Users Manual
2620A/2625A
Hydra Series II Data Acquisition Unit Hydra Series II Data Logger
LIMITED WARRANTY & LIMITATION OF LIABILITY
5/94
Table of Contents
Title
Introduction
Overview
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Using the Computer Interface
Operating the Instrument from the Front Panel
Using the IEEE-488 Interface
Computer Interface Command Set
Using Shielded Wiring
Additional Considerations
Maintenance
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Appendices
Index
List of Tables
Title
Performance Tests for RTD Temperature Function DIN/IEC 751 Amendment
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Performance Tests Voltage, Resistance, and Frequency
Amendment 1 IPTS-68
List of Figures
Title
4-Terminal Connections to Decade Resistance Box
Hydra DB-9 to PC DB-9 RS-232 Connection Generic
Interference Information
Declaration of the Manufacturer or Importer
Bescheinigung des Herstellers/Importeurs
viii
Safety Terms in this Manual
Symbols Marked on Equipment
To avoid electric shock
∙ Remove inputs from live voltages before opening the input module
AC Power Source
DC Power Source
Use the Proper Power Cord
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Getting Started
Setting Up a Channel
Introduction
The Basics
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Selecting the Scan Data Destination
Taking Measurements
Getting Started continued
Press Mto activate the Monitor function
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Viewing Minimum, Maximum, and Last Data Values
LAST MIN MAX LAST MIN MAX
oo24f.eps
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Users Manual
Introduction
Chapter
Title
Page
2620A, 2625A
Users Manual
Options and Accessories
The Hydra Series II Data Acquisition Unit
The Hydra Series II Data Logger
IEEE-488 Interface Assembly
Table 1-1. Hydra Features
2620A, 2625A
Where to go From Here
Accessories
Where to go From Here
Introduction
Chapter 4 Using the Computer Interface
Chapter 6 Maintenance
Getting Started
Chapter 1 Introduction
Chapter
Overview
Title
2620A, 2625A
Users Manual
Setting Up the Instrument
Introduction
Adjusting the Handle
Unpacking and Inspecting the Instrument
Line Power
Front/Rear Panel Features
Overview
Setting Up the Instrument
Figure 2-2. Front Panel
Figure 2-4. Right Display
Figure 2-3. Left Display
Figure 2-5. Annunciators
Overview
Setting Up the Instrument
Table 2-1. Display Annunciators
Table 2-1. Display Annunciators cont
2620A, 2625A
Figure 2-6. Rear View
Turning the Instrument On
Operating Modes
Input Channels
Front Panel Display
Reading the Display
Left Display
Right Display
Using the Buttons
Front Panel Buttons
Selecting a Channel
Setting up a Channel
N O L K
Setting up a Channel
Setting Alarm Limits and Mx+B Scaling Values
Alarm Limits
Setting the Scan Interval
Mx+B Scaling
Using the Scan Function
Using the Monitor Function
Reviewing Channel Data
Using External DC Power
Viewing the Totalizer Count
Using the Rack Mount Kit
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Operating the Instrument from the Front Panel
Using the Digital I/O Lines
Changing the Temperature Unit
Setting Date and Time of Day
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Front Panel Review Only Function
Front Panel Monitor Only Function
Computer Interface-Initiated Lockouts
Configuration Mode
Figure 3-1. Configuration Mode
Introduction
Operating Modes
What is the Present Configuration?
Channel Configuration
Other Displayed Data
If Power is Interrupted
Channels 4-20 assigned to digital I/O lines 4-7, as follows
Table 3-1. Configuration Reset Settings
cleared for all channels
Page
Channel Configuration
Operating the Instrument from the Front Panel
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Setting Alarms
Alarm Limits
Channel Configuration
Operating the Instrument from the Front Panel
Alarm Indications
GAGE
Resetting Alarm Conditions
Using the Digital I/O Lines
Mx+B Scaling
Table 3-8. Initial Alarm Assignments, Digital I/O Lines 4 Through
B to define the scaling values
Page
Instrument Configuration
Entering and Changing Numeric Values
Selecting Scan Interval
Selecting the Measurement Rate
Changing the Temperature Unit
Triggering
External Triggering
Table 3-11. Measurement Rate Selection
Measurement Connections
Setting Date and Time of Day
To avoid electric shock
∙ Remove inputs from live voltages before opening the input module
DC Volts, AC Volts, Frequency, and Thermocouples
Operating the Instrument from the Front Panel
Measurement Connections
STRAIN RELIEF
Figure 3-2. Input Module Connections
Resistance and RTD
Measurement Connections
Operating the Instrument from the Front Panel
