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Campbell CR7 manual available for free PDF download: Instruction Manual
Campbell CR7 Instruction Manual (186 pages)
Measurement and Control System
Brand:
Campbell
| Category:
Measuring Instruments
| Size: 1 MB
Table of Contents
Cr7 Operator's Manual
5
Warranty and Assistance
3
Table of Contents
5
Processing and Program Control Examples
7
Measurement Programming Examples
7
Installation
8
Selected Operating Details
9
Cautionary Notes
10
OV1.1 700X Control Module
11
CR7 Measurement and Control System
11
OV1.2 720 I/O Module
12
OV1.3 Enclosures and Connector Options
12
OV2.1 Internal Memory
13
Command Codes
14
Input/Output Instructions
14
OV2.2 CR7 Instruction Types
16
OV2.3 Program Tables and the Execution and Output Intervals
16
Ov3. Programming the Cr7
17
OV3.1 Functional Modes
18
OV3.2 Key Definition
18
OV3.3 Programming Sequence
18
OV3.4 Instruction Format
19
OV3.5 Entering a Program
19
Ov4. Programming Example
19
OV4.1 Measurement
20
OV4.2 Output
22
(User with Model 723 Card, no RTD
22
(User with Model 723-T RTD Card
22
OV4.3 Editing an Existing Program
24
OV4.4 EDLOG Program Listing
24
Ov5. Data Retrieval Options
25
Ov6. Specifications
27
1 Functional Modes
29
Program Tables - *1, *2, and *3 Modes
29
Setting and Displaying the Clock - *5 Mode
30
Displaying and Altering Input Memory or Flags - *6 Mode
30
Functional Modes
30
Sequence of Time Parameters in *5 Mode
30
Compiling and Logging Data - *0 Mode
31
Mode Commands
31
1.5 Memory Allocation - *A
32
Memory Testing and System Status - *B Mode
33
Description of *A Mode Data
33
1.7 *C Mode -- Security
34
Description of *B Mode Data
34
D Mode - Save or Load Program
35
C Mode Entries and Codes
35
D Mode Baud Rate and Storage Module Codes
35
D Mode Commands
35
Program Load Error Codes
36
2 Internal Data Storage
39
Final Storage Areas, Output Arrays, and Memory Pointers
39
Output Array ID
39
Data Output Format and Range Limits
40
Internal Data Storage
40
Displaying Stored Data on Keyboard/Display - *7 Mode
41
Decimal Location in Low Resolution Format
41
3 Instruction Set Basics
43
3.1 Parameter Data Types
43
3.2 Repetitions/Card Number
43
3.3 Entering Negative Numbers
43
3.4 Indexing Input Locations
44
Voltage Range and Overrange Detection
44
3.6 Output Processing
44
Input Voltage Ranges and Codes
44
Use of Flags: Output and Program Control
45
Flag Description
45
Program Control Logical Constructions
46
Instruction Memory and Execution Time
48
Input/Output Instruction Memory
48
Processing Instruction Memory and Execution Times
49
Output Instruction Memory and Execution Times
50
Program Control Instruction Memory and Execution Times
50
3.10 Error Codes
51
4 External Storage Peripherals
53
On-Line Data Transfer - Instruction 96, *4 Mode
53
Manually Initiated Data Output - *9 Modes
54
4.3 Storage Module
55
Mode Entries
55
4.4 Printer Output Formats
56
Telecommunications Commands
59
Remote Programming of the CR7
61
6.1 Pin Description
63
6.2 Enabling Peripherals
64
Interrupting Data Transfer to Storage Peripherals
64
Telecommunications - Modem Peripherals
64
Interfacing with Computers, Terminals, and Printers
64
7 Measurement Programming Examples
69
Single Ended Voltage-LI200S Silicon Pyranometer
69
Differential Voltage Measurement
69
Wiring Diagram for LI200S
69
Thermocouple Temperatures Using 723-T Reference
70
Thermocouple Temperatures Using an External Reference Junction
70
Typical Connection for Active Sensor with External Battery
70
Thermocouples for Differential Temperature Measurement
71
Temperature with Calibrated Thermocouples
72
7.7 107 Temperature Probe
73
7.8 207 Temperature and Rh Probe
73
Anemometer with Photochopper Output
74
Tipping Bucket Raingage with Long Leads
74
Wiring Diagram for Anemometer
74
Ohm PRT in 4 Wire Half-Bridge
75
Wiring Diagram for Raingage with Long Leads
75
Ohm PRT in 3 Wire Half-Bridge
76
Wire Half-Bridge Used to Measure 100 Ohm PRT
76
Ohm PRT in 4 Wire Full-Bridge
77
