1

1

Operating Manual

USB-based

Analog and Digital I/O Module

MODEL NO. 18200-00

The 18200-00 is a USB 1.1 low-speed device. It is designed for USB 1.1 ports, and was tested for full compatibility with both USB 1.1 and USB 2.0 ports.

The 18200-00 features eight analog inputs, two 10-bit analog outputs, 16 digital I/O connections, and one

32-bit external event counter. The 18200-00 is powered by the +5 volt USB supply from your computer.

No external power is required.

The 18200-00 analog inputs are software configurable for either eight 11-bit single-ended inputs, or four

12-bit differential inputs. An on-board industry standard 82C55 programmable peripheral interface chip provides the 16 digital I/O lines in two 8-bit ports. You can configure each digital port independently for either input or output.

Cole-Parmer Instrument Company

625 East Bunker Court

Vernon Hills, Illinois 60061-1844

(847) 549-7600

(847) 247-2929 (Fax)

800-323-4340 www.coleparmer.com

e-mail: [email protected]

Document Revision 1, May, 2006

© Copyright 2006 Measurement Computing Corporation, 1208LSR1

2

Table of Contents

Preface

About this Operating Manual...............................................................................................................5

What you will learn from this manual ................................................................................................................5

Conventions in this manual ................................................................................................................................5

Where to find more information .........................................................................................................................5

Chapter 1

Introducing the 18200-00......................................................................................................................6

18200-00 block diagram.....................................................................................................................................7

Software features ................................................................................................................................................7

Connecting a 18200-00 to your computer is easy...............................................................................................8

Chapter 2

Installing the 18200-00..........................................................................................................................9

What comes with your 18200-00 shipment? ......................................................................................................9

Hardware .......................................................................................................................................................................... 9

Additional documentation................................................................................................................................................. 9

Unpacking the 18200-00 ....................................................................................................................................9

Installing the software ......................................................................................................................................10

Installing the hardware .....................................................................................................................................10

Chapter 3

Functional Details ...............................................................................................................................11

Theory of operation - analog input acquisition modes .....................................................................................11

Software paced mode.......................................................................................................................................................11

Continuous scan mode .....................................................................................................................................................11

Burst scan mode...............................................................................................................................................................11

External components ........................................................................................................................................12

USB connector.................................................................................................................................................................12

LED .................................................................................................................................................................................12

Screw terminal wiring......................................................................................................................................................12

Main connector and pin out .............................................................................................................................................13

Analog input terminals (CH0 IN - CH7 IN).....................................................................................................................14

Digital I/O terminals (Port A0 to A7, and Port B0 to B7)................................................................................................17

Power terminals ...............................................................................................................................................................17

Ground terminals .............................................................................................................................................................18

Calibration terminal .........................................................................................................................................................18

Trigger terminal ...............................................................................................................................................................18

Counter terminal ..............................................................................................................................................................18

Accuracy...........................................................................................................................................................18

18200-00 channel gain queue feature ...............................................................................................................21

Chapter 4

Specifications......................................................................................................................................22

Analog input section.........................................................................................

Error! Bookmark not defined.

Analog output section.......................................................................................

Error! Bookmark not defined.

Digital input/output...........................................................................................

Error! Bookmark not defined.

External trigger.................................................................................................

Error! Bookmark not defined.

Counter section.................................................................................................

Error! Bookmark not defined.

Non-volatile memory........................................................................................

Error! Bookmark not defined.

Power................................................................................................................

Error! Bookmark not defined.

General .............................................................................................................

Error! Bookmark not defined.

3

18200-00 Operating Manual

Environmental ..................................................................................................

Error! Bookmark not defined.

Mechanical .......................................................................................................

Error! Bookmark not defined.

Main connector and pin out ..............................................................................

Error! Bookmark not defined.

4-channel differential mode .............................................................................................

Error! Bookmark not defined.

8-channel single-ended mode...........................................................................................

Error! Bookmark not defined.

4

Preface

About this Operating Manual

What you will learn from this manual

This manual explains how to install, configure, and use the 18200-00 so that you get the most out of its temperature measurement and data logging features.

This manual also refers you to related documents available on our web site, and to technical support resources.

Conventions in this manual

For more information on …

Text presented in a box signifies additional information and helpful hints related to the subject matter you are reading.

Caution!

Shaded caution statements present information to help you avoid injuring yourself and others, damaging your hardware, or losing your data.

<

#

:

#

>

bold

text

italic

text

Angle brackets that enclose numbers separated by a colon signify a range of numbers, such as those assigned to registers, bit settings, etc.

Bold

text is used for the names of objects on the screen, such as buttons, text boxes, and check boxes. For example:

1.

Insert the disk or CD and click the

OK

button.

Italic

text is used for the names of manuals and help topic titles, and to emphasize a word or phrase. For example:

The

Insta

Cal® installation procedure is explained in the

Quick Start Guide

.

Never

touch the exposed pins or circuit connections on the board

Where to find more information

The following electronic documents provide helpful information relevant to the operation of the 18200-00.

