IFR COM-120B User manual

MAINTENANCE
MANUAL
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COMMUNICATION SERUICE MONITOR
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10200 West York Street / Wichita, Kansas 67215 U.S.A. / (316) 5224981/ FAX [phone]
1002-060G,300
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MAINTENANCE
MANUAL
COM -1208
COMMUNICATION SERVICE MONITOR
--
--
10200 West York Street / Wichita, Kansas 67215 U.S.A. / [phone] / FAX [phone]
1002-0600-300

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PUBLISHED BY
IFR SYSTEMS INC
WICHITA, KANSAS
COPYRIGHT @ 1996 by IFR SYSTEMS, lNC.
All rights reserved. Printed in the United States of America. No part of this
publication may be reproduced, stored in a retrieval system, or transmitted in any form
or by any means, electronic, mechanical, photocopying, recording or otherwise without
the prior permission of the publisher.
PUBLISHED BY
IFR SYSTEMS INC
WICHITA, KANSAS
COPYRIGHT © 1996 by IFR SYSTEMS, INC.
All rights reserved. Printed in the United States of America. No part of this
publication may be reproduced, stored in a retrieval system, or transmitted in any form
or by any means, electronic, mechanical, photocopying, recording or otherwise without
the prior permission of the publisher.

TABLE OF CONTENTS
SECTION .1 - CALIBRATION
1-1 GENERAL
1-1-1 SAFETY PRECAUTIONS
1-1-2 ESD PRECAUTIONS
1-2 TEST EQUIPMENT REQUIREMENTS
1-3 DISASSEMBLYREQUIREMENTS
1.4 CALIBRATION ADJUSTMENTS
1-5 CONTROLS, CONNECTORS AND INDICATORS
1-6 COMPLETION OF CALIBRATION TEST PROCEDURES
1-7 CALIBRATION RECORD
1.8 CALIBRATIONPROCEDURES
1-8-1 POWER SUPPLY CALIBRAT]ON
1-8-2 TCXO/OCXOCALIBRATION
1-8-3 DVM CALIBRATION
1-8-4 GENERATOR OUTPUT LEVEL CALIBRATION
1-8.5 DISTORTIONMETERCALIBRATION
1-8-6 SINAD METER CALIBRATION
1.8-7 RF GENERATE FM DEVIAT]ON CALIBRATION
1.8.8 RF GENERATE PM DEVIATION CALIBRATION
1-8-9 RF GENERATE AM MODULATION CALIBRATION
1-8-10 RF GENERATE EXTERNAL MODULATION CALIBRATION
1-8-11 SPECTRUM ANALYZER CALIBRATION
1-8-12 MIXER NULL CALIBRATION
1-8-13 FM DEVIATION METER CALIBRAT]ON
1-8-14 PM DEVIATION METER CALIBRATION
1.8.15 AM MODULATION METER CALIBRATION
1.8.16 POWER METER CALIBRATION
SECTION 2 - PC BOARDS AND SCHEMATICS
PRODUCT STRUCTURE 1ST LO ASSEMBLY
INTERCONNECT DIAGRAM 2ND LO ASSEMBLY
COMPOSITE ASSEMBLY 3RD LO ASSEMBLY
CASE ASSEMBLY BASE BAND ASSEMBLY
LID ASSEMBLY GENERATOR TRAY
FRONT PANEL ASSEMBLY AM FM MODULATOR ASSEMBLY
KEYBOARD CONTROLLER ASSEMBLY GEN CONVERTER ASSEMBLY
AUDIO BOARD ASSEMBLY ANALYZER ASSEMBLY
EL D]SPLAY INTERFACE ASSEMBLY POWER SUPPLY ASSEMBLY
ATTENUATOR CONTROL ASSEMBLY REFERENCE FREQ. STD.
POWER TERMINATION ASSEMBLY RECEIVER TRAY STD.
GENERATOR OUTPUT ASSEMBLY FRONT END BLOCK
MOTHERBOARD ASSEMBLY IF AMP/DEMOD ASSEMBLY
PCMCIA INTERFACE ASSEMBLY RECEIVER TRAY OPT. 03
VIDEO CNTR/FCTN GEN ASSEMBLY DIGITAL TRAY OPT. 04
CONTROLLER TRAY AUXILIARY AMP OPT. 05
SYNTHESIZER TRAY RECEIVER TRAY OPT. 08
TABLE OF CONTENTS
SECTION 1 - CALIBRATION
1-1 GENERAL
1-1-1 SAFETY PRECAUTIONS
1-1-2 ESD PRECAUTIONS
1-2 TEST EQUIPMENT REQUIREMENTS
1-3 DISASSEMBLY REQUIREMENTS
1-4 CALIBRATION ADJUSTMENTS
1-5 CONTROLS, CONNECTORS AND INDICATORS
1-6 COMPLETION OF CALIBRATION TEST PROCEDURES
1-7 CALIBRATION RECORD
1-8 CALIBRATION PROCEDURES
1 -8-1
1-8-2
1-8-3
1-8-4
1-8-5
1-8-6
1-8-7
1-8-8
1-8-9
1-8-10
1 -8-11
1 -8-12
1-8-13
1 -8-14
1 -8-15
1-8-16
POWER SUPPLY CALIBRATION
TCXOIOCXO CALIBRATION
DVM CALIBRATION
GENERATOR OUTPUT LEVEL CALIBRATION
DISTORTION METER CALIBRATION
SINAD METER CALIBRATION
RF GENERATE FM DEVIATION CALIBRATION
RF GENERATE PM DEVIATION CALIBRATION
RF GENERATE AM MODULATION CALIBRATION
RF GENERATE EXTERNAL MODULATION CALIBRATION
SPECTRUM ANALYZER CALIBRATION
MIXER NULL CALIBRATION
FM DEVIATION METER CALIBRATION
PM DEVIATION METER CALIBRATION
AM MODULATION METER CALIBRATION
POWER METER CALIBRATION
SECTION 2 - PC BOARDS AND SCHEMATICS
PRODUCT STRUCTURE
INTERCONNECT DIAGRAM
COMPOSITE ASSEMBLY
CASE ASSEMBLY
LID ASSEMBLY
FRONT PANEL ASSEMBLY
KEYBOARD CONTROLLER ASSEMBLY
AUDIO BOARD ASSEMBLY
EL DISPLAY INTERFACE ASSEMBLY
ATTENUATOR CONTROL ASSEMBLY
POWER TERMINATION ASSEMBLY
GENERATOR OUTPUT ASSEMBLY
MOTHERBOARD ASSEMBLY
PCMCIA INTERFACE ASSEMBLY
VIDEO CNTR/FCTN GEN ASSEMBLY
CONTROLLER TRAY
SYNTHESIZER TRAY
1 ST LO ASSEMBLY
2ND LO ASSEMBLY
3RD LO ASSEMBLY
BASE BAND ASSEMBLY
GENERATOR TRAY
AM FM MODULATOR ASSEMBLY
GEN CONVERTER ASSEMBLY
ANALYZER ASSEMBLY
POWER SUPPLY ASSEMBLY
REFERENCE FREQ. STD.
RECEIVER TRAY STD.
FRONT END BLOCK
IF AMPIDEMOD ASSEMBLY
RECEIVER TRAY OPT. 03
DIGITAL TRAY OPT. 04
AUXILIARY AMP OPT. 05
RECEIVER TRAY OPT. 08
Scans by ArtekMedia © 2008

