PICO -2000 Manual de usuario

PicoScope 2000 Series

User's Guide

PS2000044-1.1

PC Oscilloscopes

PicoScope 2000 Series User GuideI

PS2000044-1.1

Table of Contents

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

1 Introduction

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

1 Overview

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

2 Safety symbols

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

3 Safety warning

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

4 FCC notice

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

5 CE notice

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

6 Licence conditions

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

7 Trademarks

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

8 Warranty

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

9 Company details

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

2 Product information

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

1 Minimum system requirements

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

2 Installation instructions

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

3 Specifications

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

4 Sampling modes

.............................................................................................8

3 Glossary

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

Index

Introduction 1

1Introduction

1.1 Overview

The

PicoScope 2000 series

is a range of low-cost, high-performance PC Oscilloscopes,

fully

USB 2.0

capable and backwards compatible with USB 1.1. There is no need for an

additional power supply as power input is from the USB port, so these oscilloscopes are

highly portable.

With the

PicoScope software

, you can use PicoScope 2000 series oscilloscopes as PC

Oscilloscopes and spectrum analysers; with the

PicoLog software

, you can use them as

data loggers.

A PicoScope 2000 PC Oscilloscope is supplied with the following items:

USB cable, for use with both types of USB port

Software CD

Quick start guide

Please read the important information in this introductory section and then proceed to the

Installation instructions

1.2 Safety symbols

Symbol 1: Warning Triangle

This symbol indicates that a safety hazard exists on the indicated connections if

correct precautions are not taken. Ensure that you read all safety documentation

associated with the product before using it.

Symbol 2: Equipotential

This symbol indicates that the outer shells of the indicated BNC connectors are all at

the same potential (shorted together). You must therefore take necessary precautions

to avoid applying a potential across the return connections of the indicated BNC

terminals, as this may result in a large current flow causing damage to the product

and/or connected equipment.

PicoScope 2000 Series User Guide

1.3 Safety warning

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

your oscilloscope for the first time. Safety protection built in to the equipment may cease

to function if the equipment is used incorrectly. This could cause damage to your

computer, or lead to injury to yourself and others.

Maximum input range

PicoScope 2000 Series PC Oscilloscopes are designed to measure voltages in the range

-20 V to +20 V. Any voltages in excess of ±100 V may cause physical damage.

Mains voltages

Pico Technology products are not designed for use with mains voltages. To measure

mains, use a differential isolating probe specifically designed for a high source voltage.

Safety grounding

PicoScope 2000 Series PC Oscilloscopes connect directly to the ground of a computer

through the interconnecting cable provided. This method minimises interference.

As with most oscilloscopes, avoid connecting the ground input to any source other than

ground. If in doubt, use a meter to check that there is no significant AC or DC voltage

between the ground input of the oscilloscope and the point to which you intend to connect

it. Failure to check may cause damage to your computer, or lead to injury to yourself and

others.

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

Repairs

The oscilloscope contains no serviceable parts. Repair or calibration of the oscilloscope

requires specialised test equipment and must be performed only by Pico Technology.

1.4 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 own expense.

For safety and maintenance information see the

safety warning

Introduction 3

1.5 CE notice

The PicoScope 2000 Series of PC Oscilloscopes meets the intent of the

EMC directive

89/336/EEC

and has been designed to

EN61326-1 (1997) Class B Emissions and

Immunity

standard.

Products from the PicoScope 2000 series also meet the intent of the

Low Voltage

Directive

and have been designed to meet the

BS EN 61010-1:2001 IEC 61010-1:2001

(safety requirements for electrical equipment, control, and laboratory use) standard.

1.6 Licence conditions

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.

Pico Technology Limited claims the copyright of, and retains the rights to, 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

Because 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; for example, life-support systems.

1.7 Trademarks

Windows

and

Excel

are registered trade marks of Microsoft Corporation.

Pico

Technology Limited

and

PicoScope are internationally registered trademarks.

PicoScope 2000 Series User Guide

1.8 Warranty

Pico Technology warrants upon delivery, and for a period of 24 months unless otherwise

stated from the date of delivery, that the Goods will be free from defects in material and

workmanship.

Pico Technology shall not be liable for a breach of the warranty if the defect has been

caused by fair wear and tear, wilful damage, negligence, abnormal working conditions or

failure to follow Pico Technology's spoken or written advice on the storage, installation,

commissioning, use or maintenance of the Goods or (if no advice has been given) good

trade practice; or if the Customer alters or repairs such Goods without the written consent

of Pico Technology.

1.9 Company details

Address:

Pico Technology Limited

The Mill House

Cambridge Street

St Neots

Cambridgeshire

PE19 1QB

United Kingdom

Phone:

+44 (0) 1480 396 395

Fax:

+44 (0) 1480 396 296

Email:

Technical Support:

[email protected]

Sales:

[email protected]

Web site:

www.picotech.com

Product information 5

2Product information

2.1 Minimum system requirements

For PicoScope 2000 series PC Oscilloscopes to operate, a computer with the minimum

system requirements to run Windows or the following (whichever is the higher

specification) is required:

Processor

Pentium class processor or equivalent minimum.