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Cole-Parmer's

Specifications: 18200-00

(the PDF version of the Electrical Specification Chapter in this guide) is available on our web site at www.coleparmer.com/catalog/MoreInfo/18200-00-spec.pdf

.

Cole-Parmer's

Quick Start Guide

is available on our web site at www.coleparmer.com/catalog/MoreInfo/CP-Quick-Start.pdf

.

Cole-Parmer's

Guide to Signal Connections

is available on our web site at www.coleparmer.com/catalog/MoreInfo/CPsignals.pdf

.

Cole-Parmer's

Universal Library User's Guide

is available on our web site at www.coleparmer.com/catalog/MoreInfo/sm-ul-user-guide.pdf

.

Cole-Parmer's

Universal Library Function Reference

is available on our web site at www.coleparmer.com/catalog/MoreInfo/sm-ul-functions.pdf

.

Cole-Parmer's

Universal Library for LabVIEW

User’s Guide

is available on our web site at www.coleparmer.com/catalog/MoreInfo/SM-UL-LabVIEW.pdf

.

18200-00 Operating Manual

(this document) is also available on our web site at www.coleparmer.com/cpusbdaq1/18200-00.pdf

.

5

Chapter 1

Introducing the 18200-00

This manual contains all of the information you need to connect the 18200-00 to your computer and to the signals you want to measure. The 18200-00 is part of the Cole-Parmer brand of USB-based data acquisition products.

The 18200-00 is a USB 1.1 low-speed device supported under popular Microsoft ports.

®

Windows

®

operating systems. It is designed for USB 1.1 ports, and was tested for full compatibility with both USB 1.1 and USB 2.0

Refer to the "

Be sure you are using the latest system software

" note in Chapter 2, "Installing the 18200-00," to

make sure you are using the latest USB drivers.

The 18200-00 features eight analog inputs, two 10-bit analog outputs, 16 digital I/O connections, and one 32-bit external event counter. The 18200-00 is powered by the +5 volt USB supply from your computer. No external power is required.

The 18200-00 analog inputs are software configurable for either eight 11-bit single-ended inputs, or four 12-bit differential inputs. An on-board industry standard 82C55 programmable peripheral interface chip provides the

16 digital I/O lines in two 8-bit ports. You can configure each digital port independently for either input or output.

The 18200-00 is shown in Figure 1-1. I/O connections are made to the screw terminals located along each side

of the 18200-00.

Figure 1-1. 18200-00

6

18200-00 Operating Manual Introducing the 18200-00

18200-00 block diagram

18200-00 functions are illustrated in the block diagram shown here.

USB1.1

Compliant

Interface

Analog Input

8 SE ( 11-bit ) channels or

4 Diff. ( 12-bit ) channels

8

USB

Microcontroller

Analog Output

10-bit

2 channels

2

82C55 DIO

Port

A

Port

B

8 8

Screw terminal I/O connector

32-bit

Event Counter

1 channel

Figure 1-2. 18200-00 functional block diagram

1

Software features

For information on the features of

Insta

Cal and the other software included with your 18200-00, refer to the

Quick Start Guide

that shipped with your device. The

Quick Start Guide

is also available in PDF at www.coleparmer.com/catalog/MoreInfo/CP-Quick-Start.pdf

.

7

18200-00 Operating Manual Introducing the 18200-00

Connecting a 18200-00 to your computer is easy

Installing a data acquisition device has never been easier.

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The 18200-00 relies upon the Microsoft Human Interface Device (HID) class drivers. The HID class drivers ship with every copy of Windows that is designed to work with USB ports. We use the Microsoft

HID because it is a standard, and its performance delivers full control and maximizes data transfer rates for your 18200-00. No third-party device driver is required.

The 18200-00 is plug-and-play. There are no jumpers to position, DIP switches to set, or interrupts to configure.

You can connect the 18200-00 before or after you install the software, and without powering down your computer first. When you connect an HID to your system, your computer automatically detects it and configures the necessary software. You can connect and power multiple HID peripherals to your system using a USB hub.

You can connect your system to various devices using a standard four-wire cable. The USB connector replaces the serial and parallel port connectors with one standardized plug and port combination.

You do not need a separate power supply module. The USB automatically delivers the electrical power required by each peripheral connected to your system.

Data can flow two ways between a computer and peripheral over USB connections.

8

Installing the 18200-00

What comes with your 18200-00 shipment?

As you unpack your 18200-00, verify that the following components are included.

Hardware

ƒ 18200-00

Chapter 2

ƒ USB cable (2 meter length)

Additional documentation

In addition to this hardware manual, you should also receive the

Quick Start Guide

(available in PDF at www.coleparmer.com/catalog/MoreInfo/CP-Quick-Start.pdf

.). This booklet supplies a brief description of the software you received with your 18200-80 and information regarding installation of that software. Please read this booklet completely before installing any software or hardware.

