Figure 1-1. Frequency Selective Level Meter AN/USM-490.
CHAPTER 1. INTRODUCTION - TM-11-6625-3087-120013
LIST OF ABBREVIATIONS.
Section II. EQUIPMENT DESCRIPTION
EQUIPMENT DATA-continued
Section III. TECHNICAL PRINCIPLES OF OPERATION
Figure 1-2. Frequency Selective Level Meter AN/USM-490 Simplified Block Diagram
GENERAL FUNCTIONAL DESCRIPTION-continued - TM-11-6625-3087-120019
GENERAL FUNCTIONAL DESCRIPTION-continued - TM-11-6625-3087-120020
CHAPTER 2. OPERATING INSTRUCTIONS
View A
UNIT push buttons
AVE push button
CENTER indicator
OVEN indicator
STEP indicator
WIDEBAND push button
NOISE/DEMOD push button
135 push button
FREQ push button
MEAS CONT push button
OFFSET push button
OFF push button
VOLUME knob
Figure 2-2. Operator's Controls, Indicators, and Connectors, rear view.
10 MHz oven connector
Section III. OPERATION UNDER USUAL CONDITIONS
STORE/RECALL PROCEDURES.
ERROR MESSAGES.
OPERATING PROCEDURES.
LOW DISTORTION MEASUREMENT.
LOW DISTORTION MEASUREMENT-continued
LOW NOISE MEASUREMENT.
LOW NOISE MEASUREMENT-continued
WIDEBAND MEASUREMENT.
WIDEBAND MEASUREMENT-continued
NOISE/DEMODULATION MEASUREMENT.
NOISE/DEMODULATION MEASUREMENT-continued
PHASE JITTER MEASUREMENT.
PHASE JITTER MEASUREMENT-continued
TONE 1004Hz AND 2600Hz MEASUREMENT.
TONE 1004Hz AND 2600Hz MEASUREMENT-continued
NOISE/TONE MEASUREMENT.
NOISE/TONE MEASUREMENT-continued
CARRIER MEASUREMENT.
CARRIER MEASUREMENT-continued
IMPULSE MEASUREMENT.
IMPULSE MEASUREMENT-continued
NETWORK ANALYSIS MEASUREMENT
OPERATION IN EXTREME HEAT AND EXTREME COLD.
CHAPTER 3. ORGANIZATION MAINTENANCE
Section III. TROUBLESHOOTING - TM-11-6625-3087-120064
Table 3-1. Troubleshooting-continued
AUDIO NOT OPERATIVE.
Section IV. MAINTENANCE PROCEDURES
REPLACE FUSE.
REPLACE FRONT PANEL CONTROL KNOBS.
REPLACE FRONT PANEL PUSH BUTTONS.
REPLACE BOTTOM BUMPERS AND TILT STANDS.
REPLACE AIR FILTER.
REPLACE REAR BUMPERS.
REPLACE SIDE HANDLES.
REPLACE FRONT HANDLES.
Section V. PREPARATION FOR STORAGE OR SHIPMENT
APPENDIX A. REFERENCES - TM-11-6625-3087-120077
APPENDIX B. MAINTENANCE ALLOCATION CHART (MAC)
Calibrate
Explanation of Columns in the MAC
Table 1. MAC for Frequency Selective Level Meter, AN/USM-490
Table 2. Tools and Test Equipment for Frequency Selective Level Meter, AN/USM-490
Table 2. Tools and Test Equipment for Frequency Selective Level Meter, AN/USM-490-continued
Table 3. Remarks for Frequency Selective Level Meter, AN/USM-490
APPENDIX C. COMPONENTS OF END ITEM AND BASIC ISSUE ITEMS LIST
Section II. COMPONENTS OF END ITEM
APPENDIX D. ADDITIONAL AUTHORIZATION LIST
APPENDIX E. EXPENDABLE SUPPLIES AND MATERIALS LIST
TM-11-6625-3087-12 Frequency Selective Level Meter AN/USM-490 Manual
CHAPTER 1. INTRODUCTION - TM-11-6625-3087-120013
LIST OF ABBREVIATIONS.
