Neutrik Cortex Instruments A2 Test Set
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Модель:
A2
Дата:
2001
Категория:
Группа:
Описание:
Audio Test & Measurement System
Информация
Overview
The NTI A2 is a comprehensive, high performance two -channel
audio Test Set. It includes a
flexible Generator, based on a Digital Signal Processor
(DSP) and a high performance
Analyzer providing a wide variety of measurement functions,
as there are
• Level absolute (two -channel) in μV, mV, V, dBV and dBu or dBm
•
Level relative in *1, % and dBr
•
Level selective in μV, mV, V, dBV and dBu / dBm
•
Total harmonic distortion & noise (THD+N) in % and dB
•
IMD (Intermodulation distortion) in % and dB
•
Wow & Flutter in %
•
Noise (absolute), weighted and unweighted, in μVq, mVq, Vq
and d Bq
•
Noise (relative), weighted and unweighted, in *1, % and dBr
•
Crosstalk (frequency selective) in *1, % and dBr
•
Frequency (two channels simultaneously)
•
Phase (interchannel) in the range of ±180°.
In the METER display mode, all measurement results are
displayed in numerical form as
large digits and in analog form through a bar-graph.
Additional parameters like the I/O-
frequencies and impedances, the input levels and the
Generator settings are permantly
shown.
The standard sweep capabilities of the A2/A2-D allow to perform
•
Frequency sweeps
•
Amplitude Sweeps
•
Time Sweeps
•
Table sweeps with freely definable pairs of frequency and
level (with Option AO1)
Sweeps can be controlled by the built-in Generator or by an
external source (e.g. test tapes,
test CDs or other NTI A-series instruments) at a remote
location. Several traces can be
recorded and displayed in the GRAPH mode, while up to four
complete graphs may be
stored in the internal non -volatile memory of the A2/A2-D.
This allows for instance to record
swept measurements in a studio and to print out the results
in the office later.
Another powerful diagnostic aid of the A2 is the SCOPE
function. In this mode, the waveform
of both input channels is shown on the LC-display just like
on a dual trace Oscilloscope. If set
to the THD+N function, the A2/A2-D shows both the original
signal and the distortion
residual. In other measurement functions, the main input
signal is shown as a single trace.
All measurements of level - except noise - are true RMS
rectified. Noise is measured as
quasi-peak value according to the CCIR 468-3 standard. Both
a 400Hz high -pass and a
22Hz-22kHz band-pass Filter are available as a standard.
The two inputs of the A2/A2-D are DC -isolated up to ±300Vp,
and equipped with selectable
input impedances to optimally match the output impedance of
the device under test (DUT).
As an option, both inputs may also be Phantom-powered.
The normalized input signals are available at the BNC
connectors at the rear panel of the
instrument. A small, built-in loudspeaker allows acoustical
monitoring of the measured signal.
The versatile Generator of the A2/A2-D, based on a Digital
Signal Processor, is capable of
generating a large number of different test signals over the
full level & frequency range.
• Low distortion pure sine signal
•
Low distortion warbled sine
•
Dual -tone IMD signal, covering all standards
•
Symmetric square wave (50:50 duty cycle)
•
Asymmetric square wave (40:60 duty cycle for phase reverse
check)
•
White noise
•
Pink noise
The output impedance (<15Ω up to 600Ω) can be adjusted in a
wide range as well in order to
match the input impedance of the device to be tested.
As an option, a RS-232 serial or IEEE-488 parallel Interface
may be installed into the
instrument to remote control all A2/A2-D features from a PC.
Regardless of the type of Interface, AS04, a comprehensive
Windows based Software
package is included, supporting all operation modes,
offering the possibility to store all
results, and allowing to write program sequences in the
easy-to-learn Audio Measurement
Sequence Language (AMSL) for fully automatic measurements.
Hасто́льная кни́га тип:
Руководство пользователя
Страницы:
52
Размер:
3.71 Mbytes (3885117 Bytes)
Язык:
english
Пересмотр:
Hасто́льная кни́га ID:
Дата:
2001 07 01
Качество:
Электронный документ, ни сканирование, очень хорошо читается.
Дата загрузки:
2017 12 17
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Загрузки:
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Информация
1. I NTRODUCTION
...
10
Safety Information
...
10
Overview ...
10
How to use this Manual
...
12
2. I NSTALLATION
...
13
Unpacking ...
13
Options and
Accessories ...
13
Environmental Conditions
...
13
Mains Power
Supply ...
13
Printer Connection
...
14
Interface to PC
...
14
3. G ETTING STARTED
...
15
Measurement Functions
...
15
Menu Operation
...
15
Generator Settings
...
16
The Display Modes
...
16
Sweep Operation
...
17
The A2/A2 -D User
Interface ...
18
A2/A2-D Menu
Overview ...
19
4. A2/A2-D OPERATION
...
21
Input Section
...
21
Input Block
Diagram ...
22
Input Wiring &
Impedances ...
22
Input / Output Impedance
Selection ...
... 23
Auto / Fixed
Range ...
... 24
Connection of a Balanced Output to the
A2/A2-D ... 25
Connection of an Unbalanced Output to the A2/A2-D
... 25
Monitor
Outputs ...
26
Monitor Loudspeaker
...
