2620A/2625A
 Limited Warranty & Limitation of Liability
 Table of Contents
 2620A/2625A
Operating the Instrument from the Front Panel
 Additional Considerations
 Index
 List of Tables
 Performance Tests Voltage, Resistance, and Frequency
 List of Figures
 Interference Information
 Safety Terms in this Manual
Symbols Marked on Equipment
 2620A/2625A AC Power Source
DC Power Source
Use the Proper Power Cord
Use the Proper Fuse
 Setting Up a Channel
Getting Started
Introduction
Basics
 Selecting the Scan Data Destination
 Taking Measurements
 Viewing Minimum, Maximum, and Last Data Values
 Last MIN MAX
 Xvi
 Introduction
 2620A, 2625A
 Hydra Series II Data Logger
Options and Accessories
Hydra Series II Data Acquisition Unit
 Hydra Features
 Where to go From Here
Accessories
Accessories Description
Model
 Using the Computer Interface
Maintenance
Getting Started
Introduction
 Overview
 2620A, 2625A
 Setting Up the Instrument
Adjusting the Handle
Introduction
Unpacking and Inspecting the Instrument
 Line Power
Front/Rear Panel Features
 Active Mode Buttons
Power Button PRINT/COMMUNICATIONS Buttons
Instrument Configuration Buttons
Channel Configuration Buttons
 Auto MON
REM Scan SET
 Display Annunciators
Func Alarm OFF Auto Limit
MON Scan SET
 HI, LO Review MIN, MAX Last PRN
EXT REM CAL
 Input Channels
Operating Modes
Turning the Instrument On
 Front Panel Display
Reading the Display
Left Display
Right Display
 Using the Buttons
Front Panel Buttons
Selecting a Channel
Front Panel Pushbuttons
 Setting up a Channel
 Setting up a Channel
 Setting Alarm Limits and Mx+B Scaling Values
Alarm Limits
 Setting the Scan Interval
Mx+B Scaling
 Reviewing Channel Data
Using the Monitor Function
Using the Scan Function
 Using External DC Power
Viewing the Totalizer Count
Activate
Review Array Review Points
 Using the Rack Mount Kit
 Operating the Instrument from the Front Panel
Entering and Changing Numeric Values
 2620A, 2625A
 Configuration Mode
 Other Displayed Data
What is the Present Configuration?
Channel Configuration
 Digital I/O Line Assigned to Channels
Configuration Reset Settings
Power on
 DC Voltage, AC Voltage Function Range
Press These Buttons OFF
Select
From
 Resistance
Frequency
 Press Buttons OFF Select
 RTD Temperature Type Terminals
Setting Alarms
Alarm Limits
 Alarm Indications
Alarm Selection ChannelAlarm
 Resetting Alarm Conditions
Using the Digital I/O Lines
 Initial Alarm Assignments, Digital I/O Lines 4 Through
To define the scaling values
Page
 Instrument Configuration
Entering and Changing Numeric Values
Press These Buttons To Select
Sign, M Decimal Multiplier Value Point Position
 Selecting Scan Interval
Selecting the Measurement Rate
Hour
10. Scan Interval Minute
 Changing the Temperature Unit
Triggering
External Triggering
11. Measurement Rate Selection
 Setting Date and Time of Day
Measurement Connections
Date/Time Selection Year Month.Day Hour.Minut
Mn.dY Hr.nn
 DC Volts, AC Volts, Frequency, and Thermocouples
 Strain Relief
Input Module Connections
 Resistance and RTD
14. Thermocouple Ranges Positive Lead Type Material
Positive Lead Color
Negative Lead Material
 11 12 13 14 15 16 17 18 19
11 12 13 14 15 16 17 18 19 3 4 5 6 7 8 9
 Totalizing
Review Array
General
Connections
 List Button Functions
Activate Note 15. Review Array Review Points
 16. List Button Operation
 Autoprint
Memory Storage
 Front Panel Monitor Only Function
Front Panel Lock out Conditions
Front Panel Review Only Function
 Computer Interface-Initiated Lockouts
REM Annunciator
Calibration
 2620A, 2625A
 Using the Computer Interface
 Computer Interface Command Set
 Types of Computer Interface
Using the RS-232 Computer Interface
Front Panel and Computer Interface Operations
 Parity = No
Setting Communication Parameters RS-232
Parity = E or Odd
 Autoprint Output Format
Autoprint and Memory Storage RS-232
Autoprint Computer Interface Control
 Memory Storage Computer Interface Control
Memory Retrieval
 Cabling the Instrument to a Host or Printer RS-232
Memory Full Operation
Clearing Memory
 Installation Test
Device Clear Using Ctrl C
RS-232 Information
Character Echoing
 Using the IEEE-488 Interface
Sample Program Using the RS-232 Computer Interface
Installing the IEEE-488 Interface
RS-232 Prompts
 Sample Program
 Gosub
 IEEE-488 Setup BaudAddress
Enabling the IEEE-488 Interface
Capability
IEEE-488.1 Capabilities Description
 General Information RS-232 and IEEE-488
How the Instrument Processes Input
 Typical Input Strings
Input Strings
Input Terminators
 Intvl 0, 10, 0 Scan 1 LAST?
