Campbell Scientific CDM-A100 Owner's manual

INSTRUCTION MANUAL

CDM-A100 Series

CDM-A108 and CDM-A116

Revision: 2/16

Campbell Scientific, Inc.

Limited Warranty

“Products manufactured by CSI are warranted by CSI to be free from defects

in materials and workmanship under normal use and service for twelve months

from the date of shipment unless otherwise specified in the corresponding

product manual. (Product manuals are available for review online at

www.campbellsci.com.) Products not manufactured by CSI, but that are resold

by CSI, are warranted only to the limits extended by the original manufacturer.

Batteries, fine-wire thermocouples, desiccant, and other consumables have no

warranty. CSI’s obligation under this warranty is limited to repairing or

replacing (at CSI’s option) defective Products, which shall be the sole and

exclusive remedy under this warranty. The Customer assumes all costs of

removing, reinstalling, and shipping defective Products to CSI. CSI will return

such Products by surface carrier prepaid within the continental United States of

America. To all other locations, CSI will return such Products best way CIP

(port of entry) per Incoterms ® 2010. This warranty shall not apply to any

Products which have been subjected to modification, misuse, neglect, improper

service, accidents of nature, or shipping damage. This warranty is in lieu of all

other warranties, expressed or implied. The warranty for installation services

performed by CSI such as programming to customer specifications, electrical

connections to Products manufactured by CSI, and Product specific training, is

part of CSI's product warranty. CSI EXPRESSLY DISCLAIMS AND

EXCLUDES ANY IMPLIED WARRANTIES OF MERCHANTABILITY

OR FITNESS FOR A PARTICULAR PURPOSE. CSI hereby disclaims,

to the fullest extent allowed by applicable law, any and all warranties and

conditions with respect to the Products, whether express, implied or

statutory, other than those expressly provided herein.”

Assistance

Products may not be returned without prior authorization. The following

contact information is for US and international customers residing in countries

served by Campbell Scientific, Inc. directly. Affiliate companies handle

repairs for customers within their territories. Please visit

www.campbellsci.com to determine which Campbell Scientific company serves

your country.

To obtain a Returned Materials Authorization (RMA), contact CAMPBELL

SCIENTIFIC, INC., phone (435) 227-9000. After an application engineer

determines the nature of the problem, an RMA number will be issued. Please

write this number clearly on the outside of the shipping container. Campbell

Scientific’s shipping address is:

CAMPBELL SCIENTIFIC, INC.

RMA#_____

815 West 1800 North

Logan, Utah 84321-1784

For all returns, the customer must fill out a “Statement of Product Cleanliness

and Decontamination” form and comply with the requirements specified in it.

The form is available from our web site at www.campbellsci.com/repair. A

completed form must be either emailed to repair@campbellsci.com or faxed to

(435) 227-9106. Campbell Scientific is unable to process any returns until we

receive this form. If the form is not received within three days of product

receipt or is incomplete, the product will be returned to the customer at the

customer’s expense. Campbell Scientific reserves the right to refuse service on

products that were exposed to contaminants that may cause health or safety

concerns for our employees.

Safety

DANGER — MANY HAZARDS ARE ASSOCIATED WITH INSTALLING, USING, MAINTAINING, AND WORKING ON OR AROUND

TRIPODS, TOWERS, AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES,

ANTENNAS, ETC. FAILURE TO PROPERLY AND COMPLETELY ASSEMBLE, INSTALL, OPERATE, USE, AND MAINTAIN TRIPODS,

TOWERS, AND ATTACHMENTS, AND FAILURE TO HEED WARNINGS, INCREASES THE RISK OF DEATH, ACCIDENT, SERIOUS

INJURY, PROPERTY DAMAGE, AND PRODUCT FAILURE. TAKE ALL REASONABLE PRECAUTIONS TO AVOID THESE HAZARDS.

CHECK WITH YOUR ORGANIZATION'S SAFETY COORDINATOR (OR POLICY) FOR PROCEDURES AND REQUIRED PROTECTIVE

EQUIPMENT PRIOR TO PERFORMING ANY WORK.

