Hydra
Limited Warranty & Limitation of Liability
Interference Information
Page
Safety Summary
Do Not Operate in Explosive Atmospheres
Table of Contents
Hydra
General Maintenance
Performance Testing and Calibration
Diagnostic Testing and Troubleshooting 2635A 5A-1
Schematic Diagrams Hydra Starter Calibration Software
List of Tables
5A-19
List of Figures
5A-10
Introduction and Specifications
Hydra
Operating Instructions
Options and Accessories
Introduction
Theory of Operation 2635A
Conventions
IEEE-488 Option 2620A only Schematic Diagrams
Hydra Features
Model
Specifications
Accessories Description
Common Mode Rejection
A/2625A Specifications
DC Voltage Inputs Resolution Range
Normal Mode Rejection
100.00
Maximum Open Circuit Voltage Maximum Sensor Temperature
A/2625A Specifications Thermocouple Inputs Input Impedance
Common Mode and Normal Mode Rejection
Wire Accuracy
0C to 60C Slow Fast
Maximum Crest Factor
Crest Factor Error Input at Upper Frequency
DC Component Error
Using Channel
Input Protection
A/2625A Specifications Ohms Input Range
Resolution Slow Fast
Typical Full Maximum Current Scale Voltage Through Unknown
Slow Fast
Typical Scanning Rate
Function Range Channels
Trigger Inputs
Totalizing Inputs
Digital Inputs
General
A/2625A Specifications Digital and Alarm Outputs
Real-Time Clock and Calendar
Environmental
2625A Data Storage
RS-232-C
Typical
A/2625A Specifications 2620A Options IEEE-488 Option -05K
AC Signal Crosstalk in a DC Voltage Channel
AC Signal Crosstalk into an AC Voltage Channel
Type Worst case Typical
AC Signal Crosstalk into a Temperature Channel
DC Voltage Inputs Resolution Range Slow Fast
A Specifications
A Specifications Input Impedance
Days Slow Year Slow Year Fast
Introduction and Specifications
A Specifications Thermocouple Inputs Input Impedance
300 mV 10 μV 100 μV 30V 10 mV 150/300V 100 mV
Maximum Crest Factor
A Specifications Ohms Input Range
Typical Scanning Rate Function Range Channels
Totalizing Inputs
A Specifications Digital and Alarm Outputs
TX, RX, DTR, DSR, RTS, CTS, GND
Hydra
Theory of Operation 2620A/2625A
Totalizer Input External Trigger Input Circuits
Introduction
Interconnect Diagram
Theory of Operation 2620A/2625A Functional Block Description
A/D Converter PCA
Detailed Circuit Description
Power Supply Circuit Description
Inverter
Power Fail Detection
Device Selected
Microprocessor Memory Map Hexadecimal Address
Display/Keyboard Interface
Eeprom
Digital I/O
Digital Input Threshold
49. A/D Converter PCA
Input Protection
Simplified
Analog
Analog Measurement Processor Pin Descriptions
Pin Name
Analog Measurement Processor Pin Descriptions Name
Function Relays
A3K15
Function Relay States Relay Position A3K17
A3K16
Input HI
Ohms Simplified Schematic
AC Volts
Overall Gain
AC Volts Input Signal Dividers Range
Drive Signal
A3Z3 Divider Resistors
59. A/D Converter
Inguard Microcontroller Circuitry
Input Connector PCA
Main PCA Connector
Display
Display Controller
Display Initialization Modes
Power-Up Display Initialization
Address Decoding
IEEE-488 Interface Option
Theory of Operation 2635A
2A-49
2A-3. Main PCA Circuitry
2A-4. Power Supply
2A-1. Introduction
2A-2. Functional Block Description
2A-4
Functional Block Description
2A-8. A/D Converter PCA
2A-20. Memory Card Interface PCA
2A-16. Input Connector Assembly
