General Information
Section 1
1-1
SECTION I
GENERAL INFORMATION
1-1. INTRODUCTION.
1-2.
This instruction manual provides installation, oper-
ating and maintenance instructions, theory of operation,
schematics and parts lists for the Model 1121A Audio
Analyzer.
1-3. DESCRIPTION.
1-4.
The Model 1121A is a versatile, precision, solid-state
instrument with features and performance characteristics
especially suited to laboratory and industrial applications.
Human engineering considerations have been empha-
sized in both the mechanical and electrical design of the
Model 1121A. The result is an audio analyzer that is
easy and convenient to use. Among the outstanding
features are:
a.
Versatile Audio Analyzer.
Advanced generation
and measurement techniques enable the Model 1121A to
provide fast, accurate measurements. Measurement
modes include frequency, AC or DC level, distortion,
SINAD, signal-to-noise and full ratiometric capability. The
precision audio source provides accurate, low distortion
signals over wide frequency and level ranges.
Demanding applications are satisfied by the high output
power capability and selectable output impedance.
b.
Ultra-low Distortion.
The mark of quality for any
audio analyzer is low residual distortion and noise. The
total harmonic distortion of the Model 1121A is specified
as less than 0.01% with typical performance an order of
magnitude better than specified.
c.
Versatile Source Output.
The Model 1121A fea
tures wide control over its output configurations. Source
impedance can be set to 50, 150, or 600 ohms in either a
floating or single-ended configuration. All source imped-
ances are available at the same set of output connectors,
eliminating the need to multiplex separate 50 ohm and
high impedance outputs.
d.
Balanced Input.
The Model 1121A has a fully
differential/balanced input for testing bridged amplifiers
and power supplies.
e.
Separate Displays of All Functions.
The Model
1121A has 3 separate display windows to simultaneously
present analyzer measurements, source settings and
program number or bus address information.
Continuous display of IEEE-488 bus status is also
presented.
f.
Full Range of Filter Selections.
The Model
1121A provides a wide range of filter selections and
weighting characteristics for industry-standard audio
measurements.
g.
Sweep Operation.
Frequency or level can be
swept in user-selected linear or logarithmic steps over
any portion of the range. The selected analyzer mea-
surement provides the Y axis information. Rear panel X
axis, Y axis and PEN outputs are provided for plotter
application.
h.
Instrument Setup Memory.
Up to 99 front
panel setups containing all data required to configure the
instrument to a previous operating mode can be stored in
non-volatile memory for future recall. The last valid
instrument setup before power interruption is also saved
automatically and restored when power is resumed.
i.
IEEE-488 Interface Bus.
All instrument functions
are programmable except line on/off. Annunciators to
the left of the BUS/PRGM display window show the status
of bus activity. The 1121A is designed to interface easily
with controllers currently in use. A versatile free-form
number entry system is used so that the 1121A will
accept any conceivable valid number string. Triggering
may be performed in immediate or wait modes. There
are six talk modes which can be addressed in either the
remote or local state. The 1121A also provides a choice
of several end-of-string terminators. Service-request
(SRQ) can be asserted on errors or using the front panel
SRQ key and the LCL/INIT key will force return to local
control when using the bus as long as a lockout message
has not been sent.
1-5. ACCESSORIES.
1-6.
The available accessories are listed in Table 1-1. The
AC power cord, spare input, output and line fuses are
supplied with the instrument.
1-7. OPTIONS.
1-8.
The available options are listed in Table 1-1.
1-9. SPECIFICATIONS.
1-10.
Performance specifications for the Model 1121A
Audio Analyzer are listed in Table 1-1.
Содержание 1121A
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Страница 21: ...Installation Section 2 2 3 Figure 2 1 Packing and Unpacking Diagram ...
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Страница 24: ...Section 3 Operation 3 2 Figure 3 1 Model 1121A Front View Figure 3 2 Model 1121A Rear View ...
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Страница 37: ...Operation Section 3 3 15 TABLE 3 9 ERROR CODES ...
Страница 38: ...Section 3 Operation 3 16 TABLE 3 8 OPTION SWITCH A4S1 ...