Use tripods, towers, and attachments to tripods and towers only for purposes for which they are designed. Do not exceed design

limits. Be familiar and comply with all instructions provided in product manuals. Manuals are available at www.campbellsci.com or

by telephoning (435) 227-9000 (USA). You are responsible for conformance with governing codes and regulations, including safety

regulations, and the integrity and location of structures or land to which towers, tripods, and any attachments are attached. Installation

sites should be evaluated and approved by a qualified engineer. If questions or concerns arise regarding installation, use, or

maintenance of tripods, towers, attachments, or electrical connections, consult with a licensed and qualified engineer or electrician.

General

• Prior to performing site or installation work, obtain required approvals and permits. Comply

with all governing structure-height regulations, such as those of the FAA in the USA.

• Use only qualified personnel for installation, use, and maintenance of tripods and towers, and

any attachments to tripods and towers. The use of licensed and qualified contractors is highly

recommended.

• Read all applicable instructions carefully and understand procedures thoroughly before

beginning work.

• Wear a hardhat and eye protection, and take other appropriate safety precautions while

working on or around tripods and towers.

• Do not climb tripods or towers at any time, and prohibit climbing by other persons. Take

reasonable precautions to secure tripod and tower sites from trespassers.

• Use only manufacturer recommended parts, materials, and tools.

Utility and Electrical

• You can be killed or sustain serious bodily injury if the tripod, tower, or attachments you are

installing, constructing, using, or maintaining, or a tool, stake, or anchor, come in contact with

overhead or underground utility lines.

• Maintain a distance of at least one-and-one-half times structure height, 20 feet, or the distance

required by applicable law, whichever is greater, between overhead utility lines and the

structure (tripod, tower, attachments, or tools).

• Prior to performing site or installation work, inform all utility companies and have all

underground utilities marked.

• Comply with all electrical codes. Electrical equipment and related grounding devices should

be installed by a licensed and qualified electrician.

Elevated Work and Weather

• Exercise extreme caution when performing elevated work.

• Use appropriate equipment and safety practices.

• During installation and maintenance, keep tower and tripod sites clear of un-trained or non-

essential personnel. Take precautions to prevent elevated tools and objects from dropping.

• Do not perform any work in inclement weather, including wind, rain, snow, lightning, etc.

Maintenance

• Periodically (at least yearly) check for wear and damage, including corrosion, stress cracks,

frayed cables, loose cable clamps, cable tightness, etc. and take necessary corrective actions.

• Periodically (at least yearly) check electrical ground connections.

WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS,

THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR

MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS,

ENCLOSURES, ANTENNAS, ETC.

i

Table of Contents

PDF viewers: These page numbers refer to the printed version of this document. Use the

PDF reader bookmarks tab for links to specific sections.

