553:

Refer to "CIF-553 Schematic Diagram" Drawing 17 and "CIF-553 Component Designator" Drawing 18 (Appendix F.).

This board is located in the DOS machine. TSA Systems manufactures the CIF-553 board for use in their PC based products. The CIF-553 has the following characteristics:

Twenty-one - 16 bit counters

Three - 8 bit I/O ports

Twenty-four - differential line receivers

Four - differential line transmitters

Two - ribbon connectors (50 & 34 pin)

which interface with the backplane (RCS- 130)

The counters are used for the radiation detectors, motor encoders, etc.

The ports are used for system control and discriminator setting.

Port "C" has 4 differential line drivers and line receivers.

The Address of the card is 1000.

Model BM-286A

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Contents Waste Monitor Model BM-286A Maintenance Table of ContentsInspection and Installation Theory of OperationConfiguration Tracking Sheet Parts TroubleshootingAppendix Warranty Glossary Formulas Recommended Spare Parts Spare Parts Ordering InformationIntroduction Scope and Purpose of ManualSpecifications Introduction Introduction Inspection Installation Operating Instructions General OverviewPOWER-UP and SELF-TESTS Access Menu Level One AccessPCA-II Normal Operation Operating Instructions Programming the System SET-UP Menu AbcdefghOperating Instructions Operating Instructions Waste Stream Parameters Operating Instructions Operating Instructions Operating Instructions This value is used only when the Alarm Type is set to DPM Utilities Menu Operating Instructions Reports Initial Installation Checklist Operating Instructions BM-286A Waste Stream SET-UP Worksheet Unit Operation Theory of Operation Theory of Operation Theory of Operation Theory of Operation Operator Maintenance Maintenance Maintenance LLD Settings for Plastic DetectorsULD Weight Calibration Maintenance Diagnostic Aids Fault Isolation Computers Longs Peak Court LONGMONT, Colorado Appendix B. Glossary Appendix B. Glossary Activity from Counts Reliable Detectable Activity RDA Formula Variance Configuration Tracking Sheet System ModificationsLongs Peak Court LONGMONT,COLORADO Drawings