SECTION 1 . CALIBRATION
1 .1 G EN ERAL
This section contains calibration procedures for the following assemblies and systems:
PARA TITLE PAGE
1-8-1
1-8-2
1-8-3
1-B-4
1-8-5
1-8-6
1-8-7
1-8-8
1-8-9
1-8-10
1-8-1 1
1-8-12
1-8-13
1-8-14
1-8-15
1-8-16
These
POWER SUPPLY CALIBRATlON
TCXO/OCXO CALIBRATION
DVM CALIBRATION
GENERATOR OUTPUT LEVEL CALIBRATION
DISTORTION METER CALlBRATION
SINAD METER CALIBRATION
RF GENERATE FM DEVIATION CALIBRAT]ON
RF GENERATE PM DEVIATION CALIBRAT]ON
RF GENERATE AM MODULATION CALIBRATION
RF GENERATE EXTERNAL MODULATION CALIBRATION
SPECTRUM ANALYZER CALIBRATION
MIXER NULL CALIBRATION
FM DEVIATION METER CALIBRATION
PM DEVIATION METER CALIBRATION
AM MODULATION METER CALIBRATION
POWER METER CALIBRATION
1-5
1-7
1-9
1-1 1
1-14
1-16
1-18
1-21
1-23
1-25
1-29
1-36
1-38
1-41
1-43
1-45
procedures should be performed as a result of one or more of the following conditions:
O lf, during the course of normal operation, the COM-1208 or any major function thereof
fails to meet the performance specifications.
O lf a module is found to be defective and requires replacement.
O lf the recommended 12 month calibration interval is due.
Figure 1-1 lists the calibration procedures required based on the replacement of a specific
module. All procedures must be performed for the annual calibration.
1-1-1 SAFETY PRECAUTIONS
As with any piece of electronic equipment, extreme caution should be taken when working with
'live" circuits. When performing the calibration procedures in this section, be sure to observe
the f ollowing precautions:
WARNING: REMOVE ALL JEWELRY BEFORE PERFORMING ANY CALIBRATION
PROCEDURES INVOLVING LIVE CIRCUITS.
HEED ALL WARNINGS AND CAUTIONS CONCERNING MAXIMUM VOLTAGES
AND POWER INPUTS.
1-1
SECTION 1 - CALIBRATION
1-1 GENERAL
This section contains calibration procedures for the following assemblies and systems:
PARA
1-8-1
1-8-2
1-8-3
1-8-4
1-8-5
1-8-6
1-8-7
1-8-8
1-8-9
1-8-10
1 -8-11
1-8-12
1-8-13
1-8-14
1-8-15
1-8-16
TITLE
POWER SUPPLY CALIBRATION
TCXOIOCXO CALIBRATION
DVM CALIBRATION
GENERATOR OUTPUT LEVEL CALIBRATION
DISTORTION METER CALIBRATION
SINAD METER CALIBRATION
RF GENERATE FM DEVIATION CALIBRATION
RF GENERATE PM DEVIATION CALIBRATION
RF GENERATE AM MODULATION CALIBRATION
RF GENERATE EXTERNAL MODULATION CALIBRATION
SPECTRUM ANALYZER CALIBRATION
MIXER NULL CALIBRATION
FM DEVIATION METER CALIBRATION
PM DEVIATION METER CALIBRATION
AM MODULATION METER CALIBRATION
POWER METER CALIBRATION
PAGE
1-5
1-7
1-9
1-11
1-14
1-16
1-18
1-21
1-23
1-25
1-29
1-36
1-38
1-41
1-43
1-45
These procedures should be performed as a result of one or more of the following conditions:
• If, during the course of normal operation, the COM-120B or any major function thereof
fails to meet the performance specifications.
• If a module is found to be defective and requires replacement.
• If the recommended 12 month calibration interval is due.
Figure 1-1 lists the calibration procedures required based on the replacement of a specific
module. All procedures must be performed for the annual calibration.
1-1 -1
SAFETY PRECAUTIONS
As with any piece of electronic equipment, extreme caution should be taken when working with
"live" circuits. When performing the calibration procedures in this section, be sure to observe
the following precautions:
WARNING: REMOVE ALL JEWELRY BEFORE PERFORMING ANY CALIBRATION
PROCEDURES INVOLVING LIVE CIRCUITS.
HEED ALL WARNINGS AND CAUTIONS CONCERNING MAXIMUM VOLTAGES
AND POWER INPUTS.
1 -1