1. Introduction ................................................................ 1

2. Precautions ................................................................ 1

3. Initial Inspection ......................................................... 1

4. QuickStart ................................................................... 2

5. Overview ..................................................................... 6

5.1 Wiring Panel – Overview ..................................................................... 6

5.1.1 Analog Input ................................................................................. 8

5.1.1.1 Single-Ended Measurements .............................................. 8

5.1.1.2 Differential Measurements ................................................. 9

5.1.1.3 Period-Averaging ............................................................... 9

5.1.2 Voltage and Current Excitation..................................................... 9

5.1.3 Switched Voltage Output .............................................................. 9

5.1.4 Grounding Terminals .................................................................... 9

5.1.5 Power Terminals ......................................................................... 10

5.1.5.1 Power In ........................................................................... 10

5.1.5.2 Power Out ......................................................................... 10

5.1.6 Communication Ports.................................................................. 10

5.1.6.1 USB Port .......................................................................... 10

5.1.6.2 CPI Port ............................................................................ 10

5.1.7 LED Indicators ............................................................................ 10

5.1.7.1 COMM Status .................................................................. 10

5.1.7.2 CPI Port ............................................................................ 10

6. Specifications ........................................................... 10

6.1 Voltage Measurements – Specifications ............................................ 11

6.2 Resistance Measurements – Specifications ........................................ 13

6.3 Voltage and Current Excitation – Specifications ............................... 13

6.4 Period Averaging – Specifications ..................................................... 14

6.5 Voltage Output – Specifications ........................................................ 14

6.5.1 Continuous 12 Vdc ..................................................................... 14

6.5.2 Switched 12 Vdc ......................................................................... 15

6.5.3 Switched 5 Vdc ........................................................................... 15

6.6 Module – Specifications ..................................................................... 16

6.6.1 Communications ......................................................................... 16

6.6.2 System ......................................................................................... 16

6.6.3 Power Requirements ................................................................... 16

6.6.4 Compliance ................................................................................. 16

6.6.5 Physical Attributes ...................................................................... 16

7. Installation ................................................................ 16

7.1 Install Driver for PC Connection ....................................................... 16

Table of Contents

ii

7.2

Compatible Operating Systems ......................................................... 17

7.3 Configuring the CDM-A100 Series ................................................... 17

7.3.1 Configuring with the CPIAddModule() Instruction ................... 17

7.3.2 Configuring with Device Configuration Utility ......................... 17

7.3.3 Configuring with the CPIStatus Table ....................................... 18

7.4 Datalogger Connection ...................................................................... 18

7.5 Connecting Multiple CDMs .............................................................. 19

7.5.1 Daisy-Chain Topology ............................................................... 19

7.5.2 Star Topology ............................................................................. 19

7.6 Power Connection ............................................................................. 19

7.7 Earth Ground Connection .................................................................. 20

7.8 Datalogger Programming .................................................................. 20

8. Operation .................................................................. 21

8.1 Measurements.................................................................................... 21

8.1.1 First Notch Frequency ................................................................ 21

8.1.2 Panel Temperature ..................................................................... 22

8.1.3 Fast Measurements ..................................................................... 23

8.1.3.1 Sub-Scans ........................................................................ 24

8.1.3.2 Burst Measurements ........................................................ 25

8.2 Switched Voltage Output .................................................................. 26

8.2.1 Switched 5 Vdc .......................................................................... 26

8.2.2 Switched 12 Vdc ........................................................................ 26

8.3 Multiple Devices ............................................................................... 26

9. Maintenance ............................................................. 26

9.1 Factory Calibration or Repair Procedure ........................................... 26

10. Troubleshooting ....................................................... 27

10.1 Troubleshooting – Basic Procedure ................................................... 27

10.2 Troubleshooting – CPIStatus Table................................................... 27

10.3 COMM status LED ........................................................................... 28

10.4 CPI Port LEDs ................................................................................... 28

10.5 Replacing a CDM-A108 or CDM-A116 ........................................... 28

11. Glossary .................................................................... 28

12. References ................................................................ 29

Appendices

A. Importing Short Cut Code Into CRBasic Editor ... A-1

B. Example Programs ................................................. B-1

B.1 Adding CDMs with CPIAddModule() ............................................ B-1

B.2 Measuring Thermocouples .............................................................. B-2

B.3 Controlling an AM16/32B Multiplexer ........................................... B-3

B.4 Measuring Bonded Foil Strain Gages .............................................. B-4

Table of Contents

iii

C. Analog Voltage Measurement Range and

Resolution ............................................................ C-1

D. CRBasic Programming Instructions ..................... D-1

D.1 Measurement Instructions ............................................................... D-1

D.1.1 Diagnostics .............................................................................. D-1

D.1.2 Voltage ..................................................................................... D-1

D.1.3 Thermocouples ......................................................................... D-2

D.1.4 Resistive-Bridge Measurements .............................................. D-2

D.1.5 Excitation ................................................................................. D-3

D.1.5 Period Averaging ..................................................................... D-4

D.1.7 Control ..................................................................................... D-4

D.1.8 Specific Sensors ....................................................................... D-4

D.1.9 Peripheral Device Support ....................................................... D-5

