Section 5
Maintenance
5-10
5-44. 400 Hz High-Pass Filter Accuracy.
Perform the
test as follows:
a. Set the Source to a frequency of 1 kHz and a level
of 2 volts.
b. Enable the Analyzer level ratio mode and depress
the dB key.
c. Enter special function 12 to hold the 1.5 volt input
range.
d. Enable the 400 Hz high-pass filter and adjust the
Source frequency for an ANALYZER display indication of
-3.01 dB ± 0.05 dB.
e. Check the frequency against the specified limits
and record the result, pass or fail, in Table 5-12.
5-45. AUDIO Band-Pass Filter Accuracy.
Refer to
paragraph 5-43 for the test connections and perform the
test as follows:
a. Set the Source to a frequency of 1 kHz and a level
of 2 volts.
b. Enable the Analyzer level ratio mode and depress
the dB key.
c. Enter special function 12 to hold the 1.5 volt input
range.
d. Enable the AUDIO band-pass filter and set the
Source frequency to 22.4 Hz and fine adjust the
frequency for an ANALYZER display indication of -3.01
dB ± 0.05dB.
e. Check the frequency against the specified limits
and record the result, pass or fail, in Table 5-12.
f. Set the Source frequency to 22.4 kHz and fine
adjust the frequency for an ANALYZER display indication
of -3.01 dB ± 0.05 dB.
g. Check the frequency against the specified limits
and record the result, pass or fail, in Tble 5-12.
5-46. CCITT Filter Accuracy.
Refer to paragraph 5-43
for the test connections and perform the test as follows:
a. Set the Source to a frequency of 800 Hz and a
level of 2 volts.
b. Enable the Analyzer level ratio mode and de-
press the dB key.
c. Enter special function 12 to hold the 1.5 volt input
range and special function 71 to select the average
detector.
d. Enable the CCIR band-pass filter and set the
Source to the frequencies listed in Table 5-16 and record
the results, pass or fail.
5-47. CCIR Filter Accuracy.
Refer to paragraph 5-43
for the test connections and perform the test as follows:
a. Set the Source to a frequency of 2000 Hz and a
level of 2 volts.
b. Enable the Analyzer level ratio mode and de-
press the dB key.
c. Enter special function 12 to hold the 1.5 volt input
range and special function 71 to select the average
detector.
d. Enable the CCIR band-pass filter and set the
Source to the frequencies listed in Table 5-17 and record
the results, pass or fail.
5-48. A, B, and C Weighting Filter Accuracy.
Refer to
paragraph 5-43 for the test conditions and perform the
test as follows:
Set the Source to a frequency of 1000 Hz and a level of 2
volts.
Enable the Analyzer level ratio mode and depress the dB
key.
Enter special function 12 to hold the 1.5 volt input range.
d. Enable the A, B, or C Weighting filter and set
the Source to the frequencies listed in Table 5-18, 5-19
or 5-20 for the respective A, B, or C weighting filter and
record the results, pass or fail.
5-49. C-MESSAGE Filter Accuracy.
Refer to
paragraph 5-43 for the test connections and perform the
test as follows:
Set the Source to a frequency of 1000 Hz and a level of 2
volts.
Enable the Analyzer level ratio mode and depress the dB
key.
d. Enable the C-MESSAGE weighting filter and set the
Source to the frequencies listed in Table 5-21 and record
the result, pass or fail.
Summary of Contents for 1121A
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Page 12: ...VIII MODEL 1121A AUDIO ANALYZER ...
Page 18: ...Section 1 General Information 1 6 This page intentionally blank ...
Page 21: ...Installation Section 2 2 3 Figure 2 1 Packing and Unpacking Diagram ...
Page 22: ...Section 2 Installation 2 4 This page intentionally blank ...
Page 24: ...Section 3 Operation 3 2 Figure 3 1 Model 1121A Front View Figure 3 2 Model 1121A Rear View ...
Page 25: ...Operation Section 3 3 3 ...
Page 26: ...Section 3 Operation 3 4 ...
Page 27: ...Operation Section 3 3 5 ...
Page 30: ...Section 3 Operation 3 8 ...
Page 37: ...Operation Section 3 3 15 TABLE 3 9 ERROR CODES ...
Page 38: ...Section 3 Operation 3 16 TABLE 3 8 OPTION SWITCH A4S1 ...
