Agilent Technologies 11867A? Uživatelský manuál stáhnout pdf (Strana 13)

Operation

Environment

The operating environment should be with

the

following limitations:

• Temperature:

ooc

to +55°C

•

Humidity: <95% relative

• Altitude: <4572 meters (15,000 feet)

Instructions

Caution

not

apply more

than

10 W average power or 100 W peak power to

the

limiter. There should be <1.3

Vdc

with no

applied,

and

0.0

Vdc

when

applied. Permanent damage to

the

diodes could result from exceeding these

levels.

For reliable operation over its full frequency

and

power range,

the

limiter must be used as a

unidirectional device. Incident power must be applied as shown on

the

label of

the

limiter. The

limiter can be used to protect

the

input mixer

a spectrum analyzer,

the

sampler of a network

analyzer,

the

power sensor (or thermistor mount) of a power meter, or

the

input circuitry of

any other device

that

might be subjected to transients and accidental overloads.

The use

an attenuator between the limiter and

the

device

is protecting is recommended

to minimize measurement uncertainty

that

is due to multiple mismatches. For example,

set

the

input attenuator of a spectrum analyzer to

least

dB.

Harmonic distortion is generated by

the

limiter while it is limiting.

the

incident signal

exceeds

the

limiting threshold, use attenuation between

the

limiter and

the

source to reduce

the

signal below 1 m

Typical harmonic distortion below

the

limiting threshold is shown in

Figure

1-4.

The limiter will still prevent transients from damaging

the

device it is protecting.

;-::

:::;;

r-----~------r-----~----~------+------+----~

:;:)

Lj.Q

<:J

a::

~~~~0~~~+-----~--~-----+----~

~----~~=---

p.o

H_~Q--'----+'

·-------+------+------+------1

_,..,. I

/~l>

I-

(f)

a::

I-

-Lj.Q

-30 -20 -10

+10

+20

+30

POWER

- dBm

Figure

1-4.

Typical

Harmonic

Distortion

Versus

Input

Power

1-6

11867

RFLimiter

wn35b

1 2 ... 8 9 10 11 12 13 14 15

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