Rigol USB-GPIB Adapter Manuel d'utilisateur télécharger pdf (Page 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 calibration), Rigol explains,

“The DSA815 uses digital IF technology

(DSP), that enables smaller bandwidth set-

tings which reduces the average noise level.”

The narrowest filter bandwidth setting of this

model is 100 Hz. The use of this technology

reduces the complexity of the hardware and

also explains its compact size. The frequency

range of this unit is 9 kHz to 1.5 GHz, rea-

sonable for measurements of most amateur

equipment. Other Rigol models offer fre-

quency coverage to 3 GHz, greater sensitivity

and narrower resolution bandwidth.

In the ARRL Lab, our RF shielded screen

room and instruments are set up for the test-

ing of typical Amateur Radio equipment, not

for testing other laboratory instruments. To

verify whether or not the DSA815 performs

as specified in Rigol’s literature, I sent the

unit to the lab that annually calibrates our test

equipment — Essco Calibration Laboratory

of Chelmsford, Massachusetts. Essco

checked all specifications, and soon after-

ward it arrived back at the ARRL Lab sport-

ing a calibration sticker. Table 2 lists Rigol’s

key specifications for the DSA815-TG, and

Essco confirms that the test results are “as

specified.”

Applications

The user of the DSA815 and all other spec-

trum analyzers must pay close attention to

the power levels at the input. With the Rigol,

any power level greater than +20 dBm

(100 mW) will lead to an expensive repair

and recalibration, so a power attenuator and

step attenuators are always used between the

device under test and the spectrum analyzer.

In the Lab for safety’s sake and to avoid

overload leading to measurement errors, we

use an input signal no greater than 1 mW and

use attenuation as needed to get to that level.

Figure 2 shows a typical Lab setup for testing

a transmitter. For more information on how

we use spectrum analyzers during various

tests we perform on Amateur Radio equip-

ment, please check out the ARRL Lab’s

Procedure Manual online.

The ARRL Hand-

book also explains the use of spectrum ana-

lyzers in its Test Equipment and Measure-

ment chapter.

Table 2

Rigol Technologies Spectrum Analyzer,

Model DSA815-TG, s/n DSA8A142400036

The following manufacturer’s speciﬁcations have been determined to be “as speciﬁed”

by Essco Calibration Laboratories, of Chelmsford, Massachusetts.

Frequency range: 9 kHz to 1.5 GHz.

Frequency resolution: 1 Hz.

Internal frequency reference: 10 MHz.

Temperature drift, 20° to 30° C: <2 ppm.

Marker resolution: Span / (sweep points – 1).

Marker frequency counter resolution: 1 Hz, 10 Hz, 100 Hz, 1 kHz, 10 kHz, 100 kHz.

Frequency span: 0 Hz, 100 Hz to 1.5 GHz.

SSB phase noise, carrier offset, 10 kHz: <–80 dBc/Hz.

Resolution bandwidth (RBW), (–3 dB): 100 Hz to 1 MHz, in 1-3-10 sequence.

RBW, (–6 dB) (Option): 200 Hz, 9 kHz, 120 kHz.

RBW uncertainty: <5%, nominal.

Resolution ﬁlter, shape factor (60 dB:3 dB): <5, nominal.

Video bandwidth (–3 dB): 1 Hz to 3 MHz, in 1-3-10 sequence.

Amplitude measurement range: 10 MHz to 1.5 GHz, displayed average noise level (DANL)

to +20 dBm; 100 kHz to 10 MHz, DANL to 0 dBm.

Maximum rated input level, dc voltage: 50 V.

CW RF input power (with RF attenuation = 30 dB): +20 dBm (100 mW).

Maximum RF input level before damage: +30 dBm (1 W).

Displayed average noise level (DANL), with 0 dB RF attenuation, RBW=VBW=100 Hz,

sample detector, trace average = 50:

Preampliﬁer off: 100 kHz to 1 MHz: <–90 dBm, typical –110 dBm; 1 MHz to 1.5 GHz,

<–110 dBm + 6 × (f/1GHz) dB, typical –115 dBm.

