Agilent Technologies 82357B Manual do Utilizador descarregar pdf (Página 3)

pluggable, making it easy to

connect and disconnect without

having to shut down the

computer. No external power

supplies are necessary.

Full Assurance for

Interoperability

The USB/GPIB Interface comes

with the Agilent I/O Libraries

Suite that includes VISA and

SICL. VISA enables interoperabili-

ty among different instrument

and software vendors. The IO

Libraries Suite also provides

robust instrument control and

works with the software

development of your choice.

Standard GPIB functionality is

provided by implementing the

IEEE 488.1 and IEEE 488.2

specifications. These specifications

provide defined mechanical and

electrical characteristics, and a

basic set of instrument commands

and common data formats.

Using industry standards gives

you the assurance and confidence

that your programs will work

with multiple hardware and

software vendors, and migrate

to new standards in the future.

Standard Computer IO

In the past, RS-232 and GPIB

have been the primary interfaces

used for connecting instruments

to PCs in test and measurement

applications. Although RS-232

offers a low-cost solution, RS-232’s

lower baud rate and connection

limitations are cumbersome and

too slow for many of today’s

measurement needs.

GPIB has provided a high

performance, cost effective, and

also reliable solution for more

than 25 years. Today, however,

computers have fewer available IO

slots, leaving engineers with little

options but to use more

expensive solutions such as

industrial PCs.

With USB and LAN built into

most of today’s PCs, standard

computer IO has evolved into

a solution that is acceptable for

automation and control of test

and measurement instruments.

Early USB devices that were

initially developed for connecting

PCs to peripherals such as

keyboard, mouse and so forth

offered little bandwidth. Today,

USB offers bandwidths up to 12

Mbits/s for USB 1.1 and 480

Mbits/s for USB 2.0. The 82357B

USB/GPIB Interface runs at USB

2.0.

The 82357B USB/GPIB Interface

uses a thin, flexible, high-quality

USB cable that is USB 1.1 and 2.0

compliant. This cable is shielded

and specified to 1,500 insertions,

ensuring a durable connection

and reliable data transfer.

The 82357B is capable of transfer

rates over 1.15 MB/s with large

block transfers. The performance

is better than typical GPIB cards

for block sizes over 32KB. Small

block transfers are limited by the

USB implementation and the

overhead associated with setting

up the transfer. However, since

instrument setup time can

dominate the overall test time,

this impact may be minimal.

If small block transfer

performance is critical, then you

may consider the Agilent 82350A

PCI GPIB interface.

Make the Connection

You may connect directly to one

instrument with no additional

GPIB cables required with the

82357B USB/GPIB Interface.

For multiple instruments

connection, use a daisy chain or

star configuration with your GPIB

instruments using standard GPIB

cables. Once the instruments are

connected, connect the USB/GPIB

Interface as the last connection

on one of the instruments.

One 82357B USB/GPIB Interface

supports up to 14 GPIB instruments.

Multiple 82357B USB/GPIB

Interfaces can be connected to

improve system performance.

Another additional significant

feature would be the parallel

polling capability of the 82357B

USB/GPIB Interface. This allows

you to easily check up to eight

individual devices at once,

corresponding to the number of

data lines on the GPIB.

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