1-1-2 ESD PRECAUTIONS
CAUTION: THESE CALIBRATION PROCEDURES SHOULD ONLY BE PERFORMED lN AN ESD
ENVIRONMENT AND ALL PERSONNEL PERFORMING THIE PROCEDURES
SHOULD KNOW ACCEPTED ESD PRACTICES OR BE ESD CERTIFIED.
fi cAU'oN t?
L.--r \t/
ll
THIS EQUIPMENT CONTAINS PARTS
SENSIT]VE TO DAMAGE
BY ELECTROSTATTC DTSCHARGE (ESD)
1.2 TEST EOUIPMENT REQUIREMENTS
Table 1-1 contains a comprehensive list of test equipment suitable for performing any of the
procedures listed in this manual. Any other equipment meeting the specifications listed in
Table 1-1 may be substituted in place of the recommended models.
NOTE: For certain procedures contained in this manual, the equipment listed in Appendix A may
exceed the minimum required specif ications.
1.3 DISASSEMBLY REQUIREMENTS
To perform the calibration procedures, the case assembly must be removed.
1.4 CALIBRATION ADJUSTMENTS
Before making adjustments, always observe the measurement. lf the measurement is within the
tolerances given, do not proceed with the adjustment. When an adjustment is required, attempt
to obtain a precise measurement, instead of just within tolerance.
1.5 CONTROLS, CONNECTORS AND INDICATORS
The front and rear panel controls, connectors and indicators specified in the calibration
procedures are followed by an item number. Refer to Figures 3-1 and 3-2 in the COM-1208
Operation Manual for the location of these items.
1.6 COMPLETION OF CALIBRATION TEST PROCEDURES
Upon completion of a specific calibration procedure, the calibration procedure may be
terminated. Control settings, operating commands and test equipment do not carry over from
one procedure to another and are not assumed at the beginning of a procedure.
1.7 CALIBRATION RECORD
A Calibration Record is provided for recording the results obtained while performing the
Calibration Procedures. lt is recommended the technician reoroduce the Calibration Record.
rather than use the copy in this manual.
1-2
1-1-2 ESD PRECAUTIONS
CAUTION: THESE CALIBRATION PROCEDURES SHOULD ONLY BE PERFORMED IN AN ESD
ENVIRONMENT AND ALL PERSONNEL PERFORMING THIE PROCEDURES
SHOULD KNOW ACCEPTED ESD PRACTICES OR BE ESD CERTIFIED.
\.~ CAUTION
THIS EQUIPMENT CONTAINS PARTS
SENSITIVE
TO DAMAGE
BY ELECTROSTATIC DISCHARGE (ESD)
1-2 TEST EQUIPMENT REQUIREMENTS
Table 1-1 contains a comprehensive list of test equipment suitable for performing any of the
procedures listed in this manual. Any other equipment meeting the specifications listed in
Table 1-1 may be substituted in place of the recommended models.
NOTE: For certain procedures contained in this manual, the equipment listed in Appendix A may
exceed the minimum required specifications.
1-3 DISASSEMBLY REQUIREMENTS
To perform the calibration procedures, the case assembly must be removed.
1-4 CALIBRATION ADJUSTMENTS
Before making adjustments, always observe the measurement. If the measurement is within the
tolerances given, do not proceed with the adjustment. When an adjustment is required, attempt
to obtain a precise measurement, instead of just within tolerance.
1-5 CONTROLS, CONNECTORS AND INDICATORS
The front and rear panel controls, connectors and indicators specified in the calibration
procedures are followed by an item number. Refer to Figures 3-1 and 3-2 in the COM-120B
Operation Manual for the location of these items.
1-6 COMPLETION OF CALIBRATION TEST PROCEDURES
Upon completion of a specific calibration procedure, the calibration procedure may be
terminated. Control settings, operating commands and test equipment do not carryover from
one procedure to another and are not assumed at the beginning of a procedure.
1-7 CALIBRATION RECORD
A Calibration Record is provided for recording the results obtained while performing the
Calibration Procedures. It is recommended the technician reproduce the Calibration Record,
rather than use the copy in this manual.
1-2
Scans by ArtekMedia © 2008

Type Model Specif icatlons
Digital Multimeter (DMM) HP34401A or equivalent
Calibrator Fluke 5100B or equivalent
Audio Analyzer HP8903B or equivalent Frequency Range:
20 Hz to 20 kHz
Accu racy
r0.1 dB
Frequency Counter Phillips PM6669
or equivalent Frequency:
'lO Hz to 1.3 GHz
Reso lution :
>7 digits
Measuring Receiver
HP8902A (opt. 30, 32,371
or equivalent RF Power:
-20 to +30 dBm
RF Power Range:
.1 to 1 GHz
RF Level:
Tuned 0 to -127 dBm
RF Power Accuracy:
10.1 dB
Measuring Receiver Sensor HP11722A or equivalent
Modulation Analyzer
HP8901A or equivalent FM Meter Range:
20 Hz to 200 kHz
FM Meter Accuracy:
t1% t1 digit
Phase Meter Range:
to 200 Radians
Phase Meter Accuracy:
t3"/" t1 digit
10 MHz Standard Accu racv:
t2 X 10-e
(Traceable to NIST)
COM-120 Maintenance Kit P/N 7001-8743-800
Signal Generator HP8657A or equivalent
10 W RF Amplif ier Amplifier Research
10w1000
or equivalent
Gain:
40 dB Nominal
Bandwidth:
1 MHz to 1 GHz
200 W RF Amplifier ENI 5100L or equivalent Gain:
50 dB Nominal
Bandwidth:
1.5 to 150 MHz
Table 1-1 Test Equipment Requirements
Type
Model
Specifications
Digital Multimeter (DMM) HP34401 A or equivalent
Calibrator Fluke 5100B or equivalent
HP8903B or equivalent Frequency Range:
Audio Analyzer
20 Hz to 20 kHz
Accuracy
±0.1 dB
Phillips PM6669 Frequency:
Frequency Counter
or equivalent
10Hzt01.3GHz
Reso luti on:
~7 digits
HP8902A (opt. 30, 32, 37) RF Power:
or equivalent
-20 to +30 dBm
RF Power Range:
Measuring Receiver
.1t01GHz
RF Level:
Tuned 0 to -127 dBm
RF Power Accuracy:
±0.1 dB
Measuring Receiver Sensor
HP11722A or equivalent
HP8901 A or equivalent FM Meter Range:
20 Hz to 200 kHz
FM Meter Accuracy:
Modulation Analyzer
±1 % ±1 digit
Phase Meter Range:
to 200 Radians
Phase Meter Accuracy:
±3%
±1 digit
Accuracy:
10 MHz Standard
±2 X 10-
9
(Traceable to NIST)
COM-120 Maintenance Kit PIN 7001-8743-800
Signal Generator HP8657A or equivalent
Amplifier Research Gain:
10 W RF Amplifier
10W1000 40 dB Nominal
or equivalent Bandwidth:
1 MHz to 1 GHz
ENI 51 OOL or equivalent Gain:
200 W RF Amplifier
50 dB Nominal
Bandwidth:
1.5t0150MHz
_._- -------~-.---
-. _
... ------- ----
-----~.-
Table 1-1 Test Equipment Requirements
Scans by ArtekMedia © 2008