Func 1, OHMS, 3
Func 1, TEMP, PT, 2 RTDR0 12
 Sending Input Strings to the Instrument
How the Instrument Processes Output
 Service Requests IEEE-488 only and Status Registers
 ESB
 Event Status and Event Status Enable Registers
Status Byte Register
Bit Name
Status Byte Register Description
 Reading the Status Byte Register
Event Status Register Description
 Service Request Enable Register
Instrument Event Register
 Computer Interface Command Set
Instrument Event Register IER
 Command and Query Summary
 Lock
LOCK?
Rate
RATE?
 Tempconfig TEMPCONFIG?
Format FORMAT?
Reviewclr
Intvl INTVL? Scan SCAN? SCANTIME?
 Field Description
Command and Query Reference
ESE? ESR? IDN? OPC OPC? RST
 Computer Interface Command Set
SRE? STB? TRG TST?
 ALARMS?
 Limit ALARMASSOC? channel,limitnum Channel
 LO OFF
Date
 Dolevel Echo Format
 FORMAT? Func Measurement Units String
VDC
VAC
Ohms
 FUNC? IEE
TEMP, VAC, VDC, OHMS, FREQ, OFF
 IEE? IER? Intvl INTVL? LAST?
 Lock LOCK? Locs LOG?
 LOGGED? LOGBIN? Logclr LOGCOUNT?
 Logmode LOGMODE? Lwls MAX?
 MON MONCHAN? MONVAL?
 Print PRINT? Printtype
Store Scans
 Rate RATE?
 RTDR0 RTDR0?
 Code Display MAX Offset Value
 Scan SCAN? SCANTIME? Tempconfig
 TEMPCONFIG? Time TIMEDATE?
 Total TOTAL? Totaldbnc TOTALDBNC? Trigger
 Returns an integer representing the present trigger type
 Additional Considerations
 2620A, 2625A
 Measurement Rate
Advanced Trigger Mechanisms
Front Panel Trigger Control
Computer Interface Trigger Control
 Both External and Monitor Alarms Disabled Type
External Trigger Enabled Type
 High Valid External Triggers Scan Time
LOW Ignored Scan Falling Progress Edge
 Thermal Voltages
When Measuring Resistance or Temperature RTD
Monitor Alarm Enabled Type
 When Measuring Resistance or Temperature Rtd
 True RMS Measurements
Effects of Internal Noise in AC Measurements
Waveform Comparison True RMS vs Average Responding
Ohms Test Voltage Range
 Making Mixed Measurements
 Comparison of Common Waveforms
 Using Shielded Wiring
Non-Isolated Sensor Configuration
Isolated and Shielded Sensor Configuration
General Rule
 More Detail
 Maintenance
Thermocouple Measurement Range Accuracy Test
 2620A, 2625A
 Line Fuse
Introduction Cleaning
Self-Test Diagnostics and Error Codes
 Performance Tests
Replacing the Line Fuse
 Error Power-Up Error Codes Description
Performance Tests
 Recommended Test Equipment Minimum Specification
Instrument Type
Recommended Model
Instrument Type Recommended Model
 Accuracy Verification Test
Channel Integrity Test
 MIN MAX
 Thermocouple Measurement Range Accuracy Test
Performance Tests Voltage, Resistance, and Frequency
 Func 0,VDC,I100MV CR MON 1,0 CR MONVAL? CR
Terminal Resistance Test
 Thermocouple Temperature Accuracy Test
 Wire
5700A
OFF Comp
Sense Source