Figures

5-1. Wiring panel of CDM-A108 (left) and CDM-A116 (right) ................. 7

5-2. Power and CPI ports view .................................................................... 8

6-1. Current sourcing on SW5V terminals ................................................ 15

7-1. Multiple CDM-A108s connected in a daisy-chain topology .............. 19

7-2. Multiple CDM-A108s connected in a star topology .......................... 19

7-3. Opening the power connector terminals ............................................. 20

8-1. Wiring panel thermistor locations on CDM-A108 (left) and

CDM-A116 (right) .......................................................................... 23

Tables

6-1. Analog Voltage Measurement Accuracy Offsets ............................... 12

6-2. Analog Voltage Measurement Speed ................................................. 12

6-3. Period Average Ranges ...................................................................... 14

8-1. Multiplexed Analog Voltage Measurement Speed ............................ 24

10-1. CPIStatus Activity.............................................................................. 27

10-2. COMM Status LED Activity ............................................................. 28

10-3. CPI Port LED Activity ....................................................................... 28

C-1. Analog Voltage Measurement Range and Resolution...................... C-1

CRBasic Examples

7-1. Measuring a Single-Ended Voltage.................................................... 21

8-1. Measuring VoltSE() in a Sub-Scan .................................................... 25

8-2. Measuring VoltSE() in Burst Mode ................................................... 25

B-1. Adding CDMs with CPIAddModule() ............................................. B-1

B-2. Measuring Thermocouples ............................................................... B-2

B-3. Controlling an AM16/32B Multiplexer............................................ B-3

B-4. Measuring Bonded Foil Strain Gages .............................................. B-4

Table of Contents

iv

1

CDM-A100 Series

1. Introduction

The CDM-A108 and CDM-A116 are Campbell Distributed Modules (CDMs)

for analog measurements. They feature a 24-bit analog-to-digital converter and

low-noise, high-speed measuring circuitry. The CDM-A108 and CDM-A116

add 8 and 16 analog-input terminals to a datalogger-measurement system.

Connect up to 120 CDMs to a single datalogger.

Throughout this manual, any reference to the CDM-A108 also applies to the

CDM-A116, unless specifically noted.

2. Precautions

• READ AND UNDERSTAND the Safety section at the front of this

manual.

• WARNING:

o Protect from over-voltage

o Protect from water

o Protect from ESD (electrostatic discharge)

• IMPORTANT: Maintain a level of calibration appropriate to the

application. Campbell Scientific recommends factory recalibration of the

CDM-A108 every three years.

3. Initial Inspection

• The CDM-A108 and CDM-A116 ship with the following:

o Pn 29389, CDM Parts Kit (1)

o ResourceDVD (1), which includes the following:

− This manual

− Device Configuration Utility software (DevConfig

(p. 29))

• Inspect the packaging and contents for damage immediately. File damage

claims with the shipping company.

• Check packaging materials for all products. Check model numbers, part

numbers, product descriptions, and cable lengths against shipping

documents. Model or part numbers are found on each product. Cable

numbers are normally found at the end of the cable that connects to the

measurement device. Check that expected cable lengths were received.

Contact Campbell Scientific immediately if you find any discrepancies.

• Check the operating system

(p. 29) version in the CDM-A108, the

datalogger, and the SC-CPI (p. 29) (if used), and update as needed. See

Section 7.2, Compatible Operating Systems (p. 17).

CDM-A100 Series

2

4. QuickStart

Short Cut is an easy way to program your datalogger to measure sensors

through a CDM-A108 or CDM-A116 and assign wiring terminals. Short Cut is

available as a download on www.campbellsci.com and the ResourceDVD. It is

included in installations of LoggerNet, PC200W, PC400, or RTDAQ.

This section will guide you through programming a CR6 datalogger to read a

single-ended voltage measured by a CDM-A108. With minor changes, these

steps can apply to other compatible dataloggers and measurements.

1. Open Short Cut. Click New Program.

2. Select Datalogger Model and Scan Interval (default of 5 seconds is OK

for most applications). Click Next.