Page 39: ...Operation Section 3 3 17 TABLE 3 9 ERROR CODES ...
Page 41: ...Operation Section 3 3 19 ...
Page 42: ...Section 3 Operation 3 20 ...
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Page 50: ...Section 4 Theory of Operation 4 4 Figure 4 3 CPU Circuits Block Diagram ...
Page 62: ...Section 4 Theory of Operation 4 16 This page intentionally blank ...
Page 64: ...Section 5 Maintenance 5 2 ...
Page 71: ...Maintenance Section 5 5 9 TABLE 5 3 ANALYZER DC LEVEL ACCURACY TEST RECORD ...
Page 73: ...Maintenance Section 5 5 11 TABLE 5 4 ANALYZER AC LEVEL ACCURACY TEST RECORD ...
Page 74: ...Section 5 Maintenance 5 12 TABLE 5 5 ANALYZER AC LEVEL FLATNESS TEST RECORD ...
Page 76: ...Section 5 Maintenance 5 14 TABLE 5 9 SOURCE LOW LEVEL ACCURACY TEST RECORD ...
Page 77: ...Maintenance Section 5 5 15 TABLE 5 12 FILTER ACCURACY TEST RECORD ...
Page 78: ...Section 5 Maintenance 5 16 TABLE 5 14 RESIDUAL SIGNAL TO NOISE TEST RECORD ...
Page 79: ...Maintenance Section 5 5 17 ...
Page 80: ...Section 5 Maintenance 5 18 TABLE 5 17 CCIR FILTER ACCURACY TEST RECORD ...
Page 81: ...Maintenance Section 5 5 19 TABLE 5 18 A WEIGHTING FILTER ACCURACY TEST RECORD ...
Page 82: ...Section 5 Maintenance 5 20 ...
Page 83: ...Maintenance Section 5 5 21 ...
Page 84: ...Section 5 Maintenance 5 22 ...
Page 90: ...Section 5 Maintenance 5 28 TABLE 5 23 DIAGNOSTIC ERROR CODE DESCRIPTION ...
Page 92: ...Section 6 Parts List 6 2 Figure 6 1 Model 1121A Programmable Audio Analyzer ...
Page 93: ...Parts List Section 6 6 3 ...
Page 94: ...Section 6 Parts List 6 4 Figure 6 2 1121A Frame Assy Sheet 1 of 2 ...
Page 95: ...Parts List Section 6 6 5 Figure 6 2 1121A Frame Assy Sheet 2 of 2 ...
Page 97: ...Parts List Section 6 6 7 Figure 6 3 PWA 1121A Input A0 ...
Page 100: ...Section 6 Parts List 6 10 Figure 6 4 PWA 1121A Main Filter A1 ...
Page 102: ...Section 6 Parts List 6 12 Figure 6 5 PWA 1121A Notch A2 ...
Page 105: ...Parts List Section 6 6 15 Figure 6 6 PWA 1121A Detector A3 ...
Page 109: ...Parts List Section 6 6 19 Figure 6 7 PWA 1121A Freq Counter ...
Page 111: ...Parts List Section 6 6 21 Figure 6 8 PWA 1121A CPU A5 ...
Page 113: ...Parts List Section 6 6 23 Figure 6 9 PWA 1121A Source A6 ...
Page 114: ...Section 6 Parts List 6 24 ...
Page 115: ...Parts List Section 6 6 25 ...
Page 116: ...Section 6 Parts List 6 26 Figure 6 10 PWA 1121A Output A7 ...
Page 119: ...Parts List Section 6 6 29 Figure 6 11 Front Bezel Assy A17 ...
Page 120: ...Section 6 Parts List 6 30 Figure 6 12 PWA 1121A Keyboard A13 ...
Page 122: ...Section 6 Parts List 6 32 Figure 6 13 Bezel Sub Assy ...
Page 123: ...Parts List Section 6 6 33 Figure 6 14 PWA 1121A Display A12 ...
Page 126: ...Section 6 Parts List 6 36 Figure 6 15 Front Panel Assy ...
Page 127: ...Parts List Section 6 6 37 Figure 6 16 Rear Panel Assy A21 Sheet 1 of 2 ...
Page 128: ...Section 6 Parts List 6 38 Figure 6 16 Rear Panel Assy A21 Sheet 2 of 2 ...
Page 129: ...Parts List Section 6 6 39 Figure 6 17 Heat Sink Assy A20 ...