Unpacking the 18200-00

As with any electronic device, you should take care while handling to avoid damage from static electricity. Before removing the 18200-00 from its packaging, ground yourself using a wrist strap or by simply touching the computer chassis or other grounded object to eliminate any stored static charge.

If your 18200-00 is damaged, notify Cole-Parmer immediately by phone, fax, or email:

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Phone: 800-323-4340.

Fax: 847-247-2929

Email: [email protected]

9

18200-00 Operating Manual Installing the 18200-00

Installing the software

Refer to the

Quick Start Guide

for instructions on installing the software on the

C-P Data Acquisition Software

CD

. This booklet is available in PDF at www.coleparmer.com/catalog/MoreInfo/CP-Quick-Start.pdf

.

Installing the hardware

Be sure you are using the latest system software

Before you connect the 18200-00, make sure that you are using the latest versions of the USB drivers.

Before installing the 18200-00, download and install the latest Microsoft Windows updates. In particular, when using Windows XP, make sure you have XP Hotfix KB822603 installed. This update is intended to address a serious error in Usbport.sys when you operate a USB device. You can run Windows Update or download the update from www.microsoft.com/downloads/details.aspx?familyid=733dd867-56a0-4956-b7fee85b688b7f86&displaylang=en . For more information, refer to the Microsoft Knowledge Base article

"

Availability of the Windows XP SP1 USB 1

.

1 and 2

.

0 update.

" This article is available at support.microsoft.com/?kbid=822603 .

To connect the 18200-00 to your system, turn your computer on, and connect the USB cable to a USB port on your computer or to an external USB hub that is connected to your computer. The USB cable provides power and communication to the 18200-00.

When you connect the 18200-00 for the first time, a

Found New Hardware

popup balloon (Windows XP) or dialog (other Windows versions) opens as the 18200-00 is detected by your computer.

Another

Found New Hardware

balloon or dialog opens after the first closes that identifies the 18200-00 as a

USB Human Interface Device.

When this balloon or dialog closes, the installation is complete. The LED on the 18200-00 should flash and then remain lit. This indicates that communication is established between the 18200-00 and your computer.

Caution!

Do not disconnect

any

device from the USB bus while the computer is communicating with the

18200-00, or you may lose data and/or your ability to communicate with the 18200-00.

If the LED turns off

If the LED is illuminated but then turns off, the computer has lost communication with the 18200-00. To restore communication, disconnect the USB cable from the computer, and then reconnect it. This should restore communication, and the LED should turn back

on

.

10

Chapter 3

Functional Details

Theory of operation - analog input acquisition modes

The 18200-00 can acquire analog input data in three different modes – software paced, continuous scan, and burst scan.

Software paced mode

In software paced mode, you can acquire one analog sample at a time. You initiate the A/D conversion by calling a software command. The analog value is converted to digital and returned to the computer. You can repeat this procedure until you have the total number of samples that you want from one channel.

Software pacing is limited by the 20 mS round-trip requirement of a USB interrupt-type endpoint operation.

The maximum throughput sample rate in software paced mode is 50 S/s.

Continuous scan mode

In continuous scan mode, you can acquire data from up to eight channels. The analog data is continuously acquired, converted to digital values, and written to an on-board FIFO buffer until you stop the scan. The FIFO buffer is serviced in blocks as the data is transferred from the 18200-00 to the memory buffer on your computer.

The maximum continuous scan rate of 1.2 kS/s is an aggregate rate. The total acquisition rate for all channels cannot exceed 1.2 kS/s. You can acquire data from one channel at 1.2 kS/s, two channels at 600 S/s and four channels at 300 S/s. You can start a continuous scan with either a software command or with an external hardware trigger event.

Burst scan mode

In burst scan mode, you can acquire data using the full capacity of the 18200-00 4 k sample FIFO. You can initiate a single acquisition sequence of up to 4096 samples channels by either a software command or an external hardware trigger. The captured data is then read from the FIFO and transferred to a user buffer in the host PC.

Burst scans are limited to the depth of the on-board memory, as the data is acquired at a rate faster than it can be transferred to the computer. The maximum sampling rate is an aggregate rate. The maximum rates that you can acquire data using burst scan mode is 8 kS/s divided by the number of channels in the scan.

11

18200-00 Operating Manual

External components

The 18200-00 has the following external components, as shown in Figure 3-1.

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USB connector

LED

Screw terminal banks (2)

Screw terminals

Pins 1-20

LED

Functional Details

Screw terminals

Pins 21-40

USB connector/cable

Figure 3-1. 18200-00 external components

USB connector

The USB connector is on the right side of the 18200-00 housing. This connector provides +5V power and communication. The voltage supplied through the USB connector is system-dependent, and may be less than

5V. No external power supply is required.

LED

The LED on the front of the housing indicates the communication status of the 18200-00. It uses up to 5 mA of

current and cannot be disabled. Table 3-1 defines the function of the 18200-00 LED.