Section II. EQUIPMENT DESCRIPTION
EQUIPMENT DATA-continued
Section III. TECHNICAL PRINCIPLES OF OPERATION
Figure 1-2. Frequency Selective Level Meter AN/USM-490 Simplified Block Diagram
GENERAL FUNCTIONAL DESCRIPTION-continued - TM-11-6625-3087-120019
GENERAL FUNCTIONAL DESCRIPTION-continued - TM-11-6625-3087-120020
CHAPTER 2. OPERATING INSTRUCTIONS
View A
UNIT push buttons
AVE push button
CENTER indicator
OVEN indicator
STEP indicator
WIDEBAND push button
NOISE/DEMOD push button
135 push button
FREQ push button
MEAS CONT push button
OFFSET push button
OFF push button
VOLUME knob
Figure 2-2. Operator's Controls, Indicators, and Connectors, rear view.
10 MHz oven connector
Section III. OPERATION UNDER USUAL CONDITIONS
STORE/RECALL PROCEDURES.
ERROR MESSAGES.
OPERATING PROCEDURES.
LOW DISTORTION MEASUREMENT.
LOW DISTORTION MEASUREMENT-continued
LOW NOISE MEASUREMENT.
LOW NOISE MEASUREMENT-continued
WIDEBAND MEASUREMENT.
WIDEBAND MEASUREMENT-continued
NOISE/DEMODULATION MEASUREMENT.
NOISE/DEMODULATION MEASUREMENT-continued
PHASE JITTER MEASUREMENT.
PHASE JITTER MEASUREMENT-continued
TONE 1004Hz AND 2600Hz MEASUREMENT.
TONE 1004Hz AND 2600Hz MEASUREMENT-continued
NOISE/TONE MEASUREMENT.
NOISE/TONE MEASUREMENT-continued
CARRIER MEASUREMENT.
CARRIER MEASUREMENT-continued
IMPULSE MEASUREMENT.
IMPULSE MEASUREMENT-continued
NETWORK ANALYSIS MEASUREMENT
OPERATION IN EXTREME HEAT AND EXTREME COLD.
CHAPTER 3. ORGANIZATION MAINTENANCE
Section III. TROUBLESHOOTING - TM-11-6625-3087-120064
Table 3-1. Troubleshooting-continued
AUDIO NOT OPERATIVE.
Section IV. MAINTENANCE PROCEDURES
REPLACE FUSE.
REPLACE FRONT PANEL CONTROL KNOBS.
REPLACE FRONT PANEL PUSH BUTTONS.
REPLACE BOTTOM BUMPERS AND TILT STANDS.
REPLACE AIR FILTER.
REPLACE REAR BUMPERS.
REPLACE SIDE HANDLES.
REPLACE FRONT HANDLES.
Section V. PREPARATION FOR STORAGE OR SHIPMENT
APPENDIX A. REFERENCES - TM-11-6625-3087-120077
APPENDIX B. MAINTENANCE ALLOCATION CHART (MAC)
Calibrate
Explanation of Columns in the MAC
Table 1. MAC for Frequency Selective Level Meter, AN/USM-490
Table 2. Tools and Test Equipment for Frequency Selective Level Meter, AN/USM-490
Table 2. Tools and Test Equipment for Frequency Selective Level Meter, AN/USM-490-continued
Table 3. Remarks for Frequency Selective Level Meter, AN/USM-490
APPENDIX C. COMPONENTS OF END ITEM AND BASIC ISSUE ITEMS LIST
Section II. COMPONENTS OF END ITEM
APPENDIX D. ADDITIONAL AUTHORIZATION LIST
APPENDIX E. EXPENDABLE SUPPLIES AND MATERIALS LIST
TM-11-6625-3087-12 Frequency Selective Level Meter AN/USM-490 Manual