Wiring Diagram for Full Bridge Pressure Transducer
78
Pressure Transducer-4 Wire Full-Bridge
78
7.15 Lysimeter - 6 Wire Load Cell
79
Diagrammatic Representation of Lysimeter Weighing Mechanism
79
Wire Full Bridge Connection for Load Cell
80
Gypsum Soil Moisture Block
81
Gypsum Blocks Connected to the CR7
81
Nonlinear Thermistor in Half Bridge (CSI Model 101)
82
Thermistor Probes Connected to CR7
82
8 Processing and Program Control Examples
83
Computation of Running Average
83
8.2 Rainfall Intensity
84
SUB 1 Minute Output Interval Synched to Real Time
85
Analog Output to Strip Chart
86
Converting 0-360 Wind Direction Output to 0-540 for Strip Chart
87
Covariance Correlation Programming Example
88
Instructions
88
Example Outputs and Input Storage Locations
89
Example Input Channel and Location Assignments
89
Pulse Count Configuration Codes
93
Thermocouple Type Codes
96
10 Processing Instructions
103
Maximum Number of Outputs and Output Order for K Input Values
110
11 Output Processing Instructions
113
12 Program Control Instructions
119
Flag Description
119
Loop Example: Block Data Transform
121
Example: Loop with Delay Execution Interval = 10 Seconds
121
Comparison Codes
122
13 Cr7 Measurements
125
Fast and Slow Measurement Sequence
125
Single-Ended and Differential Voltage Measurements
125
Cr7 Measurements
126
Differential Voltage Measurement Sequence
126
The Effect of Sensor Lead Length on the Signal Settling Time
127
Input Voltage Rise and Transient Decay
127
Exponential Decay, Percent of Maximum Error Vs. Time in Units of Τ
128
Source Resistance Model for Half-Bridge Connected to the CR7
128
Typical Resistive Half-Bridge
128
Model 024A Wind Direction Sensor
129
Properties of Three Belden Lead Wires Used by Campbell Scientific
129
Wire Manufacturers Capacitance Specifications, C
129
Measured Peak Excitation Transients for 1000 Foot Lengths of Three Belden Lead Wires Used by Campbell Scientific
130
Resistive Half-Bridge Connected to Single-Ended CR7 Input
130
Summary of Input Settling Data for Campbell Scientific Resistive Sensors
131
Maximum Lead Length Vs. Error for Campbell Scientific Resistive Sensors
132
Shown in Figure 13.3-7
132
Source Resistances and Signal Levels for YSI #44032 Thermistor Configurations
133
Half-Bridge Configuration for YSI #44032 Thermistor Connected to CR7
134
Measuring Input Settling Error with the CR7
134
Thermocouple Measurements
135
Limits of Error for Thermocouple Wire
136
Example of Errors in Thermocouple Temperature
138
Reference Temperature Compensation Range and Polynomial Error Relative to NBS Standards
138
Bridge Resistance Measurements
139
Excitation and Measurement Sequence for 4 Wire Full Bridge
141
Calculating Resistance Values from Bridge Measurement
142
Resistance Measurements Requiring AC Excitation
143
AC Excitation and Measurement Sequence for AC Half-Bridge
143
13.7 Pulse Count Measurements
144
Measurements
125
14 Installation
145
Environmental Enclosure, Connectors and Junction Boxes
145
System Power Requirements and Options
146
Connecting Vehicle Power Supply to CR7
148
Humidity Effects and Control
149
Recommended Grounding Practices
149
Use of Digital Control Ports for Switching Relays
150
Typical Connection for Activating/Powering External Devices
150
15 I/O Card Addressing and Multiple I/0 Modules
151
I/O Card Identification Number Decoding
151
I/O Card Addressing and Multiple I/O Modules
152
Jumper Settings for Excitation and Pulse Counter Cards
153
15.2 Use of Multiple I/O Modules
154
Jumper Settings for Analog Input Cards
154
Location of Jumper Controlling Baud Rate to I/O Modules
157
Glossary
159
Cr7 Prom Signatures for Systems Equipped with Standard Software
163
Telecommunications Command with Binary Responses
165
Final Storage Format
165
C.2 Final Storage Format
167
C.3 Generation of Signature
169
Voltage Reference Calibration Procedure
171
Clock Calibration Procedure
172
List of Tables
175
List of Figures
177
Index
181
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