When the LED is…

Steady green

Blinks continuously

Blinks three times

Blinks at a slow rate

Table 3-1. LED illumination

It indicates…

The 18200-00 is connected to a computer or external USB hub.

Data is being transferred.

Initial communication is established between the 18200-00 and the computer.

The analog input is configured for external trigger. The LED stops blinking and illuminates steady green when the trigger is received.

Screw terminal wiring

The 18200-00 has two rows of screw terminals—one row on the top edge of the housing, and one row on the

bottom edge. Each row has 20 connections. Pin numbers are identified in Figure 3-2.

12

18200-00 Operating Manual Functional Details

Figure 3-2. 18200-00 Screw terminal pin numbers

Screw terminal – pins 1-20

The screw terminals on the top edge of the 18200-00 (pins 1 to 20) provide the following connections:

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Eight analog input connections (

Two analog output connections (

One external trigger source (

Screw terminal – pins 21-40

D/A OUT 0

TRIG_IN

)

to

One external event counter connection (

CTR

)

Seven GND connections (

GND

)

One calibration terminal (

CAL

)

CH0 IN

to

CH7 IN

)

D/A OUT 1

)

The screw terminals on the bottom edge of the (pins 21 to 40) provide the following connections:

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16 digital I/O connections (

One power connection (

Three ground connections (

PortA0

PC+5 V

GND

)

)

to

Port A7

, and

Port B0

to

Port B7

)

Main connector and pin out

Connector type

Wire gauge range

Screw terminal

16 AWG to 30 AWG

13

18200-00 Operating Manual

11 10 9G

Functional Details

4-channel differential mode pin out

8-channel single-ended mode pin out

Analog input terminals (CH0 IN - CH7 IN)

You can connect up to eight analog input connections to the screw terminal containing pins 1 to 20 (

CH0 IN

through

CH7 IN

). Refer to the pinout diagrams

above for the location of these pins.

You can configure the analog input channels as eight single-ended channels or four differential channels. When configured for differential mode, each analog input has 12-bit resolution. When configured for single-ended mode, each analog input has 11-bit resolution, due to restrictions imposed by the A/D converter.

Single-ended configuration

When all of the analog input channels are configured for single-ended input mode, eight analog channels are available. The input signal is referenced to signal ground (GND), and delivered through two wires:

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The wire carrying the signal to be measured connects to CH# IN.

The second wire connects to GND.

The input range for single-ended mode is ±10V. No other ranges are supported in single-ended mode. Figure

3-3 illustrates a typical single-ended measurement connection.

Figure 3-3. Single-ended measurement connection

14

18200-00 Operating Manual Functional Details

Single-ended measurements using differential channels

To perform a single-ended measurement using differential channels, connect the signal to "CH

n

IN HI" input, and ground the associated "CH

n

IN LO" input.

Differential configuration

When all of the analog input channels are configured for differential input mode, four analog channels are available. In differential mode, the input signal is measured with respect to the low input.

The input signal is delivered through three wires:

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The wire carrying the signal to be measured connects to CH0 IN HI, CH1 IN HI, CH2 IN HI, or

CH3 IN HI.

The wire carrying the reference signal connects to CH0 IN LO, CH1 IN LO, CH2 IN LO, or CH3 IN LO.

The third wire connects to GND.

A low-noise precision programmable gain amplifier (PGA) is available on differential channels to provide gains of up to 20 and a dynamic range of up to 12-bits. Differential mode input voltage ranges are ±20 V, ±10 V,

±5 V, ±4 V, ±2.5 V, ±2.0 V, 1.25 V, and ±1.0 V.

In differential mode, the following two requirements must be met for linear operation:

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Any analog input must remain in the range.

− 10V to +20V range with respect to ground at all times.

The maximum differential voltage on any given analog input pair must remain within the selected voltage

The input [

common

-

mode voltage

+

signal

] of the differential channel must be in the

− 10 V to +20 V range in order to yield a useful result. For example, you input a 4 V pp sine wave to CHHI, and apply the same sine wave 180° out of phase to CHLO. The common mode voltage is 0 V. The differential input voltage swings from 4 V

-

(-4 V) = 8 V to -4 V

-

4 V = -8V. Both inputs satisfy the -10 V to +20 V input range

requirement, and the differential voltage is suited for the ±10 V input range (see Figure 3-4).

+4V

Measured Signal

CHHI

0V

-4V

8V Differential

+/-8V

+4V

CHLO

-4V

Figure 3-4. Differential Voltage Example: Common Mode Voltage of 0 V

If you increase the common mode voltage to 11 V, the differential remains at ±8 V. Although the [

common

-

mode voltage

+

signal

] on each input now has a range of +7 V to +15 V, both inputs still satisfy the -10 V to

+20 V input requirement (see Figure 3-5).