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1-8-1 1-8-2 1-8-3 1-8-4 1-8-5 1-8-6 1-8-7 1-8-8 1-8-9 1-8-10
1-8-11 1-8-12 1-8-13 1-8-14 1-8-15 1-8-16
•
MOTHERBOARD PC BOARD ASSEMBLY
ATTENUATOR CONTROL PC BOARD ASSEMBLY
f--------
"---
I--------~---
f---------- --------- --
FRONT PANEL ASSEMBLY
DIGITAL TRAY
•
CONTROLLER TRAY
ANAL VZER TRAY
• •
RECEIVER TRAY
• • •
SYNTHESIZER TRAY • • • • • • • • • • • • •
GENERATOR TRAY
• • • • •
POWER TERMINATION ASSEMBLY
•
GENERATOR OUTPUT ASSEMBLY
• • • • •
CONVERTER ASSEMBLY
• • • • • •
REFERENCE FREQUENCY ASSEMBLY
•
FAN ASSEMBLY
POWER SUPPLY ASSEMBLY
• • • • • • • • • • • • • • • •
8702001
Figure 1-1 Module Replacement and Calibration Requirements
•
1-4
Scans by ArtekMedia © 2008

1.8 CALIBRATION PROCEDU RES
1-8-1 POWER SUPPLY CALIBRATION
PREREQUISITES: NONE
EQUIPMENT REOUIRED: 1 Dlc|TAL MULTTMETER (DMM)
FIG URES: 1-2
STEP PROCEDURE
1. Apply Power to COM-12O8. Ailow 30 minute warm-up period.
2. Verify Voltages at Motherboard Connector 87A6J10 per Table 1-2 using DMM. Refer to
Figure 1-2 tor pin locations. Use Chassis f or ground.
Supply Voltage Locatlon
+13 V+13 Vdc (10.25 V) 8746J10 PtN 1.13
+35 V+35 Vdc (t1 V) 87A6J10 PtN 2.14
10.5 V-10.5 Vdc (t0.5 V) 8746J10 PtN 3.15
+10.5 V+10.5 Vdc (10.25 V) 87A6J10 PIN 4.16
+5 V Analog +5 Vdc (+0.2 V/-0.0 V) 87A6J10 PIN 5.17
+5 V Digital +5 Vdc (+0.2 V/-0.0 V) 8746J10 PrN 7,19
+12 V EL +12 Vdc (10.25 V) 87A6J10 PrN 9.21
Table 1-2 Power Supply Voltages and Locations
3. Set COM-1208 to OFF and disconnect test equipment.
1-5
1-8 CALIBRATION PROCEDURES
1-8-1 POWER SUPPLY CALIBRATION
PREREQUISITES:
NONE
EQUIPMENT REQUIRED:
DIGITAL MULTIMETER (DMM)
FIGURES:
1-2
STEP
PROCEDURE
1. Apply Power to COM-120B. Allow 30 minute warm-up period.
2. Verify Voltages at Motherboard Connector 87A6J10 per Table 1-2 using DMM. Refer to
Figure 1-2 for pin locations. Use Chassis for ground.
Supply
Voltage
Location
+13 V +
13 Vdc (±0.25 V)
87A6J10 PIN 1,13
~~------
----,----,
f--~-~-~~--- ~~ - --- -~
-"-~-----
+35 V
+35 Vdc (±1 V)
87A6J10 PIN 2,14
-10.5 V
-10.5 Vdc (±0.5 V)
87A6J10 PIN 3,15
+ 10.5 V
+10.5 Vdc (±0.25 V)
87A6J10 PIN 4,16
+5 V Analog
+5 Vdc (+0.2 V/-O.O V)
87A6J10 PIN 5,17
+5 V Digital
+5 Vdc (+0.2 V/-O.O V)
87A6J10 PIN 7,19
+12VEL
+12 Vdc (±0.25 V)
87A6J10 PIN 9,21
Table 1-2 Power Supply Voltages and Locations
3. Set COM-120B to OFF and disconnect test equipment.
1-5
Scans by ArtekMedia © 2008

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Figure 1-2 Power Supply Voltage Locations (87A0J10)
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Figure 1-2 Power Supply Voltage Locations (87A6J10)
8707009
Scans by ArtekMedia © 2008

1-8-2 TCXO/OCXO CALIBRATION
PREREQUISITES: 1-8-1 POWER SUPPLY CALIBRATION
EOUIPMENT REQUIRED: 1 FREQUENCY COUNTER
FIGURES: 1-3
STE PPROCEDURE
1. Apply Power to COM-1208. Allow 5 minute warm-up period.
2. Connect Frequency Gounter to AUX RF OUT Connector (13).
3. Press GEN Test Mode Key (3) to access RF Generate Operation Screen.
4. Set RF Field to 998.0000 HHz.
5. Set Output to AUX and Output Level to -13 dBm-
6. Set all Modulation Sources to OFF.
7. lf OCXO is installed, go to Step 10.
8. Verify Frequency Counter reads 998.0000 (1199.6 Hz). Adjust 87A16A1R1 as required
(Figure 1-3).
9. Set COM-1208 Power to OFF and disconnect test equipment.
10. lf OCXO is installed, verify Frequency Counter reads 998.0000 (110 Hz). lf not, go to Step
12.
11. Set COM-1208 Power to OFF and disconnect test equipment.
12. Remove Protected Screw from OCXO to access adjustment. Adjust OCXO until Frequency
Counter reads 998.0000 (t10 Hz).
13. Replace Protected Screw, set COM-1208 Power to OFF and disconnect test equipment.
1-7
1-8-2 TCXO/OCXO CALIBRATION
PREREQU IS ITES: 1-8-1 POWER SUPPLY CALIBRATION
EQUIPMENT REQUIRED: FREQUENCY COUNTER
FIGURES: 1-3
STEP PROCEDURE
1. Apply Power to COM-120B. Allow 5 minute warm-up period.
2. Connect Frequency Counter to AUX RF OUT Connector (13).
3. Press GEN Test Mode Key (3) to access RF Generate Operation Screen.
4. Set RF Field to 998.0000 MHz.
5. Set Output to AUX and Output Level to -13 dBm.
6. Set all Modulation Sources to OFF.
7. If OCXO is installed, go to Step 10.
8. Verify Frequency Cou nter reads 998.0000 (±199.6 Hz). Adjust 87 A 16A 1 R1 as required
(Figure 1-3).
9. Set COM-120B Power to OFF and disconnect test equipment.
10. If OCXO is installed, verify Frequency Counter reads 998.0000 (±10 Hz). If not, go to Step
12.
11. Set COM-120B Power to OFF and disconnect test equipment.
12. Remove Protected Screw from OCXO to access adjustment. Adjust OCXO until Frequency
Counter reads 998.0000 (±10 Hz).
13. Replace Protected Screw, set COM-120B Power to OFF and disconnect test equipment.
1- 7
Scans by ArtekMedia © 2008

