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