26
Overview
...
26
Output
Section ...
27
Output Circuit
...
27
Balanced Operation
...
... 28
Unbalanced Operation ...
... 28
Optional Transformer Output
Stage ...
... 28
Output Settings
...
29
Output Parameters ...
... 29
Signal
Waveform ...
... 29
Square Signal (Sym. / Asym.)
...
... 30
IMD TestSig
... 30
Noise
...
... 31
Warbled
Sine ...
... 31
Frequency
...
31
Level ...
31
Readback
...
32
Output
Muting ...
33
Overview
...
33
Display Modes
...
34
METER Display
Mode ... 34
Generator Settings ...
... 35
Generator Readback ...
... 35
Measurement Results
...
... 35
Units
...
... 35
The Bar-graph ...
... 36
Zooming the Bar-graph Scale
...
... 36
Scrolling the Bar-graph ...
... 36
Input Display ...
... 37
Printouts ...
... 37
GRAPH Display Mode
...
38
Cursor Function
...
... 39
Y-Scaling ...
... 39
ZOOM ...
... 39
SCROLL
...
... 40
X-Scaling ...
... 40
GRAPH
Printouts ...
... 41
Store & Recall Graphs
...
... 41
SCOPE Display
Mode ...
42
Printouts ...
... 43
Overview
...
43
5. M EASUREMENT FUNCTIONS
...
44
Level Function
...
44
Mono / Stereo Measurements
...
44
Units
...
44
Filters ...
45
Applications ...
46
Overview
...
46
Level Relative
Function ...
47
Filters ...
47
Units
...
48
Application
Example ...
... 48
Signal -to -Noise
Measurement ...
48
THD+N Function
...
49
Notch
Filter ...
50
Additional
Filters ...
50
Units
...
50
SINAD
Measurement ...
51
IMD Function
...
52
Standards
...
53
Unit ...
54
Filters ...
54
Applications ...
54
Noise Function
...
55
Units
...
55
Filters ...
55
Applications ...
56
Noise Relative Function
...
57
Units
...
57
Filters ...
57
Crosstalk Function
...
59
Units
...
59
Filters ...
59
External
Source ...
... 60
Level Selective
Function ...
61
Filters ...
61
V3.1
7 / 104
User Manual
A2 Audio Test & Measurement System
External
Source ...
... 62
Units
... Applications ... Wow
& Flutter
Function ... Standards
... W&F
Measurements (Replay
only) ... W
& F Measurements (Record to Replay)
... W&F
Signal
Analysis ... Phase
Function ... Applications ... Filter
Overview
... ADDITIONAL
Function
... 6.
SWEEPS
... Preparing
a
Sweep ... Selecting
the Sweep
Mode ... Setting
the Sweep Limits & Resolution
... Performing
a
Sweep ... Synchronization
(Internal /
External) ... Sweep
Recording ... Keep
a Recorded
Trace ... Store
& Recall Sweeps
... Sweep
Modes ... Frequency
Sweep ... Y-Axis
Units and Scaling ...
... 73
Re-Scaling of the Frequency Axis
...
... 73
Frequency Sweeps in Different Measurement Modes
... 74
Graphics
Cursor ...
... 74
Tape Sweep
... Recording
a Tape Sweep
...
... 75
External
Sweep ... Preparing
an External Sweep
...
... 77
List of Reference CD Tracks
... 78
Stepped Sweeps ...
... 78
Gliding
Sweeps ...
... 78
Amplitude
Sweep ... Units
of X- / Y -axis ...
... 79
Time Sweep
... Table
Sweep ... Sweep
Data Upload to a PC
... 7.
PRINTOUTS
... Printer
Driver
Selection ... Printer
Settings
... EPSON
FX-80, IBM Proprinter
... EPSON
LQ-550 / LQ-1050
... hp
Laserjet, Deskjet
... Printer
Error ... 8.
I NSTRUMENT SETUP
... Store
& Recall Setups
... Calibration ... Connector
Pin
Assignment ... Centronics
Connector ...
Timing Diagram
...
... 87
RS232 Connector
...
87
Cable ...
... 88
9. OPTIONS & Accessories
...
89
Options
Overview ...
89
RS232 Serial Interface (AO1 /
AO16) ...
90
Baudrate Selection ...
... 90
Filter
Options ...
91
A-Weighting Filter
(AO4) ...
.91
User Filter (AO5) ...
... 92
C- Message Filter (AO13) ...
... 93
80kHz Lowpass Filter (AO14)
...
... 94
Transformer Option
(AO7) ...
95
Phantom Power
(AO8) ...
95
Accessories Overview
...
95
10. TECHNICAL SPECIFICATIONS
...
96
Analog
Generator ...
96
Digital Generator
...
96
Sweep Function
...
96
Analog
Analyzer ...
96
Digital
Analyzer ...
97
Level Function
...
97
Total Harmonic Distortion (THD +
N) ...
97
Phase ...
97
IMD
...
97
Crosstalk / Level Selective
...
98
Noise ...
98
Wow & Flutter
Function ...
98
Drift
...
98
Frequency
Function ...
98
Scope
Function ...
98
Filters
...
99
Display (of A2/A2
-D) ...
99
Interfaces
...
99
General Data
...
99
11. I
NDEX ... 100