PROTECTED SCREW
87A1 6A1 R1
Figu re 1 -3 TCXO/OCXO Adjustments
1-B
PROTECTED SCREW
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0 0
0 0 0
0 0
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Figure 1-3 TCXO/OCXO Adjustments
1-8
Scans by ArtekMedia © 2008

1-8-3 DVM CALIBRATION
PREREQUISITES: 1-8-1 POWERSUPPLYCALIBRATTON
EOUIPMENT REQUIRED: 1 CALIBRATOR
FIGURES: NONE
STEP PROCEDURE
1. Apply Power to COM-120B. Allow 5 minute warm-up period.
2. Connect Calibrator to SCOPE/DVM Connector (20).
3. Press MTRS Instruments Key (4).
4. Select "3. DVM" on Meters Menu.
5. Set Peak Hold to OFF.
6. Set Average to OFF.
7. Set Source to SC/DVM AC.
8. Set Meter Reading Units to Vrms.
9. Set Range as shown in Table 1-3. For each Range setting, set Calibrator for stated input.
Verify Meter Reading matches input within specified tolerance. lf not, go to Step 13.
Range Callbrator Input Frequency Readlng Tolerance
200 v190 Vrms 50 Hz 110.1 V
20v 19 Vrms 1 kHz 11.02 V
2V 1.9 Vrms 2O kHz 1106 mV
Table 1-3 SC/DVM AC Range Settings
10. Set Source to SC/DVM DC.
11. Set Range as shown in Table 1-4. For each Range setting, set Calibrator for stated input.
Verify Meter Reading matches input within specified tolerance. lf not, go to Step 13.
Range Callbrator Input Readlng Tolerance
200 v 1 90 Vdc +10.1 V
20v 19 Vdc 11.02 V
2V 1.9 Vdc t106 mV
Table 1-4 SC/DVM DC Range Settings
1-9
1-8-3 DVM CALIBRATION
PREREQUISITES:
1-8-1 POWER SUPPLY CALIBRATION
EQU IPMENT REQUIRED: CALIBRATOR
FIGURES: NONE
STEP PROCEDURE
1. Apply Power to COM-120B. Allow 5 minute warm-up period.
2. Connect Calibrator to SCOPE/DVM Connector (20).
3. Press MTRS Instruments Key (4).
4.
Select "3. DVM" on Meters Menu.
5. Set Peak Hold to OFF.
6.
Set Average to OFF.
7.
Set Source to SCIDVM AC.
8. Set Meter Reading Units to
Vrms.
9. Set Range as shown in Table 1-3. For each Range setting, set Calibrator for stated input.
Verify Meter Reading matches input within specified tolerance. If not, go to Step 13.
Range Calibrator Input Frequency
Reading Tolerance
200 V 190 Vrms 50 Hz !
±1 O. 1 V
20 V 19 Vrms
1 kHz
±1.02 V
2V
1.9 Vrms
I
20 kHz
±106 mV
I
Table 1-3 SC/DVM AC Range Settings
10. Set Source to SCIDVM DC.
11. Set Range as shown in Table 1-4. For each Range setting, set Calibrator for stated input.
Verify Meter Reading matches input within specified tolerance. If not, go to Step 13.
Range Calibrator Input
Reading Tolerance
200 V 190 Vdc
±10.1 V
20 V 19
Vdc
±1.02 V
2 V 1.9 Vdc
±106 mV
Table 1-4 SC/DVM DC Range Settings
1-9
Scans by ArtekMedia © 2008

STEP PROCEDURE
12. Set COM-1208 to OFF and disconnect test equipment.
PERFORM THE FOLLOWING ONLY WHEN REQUIRED.
13. Press SETUP MEMORY Key (21).
14. Select "1. Calibration" f rom Setup Screen.
15. Press ENTER Key to access Password Field. Press SHIFT, F, M, Y, S, V, C, D and SHIFT
Data Entry Keys (5). Press ENTER Key.
16. Select "1. DVM" to access DVM METER CALIBRATION Screen.
17. Move cursor to AC RANGE X1.
18. Set Calibrator to 1.000 Vrms at 60 Hz.
19. Press ENTER Key twice and wait until current Field displays CALIBnATED.
20. Move cursor to AC RANGE X10.
21. Set Calibrator to 10.00 Vrms at 60 Hz.
22. Press ENTER Key twice and wait until current Field displays CALIBBATED.
23. Move cursor to AC RANGE X100.
24. Set Calibrator to 100.0 Vrms at 60 Hz.
25. Press ENTER Key twice and wait until current Field displays CALIBRATED.
26. Move cursor to DC RANGE X1.
27. Set Calibrator to 2.000 Vdc.
28. Press ENTER Key twice and wait until current Field displays CALIBRATED.
29. Press RETURN Soft Function Key F6.
30. Press MTRS lnstruments Key (4).
31. Select "3. DVM" on Meters Menu.
32. Proceed at Step 7.
1-10
STEP PROCEDURE
12. Set COM-120B to OFF and disconnect test equipment.
PERFORM THE FOLLOWING ONLY WHEN REQUIRED.
13. Press SETUP MEMORY Key (21).
14. Select "1. Calibration" from Setup Screen.
15. Press ENTER Key to access Password Field. Press SHIFT, F, M, Y, S, V, C, D and SHIFT
Data Entry Keys (5). Press ENTER Key.
16. Select "1. DVM" to access DVM METER CALIBRATION Screen.
17. Move cursor to AC RANGE X1.
18. Set Calibrator to 1.000 Vrms at 60 Hz.
19. Press ENTER Key twice and wait until current Field displays CALIBRATED.
20. Move cursor to AC RANGE X10.
21. Set Calibrator to 10.00 Vrms at 60 Hz.
22. Press ENTER Key twice and wait until current Field displays CALIBRATED.
23. Move cursor to AC RANGE X100.
24. Set Calibrator to 100.0 Vrms at 60 Hz.
25. Press ENTER Key twice and wait until current Field displays CALIBRATED.
26. Move cursor to DC RANGE X1.
27. Set Calibrator to 2.000 Vdc.
28. Press ENTER Key twice and wait until current Field displays CALIBRATED.
29. Press RETURN Soft Function Key F6.
30. Press MTRS Instruments Key (4).
31. Select "3. DVM" on Meters Menu.
32. Proceed at Step 7.
1-10
Scans by ArtekMedia © 2008

