Pico Adc-20 User manual

ADC-20/ADC-24

User's Guide

adc20.en r5

High-Resolution Data Loggers

ContentsI

Contents

....................................................................................................................................11 Introduction

........................................................................................................................................1

1 Overview

....................................................................................................................................22 Notices

........................................................................................................................................2

1 Safety warning

........................................................................................................................................3

2 Legal information

........................................................................................................................................3

3 CE notice

........................................................................................................................................3

4 FCC notice

........................................................................................................................................4

5 Trademarks

........................................................................................................................................4

6 Updates

........................................................................................................................................4

7 Support and refunds

........................................................................................................................................4

8 Company details

....................................................................................................................................53 Getting started

........................................................................................................................................5

1 Installing the software

........................................................................................................................................5

2 Connecting the data logger

........................................................................................................................................7

3 Starting PicoLog

....................................................................................................................................104 About the unit

........................................................................................................................................10

1 Introduction

........................................................................................................................................11

2 Specifications

........................................................................................................................................12

3 Analog connector

........................................................................................................................................13

4 Noise-free resolution and conversion time

........................................................................................................................................13

5 ADC-20/ADC-24 terminal board

........................................................................................................................................13

6 LED

....................................................................................................................................145 Programmer's reference

........................................................................................................................................14

1 Recording methods

........................................................................................................................................14

2 Windows driver

........................................................................................................................................14

3 Scaling

........................................................................................................................................15

4 Driver functions

......................................................................................................................................................................16

1 HRDLCloseUnit

......................................................................................................................................................................17

2 HRDLCollectSingleValueAsync

......................................................................................................................................................................18

3 HRDLGetMinMaxAdcCounts

......................................................................................................................................................................19

4 HRDLGetNumberOfEnabledChannels

......................................................................................................................................................................20

5 HRDLGetSingleValue

......................................................................................................................................................................21

6 HRDLGetSingleValueAsync

......................................................................................................................................................................23

7 HRDLGetTimesAndValues

......................................................................................................................................................................24

8 HRDLGetUnitInfo

......................................................................................................................................................................26

9 HRDLGetValues

......................................................................................................................................................................27

10 HRDLOpenUnit

......................................................................................................................................................................28

11 HRDLOpenUnitAsync

......................................................................................................................................................................29

12 HRDLOpenUnitProgress

......................................................................................................................................................................30

13 HRDLReady

......................................................................................................................................................................31

14 HRDLRun

......................................................................................................................................................................32

15 HRDLSetAnalogInChannel

IIADC-20/ADC-24 User's Guide

......................................................................................................................................................................33

16 HRDLSetDigitalIOChannel (ADC-24 only)

......................................................................................................................................................................35

17 HRDLSetInterval

......................................................................................................................................................................36

18 HRDLSetMains

......................................................................................................................................................................37

19 HRDLStop

........................................................................................................................................38

5 Programming languages

......................................................................................................................................................................38

1 C and C++

......................................................................................................................................................................38

2 Delphi V3

......................................................................................................................................................................38

3 Excel

......................................................................................................................................................................39

4 LabVIEW

......................................................................................................................................................................39

5 Visual Basic

........................................................................................................................................40

6 Sequence of calls and data flow

......................................................................................................................................................................40

1 Streaming recording methods

......................................................................................................................................................................42

2 Single-value recording methods

....................................................................................................................................436 Glossary

....................................................................................................................................45

Index

Introduction1

1 Introduction

1.1 Overview

The ADC-20 and ADC-24 High-Resolution Data Loggers are multichannel, high-

accuracy USB data loggers for use with PCs. They require no external power supply

and take up no expansion slots. They come complete with PicoLog, a program offering

all the features of a stand-alone data logger.

You should have the following items in your ADC-20 or ADC-24 package:

ADC-20 or ADC-24 High-Resolution Data Logger

Pico Technology Software and Reference CD

Installation Guide

The CD includes driver software that enables you to write your own programs to

control the data logger, using a variety of popular programming languages.

The hardware and software are compatible with Microsoft Windows XP (SP3) or later.

Optional accessories

PP310 ADC-20/ADC-24 Terminal Board

ADC-20/ADC-24 User's Guide 2

2 Notices

2.1 Safety warning

We strongly recommend that you read the general safety information below before

using your product for the first time. If the equipment is not used in the manner

specified, then the protection provided may be impaired. This could result in damage

to your computer and/or injury to yourself or others.