2A-21. Detailed Circuit Description
2A-19. Display PCA
2A-24.Raw DC Supply
2A-23.Power Supply Circuit Description
2A-27.Inverter
2A-31.Digital Kernel
2A-29.Inverter Inguard Supply
2A-33.Microprocessor
1. Microprocessor Interrupt Sources 2635A Pin
Signal Name
2A-34.Address Decoding
2A-35.Flash Eprom
2A-37.Serial Communication Guard Crossing
2A-38.Display/Keyboard Interface
Clock Dividers
2A-40.RS-232 Interface
2A-44.Digital Input Buffers
2A-45.Digital and Alarm Output Drivers
2A-42.Digital I/O
2A-43.Digital Input Threshold
2A-49.Analog Measurement Processor
2A-47.External Trigger Input Circuits
2A-48. A/D Converter PCA
2A-21
2A-22
2A-23
4. Analog Measurement Processor Pin Descriptions 2635A Name
2A-50.Input Protection
5. Function Relay States 2635A Relay Position A3K17
2A-51.Input Signal Conditioning
2A-54.Ohms and RTDs
2A-27
2A-55.AC Volts
6. AC Volts Input Signal Dividers 2635A Range
6. AC Buffer Simplified Schematic 2635A
2A-58.A/D Converter
2A-57.Passive and Active Filters
2A-31
2A-61.Open Thermocouple Check
2A-59.Inguard Microcontroller Circuitry
2A-60.Channel Selection Circuitry
2A-63. Display PCA
2A-62. Input Connector PCA
2A-64.Main PCA Connector
Power Supply A2J1 Pins Nominal Voltage
2A-67.Beeper Drive Circuit
2A-65.Front Panel Switches
2A-66.Display
2A-69.Display Controller
2A-68.Watchdog Timer and Reset Circuit
8. Display Initialization Modes 2635A
2A-70. Memory Card Interface PCA
9. Grid Control Signal Timing 2635A
2A-73.Memory Card Controller
2A-71.Main PCA Connector
2A-72.Microprocessor Interface
2A-74.PCMCIA Memory Card Connector
2A-40
Static awareness
Dow Chemical
General Maintenance
Install the Handle and Mounting Brackets
Required Equipment
Warranty Repairs and Shipping
General Maintenance
Power Requirements
Servicing Surface-Mount Assemblies
Cleaning
Disassembly Procedures
Line Fuse Replacement
Remove the Display PCA
Remove the Front Panel Assembly
Remove the Instrument Case
Remove Handle and Mounting Brackets
Disassembly Procedures
Removing the Handle and Handle Mounting Brackets
A and 2625A Assembly Details
A Assembly Details
Remove the Memory Card I/F PCA 2635A Only
Remove the IEEE-488 Option 2620A Only
Remove the Memory PCA 2625A Only
Remove the A/D Converter PCA
Remove the Main PCA
Disconnect Miscellaneous Chassis Components
Assembly Procedures
Install Miscellaneous Chassis Components
Install the A/D Converter PCA
Install the Memory PCA 2625A Only
Install the Main PCA
Install the IEEE-488 Option 2620A Only
Install the Handle and Mounting Brackets
Install the Memory Card I/F PCA 2635A Only
Assemble the Front Panel Assembly
Install the Front Panel Assembly
Hydra
Performance Testing and Calibration
Hydra
Recommended Model
Recommended Test Equipment Minimum Specifications
Introduction Required Equipment
Instrument Type
Channel Integrity Test
Performance Tests
Accuracy Verification Test
Year, 18-28C
Performance Tests Voltage, Resistance, and Frequency
Function Range Input Level
Thermocouple Measurement Range Accuracy Test
Func 0,VDC,I100MV CR MON 1,0 CR MONVAL? CR
Terminal Resistance Test
Input Module
Thermocouple Temperature Accuracy Test
11 12 13 14 15 16 17 18 19 3 4 5 6 7 8 9
11 12 13 14 15 16 17 18 19
Usable Range
Thermocouple Information Type Positive Lead Material
Positive Lead Color
Negative Lead Material
Open Thermocouple Response Test
