Block Diagram of ECS Test | Fluke 875 specs

Victoreen 875

Operators Manual

high voltage ramp. The overall circuit that monitors the ECS test also includes U2, described with the power supplies; and the SAFE/FAIL circuit on the relay driver printed circuit board.

Ultimately, by the action of R218, the charge integration adjustment potentiometer (CHARGE INTEG. ADJ.), charging capacitor C209, and other auxiliary elements, a DC voltage is produced on terminal 10 of U201, and an output voltage on pin 8 which results in an input to pin 10 of U208 which will be approximately zero if the system is operative, and approximately + 15 V it a malfunction is present, or on channel power-up before the first automatic or manually initiated ECS test.

This signal is the input to the latch-and-flop circuit composed of the NOR circuits U202 (pins 1 to 13). The latch is quiescent until triggered near the end of the ECS test period by the latch-enable input on pin 1 of U202. This trigger voltage will cause the output (pin 10 of U202) to flop from a pass indication to a fail indication if a malfunction exists in the detector cable, or signal input circuit.

If the system is operative, a voltage that is low (6.2 V) will appear at terminal 8; if the system has a malfunction, a voltage that is high (+15 V) will appear at this terminal (+15 V will appear momentarily immediately after power on). This voltage determines the action of a comparison circuit U4A, and the output of U4A determines the action of the SAFE/FAIL circuit.

A block diagram of the entire monitoring circuit of the ECS test is shown in Figure 4-1.

Figure 4-1.Block Diagram of ECS Test

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Fluke 875 manual Block Diagram of ECS Test

Contents

Victoreen High Range Containment Monitor Fluke Biomedical Table of Contents Calibration and Test Procedures Specifications IntroductionGeneral Description Containment Monitor Temperature Operating 40 to 120F 4 to 49C Readout Module 876A-1 High-Range Containment Monitor Detector Equipment OverviewRack Chassis Pull Box Assembly Cables/Connectors/PanelFlexible Tubing 878-12-30TAB Optional Equipment High-Range Containment Monitor Typical Energy Response Curve Detector Typical Linearity Detector High-Range Detector, Recommended Installation Receiving Inspection Procedures, Warnings, and Cautions Storage Blank Installation InstallationReadout Module Pull Box Specifications for Cable Cable Sealing Cable and Wiring Installation Detector Test After InstallationSpecifications for Cable Detector Cable Inside Containment Ancillary Wiring All Alarms on P2 Normal Operation Shelf StatePower Connections P1 Computer & Recorder Operation Operation Victoreen Functional Description Function DescriptionReadout Module 876A-1 Negative Power Supply FAIL/SAFE Comparison Circuit on Power Supply Board High Voltage Power Supply Normal Operation non-ECS TestOperation of High Voltage Supply During ECS Test High Alarm Circuit Alert Alarm Circuit Recorders and Computer Buffers Fail/Safe CircuitPen Clamp Panel Meter Action During ECS Test Meter at extreme lower end of scale Low Voltage Ramp Generator Action of Green Safe/Reset Light and Alarm During ECS TestMonitoring Circuits of The ECS Board Block Diagram of ECS Test Safe/Reset Sub-circuits Muting Circuits of ECS Board Blank Maintenance Maintenance, Calibration, and TroubleshootingCalibration Test Procedure TP876A-1-108 Troubleshooting Signal Input Circuit Mother Board P/N 876-1-78, Schematic 876-1-3APreamplifierIMeter Board P/N 876A-1-86, Schematic 876A-1-3E Rear Panel TP501 TP502 +6.3 Test Point Normal Channel Test Muting Stages of the Alarm Circuits High Alarm CircuitNormal Low Signal Level Channel Test ESC Board P/N 876A-1-92, Schematic 876A-1-3D Wave Shapes on the Electronic Check Source Board Overall Fail Circuitry Associated with the ECS Test Starting With Pins M and P on the Power Supply SchematicStarting With Terminal H on Relay Driver Board Outputs of U206 Pulse Generator on the ECS Board Operation of the Latch Circuit Latch Circuit Circuit assumed initially in Pass Condition Fail Condition NOR Pin Voltage State Comments Calibration and Test Procedures Blank Cable and Pull Box Procedures Cable and Pull Box Procedures Victoreen Applicable Drawings Applicable Drawings and Bill of MaterialsDocument Number Description Detector Cable Out of Containment Applicable Bill of Materials Fluke Biomedical