Maximum input range. The ADC-20 and ADC-24 are designed to measure voltages

in the range ±2.5 volts, but are protected against overvoltages of ±30 volts. Any

voltages outside the overvoltage protection range may cause permanent damage to

the unit.

Mains voltages. Pico products are not designed for use with mains voltages.

Safety grounding. The ground of every product is connected directly to the ground of

your computer via the interconnecting cable provided. This is done to minimize

interference. If the PC (especially laptops) is not grounded, reading stability cannot be

guaranteed and it may be necessary to manually ground the equipment.

As with most data loggers, you should take care to avoid connecting the inputs of the

product to any equipment which may be at an unsuitable voltage. If in doubt, use a

meter to check that there is no hazardous AC or DC voltage. Failure to check may

cause damage to the product and/or computer and could cause injury to yourself or

others.

You should assume that the product does not have a protective safety earth. Incorrect

configuration and/or use on voltages outside the maximum input range can be

hazardous.

Repairs. The unit contains no user-serviceable parts: repair or calibration of the unit

requires specialised test equipment and must be performed by Pico Technology

Limited or their authorized distributors.

Notices3

2.2 Legal information

The material contained in this release is licensed, not sold. Pico Technology Limited

grants a licence to the person who installs this software, subject to the conditions

listed below.

Access. The licensee agrees to allow access to this software only to persons who have

been informed of these conditions and agree to abide by them.

Usage. The software in this release is for use only with Pico products or with data

collected using Pico products.

all material (software, documents etc.) contained in this release. You may copy and

distribute the entire release in its original state, but must not copy individual items

within the release other than for backup purposes.

Liability. Pico Technology and its agents shall not be liable for any loss, damage or

injury, howsoever caused, related to the use of Pico Technology equipment or

software, unless excluded by statute.

Fitness for purpose. As no two applications are the same, Pico Technology cannot

guarantee that its equipment or software is suitable for a given application. It is your

responsibility, therefore, to ensure that the product is suitable for your application.

Mission-critical applications. This software is intended for use on a computer that

may be running other software products. For this reason, one of the conditions of the

licence is that it excludes usage in mission-critical applications, such as life-support

systems.

Viruses. This software was continuously monitored for viruses during production, but

you are responsible for virus-checking the software once it is installed.

2.3 CE notice

The ADC-20 and ADC-24 meet the intent of EMC directive 89/336/EEC and meets the

EN61326-1 (1997) Class B Emissions and Immunity standard.

The ADC-20 and ADC-24 also meet the intent of the Low Voltage Directive and meet

the BS EN 61010-1:2001 IEC 61010-1:2001 (safety requirements for electrical equipment,

control, and laboratory use) standard.

A Declaration of Conformity is available from Pico Technology Ltd.

2.4 FCC notice

This equipment has been tested and found to comply with the limits for a Class A

digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to

provide reasonable protection against harmful interference when the equipment is

operated in a commercial environment. This equipment generates, uses, and can

radiate radio frequency energy and, if not installed and used in accordance with the

instruction manual, may cause harmful interference to radio communications.

Operation of this equipment in a residential area is likely to cause harmful interference

in which case the user will be required to correct the interference at his or her own

expense.

For safety and maintenance information see the safety warning.

A Declaration of Conformity is available from Pico Technology Ltd.

ADC-20/ADC-24 User's Guide 4

2.5 Trademarks

Pico Technology Limited and PicoLog are trademarks of Pico Technology Limited,

registered in the United Kingdom and other countries. Pico Technology acknowledges

the following product names as trademarks of their respective owners: Windows,

Excel, Visual Basic, LabVIEW, Delphi.

2.6 Updates

We provide upgrades, free of charge, from our web site. We reserve the right to

charge for updates or replacements sent out on physical media.

2.7 Support and refunds

If you are dissatisfied with the performance of this software, please contact our

technical support staff, who will try to fix the problem within a reasonable time. If you

are still dissatisfied, please return the product and software to your supplier within 14

days of purchase for a full refund.