1.8-4 GENERATOR OUTPUT LEVEL CALIBRATION
PREREQUISITES: 1-8-1 POWER SUPPLY CALIBRATION
EQUIPMENT REOUIRED: 1 MEASURING RECEIVER
FIGURES: NONE
STEP PROCEDURE
1. Apply Power to COM-1208. Allow 5 minute warm-up period.
2. Press GEN Test Mode Key (3) to access RF Generate Operation Screen.
3. Set RF Field to 405.5000 MHz.
4. Set all Modulation Sources to OFF.
5. Set Output to T/H and connect Measuring Receiver to T/R Connector. Set Measuring
Receiver for Automatic Tuning and Tuned RF Level Measurement.
6. Set Output Level to -20 dBm. Verify Measuring Receiver reads -20 dBm (t2 dB). lf not,
go to Step 14.
7. Set Output Level to -9O dBm. Verify Measuring Receiver reads -90 dBm (t2 dB). lf not,
go to Step 14.
8. Set Output Level to -130 dBm. Verify Measuring Receiver reads -130 dBm (12.5 dB). lf
not, go to Step 14.
9. Set Output to AUX and connect Measuring Receiver to AUX RF OUT Connector (13).
10. Set Output Level to -20 dBm. Verify Measuring Receiver reads -20 dBm (12 dB). lf not,
go to Step 14.
11. Set Output Level to -9O dBm. Verify Measuring Receiver reads -90 dBm (t2 dB). lf not,
go to Step 14.
12. Set Output Level to -130 dBm. Verify Measuring Receiver reads -130 dBm (42.5 dB). lf
not, go to Step 14.
13. Set COM-120B to OFF and disconnect test equipment.
PERFORM THE FOLLOWING ONLY WHEN REOUIRED.
14. Press SETUP MEMORY Key (21).
15. Select "1. Calibration" f rom Setup Screen.
16. Press ENTER Key to access Password Field. Press SHIFT, F, M, Y, S, V, C, D and SHIFT
Data Entry Keys (5). Press ENTER Key.
17. Select "6. RF GENERATOR - OUTPUT LEVEL" to access RF GENERATOR LEVEL
CALIBRATION Screen.
1-11
1-8-4 GENERATOR OUTPUT LEVEL CALIBRATION
PREREQUISITES:
1-8-1 POWER SUPPLY CALIBRATION
EQUIPMENT REQUIRED:
1 MEASURING RECEIVER
FIGURES:
NONE
STEP
PROCEDURE
1. Apply Power to COM-120B. Allow 5 minute warm-up period.
2. Press GEN Test Mode Key (3) to access RF Generate Operation Screen.
3. Set RF Field to 405.5000 MHz.
4. Set all Modulation Sources to OFF.
5. Set Output to TIR and connect Measuring Receiver to T/R Connector. Set Measuring
Receiver for Automatic Tuning and Tuned RF Level Measurement.
6. Set Output Level to -20 dBm. Verify Measuring Receiver reads -20 dBm (±2 dB). If not,
go to Step 14.
7. Set Output Level to -90 dBm. Verify Measuring Receiver reads -90 dBm (±2 dB). If not,
go to Step 14.
8. Set Output Level to -130 dBm. Verify Measuring Receiver reads -130 dBm (±2.5 dB). If
not, go to Step 14.
9. Set Output to AUX and connect Measuring Receiver to AUX RF OUT Connector (13).
10. Set Output Level to -20 dBm. Verify Measuring Receiver reads -20 dBm (±2 dB). If not,
go to Step 14.
11.
Set Output Level to -90 dBm. Verify Measuring Receiver reads -90 dBm (±2 dB). If not,
go to Step 14.
12. Set Output Level to -130 dBm. Verify Measuring Receiver reads -130 dBm (±2.5 dB). If
not, go to Step 14.
13. Set COM-120B to OFF and disconnect test equipment.
PERFORM THE FOLLOWING ONLY WHEN REQUIRED.
14. Press SETUP MEMORY Key (21).
15. Select "1. Calibration" from Setup Screen.
16. Press ENTER Key to access Password Field. Press SHIFT, F, M, Y, S, V, C, D and SHIFT
Data Entry Keys (5). Press ENTER Key.
17. Select "6. RF GENERATOR - OUTPUT LEVEL" to access RF GENERATOR LEVEL
CALIBRATION Screen.
1-11
Scans by ArtekMedia © 2008

STEP PROCEDURE
18. Press LEVEL Soft Function Key F2, if displayed.
19. Connect Measuring Receiver to T/R Connector.
20. Move cursor to -20 dBm Field. Press ENTER Key to access Data Field.
21. Edit Data Field using DATA SCROLL Keys (17) tor Measuring Receiver reading closest to
-20 dBm.
22. Press ENTER Key and wait until -20 dBm Field displays CALIBRATED.
23. Move cursor to -22 dBm Field. Press ENTER Key to access Data Field.
24. Edit Data Field using DATA SCROLL Keys (17) tor Measuring Receiver reading closest
-22 dBm.
25. Press ENTER Key and wait until -22 dBm Field displays CALIBBATED.
26. Move cursor to -24 dBm Field. Press ENTER Key to access Data Field.
27. Edit Data Field using DATA SCROLL Keys (17) tor Measuring Receiver reading closest
-24 dBm.
28. Press ENTER Key and wait until -24 dBm Field displays CALIBRATED.
29. Move cursor to -26 dBm Field. Press ENTER Key to access Data Field.
30. Edit Data Field using DATA SCROLL Keys (17), tor Measuring Receiver reading closest
-26 dBm.
31. Press ENTER Key and wait until -26 dBm Field displays CALIBRATED.
32. Move cursor to -28 dBm Field. Press ENTER Key to access Data Field.
33. Edit Data Field using DATA SCROLL Keys (17) tor Measuring Receiver reading closest
-28 dBm.
to
to
to
to
to
34. Press ENTER Key and wait until -28 dBm Field
35. Move cursor to -29.9 dBm Field. Press ENTER
36. Edit Data Field using DATA SCROLL Keys (17)
-29.9 dBm.
displays CALIBRATED.
Key to access Data Field.
f or Measuring Receiver reading closest
37. Press ENTER Key and wait until -29.9 dBm Field displays CALIBRATED.
38. Press T/R Soft Function Key F3. Set Measuring Receiver for RF Power Measurement.
t-tz
STEP PROCEDURE
18. Press LEVEL Soft Function Key F2, if displayed.
19. Connect Measuring Receiver to T/R Connector.
20. Move cursor to -20 dBm Field. Press ENTER Key to access Data Field.
21. Edit Data Field using DATA SCROLL Keys (17) for Measuring Receiver reading closest to
-20 dBm.
22. Press ENTER Key and wait until -20 dBm Field displays CALIBRATED.
23. Move cursor to -22 dBm Field. Press ENTER Key to access Data Field.
24. Edit Data Field using DATA SCROLL Keys (17) for Measuring Receiver reading closest to
-22 dBm.
25. Press ENTER Key and wait until -22 dBm Field displays CALIBRATED.
26. Move cursor to -24 dBm Field. Press ENTER Key to access Data Field.
27. Edit Data Field using DATA SCROLL Keys (17) for Measuring Receiver reading closest to
-24 dBm.
28. Press ENTER Key and wait until -24 dBm Field displays CALIBRATED.
29. Move cursor to -26 dBm Field. Press ENTER Key to access Data Field.
30. Edit Data Field using DATA SCROLL Keys (17) for Measuring Receiver reading closest to
-26 dBm.
31. Press ENTER Key and wait until -26 dBm Field displays CALIBRATED.
32. Move cursor to -28 dBm Field. Press ENTER Key to access Data Field.
33. Edit Data Field using DATA SCROLL Keys (17) for Measuring Receiver reading closest to
-28 dBm.
34. Press ENTER Key and wait until -28 dBm Field displays CALIBRATED.
35. Move cursor to -29.9 dBm Field. Press ENTER Key to access Data Field.
36. Edit Data Field using DATA SCROLL Keys (17) for Measuring Receiver reading closest to
-29.9 dBm.
37. Press ENTER Key and wait until -29.9 dBm Field displays CALIBRATED.
38. Press T/R Soft Function Key F3. Set Measuring Receiver for RF Power Measurement.
1-1 2
Scans by ArtekMedia © 2008