15

18200-00 Operating Manual

CHHI

+15V

+11V

Measured Signal

Functional Details

8V Differential

+/-8V

CHLO

+11V

+7V

Figure 3-5. Differential Voltage Example: Common Mode Voltage of 11V

If you decrease the common-mode voltage to -7 V, the differential stays at ±8 V. However, the solution now violates the input range condition of -10 V to +20 V. The voltage on each analog input now swings from -3V to

-11V. Voltages between -10 V and -3 V are resolved, but those below -10 V are clipped (see Figure 3-6).

CHHI

-3V

-7V

3V

-11V

Measured Signal

8V Differential

+/-7V

CHLO

-3V

-7V

-11V

Figure 3-6. Differential Voltage Example: Common Mode Voltage of -7 V

Since the analog inputs are restricted to a − 10 V to +20 V signal swing with respect to ground, all ranges

except

±20V can realize a linear output for any differential signal with zero common mode voltage and full scale signal inputs. The ±20 V range is the exception. You cannot put − 20 V on CHHI and 0 V on CHLO since this violates the input range criteria.

Table 3-2 shows some possible inputs and the expected results.

Table 3-2. Sample Inputs and Differential Results

CHHI CHLO Result

-20 V

-15 V

-10 V

-10 V

0 V

0 V

+10 V

+10 V

+15 V

+20 V

0 V

+5 V

0 V

+10 V

+10 V

+20 V

-10 V

0 V

-5 V

0

Invalid

Invalid

-10 V

-20 V

-10 V

-20 V

+20 V

+10 V

+20 V

+20 V

For more information on analog signal connections

For more information on single-ended and differential inputs, refer to the

Guide to Signal Connections

(this document is available on our web site at www.coleparmer.com/catalog/MoreInfo/CPsignals.pdf

.)

16

18200-00 Operating Manual Functional Details

Digital I/O terminals (Port A0 to A7, and Port B0 to B7)

You can connect up to 16 digital I/O lines to the screw terminal containing pins 21 to 40 (

Port A0

to

Port A7

, and

Port B0

to

Port B7

.) Refer to the pinout diagrams

on page 14 for the location of these pins. You can

configure each digital port for either input or output.

When you configure the digital bits for input, you can use the digital I/O terminals to detect the state of any

TTL level input. Refer to the switch shown in Figure 3-7 and the schematic shown in Figure 3-8. If the switch is

set to the +5 V input, Port A0 reads

TRUE

(1). If you move the switch to GND, Port A0 reads

FALSE

.

Figure 3-7. Digital connection Port A0 detecting the state of a switch

Port A0

+GND +5V

Figure 3-8. Schematic showing switch detection by digital channel Port A0

For more information on digital signal connections

For more information on digital signal connections and digital I/O techniques, refer to the

Guide to Signal

Connections

(available on our web site at www.coleparmer.com/catalog/MoreInfo/CPsignals.pdf

.)

Power terminals

The

PC +5 V

connection (pin 30) is on the bottom screw terminal of the 18200-00. Refer to the pinout diagrams

on page 14 for the location of this pin. This terminal draws power from the USB connector. The +5 V screw

terminal is a 5 volt output that is supplied by the host computer.

Caution!

The +5V terminal is an output. Do not connect to an external power supply or you may damage the 18200-00 and possibly the computer.

The maximum total output current that can be drawn from all 18200-00 connections (power, analog and digital outputs) is 500 mA. This maximum applies to most personal computers and self-powered USB hubs.

Bus-powered hubs and notebook computers may limit the maximum available output current to 100 mA.

Just connecting the 18200-00 to your computer draws 20 mA of current from the USB +5 V supply. Once you start running applications with the 18200-00, each DIO bit can draw up to 2.5 mA, and each analog output can

17

18200-00 Operating Manual Functional Details

draw 30 mA. The maximum amount of +5 V current available for experimental use, over and above that required by the 18200-00, is the difference between the

total current requirement

of the USB device (based on the application), and the

allowed current draw

of the PC platform (500 mA for desktop PCs and self-powered hubs, or 100 mA for bus-powered hubs and notebook computers).

With all outputs at their maximum output current, you can calculate the total current requirement of the 18200-

00 USB +5 V as follows:

(18200-00 @ 20 mA) + (16 DIO @ 2.5 mA ea) + (2 AO @ 30 mA ea ) = 120 mA

For an application running on a PC or powered hub, the maximum available excess current is 500 mA − 120 mA

= 380 mA. This number is the total maximum available current at the PC+5V screw terminals. Measurement

Computing highly recommends that you figure in a safety factor of 20% below this maximum current loading for your applications. A conservative, safe user maximum in this case would be in the 300-320 mA range.

Since laptop computers typically allow up to 100 mA, the 18200-00 in a fully-loaded configuration may be above that allowed by the computer. In this case, you must determine the per-pin loading in the application to ensure that the maximum loading criteria is met. The per-pin loading is calculated by simply dividing the +5 V by the load impedance of the pin in question.

Ground terminals

The 10 ground connections (

GND

) are identical, and provide a common ground for all 18200-00 functions.

Refer to the pinout diagrams

on page 14 for the location of the

GND

terminal pins.