Page 131: ...Parts List Section 6 6 41 Figure 6 18 Power Amplifier A24 ...
Page 132: ...Section 6 Parts List 6 42 Figure 6 19 Transformer Assy T1 ...
Page 133: ...Parts List Section 6 6 43 Figure 6 20 1121A Card Cage Assy A18 ...
Page 134: ...Section 6 Parts List 6 44 Figure 6 21 PWA 1121A Mother A10 ...
Page 137: ...Parts List Section 6 6 47 Figure 6 22 PWA 400 Hz High Pass Filter ...
Page 138: ...Section 6 Parts List 6 48 ...
Page 139: ...Schematic Diagrams Section 7 7 1 SECTION VII SCHEMATIC DIAGRAMS TABLE 7 1 LIST OF SCHEMATICS ...
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Page 141: ...Schematic Diagrams Section 7 7 3 Figure 7 1 Main Frame Schematic ...
Page 142: ...Section 7 Schematic Diagrams 7 4 Figure 7 2 Input Board A0 Parts Location Diagram ...
Page 143: ...Schematic Diagrams Section 7 7 5 Figure 7 3 Input Board A0 Schematic ...
Page 144: ...Section 7 Schematic Diagrams 7 6 Figure 7 4 Filter Board A1 Parts Location Diagram ...
Page 145: ...Schematic Diagrams Section 7 7 7 Figure 7 5 Filter Board A1 Schematic ...
Page 146: ...Section 7 Schematic Diagrams 7 8 Figure 7 6 Notch Board A2 Parts Location Diagram ...
Page 147: ...Schematic Diagrams Section 7 7 9 Figure 7 7 Notch Board A2 1Schematic ...
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Page 149: ...Schematic Diagrams Section 7 7 11 Figure 7 8 Notch Board A2 2 Schematic ...
Page 150: ...Section 7 Schematic Diagrams 7 12 Figure 7 9 Detector Board A3 Parts Location Diagram ...
Page 152: ...Section 7 Schematic Diagrams 7 14 Figure 7 12 Counter Board A4 Parts Location Diagram ...
Page 153: ...Schematic Diagrams Section 7 7 15 Figure 7 13 Counter Board A4 Schematic ...
Page 154: ...Section 7 Schematic Diagrams 7 16 Figure 7 14 C P U Board A5 Parts Location Diagram ...
Page 155: ...Schematic Diagrams Section 7 7 17 Figure 7 15 C P U Board A5 Schematic ...
Page 156: ...Section 7 Schematic Diagrams 7 18 Figure 7 16 Source Board A6 Parts Location Diagram ...
Page 157: ...Schematic Diagrams Section 7 7 19 Figure 7 17 Source Board A6 1 Schematic ...
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Page 159: ...Schematic Diagrams Section 7 7 21 Figure 7 18 Source Board A6 2 Schematic ...
Page 160: ...Section 7 Schematic Diagrams 7 22 Figure 7 19 Output Board A7 Parts Location Diagram ...
Page 161: ...Schematic Diagrams Section 7 7 23 Figure 7 20 Output Board A7 Schematic ...
Page 162: ...Section 7 Schematic Diagrams 7 24 Figure 7 21 Mother Board A10 Parts Location Diagram ...
Page 163: ...Schematic Diagrams Section 7 7 25 Figure 7 22 Mother Board A10 Schematic ...
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Page 165: ...Schematic Diagrams Section 7 7 27 Figure 7 25 Power Supply A11 2 Schematic ...
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Page 167: ...Schematic Diagrams Section 7 7 29 ...
Page 168: ...Section 7 Schematic Diagrams 7 30 Figure 7 26 Display Board A12 Parts Location Diagram ...
Page 169: ...Schematic Diagrams Section 7 7 31 Figure 7 27 Display Board A12 Schematic Sheet 1 ...
Page 170: ...Section 7 Schematic Diagrams 7 32 Figure 7 28 Key Board A13 Parts Location Diagram ...
Page 171: ...Schematic Diagrams Section 7 7 33 ...
Page 172: ...Section 7 Schematic Diagrams 7 34 ...
Page 173: ...Schematic Diagrams Section 7 7 35 ...
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Page 176: ...Section 7 Schematic Diagrams 7 38 Figure 7 35 CCITT Board A1A31 Schematic ...
