AA5001 Просмотр технического описания (PDF) - Unspecified

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AA5001

Programmable Audio Test System

Unspecified 

TM 500 / 5000

MODULAR TEST INSTRUMENTS

Typical Applications

One ideal application for automated audio

testing is the moderate-to-high volume

production line for consumer and

professional audio equipment. Test results

can be economically logged or printed for

files or to be furnished to the customer. In

the engineering laboratory, characterization

of complex variable devices such as

parametric equalizers can be greatly

speeded with automatic test equipment, and

a color ink-jet printer can quickly produce

highly legible results. Audio tape recorders

and the audio channels of video tape,

cassette, and disc machines may be tested

with no special synchronization required,

as can be earth stations and radio networks

when a stepped tone signal is available.

Performance levels of the SG 5010/AA

5001 system are consistent with new 16-bit

digital system noise and distortion levels.

Radio and TV broadcasting stations and

networks can automate proof-of-performance

tests, even running them daily at sign-on or

sign-off to maintain signal quality control.

Highly complex devices, such as large

recording consoles with multiple inputs and

outputs or large audio switchers, may be

impractical to test with manual techniques

and truly maintainable only via automation.

Loudspeakers and microphones can be

automatically characterized by the addition

of reference transducers and pre-amplifiers

to the system. Swept pre-emphasis, de-

emphasis, or equalized signals can be easily

generated since the controller has full

control over both frequency and amplitude.

Other Measurement Capabilities

Features and flexibility of the AA 5001

and SG 5010 permit a variety of other

measurements to be easily automated.

SMPTE-like IMD measurements may be

made at a variety of lower frequencies and

any value of upper frequency, and at 1:1

amplitude ratios in addition to the standard

4:1 ratio. A CCIF test with the frequencies

selected near the upper band limit of the

device under test has been shown to be a

very effective and simple-to-implement

test for transient or dynamic

intermodulation (TIM and DIM). Burst

signals of any desired duty cycle may be

generated for IHF dynamic headroom

measurements and to test compressors and

limiters; the between-bursts level may be

selected as OFF or 20 dB below the burst

level. Power measurements are made by a

controller computation from a voltage

measurement across a known load

resistance. SINAD measurements of

sensitivity of FM communications

receivers are a standard capability of the

AA 5001 plus an appropriate RF signal

generator. The SG 5010 features an

amplifier mode in which an external signal

can be converted to the high level,

multiple impedance, balanced and floating

capability of the SG 5010 output circuitry.

Fully program-selectable filters in the

AA 5001 allow various choices of bandwidth

for distortion measurements and weighting

for noise measurements, or rejection of

interfering signals. Phase measurements

can be added to the system by use of the

DC 5010 Universal Counter-Timer.

GPIB Controller

Since the instruments are IEEE-488

compatible, any IEEE-488 controller may

be used with them.

Software Features

Both the SG 5010 oscillator and the

AA 5001 analyzer feature very high level,

English-like commands for their various

modes and functions. LEARN mode is a

standard feature, permitting instrument

setups to be made at the front panel and

then learned at the controller by a single

keystroke. Both instruments are

microprocessor-based, with the distributed

intelligence of the system used to simplify

the controller’s task by such things as a

programmable settling algorithm in the

analyzer and stored setups plus logarithmic

or linear sweeps of frequency or amplitude

in the oscillator.

Test Result Documentation

Audio test results are obtainable in a variety

of ways. Graphics of one or more measured

variables versus frequency or amplitude

are readily produced on the controller CRT.

Tabular results can also be shown on the

CRT and duplicated in hard copy. Graphic

test results can also be produced even

without a GPIB controller if an X-Y plotter

or storage oscilloscope is available, due to

the built-in sweep capabilities of the SG

5010 plus its ramp output and pen lift signal.

TM 5000/TM 500 Family

As members of the TEGAM modular

TM 5000 family of programmable general

purpose instruments, these new products

expand the number of systems which can

be configured for a variety of applications.

Programmable counters, digital multimeters,

power supplies, function generators,

switchers, and control and sensing interface

devices are available to complete systems.

Even many of the TM 500 instruments,

although not programmable, may

appropriately be added for specific test

systems needs. Examples include products

such as the AM 502 Differential Amplifier

and a variety of sine and function

generators and dc power supplies. Details

and specifications on these products are

available from TEGAM.

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