USE H AND L TERMINALS FOR ANY CHANNEL CHANNEL 0 ON FRONT PANEL
Totalizing
Review Array
General
Connections
List Button Functions
Table 3-16. List Button Operation
Note1
Autoprint
Memory Storage
Front Panel Review Only Function
Front Panel Lock out Conditions
Front Panel Monitor Only Function
Calibration
REM Annunciator
Computer Interface-Initiated Lockouts
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Users Manual
Using the Computer Interface
Installing the IEEE-488 Interface
Chapter
Title
Service Request Enable Register
Computer Interface Command Set
Status Byte Register
4-19
Using the RS-232 Computer Interface
To determine which computer interface is enabled, select COMM K
L. If IEEE appears on the display, the IEEE-488 interface is enabled
Otherwise, if a baud rate appears, the RS-232 interface is enabled
Setting Communication Parameters RS-232
Autoprint Computer Interface Control
Autoprint and Memory Storage RS-232
Autoprint Output Format
Memory Storage Computer Interface Control
Memory Retrieval
07420102/09/91
5 -3.2345 mMX+B H/R12123.87 kOHMS/L1731.268VAC ALM15DIO204TOTAL0
Clearing Memory
Memory Full Operation
Cabling the Instrument to a Host or Printer RS-232
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
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Figure 4-2. Sample Program
Using the IEEE-488 Interface
Using the Computer Interface
Figure 4-2. Sample Program cont
Table 4-3. IEEE-488 Setup BaudAddress
Enabling the IEEE-488 Interface
Capability
Table 4-2. IEEE-488.1 Capabilities Description
Installation Test
General Information RS-232 and IEEE-488
How the Instrument Processes Input
Input Strings
The instrument stores received input in a 350-byte input buffer
Input Terminators
Typical Input Strings
Using the Computer Interface
General Information RS-232 and IEEE-488
FUNC 1, OHMS, 3
FUNC 12, TEMP, K
Sending Input Strings to the Instrument
Sending Numeric Values to the Instrument RS-232 and IEEE-488
How the Instrument Processes Output
Service Requests IEEE-488 only and Status Registers
Output Queue
7 6 ESB
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Event Status and Event Status Enable Registers
Status Byte Register
Name
Table 4-4. Status Byte Register Description
Reading the Status Byte Register
Service Request Enable Register
Instrument Event Register
Computer Interface Command Set
Computer Interface Command Set
Using the Computer Interface
Table 4-7. Command and Query Summary
Table 4-7. Command and Query Summary cont
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Computer Interface Command Set
Using the Computer Interface
Table 4-7. Command and Query Summary cont
Table 4-8. Command and Query Reference
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Computer Interface Command Set
Using the Computer Interface
Table 4-8. Command and Query Reference cont
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Using the Computer Interface
Computer Interface Command Set
limitnum =
DOstate
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Return alarm limit data for specified channel and limit
Set instrument calendar values
Using the Computer Interface
Computer Interface Command Set
Table 4-8. Command and Query Reference cont
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Computer Interface Command Set
Using the Computer Interface
If the channel indicated is invalid, an Execution Error is generated. For valid channels, two or three comma-separated data fields are returned. One of the following function definitions is returned in the first data field
Table 4-8. Command and Query Reference cont
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Computer Interface Command Set
Using the Computer Interface
LOCK LOCK? LOCS LOG?
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LOGGED? LOGBIN? LOGCLR LOGCOUNT?
Computer Interface Command Set
Using the Computer Interface
Table 4-8. Command and Query Reference cont
Enables monitoring of given channel if monitoring
Table 4-8. Command and Query Reference cont
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Computer Interface Command Set
Using the Computer Interface
Next Scan’s Values
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Using the Computer Interface
Computer Interface Command Set
Table 4-8. Command and Query Reference cont
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Using the Computer Interface
Computer Interface Command Set
Table 4-8. Command and Query Reference cont
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Computer Interface Command Set
Using the Computer Interface
TOTAL TOTAL? TOTALDBNC TOTALDBNC? TRIGGER
alarm
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TRIGGER?