Calibration terminal

The

CAL

connection (pin 16) is an output you should use only to calibrate the 18200-00. Refer to the pinout diagrams

on page 14 for the location of this pin. Calibration of the 18200-00 is software-controlled via

Insta

Cal.

Trigger terminal

The

TRIG_IN

connection (pin 18) is an external digital trigger input. You can configure this terminal with software for either trigger high or trigger low.

Counter terminal

The

CTR

connection (Pin 20) is input to the 32-bit external event. Refer to the pinout diagrams

on page 14 for

the location of this pin. The internal counter increments when the TTL levels transition from low to high. The counter can count frequencies of up to 1 MHz.

Accuracy

The overall accuracy of any instrument is limited by the error components within the system. Quite often, resolution is incorrectly used to quantify the performance of a measurement product. While "12-bits" or "1 part in 4096" does indicate what can be resolved, it provides little insight into the quality of an absolute measurement. Accuracy specifications describe the actual results that can be realized with a measurement device.

There are three types of errors which affect the accuracy of a measurement system:

ƒ

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ƒ offset gain nonlinearity.

18

18200-00 Operating Manual Functional Details

The primary error sources in the 18200-00 are offset and gain. Nonlinearity is small in the 18200-00, and is not significant as an error source with respect to offset and gain.

Figure 3-9 shows an ideal, error-free, 18200-00 transfer function. The typical calibrated accuracy of the 18200-

00 is range-dependent, as explained in the " Specifications " chapter of this document. We use a ±10 V range here as an example of what you can expect when performing a measurement in this range.

Input Voltage

+ FS

0

2048 4095

Output Code

-FS

Figure 3-9. Ideal ADC transfer function

The 18200-00 offset error is measured at mid-scale. Ideally, a zero volt input should produce an output code of

2048. Any deviation from this is an offset error. Figure 3-10 shows the 18200-00 transfer function with an

offset error. The typical offset error specification on the ±10 V range is ±9.77 mV. Offset error affects all codes equally by shifting the entire transfer function up or down along the input voltage axis.

The accuracy plots in Figure 3-10 are drawn for clarity and are not drawn to scale.

Input Voltage

+ FS

Ideal

Offset= 9.77mV

2

0

Actual

2048

9.77mV

4095

Output Code

-FS

Figure 3-10. ADC transfer function with offset error

19

18200-00 Operating Manual Functional Details

Gain error is a change in the slope of the transfer function from the ideal, and is typically expressed as a

percentage of full-scale. Figure 3-11 shows the 18200-00 transfer function with gain error. Gain error is easily

converted to voltage by multiplying the full-scale (

FS

) input by the error.

The accuracy plots in Figure 3-11 are drawn for clarity and are not drawn to scale.

Input Voltage

+ FS

Ideal

Gain error= + 0.2%, or + 20 mV

Gain error= -0.2%, or -20 mV

Actual

0

2048

4095

Output Code

-FS

Figure 3-11. ADC Transfer function with gain error

For example, the 18200-00 exhibits a typical calibrated gain error of ±0.2% on all ranges. For the ±10 V range, this would yield 10 V × ±0.002 = ±20 mV. This means that at full scale, neglecting the effect of offset for the moment, the measurement would be within 20 mV of the actual value. Note that gain error is expressed as a ratio. Values near ±FS are more affected from an absolute voltage standpoint than are values near mid-scale, which see little or no voltage error.

Combining these two error sources in Figure 3-12, we have a plot of the error band of the 18200-00 for the

±10 V range. This is a graphical version of the typical accuracy specification of the product.

The accuracy plots in Figure 3-12 are drawn for clarity and are not drawn to scale

Input Voltage

+ FS

Ideal

Ideal -(9.77mV + 20 mV)

0

9.77mV

2048 4095

Output Code

Ideal + 9.77mV + 20 mV

Ideal

Ideal -(9.77mV + 20 mV)

-FS

Figure 3-12. Error band plot

20

18200-00 Operating Manual Functional Details

18200-00 channel gain queue feature

The 18200-00's channel gain queue feature allows you to set up a scan sequence with a unique per-channel gain setting and channel sequence.

The channel gain queue feature removes the restriction of using an ascending channel sequence at a fixed gain.

This feature creates a channel list which is written to local memory on the 18200-00. The channel list is made

up of a channel number and range setting. An example of a four-element list is shown in Table 3-3.

Table 3-3. Sample channel gain queue list

Element

0

1

2

3

Channel

CH0

CH0

CH7

CH2

Range

BIP10V

BIP5V

BIP10V

BIP1V

When a scan begins with the gain queue enabled, the 18200-00 reads the first element, sets the appropriate channel number and range, and then acquires a sample. The properties of the next element are then retrieved, and another sample is acquired. This sequence continues until all elements in the gain queue have been selected.

When the end of the channel list is detected, the sequence returns to the first element in the list.