Preampliﬁer on: 100 kHz to 1 MHz, <–110 dBm, typical –130 dBm; 1 MHz to

1.5 GHz, <–130 dBm + 6 × (f/1 GHz) dB, typical –135 dBm.

Level display range: log scale, 1 dB to 200 dB; linear scale, 0 to reference level.

Number of points: 601; number of traces: 3+ math trace.

Trace detector: Normal, Positive-Peak, Negative-Peak, Sample, RMS, Voltage Average,

Quasi-Peak (optional).

Trace functions: Clear Write, Max Hold, Min Hold, Average, Freeze, Blank.

Scale unit: dBm, dBmV, dBµV, nV, µV, mV, V, nW, µW, mW, W.

Frequency response, 10 dB RF attenuation, relative to 50 MHz, 20° to 30° C:

(Preampliﬁer off), 100 kHz to 1.5 GHz, <0.7 dB;

(Preampliﬁer on),1 MHz to 1.5 GHz, <1.0 dB.

Input attenuation setting range: 0 to 30 dB, in 1 dB steps.

Reference level range: –100 dBm to +20 dBm in 1 dB steps.

Resolution: log scale, 0.01 dB; linear scale, 4 digits.

RF input VSWR, 10 dB RF attenuation, 1 MHz to 1.5 GHz: <1.5.

Intermodulation, second harmonic intercept: +40 dBm; third-order intercept, fc >30 MHz,

+10 dBm.

1 dB gain compression, total input power of mixer, fc = 50 MHz, preampliﬁer off: >0 dBm.

Note: Mixer power level (dBm) = input power (dBm) – input attenuation (dB).

Spurious responses: image frequency, <–60 dBc; intermediate frequency, <–60 dBc;

spurious response, inherent, <–88 dBm, typical.

Sweep time range: 100 Hz =Span= 1.5 GHz, 10 ms to 1500 s; zero span, 20 µs to 1500 s.

Sweep mode: continuous, single.

Trigger source: free run, video, external. External trigger level: 5 V TTL level.

Tracking generator (TG) (DSA815-TG) frequency range: 9 kHz to 1.5 GHz.

TG output level: –20 dBm to 0 dBm, in 1 dB step.

TG output ﬂatness: 1 MHz to 1.5 GHz, referenced to 50 MHz: ±3 dB.

Input/output RF impedance: 50 Ω. Connector: N-type, female.

TG output impedance: 50 Ω. Connector: N-type, female.

10 MHz REF IN/10 MHz REF OUT/external trigger in connector: BNC female.

10 MHz REF IN amplitude: 0 dBm to +10 dBm.

10 MHz REF OUT amplitude: +3 dBm to +10 dBm.

Display type: TFT LCD. Resolution: 800 × 480. Size: 8 inch. Colors: 64 k.

Printer protocol: PictBridge.

Remote control: USB, USB TMC, LAN 10/100 Base-T, RJ-45, LXI-C Class, IEC/IEEE BUS

(GPIB) with USB-GPIB interface converter option IEEE 488.2.

Power supply input voltage range, ac: 100 V to 240 V, nominal, 45 Hz to 440 Hz.

Power consumption: typical 35 W, max 50 W with all options.

Operating temperature range: 5° to 40°C; storage temperature range: –20° to 70°C.

Dimensions (HWD): 7.0 × 14.2 × 5.0 inches; weight, with tracking generator: 9.4 lbs.

Price: DSA815-TG, $1495; DSA815 (without tracking generator), $1295.

The ARRL Lab Test Procedures Manual is avail-

able for download from www.arrl.org/product-

review.

The ARRL Handbook, 2013 edition. Available

from your ARRL dealer or the ARRL Bookstore,

ARRL order no. 4050. Telephone 860-594-

0355, or toll free in the US 888-277-5289;

www.arrl.org/shop; [email protected]g.

Chapter 25, Test Equipment and Measure-

ments, explains the use of spectrum analyzers.

1 2 3 4

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