2.8 Company details

Address:

Pico Technology

James House

Colmworth Business Park

St Neots

Cambridgeshire

PE19 8YP

United Kingdom

Phone: +44 (0)1480 396395

Fax: +44 (0)1480 396296

Email:

Technical Support: [email protected]

Sales: sal[email protected]

Web site: www.picotech.com

Getting started5

3 Getting started

3.1 Installing the software

Before you connect the ADC-20 or ADC-24 to your computer for the first time, you

must install the software supplied on the CD. Insert the Software and Reference CD,

then follow the "Install Software" link.

You may choose to install the driver when you install the PicoLog software, by ticking

the box labelled "32 Bit Drivers" during the installation procedure. Alternatively, you

can download the driver from our website at www.picotech.com.

3.2 Connecting the data logger

You must install the software before plugging in the data logger. When you have

installed the software, connect the data logger's USB cable to a spare USB port on

your computer.

The following instructions describe the installation procedure for Windows XP (SP3).

The procedure for Windows Vista and later operating systems is simpler: once the

software is correctly installed, just plug in the data logger and wait until Vista displays

the message "Device is ready to use".

When you first plug in the device, your computer should show this message:

and then display the New Hardware Found Wizard.

ADC-20/ADC-24 User's Guide 6

In the "Welcome to the New Hardware Found Wizard" dialog (above), click Next>.

Wait while the wizard installs the software.

A dialog will appear like the one below.

Click Continue Anyway.

Continue to wait while the wizard installs the software.

When instructed, click Finish to close the wizard.

After a few seconds you should see this message:

Your ADC-20 or ADC-24 Data Logger is now properly installed.

Getting started7

3.3 Starting PicoLog

To check that the data logger is working, start the PicoLog application as follows:

1. Start PicoLog. (Click the PicoLog icon: in your Windows Start

menu).

2. Click File.

3. Point to New settings.

4. At the Recording dialog, click OK.

5. At the Sampling Rate dialog, click OK.

ADC-20/ADC-24 User's Guide 8

6. In the Converter details dialog, set the Converter type to High Resolution

Data Logger. The device type and serial number should appear in the USB

Devices list, and the USB enumeration progress indicator should gradually

move towards 100%. If the progress indicator does not start moving, disconnect

and reconnect the unit and then press Refresh.

7. Click OK.

8. At the ADC-20 (or ADC-24)channels dialog, double-click on "Channel 1".

9. At the Edit ADC-20 (or ADC-24)Channel dialog, click OK.

Getting started9

10. Back at the ADC-20 (or ADC-24)Channels dialog, click OK.

11. The PLW Recorder view should now display the voltage on channel 1 (near 0 mV

if nothing connected).

12. Connect a suitable voltage (for example, from a 1.5 V battery) to the channel. Pin

connections are marked on the logger and also listed in the Analog connector

topic.

ADC-20/ADC-24 User's Guide 10

4 About the unit

4.1 Introduction

The ADC-20 and ADC-24 High-Resolution Data Loggers offer the ultimate in precise

and accurate readings. Features such as true differential inputs, galvanic isolation and

software-selectable sample rates all contribute to a superior noise-free resolution. The

ADC-20 is equipped with a 20-bit A/D converter, and can maintain a gain error of

0.2%. The four true differential inputs may be configured as eight single-ended inputs

or any combination in between, such as two differential and four single-ended. The

ADC-24 is equipped with a 24-bit A/D converter, and can maintain a gain error of

0.1%. The eight true differential inputs may be configured as 16 single-ended inputs

or any combination in between. Power and connection to a PC or laptop is through a

USB 1.1 or USB 2.0 port. Using the supplied PicoLog software, you can record, monitor

and analyze collected data, even exporting to third-party applications such as

Microsoft Excel.

About the unit11

4.2 Specifications

ADC-20

ADC-24

Input channels

Differential

Single-ended

Configurable up to 4

Configurable up to 8

Configurable up to 16

Conversion time per channel

60 ms, 100 ms, 180 ms, 340 ms, 660 ms

Input voltage ranges

2 ranges

±1250 mV and ±2500 mV

7 ranges

±39 mV to ±2500 mV

Resolution

20 bits

24 bits

Noise-free resolution

See table below

Overvoltage protection

±30 V between any input and common

Common-mode range

Channel to common

Common to earth ground

±1.9 V (±39 mV to ±1250 mV ranges)

±3.0 V (±2500 mV range)

±30 V

Common-mode rejection ratio

Channel to common

Common to earth ground

95 dB (DC to 60 Hz)

>125 dB (DC to 60 Hz)