This sequence repeats until the specified number of samples is gathered. You must carefully match the gain to the expected voltage range on the associated channel — otherwise, an over range condition can occur. Although this condition does not damage the 18200-00, it does produce a useless full-scale reading. It can also introduce a long recovery time from saturation, which can affect the next measurement in the queue.

21

Chapter 4

Specifications

Typical for 25°C unless otherwise specified.

Specifications in

italic text

are guaranteed by design.

Analog input

A/D converter type

Input voltage range for linear operation, single-ended mode

Input common-mode voltage range for linear operation, differential mode

Absolute maximum input voltage

Input current (Note 1)

Input impedance

Number of channels

Input ranges, single-ended mode

Input ranges, differential mode

CHx to GND

CHx to GND

CHx to GND

Vin = +10 V

Vin = 0V

Vin = -10 V

Successive approximation type

±10 V max

-10 V min, +20 V max

±40V max

70µA typ

-12µA typ

-94µA typ

122K Ohms

8 single ended / 4 differential, software selectable

±10V, G=2

±20V, G=1

±10V, G=2

±5V, G=4

±4V, G=5

±2.5V, G=8

±2.0V, G=10

±1.25V, G=16

±1.0V, G=20

Software selectable

50 S/s

1.2 kS/s

8 kS/s

Throughput

CAL accuracy

Integral linearity error

Differential linearity error

Repeatability

CAL current

Software paced

Continuous scan

Burst scan to 4 K sample

FIFO

Up to 8 elements Channel gain queue

Resolution (Note 2) Differential

Single ended

CAL = 2.5V

Source

Sink

Software configurable channel, range, and gain.

12 bits, no missing codes

11 bits

±0.05% typ, ±0.25% max

±1 LSB typ

±0.5 LSB typ

±1 LSB typ

5 mA max

20 µA min, 200 nA typ

Trigger Source

Note 1:

Input current is a function of applied voltage on the analog input channels. For a given input voltage, Vin, the input leakage is approximately equal to (8.181*Vin-12) µA.

Note 2:

The AD7870 converter only returns 11-bits (0-2047 codes) in single-ended mode.

22

18200-00 Operating Manual Specifications

Table 1. Accuracy, differential mode

±20 V

±10 V

±5 V

±4 V

±2.5 V

±2 V

±1.25 V

±1 V

5.1

6.1

8.1

9.1

12.1

14.1

20.1

24.1

Table 2. Accuracy, single-ended mode

±10 V

Range

±20 V

±10 V

±5 V

±4 V

±2.5 V

±2 V

±1.25 V

±1 V

Range

±10 V

Analog output

4.0

Table 3. Accuracy components, differential mode - all values are (±)

% of Reading Gain Error at FS

(mV)

0.2 40

0.2 20

0.2 10

0.2 8

0.2 5

0.2 4

0.2

0.2

2.5

2

Offset (mV) Accuracy at FS (mV)

9.766 49.766

9.766 29.766

9.766 19.766

9.766 17.766

9.766 14.766

9.766 13.766

9.766 12.266

9.766 11.766

Table 4. Accuracy components, single-ended mode - all values are (±)

% of Reading Gain Error at FS

(mV)

0.2 20

Offset (mV) Accuracy at FS (mV)

19.531 39.531

D/A converter type

Resolution

Maximum output range

Number of channels

PWM

10-bits, 1 in 1024

0 -5 Volts

2 voltage output

Power on and reset voltage

Maximum voltage (Note 3)

Output drive

Slew rate

No load

1 mA load

5 mA load

Each D/A OUT

50 S/s dual channel mode

Initializes to 000h code

Vs

0.99 * Vs

0.98 * Vs

30 mA

0.14 V/mS typ

Note 3:

Vs is the USB bus +5V power. The maximum analog output voltage is equal to Vs at no-load.

V is system dependent and may be less than 5 volts.

23

18200-00 Operating Manual Specifications

Digital input/output

Digital type

Number of I/O

Configuration

Pull up/pull-down configuration

Input high voltage

Input low voltage

Output high voltage (IOH = -2.5 mA)

Output low voltage (IOL = 2.5 mA)

External trigger

82C55

16 (Port A0 through A7, Port B0 through B7

2 banks of 8

All pins pulled up to Vs via 47K resistors (default). Positions available for pull down to ground. Hardware selectable via zero ohm resistors as a factory option.

2.0 V min, 5.5 V absolute max

0.8 V max, –0.5 V absolute min

3.0 V min

0.4 V max

Trigger source (Note 4)

Trigger mode

External digital

Software selectable

Trigger latency

Trigger pulse width

Input high voltage

Input low voltage

Input leakage current

Note 4:

Burst

Burst

TRIG_IN is protected with a 1.5KOhm series resistor.