Memory

32 MB minimum.

Disk space

10 MB minimum.

Operating system

Microsoft Windows 98 SE, ME, Microsoft Windows 2000, XP or

later.

Ports

USB 1.1 compliant port minimum. USB 2.0 compliant port

recommended. Must be connected direct to the port or a powered

USB hub. Will not work on a passive hub.

2.2 Installation instructions

Important

Do not connect a

PicoScope 2000 series

PC Oscilloscope to the PC until you have

installed the software.

Install the software by following the steps in the installation guide supplied with your

oscilloscope.

Connect your oscilloscope to the PC with the USB cable supplied.

There is no need for an additional power supply as power is drawn from the USB port.

Checking the installation

Once the software has been installed, ensure that the oscilloscope is connected to the

PC and start the

PicoScope

PicoLog

software. The software should now display the

voltage that you have connected. If you are using a scope probe and PicoScope, you

should see a small 50 Hz or 60 Hz mains signal in the oscilloscope window when you

touch the scope probe tip with your finger.

Standard oscilloscope connectors

PicoScope 2000 series

PC Oscilloscopes have standard oscilloscope connectors. The

PicoScope 2000 Series User Guide

input impedance is also standard, so the x10 function on scope probes works correctly.

Connector diagram

USB port connector.

LED. When lit, indicates the oscilloscope is sampling data.

Channel A input.

Channel B input.

Product information 7

2.3 Specifications

PicoScope 2202

Vertical Resolution

8 bits

Analog Bandwidth

2 MHz

Maximum Sampling Rate

Single-channel

Dual-channel

20 MS/s

10 MS/s per channel

Buffer Size

Single-channel

Dual-channel

32 ksamples

16 ksamples per channel

Inputs

2 channels with BNC sockets

1 M

impedance

AC/DC

coupling

20 pF input capacitance

Voltage Ranges

± 50 mV to ± 20 V ranges in 9 ranges

Accuracy

3 % (voltage)

100 ppm (time)

Operating Environment

Temperature range

Humidity

0°C to 70°C

(20°C to 30°C for quoted accuracy)

25% to 75% RH

Overload Protection

± 100 V

PC Connection

USB 2.0

Compatible with

USB 1.1

Power Supply

From USB port: 4.6 to 5.25 V; 500 mA

External power supply is not required

Maximum Dimensions

140 mm x 190 mm x 45 mm

Compliance

CE standard

;

FCC standard

2.4 Sampling modes

PicoScope 2000 series

PC Oscilloscopes can run in various sampling modes. At high

sampling rates, the oscilloscope collects data much faster than a PC can read it. To

compensate for this, the oscilloscope stores a block of data in an internal memory buffer,

delaying transfer to the PC until a preset number of data points has been sampled. This

is called

block mode

. At very low sampling rates, you may want to switch to

streaming

mode

. This allows accurately timed data to be transferred back to the PC in short blocks,

without gaps.

Real time continuous mode

is also provided for use at low sampling

rates, when immediate data transfer without gaps is required but timing accuracy is not

critical.

PicoScope 2000 Series User Guide

3Glossary

AC/DC switch

To switch from alternating current to direct current, or vice versa, select AC or DC from

the control on the oscilloscope toolbar of the PicoScope software application. The setting

should be adjusted to suit the characteristics of the input signal.

Analog bandwidth

The input frequency at which the signal amplitude has fallen by 3 dB from its nominal

value.

Block mode

A sampling mode in which the computer prompts the oscilloscope to collect a block of

data into its internal memory before stopping the oscilloscope and transferring the whole

block into computer memory. This mode of operation is suitable when the input signal

being sampled contains high frequencies. Note: To avoid aliasing effects, the sampling

rate must be greater than twice the maximum input frequency.

Buffer size

The size of the oscilloscope buffer memory. The buffer memory is used by the

oscilloscope to store data temporarily. This allows the oscilloscope to sample data

independently of the speed at which it can transfer data to the computer.

Device Manager

Device Manager is a Windows applet that displays the current hardware configuration of

your computer. On Windows 98 or Windows ME, right click on 'My Computer' and choose

the 'Device Manager' tab. On Windows 2000 or Windows XP, right click on 'My

Computer,' choose the 'Hardware' tab and select 'Device Manager'.

Driver

A software application that controls a piece of hardware. The driver for the

PicoScope

2000 series PC Oscilloscopes is supplied in the form of a 32 bit Windows DLL. This is

used by the PicoScope and PicoLog software to control the oscilloscopes.

Maximum sampling rate

A figure indicating the maximum number of samples the oscilloscope is capable of

acquiring per second. Maximum sample rates are usually given in MS/s (megasamples

per second) or GS/s (gigasamples per second.) The higher the sampling speed of the

oscilloscope, the more accurate the representation of the high-frequency details in a fast

signal.

PC Oscilloscope

An instrument consisting of a PicoScope 2000 series PC Oscilloscope and the PicoScope

software application.

PicoLog software

This is a software product that accompanies all our oscilloscopes. It turns your PC into a

data logger and chart recorder.

PicoScope 2000 series

A PC Oscilloscope range that includes the PicoScope 2202 PC Oscilloscope.

PicoScope software

This is a software product that accompanies all our oscilloscopes. It turns your PC into an

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