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Страница 64: ...Section 5 Maintenance 5 2 ...
Страница 71: ...Maintenance Section 5 5 9 TABLE 5 3 ANALYZER DC LEVEL ACCURACY TEST RECORD ...
Страница 73: ...Maintenance Section 5 5 11 TABLE 5 4 ANALYZER AC LEVEL ACCURACY TEST RECORD ...
Страница 74: ...Section 5 Maintenance 5 12 TABLE 5 5 ANALYZER AC LEVEL FLATNESS TEST RECORD ...
Страница 76: ...Section 5 Maintenance 5 14 TABLE 5 9 SOURCE LOW LEVEL ACCURACY TEST RECORD ...
Страница 77: ...Maintenance Section 5 5 15 TABLE 5 12 FILTER ACCURACY TEST RECORD ...
Страница 78: ...Section 5 Maintenance 5 16 TABLE 5 14 RESIDUAL SIGNAL TO NOISE TEST RECORD ...
Страница 79: ...Maintenance Section 5 5 17 ...
Страница 80: ...Section 5 Maintenance 5 18 TABLE 5 17 CCIR FILTER ACCURACY TEST RECORD ...
Страница 81: ...Maintenance Section 5 5 19 TABLE 5 18 A WEIGHTING FILTER ACCURACY TEST RECORD ...
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Страница 83: ...Maintenance Section 5 5 21 ...
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Страница 90: ...Section 5 Maintenance 5 28 TABLE 5 23 DIAGNOSTIC ERROR CODE DESCRIPTION ...
Страница 92: ...Section 6 Parts List 6 2 Figure 6 1 Model 1121A Programmable Audio Analyzer ...
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Страница 94: ...Section 6 Parts List 6 4 Figure 6 2 1121A Frame Assy Sheet 1 of 2 ...
Страница 95: ...Parts List Section 6 6 5 Figure 6 2 1121A Frame Assy Sheet 2 of 2 ...
Страница 97: ...Parts List Section 6 6 7 Figure 6 3 PWA 1121A Input A0 ...
Страница 100: ...Section 6 Parts List 6 10 Figure 6 4 PWA 1121A Main Filter A1 ...
Страница 102: ...Section 6 Parts List 6 12 Figure 6 5 PWA 1121A Notch A2 ...
Страница 105: ...Parts List Section 6 6 15 Figure 6 6 PWA 1121A Detector A3 ...
Страница 109: ...Parts List Section 6 6 19 Figure 6 7 PWA 1121A Freq Counter ...
Страница 111: ...Parts List Section 6 6 21 Figure 6 8 PWA 1121A CPU A5 ...
Страница 113: ...Parts List Section 6 6 23 Figure 6 9 PWA 1121A Source A6 ...
Страница 114: ...Section 6 Parts List 6 24 ...
Страница 115: ...Parts List Section 6 6 25 ...
Страница 116: ...Section 6 Parts List 6 26 Figure 6 10 PWA 1121A Output A7 ...
Страница 119: ...Parts List Section 6 6 29 Figure 6 11 Front Bezel Assy A17 ...
Страница 120: ...Section 6 Parts List 6 30 Figure 6 12 PWA 1121A Keyboard A13 ...
Страница 122: ...Section 6 Parts List 6 32 Figure 6 13 Bezel Sub Assy ...
Страница 123: ...Parts List Section 6 6 33 Figure 6 14 PWA 1121A Display A12 ...
Страница 126: ...Section 6 Parts List 6 36 Figure 6 15 Front Panel Assy ...
Страница 127: ...Parts List Section 6 6 37 Figure 6 16 Rear Panel Assy A21 Sheet 1 of 2 ...
Страница 128: ...Section 6 Parts List 6 38 Figure 6 16 Rear Panel Assy A21 Sheet 2 of 2 ...
Страница 129: ...Parts List Section 6 6 39 Figure 6 17 Heat Sink Assy A20 ...
Страница 131: ...Parts List Section 6 6 41 Figure 6 18 Power Amplifier A24 ...
Страница 132: ...Section 6 Parts List 6 42 Figure 6 19 Transformer Assy T1 ...
