Document Outline

• 2620A/2625A Users Manual
  • LIMITED WARRANTY & LIMITATION OF LIABILITY
  • Table of Contents
  • List of Tables
  • List of Figures
  • Safety
    • Caution
    • Interference Information
    • Declaration of the Manufacturer or Importer
    • Bescheinigung des Herstellers/Importeurs
    • Safety Terms in this Manual
    • Symbols Marked on Equipment
    • AC Power Source
    • DC Power Source
    • Use the Proper Fuse
    • Grounding the Instrument
    • Use the Proper Power Cord
    • Do Not Operate in Explosive Atmospheres
    • Do Not Remove Cover
    • Do Not Attempt to Operate if Protection may be Impaired
• Getting Started
  • Introduction
  • The Basics
  • Turning On the Instrument
  • Setting Up a Channel
  • Selecting the Scan Data Destination
  • Taking Measurements
  • Viewing Minimum, Maximum, and Last Data Values
• 1. Introduction
  • The Hydra Series II Data Acquisition Unit
  • The Hydra Series II Data Logger
  • Options and Accessories
    • Applications Software
    • IEEE-488 Interface Assembly
    • Connector Set (2620A-100)
    • Accessories
  • Where to go From Here
• 2. Overview
  • Introduction
  • Setting Up the Instrument
    • Unpacking and Inspecting the Instrument
    • Adjusting the Handle
    • Line Power
    • Front/Rear Panel Features
    • Input Channels
  • Operating Modes
  • Turning the Instrument On
  • Front Panel Display
  • Reading the Display
    • Left Display
    • Right Display
    • Specific Annunciators
  • Front Panel Buttons
    • Selecting a Channel
    • Using the Buttons
  • Setting up a Channel
  • Setting Alarm Limits and Mx+B Scaling Values
    • Alarm Limits
    • Mx+B Scaling
  • Setting the Scan Interval
  • Using the Monitor Function
  • Using the Scan Function
  • Reviewing Channel Data
  • Viewing the Totalizer Count
  • Using External DC Power
  • Using the Rack Mount Kit
• 3. Operating the Instrument from the Front Panel
  • Introduction
  • Operating Modes
  • Other Displayed Data
  • What is the Present Configuration?
    • If Power is Interrupted
    • If the Configuration is Reset
  • Channel Configuration
    • Selecting Channel, Function, and Range
    • Setting Alarms
      • Alarm Limits
      • Alarm Indications
      • Resetting Alarm Conditions
    • Using the Digital I/O Lines
    • Mx+B Scaling
  • Instrument Configuration
    • Entering and Changing Numeric Values
    • Selecting Scan Interval
    • Selecting the Measurement Rate
    • Triggering
    • External Triggering
    • Changing the Temperature Unit
    • Setting Date and Time of Day
  • Measurement Connections
    • DC Volts, AC Volts, Frequency, and Thermocouples
    • Resistance and RTD
  • Totalizing
    • General
    • Connections
  • Review Array
  • List Button Functions
  • Autoprint
  • Memory Storage
  • Front Panel Lock out Conditions
    • Front Panel Review Only Function
    • Front Panel Monitor Only Function
    • Computer Interface-Initiated Lockouts
  • REM Annunciator
  • Calibration
• 4. Using the Computer Interface
  • Introduction
    • Front Panel and Computer Interface Operations
    • Types of Computer Interface
  • Using the RS-232 Computer Interface
    • Setting Communication Parameters (RS-232)
    • Autoprint and Memory Storage (RS-232)
      • Autoprint: Computer Interface Control
      • Autoprint: Output Format
      • Memory Storage: Computer Interface Control
      • Memory Retrieval
      • Memory Full Operation
      • Clearing Memory
    • Cabling the Instrument to a Host or Printer (RS-232)
    • Installation Test
    • RS-232 Information
      • Character Echoing
      • Character Deletion
      • Device Clear Using Ctrl C
      • RS-232 Prompts
    • Sample Program Using the RS-232 Computer Interface
  • Using the IEEE-488 Interface
    • IEEE-488 Operating Limitations
    • Installing the IEEE-488 Interface
    • Enabling the IEEE-488 Interface
    • Installation Test