RTD Temperature Accuracy Test
Temperature Accuracy Specifications Year @ 18-28C
RTD Temperature Accuracy Test Using DIN/IEC
Simulated C Temperature 2620A/2635A
Digital Output Test
Digital Input/Output Verification Tests
Digital Input Values State of Digital Inputs
Digital Input Test
Totalizer Test
Terminal Grounded
Totalizer Sensitivity Test
Dedicated Alarm Output Test
5700A
2 3 4 5 6 7 Σ + 0 1 2 3 TR
External Trigger Input Test
Calibration
Performance Testing and Calibration
Calibration Mode Computer Interface Commands Description
Using Hydra Starter Calibration Software
Setup Procedure Using Starter
Command
Calibration Procedure Using Starter
Calibration Procedure Using a Terminal
Using a Terminal
Setup Procedure Using a Terminal
DC Volts Calibration Action
Response
10. AC Volts Calibration Action
Reference Junction Calibration
Terminal Connections to Decade Resistance Source
Concluding Calibration
Hydra Input Module
Updating 2635A Data Bucket Embedded Instrument Firmware
11 -Wire Ohms Calibration Fixed Resistor Command
12 -Wire Ohms Calibration 5700A Command
Using the PC Compatible Firmware Loader Software
13. Frequency Calibration Command
Setup Procedure for Firmware Download
Default Instrument Firmware Download Procedure
Using LD2635 Firmware Loader Directly
Diagnostic Testing and Troubleshooting 2620A/2625A
Failure to Detect Memory PCA Failure to Store Data
Servicing Surface-Mount Assemblies
Each error code is displayed for 2 seconds
Error Codes
Error Error Codes Description
Preregulated Power Supplies
General Troubleshooting Procedures
Test Point Locator, Main PCA A1
Raw DC Supply
Power Supply Troubleshooting
Power Fail Detection
Volt Switching Supply
Inverter
Volt Switching Supply
Hydra
FET Gate Signal
Power Supply Test Location Acceptable Range
Analog Troubleshooting
Fault
Power Supply Troubleshooting Guide Symptom
Test Point Pulses
Test Points, A/D Converter PCA A3, A3U9
Microcontroller
A3U9
Signal Description
DC Volts Troubleshooting
AC Volts Troubleshooting
DC Volts HI Troubleshooting Checkpoint
Ohms Open-Circuit Voltage Range
Ohms Troubleshooting
AC Volts HI Troubleshooting Checkpoint
Ohms HI Troubleshooting Checkpoint
Digital Kernel Troubleshooting
Microprocessor Timing
Totalizer Troubleshooting
Digital and Alarm Output Troubleshooting
Digital Input Troubleshooting
Test Points, Display PCA A2
Display Assembly Troubleshooting
Review
Variations in the Display
Calibration-Related Components
Calibration Failures
Introduction
Ohms
AC Volts 1 kHz
Replacing the Eeprom A1U1
Retrieving Calibration Constants
Failure to Detect Memory PCA
IEEE-488 Interface PCA A5 Troubleshooting
Memory PCA A6 Troubleshooting
Power-Up Problems
Hydra
Diagnostic Testing and Troubleshooting 2635A
Failure to Detect Insertion of Memory Card
5A-2. Servicing Surface-Mount Assemblies
5A-1. Introduction
5A-3. Error Codes
1. Error Codes 2635A Description
Error
Measurement Points
5A-4. General Troubleshooting Procedures
1. Error Codes 2635A
2. Preregulated Power Supplies 2635A Preregulated Voltage
General Troubleshooting Procedures
5A-6. Raw DC Supply
5A-5. Power Supply Troubleshooting
5A-7. Power Fail Detection
5A-8 -Volt Switching Supply
5A-9. Inverter
2 -Volt Switching Supply 2635A
5A-10
5A-10. Analog Troubleshooting
3. Power Supply Troubleshooting Guide 2635A Symptom