Страница 133: ...Parts List Section 6 6 43 Figure 6 20 1121A Card Cage Assy A18 ...
Страница 134: ...Section 6 Parts List 6 44 Figure 6 21 PWA 1121A Mother A10 ...
Страница 137: ...Parts List Section 6 6 47 Figure 6 22 PWA 400 Hz High Pass Filter ...
Страница 138: ...Section 6 Parts List 6 48 ...
Страница 139: ...Schematic Diagrams Section 7 7 1 SECTION VII SCHEMATIC DIAGRAMS TABLE 7 1 LIST OF SCHEMATICS ...
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Страница 141: ...Schematic Diagrams Section 7 7 3 Figure 7 1 Main Frame Schematic ...
Страница 142: ...Section 7 Schematic Diagrams 7 4 Figure 7 2 Input Board A0 Parts Location Diagram ...
Страница 143: ...Schematic Diagrams Section 7 7 5 Figure 7 3 Input Board A0 Schematic ...
Страница 144: ...Section 7 Schematic Diagrams 7 6 Figure 7 4 Filter Board A1 Parts Location Diagram ...
Страница 145: ...Schematic Diagrams Section 7 7 7 Figure 7 5 Filter Board A1 Schematic ...
Страница 146: ...Section 7 Schematic Diagrams 7 8 Figure 7 6 Notch Board A2 Parts Location Diagram ...
Страница 147: ...Schematic Diagrams Section 7 7 9 Figure 7 7 Notch Board A2 1Schematic ...
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Страница 149: ...Schematic Diagrams Section 7 7 11 Figure 7 8 Notch Board A2 2 Schematic ...
Страница 150: ...Section 7 Schematic Diagrams 7 12 Figure 7 9 Detector Board A3 Parts Location Diagram ...
Страница 151: ...Schematic Diagrams Section 7 7 13 Figure 7 10 Detector Board A3 1 Schematic Figure 7 11 Detector Board A3 2 Schematic ...
Страница 152: ...Section 7 Schematic Diagrams 7 14 Figure 7 12 Counter Board A4 Parts Location Diagram ...
Страница 153: ...Schematic Diagrams Section 7 7 15 Figure 7 13 Counter Board A4 Schematic ...
Страница 154: ...Section 7 Schematic Diagrams 7 16 Figure 7 14 C P U Board A5 Parts Location Diagram ...
Страница 155: ...Schematic Diagrams Section 7 7 17 Figure 7 15 C P U Board A5 Schematic ...
Страница 156: ...Section 7 Schematic Diagrams 7 18 Figure 7 16 Source Board A6 Parts Location Diagram ...
Страница 157: ...Schematic Diagrams Section 7 7 19 Figure 7 17 Source Board A6 1 Schematic ...
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Страница 159: ...Schematic Diagrams Section 7 7 21 Figure 7 18 Source Board A6 2 Schematic ...
Страница 160: ...Section 7 Schematic Diagrams 7 22 Figure 7 19 Output Board A7 Parts Location Diagram ...
Страница 161: ...Schematic Diagrams Section 7 7 23 Figure 7 20 Output Board A7 Schematic ...
Страница 162: ...Section 7 Schematic Diagrams 7 24 Figure 7 21 Mother Board A10 Parts Location Diagram ...
Страница 163: ...Schematic Diagrams Section 7 7 25 Figure 7 22 Mother Board A10 Schematic ...
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Страница 165: ...Schematic Diagrams Section 7 7 27 Figure 7 25 Power Supply A11 2 Schematic ...
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Страница 167: ...Schematic Diagrams Section 7 7 29 ...
Страница 168: ...Section 7 Schematic Diagrams 7 30 Figure 7 26 Display Board A12 Parts Location Diagram ...
Страница 169: ...Schematic Diagrams Section 7 7 31 Figure 7 27 Display Board A12 Schematic Sheet 1 ...
Страница 170: ...Section 7 Schematic Diagrams 7 32 Figure 7 28 Key Board A13 Parts Location Diagram ...
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Страница 176: ...Section 7 Schematic Diagrams 7 38 Figure 7 35 CCITT Board A1A31 Schematic ...