  • General Information (RS-232 and IEEE-488)
    • How the Instrument Processes Input
      • Input Strings
      • Input Terminators
      • Typical Input Strings
      • Sending Numeric Values to the Instrument (RS-232 and IEEE-488)
      • Sending Input Strings to the Instrument
    • How the Instrument Processes Output
    • Service Requests (IEEE-488 only) and Status Registers
      • Event Status and Event Status Enable Registers
      • Status Byte Register
      • Reading the Status Byte Register
      • Service Request Enable Register
      • Instrument Event Register
  • Computer Interface Command Set
• 5. Additional Considerations
  • Introduction
  • Measurement Rate
  • Advanced Trigger Mechanisms
    • Front Panel Trigger Control
    • Computer Interface Trigger Control
    • Both External and Monitor Alarms Disabled (Type 0)
    • External Trigger Enabled (Type 1)
    • Monitor Alarm Enabled (Type 2)
  • Thermal Voltages
  • When Measuring Resistance or Temperature (RTD)
  • True RMS Measurements
    • Effects of Internal Noise in AC Measurements
    • Waveform Comparison (True RMS vs Average Responding)
  • Making Mixed Measurements
  • Using Shielded Wiring
    • General Rule
    • Alternate Suggestions
      • Non-Isolated Sensor Configuration
      • Isolated and Shielded Sensor Configuration
    • In More Detail
• 6. Maintenance
  • Introduction
  • Cleaning
  • Line Fuse
  • Self-Test Diagnostics and Error Codes
  • Performance Tests
    • Accuracy Verification Test
    • Channel Integrity Test
    • Thermocouple Measurement Range Accuracy Test
    • 4-Terminal Resistance Test
    • Thermocouple Temperature Accuracy Test
    • Open Thermocouple Response Test
    • RTD Temperature Accuracy Test
      • RTD Temperature Accuracy Test (Using Decade Resistance Source)
      • RTD Temperature Accuracy Test (Using DIN/IEC 751)
    • Digital Input/Output Verification Tests
      • Digital Output Test
      • Digital Input Test
      • Totalizer Test
      • Totalizer Sensitivity Test
    • Dedicated Alarm Output Test
    • External Trigger Input Test
  • Calibration
  • Variations in the Display
  • Service
• Appendices
  • A. Specifications
    • Introduction
      • Accuracies at Ambient Temperatures Other Than Specified
      • Response Times
    • DC Voltage Inputs
      • Input Impedance
      • Normal Mode Rejection
      • Common Mode Rejection
      • Maximum Input
      • Cross-Talk Rejection
    • Thermocouple Inputs
      • Input Impedance
      • Common Mode and Normal Mode Rejection
      • Cross-Talk Rejection
      • Open Thermocouple Detect
    • RTD Inputs
      • Type
      • 2-Wire Accuracy
      • Maximum Current Through Sensor
      • Typical Full Scale Voltage
      • Maximum Open Circuit Voltage
      • Maximum Sensor Temperature
      • Cross-talk Rejection
    • AC Voltage Inputs
    • Ohms Inputs
    • Frequency Inputs
    • Typical Scanning Rate
    • Maximum Autoranging Time
    • Totalizing Input
    • Digital Inputs
    • Trigger Input
    • Digital and Alarm Outputs
    • Real-Time Clock and Calendar
    • Environmental
    • General
    • 2625A Data Storage
    • 2620A Options
  • B. ASCII & IEEE-488 Bus Codes
    • Introduction
  • C. IEEE-488.2 Devise Documentation Requirements
    • Introduction
    • Implementation of IEEE Standard 488.2-1987
  • D. Making Mixed Measurements
    • Introduction
    • Signal Cross Talk in a DC Voltage Channel
    • AC Signal Cross Talk Into an AC Voltage Channel
    • AC Signal Cross Talk Into an Ohms Channel
    • AC Signal Cross Talk Into a Frequency Channel
    • AC Signal Crosstalk Into a Temperature Channel
  • E. Binary Upload of Logged Data (LOG_BIN?) (2625A only)
    • Introduction
    • Decoding the ASCII String
    • Floating Point Conversion
    • Example
  • F. RS-232 Cabling
    • Introduction
    • Connections
    • Cables
• Hydra Configuration Record
• Index