Noise rejection

120 dB typical at 50 to 60 Hz

Input impedance

2 MΩ(differential), 1 MΩ(single-ended)

Gain error from source impedance

0.5 ppm per ohm source impedance

due to input impedance

Gain error

0.2%

0.1%

(0.2% at ±2500 mV)

Offset error

6 µV (±39 mV range)

7 µV (±78 mV range)

9 µV (±156 mV range)

13 µV (±313 mV range)

20 µV (±625 mV range)

36 µV (±1250 mV range)

400 µV (±2500 mV range)

Digital I/O

None

Output level, high

Output level, low

Input level, high

Input level, low

> 2.40 V

< 0.40 V

> 2.20 V

< 0.88 V

Isolation (input to input)

None

Isolation (input to ground)

Galvanic, up to ±30 V

AGND and DGND isolated

Reference output

+2.5 V ±2.5 mV @ 2 mA

Power outputs

+5 V ±1.0 V @ 2 mA

-5 V ±1.5 V @ 2 mA

Environmental conditions

Operating temperature

Quoted input accuracy

Storage temperature

Operating humidity

Storage humidity

0 ºC to 45 ºC

20 ºC to 30 ºC

-20 ºC to 60 ºC

5% to 80% RH, non-condensing

5% to 95% RH, non-condensing

Recommended calibration interval

1 year

PC connection

USB 1.1 (USB 2.0 compatible)

Cable length approx. 4.4 m (13.8 ft)

Input connector

DB25 female

Power supply

100 mA (max.) from USB port

Dimensions

13.5 cm x 18.4 cm x 3.6 cm

(5.31 in x 7.24 in x 1.41 in)

Weight

Approx. 505 g (17.8 oz)

ADC-20/ADC-24 User's Guide 12

4.3 Analog connector

Analog inputs are connected to the ADC-20 and ADC-24 through the female DB25

connector. The connections are as follows:

Function

Channel 2 (Channel 1-)

Channel 1

Channel 4 (Channel 3-)

Channel 3

Channel 6 (Channel 5-)

Channel 5

Channel 8 (Channel 7-)

Channel 7

Channel 10 (Channel 9-)

Channel 9

Channel 12 (Channel 11-)

Channel 11

Channel 14 (Channel 13-)

Channel 13

Channel 16 (Channel 15-)

Channel 15

Analog Ground

Digital Ground

+5 volts

Digital I/O 1

-5 volts

Digital I/O 2

+2.5 volts

Digital I/O 3

Digital I/O 4

Note 1: Channel numbers in brackets apply when the input is set to differential

mode.

Note 2: Channels 9 to 16 exist only on the ADC-24.

Note 3: Digital I/Os 1 to 4 exist only on the ADC-24.

Note 4: Pins 10 and 11 are low-current outputs for powering small sensors. Do

not exceed the current limits given in the Specifications table.

Note 5: The analog and digital grounds are not connected together inside the

unit. You should not connect them together externally, as this would

degrade the accuracy of the unit.

Note 6: For easy connection to the DB25 connector, we recommend that you

use the ADC-20/ADC-24 terminal board.

About the unit13

4.4 Noise-free resolution and conversion time

The table below shows the number of noise-free bits of resolution for the full range of

conversion times.

Conversion

time

per

channel

Voltage range

& Noise-free resolution (bits)

39 mV

78 mV

156 mV

313 mV

625 mV

±1250 mV

2500 mV

ADC-24 only

ADC-20 and ADC-24

660 ms

340 ms

180 ms

100 ms

60 ms

4.5 ADC-20/ADC-24 terminal board

For easy connection to the DB25 connector, we recommend that you use the

ADC-20/ADC-24 terminal board, part number PP310. This has screw terminals to

allow you to connect wires to all of the data logger's inputs and outputs without

soldering. It also has space for voltage-divider resistors, a temperature sensor and a

quad op-amp.

4.6 LED

The ADC-20 and ADC-24 have an LED, next to the entry point of the USB cable, that

you can use to verify that the unit is working. The LED flashes whenever the unit is

taking readings. It also flashes briefly during "enumeration", the process that PicoLog

uses to detect all Pico USB devices plugged in to the computer.

ADC-20/ADC-24 User's Guide 14

5 Programmer's reference

5.1 Recording methods

The ADC-20/ADC-24 driver provides three methods of recording data. All these

methods support USB 1.1.