 Open Thermocouple Response Test
Decade Resistance BOX Hydra Input Module
 RTD Temperature Accuracy Test
Year @ 18-28C
 Year @ 18-28 Degrees C
RTD Temperature Accuracy Test Using DIN/IEC
Digital Input/Output Verification Tests
 Digital Output Test
Digital Input Test
 Totalizer Test
Digital Input Values
 Dolevel 0,0 CR Dolevel 0,1 CR
Totalizer Sensitivity Test
 Dedicated Alarm Output Test
 Dedicated Alarms Output Test
2 3 4 5 6 7 Σ + 0 1 2 3 TR
 External Trigger Input Test
2 3 4 5 6 7 Σ
 Service
Variations in the Display
 Appendices
Appendix Title
Page
 Response Times
Specifications
Accuracies at Ambient Temperatures Other Than Specified
 DC Voltage Inputs
 Thermocouple Inputs
Year Slow Year Fast
 2620A/2625A
 Common Mode and Normal Mode Rejection
RTD Inputs
Open Thermocouple Detect
Type
 Wire Accuracy
Range Resolution Slow Fast
AC Voltage Inputs
IEC 751, Amendment 2, 100 e Platinum ITS-90
 Range Frequency Year Accuracy ±% ± 18C to 28C 0C to 60C
Slow Fast
 Crest Factor Error
DC Component Error
Maximum Crest Factor
Maximum AC Input
 Maximum Current Through Unknown
Ohms Inputs
Input Protection
 Range Resolution Accuracy + % ± Hz Slow Fast
Frequency Inputs
Frequency Range
Sensitivity
 VDC Temperature VAC Ohms Frequency
Typical Scanning Rate
Auto PT RTD
Auto
 Digital Inputs
Maximum Autoranging Time
Totalizing Input
 Trigger Input
Input Voltages
Minimum Pulse Width Maximum Frequency Specified Conditions
Maximum Latency
 Environmental
Digital and Alarm Outputs
Real-Time Clock and Calendar
 General
 2625A Data Storage
2620A Options
 Ascii & IEEE-488 Bus Codes
 KEY
 IEEE-488.2 Devise Documentation Requirements
Implementation of Ieee Standard
 Program Message Program Message Terminator
 ALARMLIMIT?
 *RDT and *RDT? commands are not implemented
 Operation complete is generated when the command is parsed
 2620A/2625A
 Signal Cross Talk in a DC Voltage Channel
Making Mixed Measurements
 AC Signal Cross Talk Into a Frequency Channel
AC Signal Cross Talk Into an AC Voltage Channel
AC Signal Cross Talk Into an Ohms Channel
 AC Signal Crosstalk Into a Temperature Channel
 2620A/2625A
 Binary Upload of Logged Data LOGBIN? 2625A only
Decoding the Ascii String
 Figure E-1. Ascii String Decoding
 Floating Point Conversion
 Example
 Figure E-2. Floating Point Conversion
 Figure E-3. Example
 Cables
RS-232 Cabling
Connections
 Figure F-1. Summary of RS-232 Connections
 Figure F-2. Hydra DB-9 to PC DB-9 RS-232 Connection Generic
 Figure F-3. Hydra DB-9 to PC DB-25 RS-232 Connection
 Figure F-4. Hydra DB-9 to Modem DB-25 RS-232 Connection
 Figure F-5. Hydra DB-9 to Printer DB-25 RS-232 Connection
 Side
Connector
Side Male Female
 2620A/2625A
 Temperature Units
Scan Rate
Communication I/F
Output
 Index
 2620A/2625A