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