Streaming

The driver constantly polls the device, and samples are placed in a buffer until

retrieved by your application. Precise sample timing is controlled by the unit.

Single Value (blocking)

You make a single request for a sample, blocking the calling thread, and when the

sample has been received the driver returns the value to your application.

Single Value (non-blocking)

You make a single request for a sample without blocking the calling thread, and

when the sample has been received the driver returns the value to your

application.

5.2 Windows driver

The SDK contains 32-bit and 64-bit drivers. Subdirectories called 'C console' and 'C

gui' contain example code.

PicoHRDL.dll is a Windows Dynamic Link Library (DLL), which can be used with C, C

++, Delphi, Visual Basic and National Instruments LabVIEW programs. It can also be

used with programs like Microsoft Excel, where the macro language is a form of Visual

Basic. More than one application can access the Windows DLL at the same time, as

long as the applications do not change the settings for channels that they are not

using. The driver supports all Windows operating systems from Windows XP onwards.

5.3 Scaling

To convert from ADC values to volts, first obtain the minimum and maximum ADC

values for the selected channel by calling the HRDLGetMinMaxAdcCounts function in

the driver. Next, scale the ADC value to the voltage range you specified when you

called HRDLSetAnalogInChannel. You can calculate the voltage range

programmatically by using

Vmax = 2500 mV / (2^r)

where ris the range constant you supplied to HRDLSetAnalogInChannel (0 for

±2500 mV, 1 for ±1250 mV and so on).

Programmer's reference15

5.4 Driver functions

The following sections describe the functions available to an application using the

ADC-20 and ADC-24. All functions are C functions using the standard call naming

convention (__stdcall) and are exported with both decorated and undecorated

names.

Function

Description

HRDLCloseUnit

Shuts down unit

HRDLCollectSingleValueAsync

Starts the unit sampling one value without

blocking the calling application's flow

HRDLGetMinMaxAdcCounts

Returns the maximum and minimum ADC count

available for the device

HRDLGetNumberOfEnabledChannels

Returns the number of analog channels enabled

HRDLGetSingleValue

Takes one sample for the specified channel at

the selected voltage range and conversion time

HRDLGetSingleValueAsync

Retrieves the reading when the

HRDLCollectSingleValueAsync has been called

HRDLGetTimesAndValues

Returns the requested number of time-stamped

samples for each enabled channel

HRDLGetUnitInfo

Writes unit information to a character string

HRDLGetValues

Returns the requested number of samples for

each enabled channel

HRDLOpenUnit

Opens data logger unit

HRDLOpenUnitAsync

Opens unit without blocking the calling thread

HRDLOpenUnitProgress

Checks the progress of an asynchronous open

operation

HRDLReady

Indicates when readings are ready to be

collected

HRDLRun

Starts the device sampling and storing the

samples into the driver's buffer

HRDLSetAnalogInChannel

Enables or disables the analog channel

HRDLSetDigitalIOChannel

Sets a digital output or input (ADC-24 only)

HRDLSetInterval

Sets the sampling time interval

HRDLSetMains

Sets the mains noise rejection frequency

HRDLStop

Stops the device when streaming

ADC-20/ADC-24 User's Guide 16

5.4.1 HRDLCloseUnit

short HRDLCloseUnit(

short handle )

Shuts down a data logger unit.

Arguments

handle

The handle, returned by HRDLOpenUnit, of the unit being closed

Returns

1 if a valid handle is passed

0 if not

Programmer's reference17

5.4.2 HRDLCollectSingleValueAsync

short HRDLCollectSingleValueAsync(

short handle,

short channel,

short range,

short conversionTime,

short singleEnded )

This function starts the unit sampling one value without blocking the calling

application's flow. Used in conjunction with HRDLGetSingleValueAsync and

HRDLReady.

Arguments

handle

Handle returned by HRDLOpenUnit

channel

Channel number to convert. If the channel is not valid then the

function will fail.

range

The voltage range to be used. If the range is not valid, the

function HRDLGetSingleValueAsync will return 0.

conversionTime

The time interval in which the sample should be converted. If the

conversion time is invalid,the function HRDLGetSingleValueAsync

will fail and return 0.

singleEnded

The type of voltage to be measured:

0: differential

nonzero: single-ended

Returns

1 if a valid handle is passed and the settings are correct

0 if not

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