Counter

Counter type

Number of channels

Input source

Input type

Schmidt trigger hysteresis

Input leakage current

Maximum input frequency

High pulse width

Low pulse width

Input low voltage

Input high voltage

Non-volatile memory

Memory size

Memory configuration

8192 bytes

Address Range

0x0000 – 0x17FF

0x1800 – 0x1EFF

0x1F00 – 0x1FEF

0x1FF0 – 0x1FFF

Event counter

1

CTR screw terminal

TTL, rising edge triggered

20 mV to 100 mV

±1 µA

1 MHz

500 ns min

500 ns min

0 V min, 1.0 V max

4.0 V min, 15.0 V max

Access

Read/Write

Read/Write

Read/Write

Read/Write

TRIG_IN

Level sensitive: user configurable for

TTL level high or low input.

25 µs min, 50 µs max

40 µs min

3.0 V min, 15.0 V absolute max

0.8 V max

±1.0 µA

Description

A/D data (4K samples)

User data area

Calibration data

System data

24

18200-00 Operating Manual Specifications

Power

Supply current (Note 5)

+5V USB power available (Note 6)

Output current (Note 7)

Connected to Self-Powered Hub

Connected to Bus-Powered Hub

Connected to Self-Powered Hub

Connected to Bus-Powered Hub

20 mA

4.5 V min, 5.25 V max

4.1 V min, 5.25 V max

450 mA min, 500 mA max

50 mA min, 100 mA max

Note 5:

This is the total current requirement for the 18200-00 which includes up to 5mA for the status

LED.

Note 6:

Self-powered refers to USB hubs and hosts with a power supply. Bus-powered refers to USB hubs and hosts without their own power supply.

Note 7:

This refers to the total amount of current that can be sourced from the USB +5V, analog outputs and digital outputs.

General

USB controller clock error

Device type

Device compatibility

25 °C

0 to 70 °C

±30 ppm max

±50 ppm max

USB 1.1 low-speed

USB 1.1, USB 2.0

Environmental

Operating temperature range

Storage temperature range

Humidity

-

0 to 70 °C

-40 to 70 °C

0 to 90% non-condensing

Mechanical

Dimensions

USB cable length

User connection length

79 mm (L) x 82 mm (W) x 25 mm (H)

3 Meters max

3 Meters max

Main connector and pin out

Connector type

Wire gauge range

Screw terminal

16 AWG to 30 AWG

25

18200-00 Operating Manual

4-channel differential mode

Pin Signal Name

1

2

CH0 IN HI

CH0 IN LO

3 GND

4 CH1 IN HI

5 CH1 IN LO

6 GND

7

8

CH2 IN HI

CH2 IN LO

9 GND

10

11

CH3 IN HI

CH3 IN LO

12 GND

13 D/A OUT 0

14 D/A OUT 1

15 GND

16 CAL

17 GND

18 TRIG_IN

19 GND

20 CTR

8-channel single-ended mode

Pin Signal Name

1

2

CH0 IN

CH1 IN

3 GND

4

5

CH2 IN

CH3 IN

6 GND

7 CH4 IN

8 CH5 IN

9 GND

12 GND

13 D/A OUT 0

14 D/A OUT 1

15 GND

16 CAL

17 GND

18 TRIG_IN

19 GND

20 CTR

Pin

21

22

Signal Name

Port A0

Port A1

24

25

Port A3

Port A4

27

28

Port A6

Port A7

29 GND

30

31

PC+5V

GND

33

34

Port B1

Port B2

40 GND

Pin

21

22

Signal Name

Port A0

Port A1

24

25

Port A3

Port A4

27

28

Port A6

Port A7

29 GND

30 PC+5V

31 GND

33

34

Port B1

Port B2

40 GND

Specifications

26

Declaration of Conformity

Manufacturer: Measurement Computing Corporation

Address: 16 Commerce Boulevard

Middleboro, MA 02346

USA

Category: Electrical equipment for measurement, control and laboratory use.

Measurement Computing Corporation declares under sole responsibility that the product

18200-00

to which this declaration relates is in conformity with the relevant provisions of the following standards or other documents:

EU EMC Directive 89/336/EEC: Electromagnetic Compatibility, EN 61326 (1997) Amendment 1 (1998)

Emissions: Group 1, Class B

ƒ EN 55011 (1990)/CISPR 11: Radiated and Conducted emissions.

Immunity: EN61326, Annex A

ƒ

ƒ

ƒ

IEC 1000-4-2 (1995): Electrostatic Discharge immunity, Criteria A.

IEC 1000-4-3 (1995): Radiated Electromagnetic Field immunity Criteria A.

IEC 1000-4-8 (1994): Power Frequency Magnetic Field immunity Criteria A.

Declaration of Conformity based on tests conducted by Chomerics Test Services, Woburn, MA 01801, USA in

May, 2004. Test records are outlined in Chomerics Test Report #EMI3733.04.

We hereby declare that the equipment specified conforms to the above Directives and Standards.

Carl Haapaoja, Director of Quality Assurance

HM 18200-00.doc

Cole-Parmer Instrument Company

625 East Bunker Court

Vernon Hills, Illinois 60061-1844

(847) 549-7600

Fax: (847) 247-2929 (Fax)

800-323-4340

www.coleparmer.com

E-mail:

[email protected]

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