STEP PROCEDURE
39. Access each Data Field for f requencies 0.2500 to 999.9999 MHz. For each Data Field,
perform following:
O Press ENTER Key to access Data Field.
O Edit Data Field using DATA SCROLL Keys (17) tor Measuring Receiver reading
closest to -20 dBm.
a Press ENTER Key and wait until current Field displays CALIBnATED.
O Continue with next Field.
40. Press AUX Soft Function Key F4.
41. Connect Measuring Receiver to AUX RF OUT Connector (13).
42. Access each Data Field for f requencies 0.2500 to 999.9999 MHz. For each Data Field,
perform following:
a Press ENTER Key to access Data Field.
a Edit Data Field using DATA SCROLL Keys (17) tor Measuring Receiver reading
closest to -13 dBm.
O Press ENTER Key and wait until current Field displays CALIBRATED.
O Continue with next Field.
43. lf Optional Amplifier is installed, press AUX AMP Soft Function Key F5.
44. Access each Data Field for f requencies 0.2500 to 999.9999 MHz. For each Data Fietd,
perform following:
a Press ENTER Key to access Data Field.
O Edit Data Field using DATA SCROLL Keys (17) for Measuring Receiver reading
closest to 0.0 dBm.
O Press ENTER Key and wait until current Field displays CALIBRATED.
O Continue with next Field.
45. Press RETURN Soft Function Kev F6.
46. Press GEN Test Mode Key (3).
47. Continue at Step 2.
1-'13
STEP PROCEDURE
39. Access each Data Field for frequencies 0.2500 to 999.9999 MHz. For each Data Field.
perform following:
• Press ENTER Key to access Data Field.
• Edit Data Field using DATA SCROLL Keys (17) for Measuring Receiver reading
closest to -20 dBm.
• Press ENTER Key and wait until current Field displays CALIBRATED.
• Continue with next Field.
40. Press AUX Soft Function Key F4.
41. Connect Measuring Receiver to AUX RF OUT Connector (13).
42. Access each Data Field for frequencies 0.2500 to 999.9999 MHz. For each Data Field.
perform following:
• Press ENTER Key to access Data Field.
• Edit Data Field using DATA SCROLL Keys (17) for Measuring Receiver reading
closest to -13 dBm.
• Press ENTER Key and wait until current Field displays CALIBRATED.
• Continue with next Field.
43. If Optional Amplifier is installed. press AUX AMP Soft Function Key F5.
44. Access each Data Field for frequencies 0.2500 to 999.9999 MHz. For each Data Field.
perform following:
• Press ENTER Key to access Data Field.
• Edit Data Field using DATA SCROLL Keys (17) for Measuring Receiver reading
closest to 0.0 dBm.
• Press ENTER Key and wait until current Field displays CALIBRATED.
• Conti nue with next Field.
45. Press RETURN Soft Function Key F6.
46. Press GEN Test Mode Key (3).
47. Continue at Step 2.
1 -13
Scans by ArtekMedia © 2008

-8-5 DISTORTION METER
PREREQU ISITES:
EQU IPMENT REOUIRED:
FIG U RES:
CALIBRATION
1-8-1 POWER SUPPLY CALIBRATION
'l
AA
AUDIO ANALYZER
AUDIO/DATA
Figure 1-4 Distortion/SINAD Meter Test Equipment Setup
STEP PROCEDURE
1. Apply Power to COM-1208. Allow 5 minute warm-up period.
2. Connect Test Equipment as shown in Figure 1-4.
3. Press AUDIO GEN lnstruments Key ( ).
4. Set Audio Generator 2 to ON.
5. lf Optional Audio Generator 2 is installed, set Tone Frequency tor 1000.0 Hzand Shape to
S'NE.
6. Set Audio Generator 2 Level tor 1.41 Vp.
7. Set Audio Generator 1 to OIV.
8. Set Audio Generator 1 Format to TONE.
9. Set Audio Generator 1 Tone Frequency to 2800.0 Hz.
10. Set Audio Generator 1 Shape to SINE.
11. Set Audio Generator 1 Level to 0.14 Vp.
12. Set Audio Generator 1 Mode to CON]..
coM-1208
(1e) (14)
AUDIO ANALYZER
AUDIO/DATA GEN
1 1A
t-t+
1-8-5
DISTORTION METER CALIBRATION
PREREQUISITES:
1-8-1 POWER SUPPLY CALIBRATION
EQUIPMENT REQUIRED:
AUDIO ANALYZER
FIGURES:
1-4
COM-120B AUDIO ANALYZER
(19)
(14)
AUDIO/DATA IN
AUDIO/DATA GEN HIGH IMPEDANCE
INPUT
00603001
Figure 1-4 Distortion/SINAD Meter Test Equipment Setup
STEP
PROCEDURE
1. Apply Power to COM-120B. Allow 5 minute warm-up period.
2. Connect Test Equipment as shown in Figure 1-4.
3. Press AUDIO GEN Instruments Key (4).
4. Set Audio Generator 2 to ON.
5.
If Optional Audio Generator 2 is installed. set Tone Frequency for 1000.0 Hz and Shape to
SINE.
6. Set Audio Generator 2 Level for
1.41 Vp.
7. Set Audio Generator 1 to ON.
8.
Set Audio Generator 1 Format to
TONE.
9. Set Audio Generator 1 Tone Frequency to 2800.0 Hz.
10. Set Audio Generator 1
Shape to SINE.
11 . Set Audio Generator 1 Level to 0.14 Vp.
12. Set Audio Generator 1 Mode to CONT.
1-1 4
Scans by ArtekMedia © 2008

