Agilent Technologies 86100C Manual do Utilizador descarregar pdf (Página 7)

7

Built-in information system

The 86100C has a context-

sensitive on-line manual

providing immediate answers

to your questions about using

the instrument. Links on the

measurement screen take you

directly to the information you

need including algorithms for

all of the measurements. The on-line

manual includes technical

specifications of the mainframe and

plug-in modules. It also provides

useful information such as the

mainframe serial number, module

serial numbers, firmware revision

and date, and hard disk free space.

There is no need for a large paper

manual consuming your shelf space.

File sharing and storage

Use the internal 40 GB hard drive to

store instrument setups, waveforms,

or screen images. A 64MB USB

memory stick is included with the

mainframe. Combined with the USB

port on the front panel this provides

for quick and easy file transfer.

Images can be stored in formats

easily imported into various

programs for documentation and

further analysis. LAN interface is

also available for network file

management and printing. An

external USB CD-RW drive is

included with the mainframe. This

enables easy installation of software

applications as well as storage of

large amounts of data.

Powerful display modes

Use gray scale and color graded trace

displays to gain insight into device

behavior. Waveform densities are

mapped to color or easy-to-interpret

gray shades. These are infinite

persistence modes where shading

differentiates the number of times

data in any individual screen pixel

has been acquired.

Internal triggering

through clock recovery

Typically an external timing

reference is used to synchronize the

oscilloscope to the test signal. In

cases where a trigger signal is not

available, clock recovery modules are

available to derive a timing reference

directly from the waveform to be

measured. The Agilent 8349XA series

of clock recovery modules are

available for electrical, multimode

optical, and single-mode optical

input signals. All 8349XA modules

have excellent jitter performance to

ensure accurate measurements. Each

clock recovery module is designed to

synchronize to a variety of common

transmission rates.

Clock recovery loop bandwidth

The Agilent clock recovery modules

have two loop bandwidth settings.

Loop bandwidth is very important

in determining the accuracy of your

waveform when measuring jitter, as

well as testing for compliance.

• Narrow loop bandwidth provides

a clean system clock for accurate

jitter measurements

• Wide loop bandwidth in some

applications is specified in the

standards for compliance testing.

It allows the recovered clock to

track the data and is useful for

extracting a signal that may have

propagated through a complex

network and have large amounts of

jitter. While this obviously negates

any ability to quantify the jitter, it

does allow other parameters of an

eye to be measured.

Note: When using recovered clocks

for triggering, the amount of jitter

observed will depend on the loop

bandwidth. As the loop bandwidth

increases, more jitter is “tracked

out” by the clock recovery resulting

in less observed jitter. This is

desired by many standards, but

it is important in a measurement

environment to understand the

effect that the clock recovery has on

the quantity of jitter being measured.

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