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