STEP PROCEDURE
13. Set Audio Analyzer to measure Distortion with all filters off .
14. Verify Audio Analyzer reads approximately 10% Distortion.
15. Press MTRS Instruments Key (4).
16. Select Distortion Meter Operation.
17. Set Distortion Meter Source to AUDIO/DATA-IN.
18. Set Peak Hold to OFF.
19. Set Average to OFF.
20. Set Low-Pass Filter to 20 kHz.
21. Verify Distortion Meter Reading matches Audio Analyzer (10.6%). lf not, go to Step 23.
22. Set COM-1208 Power to OFF and disconnect test equipment.
PERFORM THE FOLLOWING ONLY WHEN REQUIRED,
23. Set Audio Generator 2 tor 1.41 Vp.
24. Set Audio Generator 1 tor 0.14 Vp.
25. Press SETUP MEMORY Key (21).
26. Select "1. Calibration" f rom Setup Screen.
27. Press ENTER Key to access Password Field. Press SHIFT, F, M, Y, S, V, C, D and SHIFT
Data Entry Keys (5). Press ENTER Key.
28. Select "2. O ISTORTION METER" to access DISTORTION METER CALIBRATION Screen.
29. Enter Audio Analyzer Reading using DATA ENTRY Keys (5). Press ENTER Key.
30. Go to Step 15.
1-15
STEP PROCEDURE
13. Set Audio Analyzer to measure Distortion with all filters off.
14. Verify Audio Analyzer reads approximately 10% Distortion.
15. Press MTRS Instruments Key (4).
16. Select Distortion Meter Operation.
17. Set Distortion Meter Source to AUDIO/DATA-IN.
18. Set Peak Hold to OFF.
19. Set Average to OFF.
20. Set Low-Pass Filter to 20 kHz.
21. Verify Distortion Meter Reading matches Audio Analyzer (iO.6%). If not, go to Step 23.
22. Set COM-120B Power to OFF and disconnect test equipment.
PERFORM THE FOLLOWING ONLY WHEN REQUIRED.
23. Set Audio Generator 2 for 1.41 Vp.
24. Set Audio Generator 1 for 0.14 Vp.
25. Press SETUP MEMORY Key (21).
26. Select "1. Calibration" from Setup Screen.
27. Press ENTER Key to access Password Field. Press SHIFT, F, M, Y, S, V, C, D and SHIFT
Data Entry Keys (5). Press ENTER Key.
28. Select "2. DISTORTION METER" to access DISTORTION METER CALIBRATION Screen.
29. Enter Audio Analyzer Reading using DATA ENTRY Keys (5). Press ENTER Key.
30. Go to Step 15.
1 -15
Scans by ArtekMedia © 2008

1-8-6 SINAD METER CALIBRATION
PREREOUISITES: 1-8-1 POWER SUPPLY CALIBRATION
EQUIPMENT REQUIRED: 1 AUDIO ANALYZER
FIG U RES:
STEP
1-4
PROCED URE
1. Apply Power to COM-1208. Allow 5 minute warm-up period.
2. Connect Test Equipment as shown in Figure 1-4.
3. Press AUDIO GEN Instruments Key (a).
4. Set Audio Generator 2 to ON.
5. ff Optional Audio Generator 2 is installed, set Tone Frequency for 10A0.0 Hz and Shape to
srwE.
6. Set Audio Generator 2 Level tor 1.41 Vp.
7. Set Audio Generator 1 to OIV.
8. Set Audio Generator 1 Format to IONE.
9. Set Audio Generator 1 Tone Frequency to 2800.0 Hz.
10. Set Audio Generator 1 Shape to SIIVE.
11. Set Audio Generator 1 Level to 0.14 Vp.
12. Set Audio Generator 1 Mode to CONT.
13. Set Audio Analyzer to measure SINAD with filters off .
14. Verify Audio Analyzer reads approximately 20 dB SINAD.
15. Press MTRS Instruments Key (a).
16. Select SINAD Meter Operation.
17. Set SINAD Meter Source to AUDIO/DATA-IN.
18. Set Peak Hold to OFF.
19. Set Average to OFF.
20. Set Low-Pass Filter to 20 kHz.
21. Verify SINAD Meter Reading matches Audio Analyzer (11.1 dB). lf not, go to Step 23.
22. Set COM-120B Power to OFF and disconnect test equipment.
1-16
1-8-6 SINAD METER CALIBRATION
PREREQUISITES:
1-8-1 POWER SUPPLY CALIBRATION
EQUIPMENT REQUIRED: AUDIO ANALYZER
FIGURES:
1-4
STEP
PROCEDURE
1. Apply Power to COM-120B. Allow 5 minute warm-up period.
2. Connect Test Equipment as shown in Figure 1-4.
3. Press AUDIO GEN Instruments Key (4).
4. Set Audio Generator 2 to ON.
5.
If Optional Audio Generator 2 is installed, set Tone Frequency for 1000.0 Hz and Shape to
SINE.
6.
Set Audio Generator 2 Level for 1.41 Vp.
7.
Set Audio Generator 1 to ON.
8. Set Audio Generator 1 Format to TONE.
9. Set Audio Generator 1 Tone Frequency to 2800.0 Hz.
10.
Set Audio Generator 1 Shape to SINE.
11 .
Set Audio Generator 1
Level to 0.14 Vp.
12.
Set Audio Generator 1 Mode to CONT.
13. Set Audio Analyzer to measure SINAD with filters off.
14. Verify Audio Analyzer reads approximately 20 dB SINAD.
15. Press MTRS Instruments Key (4).
16. Select SINAD Meter Operation.
17. Set SINAD Meter Source to AUDIO/DATA-IN.
18. Set Peak Hold to OFF.
19. Set Average to OFF.
20. Set Low-Pass Filter to 20 kHz.
21. Verify SINAD Meter Reading matches Audio Analyzer (±1.1 dB). If not, go to Step 23.
22. Set COM-120B Power to OFF and disconnect test equipment.
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Scans by ArtekMedia © 2008