Rigol USB-GPIB Adapter Instrukcja Użytkownika Pobierz pdf

QST

– Devoted entirely to Amateur Radio www.arrl.org February 2013 55

Reviewed by Bob Allison,

WB1GCM

ARRL Test Engineer

[email protected]

A spectrum analyzer is a

test instrument that mea-

sures RF signal level ver-

sus frequency, referred to

as measurements in the

frequency domain. Unlike

an oscilloscope that mea-

sures in the time domain, a

spectrum analyzer can eas-

ily be used to detect and ob-

serve frequency, power level, harmonics,

bandwidth and other signal parameters.

One of the key tests I perform at the ARRL

Lab is the emission standards evaluation of

transmitters and amplifiers in which the

levels of all harmonics and spurious emis-

sions are compared to the fundamental

(carrier) signal. Typically this measurement

is performed with our calibrated Agilent/HP

8563E spectrum analyzer, which covers

9 kHz to 26.5 GHz. The HP 8563E is an

accurate, laboratory grade professional

instrument, but it is cost prohibitive for

most radio amateurs and experimenters.

A used laboratory grade spectrum analyzer

such as the HP 8563E can cost tens of

thousands of dollars, and one of these

instruments is overkill for most amateur

experimenters.

Headquartered in China, Rigol (pronounced

“regal”) is an established manufacturer of

test equipment that is distributed worldwide.

Rigol recently introduced the DSA815, a

9 kHz to 1.5 GHz spectrum analyzer with a

starting price of $1295. Rigol has been ad-

vertising the DSA815 in QST and demon-

strating it at ham conventions. ARRL

members inquired about the unit, feeling

that “it was too good to be true.” As a test

engineer, I was curious too, so our Product

Review editor ordered the DSA815-TG,

Rigol Technologies DSA815-TG

Spectrum Analyzer

understanding the basic func-

tions, as most of the controls

are the same as on other, more

expensive units.

A USB computer connection and

a PRINT button allow display and

setup data to be retrieved with-

out the typical GPIB interface

seen on many older spectrum

analyzers and other profes-

sional test equipment. (GPIB

— the General Purpose

Interface Bus — is also known

as IEEE 488. Rigol offers a

USB to GPIB adapter as an op-

tion.) I like the flip-up front feet that

enable ergonomically friendly desktop

operation. The DSA815-TG is vented from

the sides with a very quiet fan.

Type N connectors on the front panel are

used for RF INPUT and GEN OUTPUT (tracking

generator output). Both are 50 Ω. Along

with the 120 V ac power connection, the

rear panel jacks are for USB and LAN con-

nections, BNC 10 MHz in/out reference con-

nections, and a BNC connection for the

trigger input. The outside looks neat and

modern; but what about the inside?

Bottom Line

The Rigol DSA815-TG is a light-

weight, portable spectrum analyzer

that is affordable for serious experi-

menters and self employed service

technicians. It has many uses in the

amateur workshop.

the model with a factory installed tracking

generator, for $1495.

Overview

The Rigol DSA815 is compact unit that

sports a handle and weighs in at a mere

9.4 pounds, suitable for both laboratory and

portable operation. The 8 inch diagonal col-

orful LCD screen dominates the front panel

and has a resolution of 800 × 400 pixels.

Anyone who is familiar with the operation

of spectrum analyzers will have no trouble

Figure 2 — In the Lab we use one or more high power attenuators and a step attenuator to bring

the power of a transmitter under test down to a safe level for the input of test equipment (usually

we shoot for around 1 mW). Here the DSA815-TG is used to observe the fundamental signal and

harmonics of a 2 meter handheld.

1 2 3 4

Podsumowanie treści

Strona 1 - Spectrum Analyzer

QST® – Devoted entirely to Amateur Radio www.arrl.org February 2013 55Reviewed by Bob Allison, WB1GCMARRL Test [email protected] spe

Strona 2 - Table 2

56 February 2013 ARRL, the national association for Amateur Radio® www.arrl.org While I dared not open it up to take a peek (this voids the

Strona 3 - QS1302-Prodrev05

QST® – Devoted entirely to Amateur Radio www.arrl.org February 2013 57Frequency (MHz)80 Meter Band-pass Filter TestTracking Generator Level

Strona 4 - New Products

58 February 2013 ARRL, the national association for Amateur Radio® www.arrl.org DX cluster network, and its database contains the connectio

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