Power Supply Nearest Component Acceptable Range
5A-14
5A-15
6. Integrator Output 2635A
5A-11. DC Volts Troubleshooting
5. AC Volts HI Troubleshooting 2635A Checkpoint
5A-12. AC Volts Troubleshooting
5A-13. Ohms Troubleshooting
4. DC Volts HI Troubleshooting 2635A Checkpoint
6. Ohms Open-Circuit Voltage 2635A Range
5A-14. Digital Kernel Troubleshooting
Voltage 7. Ohms HI Troubleshooting 2635A Checkpoint
Output A12 A11 A10
5A-20
5A-16. Digital Input Troubleshooting
5A-15. Digital and Alarm Output Troubleshooting
5A-22
5A-18. Display Assembly Troubleshooting
5A-17. Totalizer Troubleshooting
5A-24
10. Display Test Pattern #1 2635A
9. Display Controller to Microprocessor Signals 2635A
5A-19. Variations in the Display
5A-22. Calibration-Related Components
5A-20. Calibration Failures
5A-21. Introduction
5A-28
5A-24. Replacing the Flash Memory A1U14 and A1U16
5A-23. Retrieving Calibration Constants
5A-27. Failure to Detect Memory Card I/F PCA
5A-25. Memory Card I/F PCA A6 Troubleshooting
5A-26. Power-Up Problems
5A-28. Failure to Detect Insertion of Memory Card
5A-29. Failure to Power Card / Illuminate the Busy Led
5A-30. Failure to Illuminate the Battery Led
Battery LED
5A-32. Write/Read Memory Card Test Destructive
5A-31. Failure to Write to Memory Card
Memory card test passed without detecting any errors
5A-34
List of Replaceable Parts
Hydra
Manual Status Information
How to Obtain Parts
Revision
Service Centers
Newer Instruments
A/2625A Final Assembly
List of Replaceable Parts Service Centers
TM1 TM2 TM3 TM4 TM5 TM6
2620A/2625A T&B
Bottom View
Top View
S58f.eps
A Final Assembly
TM1 TM2 TM3 TM4 TM5
2635A T&B
Part of W2 MP102 H52 Cable Assembly
T1 Ref H52
S62f.eps
CR5,CR6
A/2625A A1 Main PCA
Reference Description Designator
VR1 VR2 VR3 VR4
2620A-1601
CAP,AL,10UF,+-20%,63V,SOLV Prooof
A A1 Main PCA
MP101 Q1-3,Q10 Q4-6 Q7,Q8 R1,R11,R12 R22,R25,R45
INDUCTOR,FXD,DUAL,EE24-25,0.4MH,1.2A
2635A-1601
A2 Display PCA
WIRE,JUMPER,TEF,22AWG,WHT,.300
CKT
Reference Description Designator Fluke Stock Tot Qty
A3 A/D Converter PCA
Reference Description Fluke Stock Designator
K3, K5-K14 Relay Polarity
Reference Description Fluke Stock Tot Qty Designator
A4 Analog Input PCA
2620A-1604
A5 Option -05 IEEE-488 Interface PCA
A5 IEEE-488 Interface PCA Option
A A6 Memory PCA
2625A-1606
10 a A6 Memory Card I/F PCA
2635A-1606
Hydra
IEEE-488 Option
Hydra
Functional Block Description
Theory of Operation
IEEE-488 PCA Detailed Circuit Description 2620A Only
IEEE-488 Controller
Main PCA Connector
IEEE-488 Transceiver Control
IEEE-488 Transceivers/Connector
Removing the IEEE-488 Option
Installation
Installing the IEEE-488 Option
Performance Testing
Failure to Handshake on IEEE-488 Bus
Troubleshooting
Communication Problems
Failure to Select IEEE-488 Option
List of Replaceable Parts
Schematic Diagram
Hydra
Schematic Diagrams
Hydra
Schematic Diagrams
Power Supply PIN Numbers DES
RAW Supply
2620A-1001
U S E D
A1 Main PCA 2635A
Reference Designations Lasted Used Not Used
2635A-1001
2635A-1001
2635A-1001
Control
External Trigger Totalizer Inputs
CKT
2620A-1002
S91c.eps
2620A-1003
S82c.eps
S83c.eps
S92f.eps
2620A-1004
A5 IEEE-488 Interface PCA 2620A Only
1V dc
A6 Memory PCA 2625A
A6U1 A6U2 A6U3 A6U4 A6U5 A6U6 A6U7 A6U8 2625A-1006
Lasted Used Not Used 0V dc
Reference Designations
2635A-1006
Schematic Diagrams