CDM-A100 Series

3

3. Under the Available Sensors and Devices list, select the Devices folder,

then select the CDM-A108. Click to move the selection to the

Selected device window.

4. When the CDM-A108 is added as a device, a new CDM-A108 tab will

appear at the bottom of the Available Sensors and Devices pane. With the

CDM-A108 tab selected, select the Sensors | Generic Measurements

subfolder. Select Single-Ended Voltage. Click to move the selection

to the Selected device window.

CDM-A100 Series

4

5. In the resulting window, enter the CPI Address of the CDM-A108. The

default address is 1.

6. Next, provide the attributes of the single-ended measurement. Leave all

settings at the default for this example. To learn more about any setting,

click Help.

CDM-A100 Series

5

7. After selecting the measurement, click Wiring Diagram to see how the

sensor is to be wired to the datalogger. The wiring diagram can be printed

now or after more sensors are added. The CR6 Series tab shows the

connection between the CDM-A108 and the datalogger, and the CDM-

A108 tab shows the sensor connection to the CDM-A108.

8. Select any other sensors you have in the Sensors section, and then finish

the remaining Short Cut steps to complete the program. The remaining

steps are outlined in Short Cut Help, which is accessed by clicking on

Help | Contents | Programming Steps.

9. If LoggerNet, PC400, RTDAQ, or PC200W is running on your PC, and the

PC to datalogger connection is active, you can click Finish in Short Cut,

and you will be prompted to send the program just created to the

datalogger.

CDM-A100 Series

6

10. Wire the sensors and devices as shown in the wiring diagrams in step 7.

Check the output of the sensor in the datalogger support software

(p. 29)

data display to make sure it is making reasonable measurements.

5. Overview

The CDM-A108 expands the number of analog measurement channels and

increases the measurement-speed potential in a datalogger system. CDMs

operate through a datalogger program and communicate using the CAN

peripheral interface (CPI

(p. 28)). A single datalogger can operate up to 120

CDMs.

5.1 Wiring Panel – Overview

To avoid damage to sensors and devices, ensure that each

removable wiring-terminal strip is connected to the CDM-

A108 and CDM-A116 in the proper location before applying

power. Each strip is keyed identically.

CAUTION

CDM-A100 Series

7

FIGURE 5-1. Wiring panel of CDM-A108 (left) and CDM-A116 (right)

Signal Ground

Earth Ground

Analog Input

Terminals

Excitation

Terminals

Switched 5 V

Power Ground

Switched 12 V

12 V Out

COMM

Status LED

USB

CDM-A100 Series

8

FIGURE 5-2. Power and CPI ports view

5.1.1 Analog Input

Analog sensors output a continuous voltage or current signal that varies with

the phenomena measured. Sensors compatible with the CDM-A108 output a

voltage. Current output can be made compatible with a resistive shunt.

Sensor connection is to H/L terminals configurable for differential (DIFF),

single-ended (SE), or period-average inputs. For example, differential channel

1 is comprised of terminals 1H and 1L, with 1H as high and 1L as low.

• Maximum input voltage range: ±5000 mV

• Measurement resolution range: 0.020 to 14.756 µV

RMS

5.1.1.1 Single-Ended Measurements

A single-ended measurement measures the difference in voltage between the

terminal configured for single-ended input and the reference ground. Single-

ended terminals are labeled in blue. The CDM-A108 has 16 SE terminals, and

the CDM-A116 has 32. For example, single-ended channel 1 is comprised of

terminals 1 and

⏚

.

CPI Port LED

Indicators

Power In

CPI Ports

CDM-A100 Series

9

5.1.1.2 Differential Measurements

A differential measurement measures the difference in voltage between two

input terminals. Use a differential measurement to measure current by using

external resistors to convert current to voltage. The CDM-A108 has 8 H/L

differential terminals, and the CDM-A116 has 16.

5.1.1.3 Period-Averaging

Single-ended terminals on the CDM-A108 and CDM-A116 are also

configurable for measuring the period of an analog signal.

