Fluke Biomedical 945A - Manual (Page 6)

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Table of Contents
Page
FAIL Alarms........................................................................................................................................................ 4-9
Low Signal Failure.............................................................................................................................................................. 4-9
Auto Zero Failure ............................................................................................................................................................. 4-10
High Voltage Failure......................................................................................................................................................... 4-10
Loop Failure ...................................................................................................................................................................... 4-10
Power Failure .................................................................................................................................................................... 4-10
MPU Failure...................................................................................................................................................................... 4-10
P OWER U P P ROCEDURE ..................................................................................................................................... 4-11
H OW TO E NTER S ETPOINTS ............................................................................................................................... 4-11
S ETPOINT D ESCRIPTIONS ................................................................................................................................... 4-12
HIGH Alarm Limit............................................................................................................................................ 4-12
WARN Alarm Limit.......................................................................................................................................... 4-12
Overrange Limit ................................................................................................................................................ 4-12
Underrange Limit .............................................................................................................................................. 4-13
Analog Full Scale ............................................................................................................................................... 4-13
Calibration Factor ............................................................................................................................................. 4-13
Analog Low Scale .............................................................................................................................................. 4-13
S ET P OINT E RROR C ODES .................................................................................................................................. 4-13
A NALOG O UTPUT ................................................................................................................................................. 4-14
V ICTOREEN C OMMUNICATIONS L OOP ............................................................................................................ 4-15
(P REAMPLIFIER S WITCH & J UMPER S ETTINGS ) ........................................................................................... 4-15
D IGITAL R ATEMETER C ONFIGURATION O PTIONS ....................................................................................... 4-16
UDR S WITCH AND T ABLE S ETTINGS ................................................................................................................ 4-16
Jumper Selectable Options ............................................................................................................................... 4-16
UDR Function Switch / Function ..................................................................................................................... 4-17
E RROR C ODES ...................................................................................................................................................... 4-17
P REAMPLIFIER /UDR D IAGNOSTIC LED I NDICATORS .................................................................................. 4-18
977-210 Detector/Preamplifier ......................................................................................................................... 4-18
946A-200 UDR ................................................................................................................................................... 4-18
F UNCTIONAL D ESCRIPTION ............................................................................................................................... 4-19
Detector and Preamplifier ................................................................................................................................ 4-19
Universal Digital Ratemeter (UDR), Model 946A-200................................................................................... 4-23
Main Circuit Board........................................................................................................................................................... 4-23
Microprocessor ............................................................................................................................................................. 4-23
Reset Circuitry.............................................................................................................................................................. 4-28
Clocks ............................................................................................................................................................................ 4-28
NMI Clock..................................................................................................................................................................... 4-28
Write Cycle Clock......................................................................................................................................................... 4-28
Address Drivers ............................................................................................................................................................ 4-28
Data Transceivers ......................................................................................................................................................... 4-29
Control Signal Buffer ................................................................................................................................................... 4-29
Address Decoding ......................................................................................................................................................... 4-29
PROM............................................................................................................................................................................ 4-30
RAM .............................................................................................................................................................................. 4-30
E2 ................................................................................................................................................................................... 4-30
Read - Write Cycles..................................................................................................................................................... 4-31
Write Register Decoding .............................................................................................................................................. 4-31
Counter Control (Write Only) ................................................................................................................................ 4-31
Relay Control Register (Write Only)...................................................................................................................... 4-32
Bargraph (Write Only) ............................................................................................................................................ 4-32
Status Indicators (Write Only)................................................................................................................................ 4-33
Display Control (Write Only).................................................................................................................................. 4-34
Digital to Analog Converter and Output Circuitry (Write Only) ............................................................................ 4-35