Trigger Type Query
Additional Considerations
External Trigger Enabled Type
Monitor Alarm Enabled Type
When Measuring Resistance or Temperature RTD
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Users Manual
Measurement Rate
Advanced Trigger Mechanisms
Introduction
These two additional trigger mechanisms are mutually exclusive
External Trigger Enabled Type
Both External and Monitor Alarms Disabled Type
REMS, a *TRG can be generated from the front panel by pressing Q
Additional Considerations
Advanced Trigger Mechanisms
Thermal Voltages
When Measuring Resistance or Temperature RTD
Monitor Alarm Enabled Type
Additional Considerations
When Measuring Resistance or Temperature Rtd
oo16f.eps
Effects of Internal Noise in AC Measurements
True RMS Measurements
Waveform Comparison True RMS vs Average Responding
Making Mixed Measurements
Making Mixed Measurements
Figure 5-3. Comparison of Common Waveforms
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TO DISPLAY RMS FOR SINE WAVES
Using Shielded Wiring
Non-Isolated Sensor Configuration
Isolated and Shielded Sensor Configuration
WWarning
In More Detail
Maintenance
Thermocouple Temperature Accuracy Test
Dedicated Alarm Output Test
Chapter
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Users Manual
Cleaning
Self-Test Diagnostics and Error Codes
Line Fuse
When the instrument is powered up, the entire display lights
Performance Tests
Maintenance
Error
Table 6-1. Power-Up Error Codes Description
Performance Tests
Table 6-2. Recommended Test Equipment Minimum Specification
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Instrument Type
Recommended Model
Accuracy Verification Test
Channel Integrity Test
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20 mV
Thermocouple Measurement Range Accuracy Test
Table 6-3. Performance Tests Voltage, Resistance, and Frequency cont
4-Terminal Resistance Test
Thermocouple Temperature Accuracy Test
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EX SNS
EX GRD
OUTPUT
Open Thermocouple Response Test
DECADE RESISTANCE BOX
HYDRA INPUT MODULE
J K N E T
RTD Temperature Accuracy Test
RTD Temperature Accuracy Test Using Decade Resistance Source
RTD Temperature Accuracy Test Using DIN/IEC
Digital Input/Output Verification Tests
DOLEVEL 0,0 CR Assure output 0 measures a LOW state. DOLEVEL 1,0 CR
Digital Output Test
Digital Input Test
Totalizer Test
TERMINAL GROUNDED
Table 6-7. Digital Input Values STATE OF DIGITAL INPUTS
DECIMAL VALUE
Totalizer Sensitivity Test
Dedicated Alarm Output Test
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V ΩA
External Trigger Input Test
Calibration
Calibration
Service
Variations in the Display
Appendix
Appendices
Title
Page
Specifications
Appendix A
Accuracies at Ambient Temperatures Other Than Specified
Introduction
DC Voltage Inputs
Normal Mode Rejection
Common Mode Rejection
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Thermocouple Inputs
Appendices
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RTD Inputs
Common Mode and Normal Mode Rejection
Appendices
Input Impedance
AC Voltage Inputs
2-Wire Accuracy
Maximum Sensor Temperature
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Appendices
Crest Factor Error
Common Mode Rejection
DC Component Error
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Ohms Inputs
2-Wire Accuracy
Appendices
Input Protection
Frequency Inputs
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Frequency Range
Sensitivity
Appendices
Typical Scanning Rate
A-11
Maximum Autoranging Time
Totalizing Input
Digital Inputs
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Trigger Input
Appendices
Isolation
Threshold
Digital and Alarm Outputs
Real-Time Clock and Calendar
Environmental
Battery Life
General
Common Mode Voltage
Weight
Appendices
2625A Data Storage
2620A Options
Power
2620A/2625A
ASCII & IEEE-488 Bus Codes
Appendix B
ASCII & BUS CODES
IEEE-488.2 Devise Documentation Requirements
Appendix C
Implementation of IEEE Standard
The initial power-up device setting is Channels 0 - 20OFF
Alarm parameters Limit-1 and Limit-2 OFF. All limit values
Alarm assignments Channels 0-3 assigned to outputs 0-3,respectively
Digital I/O lines high non-alarm Totalizer 0, with debounce disabled
Open Thermocouple Detection OTC enabled
COMMAND MESSAGE UNIT QUERY MESSAGE UNIT COMMAND PROGRAM HEADER
The following queries return data in two formats ALARMLIMIT?
Appendices
PROGRAM MESSAGE UNIT PROGRAM MESSAGE UNIT SEPARATOR
The *CAL? command not implemented an optional command
The *RDT and *RDT? commands are not implemented
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There are no device-to-device messages
Operation complete is generated when the command is parsed
Appendices
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Signal Cross Talk in a DC Voltage Channel
Making Mixed Measurements
Appendix D
Introduction
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
Ratio worst case
AC Signal Crosstalk Into a Temperature Channel
TEMPERATURE Error Ratio = ⎢
5.0 ×
2.0 ×
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Binary Upload of Logged Data LOGBIN? 2625A only
Appendix E
Decoding the ASCII String
Introduction
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Figure E-1. ASCII String Decoding
Floating Point Conversion
Appendices
Example
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Appendices
Figure E-2. Floating Point Conversion
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Figure E-3. Example
RS-232 Cabling
Appendix F
Connections
Cables
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RS43
PRINTER
PRINTER
RTS - REQUEST TO SEND CTS - CLEAR TO SEND RI - RING INDICATOR
Appendices
RS43 CABLE NULL MODEM
DCD Rx Tx DTR GND DSR RTS CTS RI
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Rx Tx DTR GND DSR RTS CTS
RS40 CABLE OR EQUAL
Tx Rx RTS CTS DSR GND DCD
Appendices
Figure F-4. Hydra DB-9 to Modem DB-25 RS-232 Connection
2620A/2625A
Rx Tx DTR GND DSR RTS CTS
RS42 CABLE OR EQUAL
Tx Rx RTS CTS DSR GND DCD
Figure F-6. RS-232 DB9 and DB-25 Connectors
Appendices
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Hydra Configuration Record
Index