• Voltage gain: 1, 3.8, 19, 67

• Maximum frequency: 200 kHz

• Resolution: 130 ns ÷ number of cycles to be measured

5.1.2 Voltage and Current Excitation

X terminals supply switched voltage or current to sensors. The CDM-A108 has

two X terminals, and the CDM-A116 has four.

• Voltage Excitation (switched-analog output) – X terminals,

configured for voltage excitation output, supply precise voltage in the

range of ±5000 mV. These terminals are regularly used with resistive-

bridge measurements. Each terminal will source up to ±50 mA.

• Current Excitation (switched-analog output) – X terminals, configured

for current excitation output, supply precise current in the range of

±2.5 mA. These terminals are regularly used with resistive-bridge

measurements.

5.1.3 Switched Voltage Output

SW5V and SW12V terminals supply voltage and control for sensors. The

CDM-A108 includes two SW5V and one SW12V terminals. The CDM-A116

includes four SW5V and two SW12V terminals.

• 5 V control – SW5V terminals supply 5000 mV. See Section 6.5.3,

Switched 5 Vdc

(p. 15), for information on voltage and current sourcing

limits.

• Switched 12 V – SW12V terminals supply 12 V and will source up to

200 mA each.

5.1.4 Grounding Terminals

Proper grounding lends stability and protection to a data acquisition system. It

is the easiest and least expensive insurance against data loss — and often the

most neglected. The following terminals are provided for connection of sensor

and CDM-A108 grounds:

• Signal Ground (⏚) – reference for single-ended analog inputs,

excitation returns, and as a ground for sensor shield wires. Current

loop sensors, however, should be grounded to power ground.

• Power Ground (G) – return for 5V, 12V, and current loop sensors. Use

of G grounds for these outputs minimizes potentially large current

flow through the analog-voltage-measurement section of the wiring

panel, which can cause single-ended voltage measurement errors.

CDM-A100 Series

10

• Earth Ground Lug (⏚) – connection point for a heavy-gage earth-

ground wire. A good earth connection is necessary to secure the

ground potential of the CDM-A108 and shunt transients away from

electronics. 14 AWG wire, minimum, is recommended.

5.1.5 Power Terminals

5.1.5.1 Power In

The removable Power connector is the connection point for external power

supply components. The power supply must be in the range of 10 to 32 Vdc.

5.1.5.2 Power Out

The CDM-A108 can be used as a power source for sensors. The following

voltage terminals are available:

• 12V and SW12V – Regulated 12 Vdc when the supply voltage is 14.5

to 32 Vdc. Below 14.5 Vdc, the voltage tracks the power supply.

Current output is limited to 200 mA.

• SW5V – See Section 6.5.3, Switched 5 Vdc

(p. 15), for information on

voltage and current sourcing limits.

5.1.6 Communication Ports

5.1.6.1 USB Port

One micro-B USB port, labeled USB, for communicating with a PC through

Device Configuration Utility

(p. 29) software.

5.1.6.2 CPI Port

CPI

(p. 28) is a proprietary protocol that supports CDMs. Two RJ45 ports labeled

CPI enable communications with a Campbell Scientific datalogger and other

CDMs.

5.1.7 LED Indicators

5.1.7.1 COMM Status

When the CDM-A108 has successfully been configured by a datalogger, the

COMM Status LED

(p. 29) will flash green. For scan rates 500 ms or slower, it

will flash at the scan rate. For faster scan rates, the LED will flash green every

few scans. See

TABLE 10-2, COMM Status LED Activity (p. 28).

5.1.7.2 CPI Port

When the CDM-A108 has successfully been configured by a datalogger, the

green LED

(p. 29) on the CPI port will flash. For scan rates 500 ms or slower, it

will flash at the scan rate. For faster scan rates, the green LED will flash every

few scans. See

TABLE 10-3, CPI Port LED Activity (p. 28).

6. Specifications

All CDM-A108 units are tested to meet electrical specifications in a standard

–40 to 70 °C, or extended –55 to 85 °C, non-condensing environment.

Recommended calibration interval is every three years.

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Campbell Scientific CDM-A100 Owner's manual

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