SECTION I. GENERAL
SECTION II DESCRIPTION AND DATA MULTIMETER AN/USM-303 AND AN/USM-303A
Figure 1. Model 300M multimeter.
Technical Characteristic
Table 1. Waveform Error Referred to True Rms
Table 3. Overload Protection
Table 4. Circuit Disturbance Voltage and Current Measurements
Description of Multimeter
SECTION III. THEORY OF OPERATION
Figure 4. Simplified schematic diagram of dc voltage measuring circuit
Resistance Measurement System
Figure 8. Simplified schematic diagram of digital ohms (Wheatstone bridge) measuring circuit
SECTION IV. OPERATING INSTRUCTIONS
Operational Notes
Typical Operation Examples
Measurement of a Resistance of Unknown Value
SECTION V. APPLICATION
Low Insertion Loss DC Current Measurements
Low Loading AC Voltage Measurements
SECTION VI. MAINTENANCE
Replacement of Batteries and 10-Ampere Fuse
Figure 13. Schematic wiring diagram
Figure 14. Schematic shown in normal position
Figure 15. Adapter assembly. polarity reversal.
APPENDIX A. REFERENCES - TM-9-6625-1754-140035
APPENDIX B. MAINTENANCE ALLOCATION - TM-9-6625-1754-140037
Explanation of Format - TM-9-6625-1754-140038
SECTION II. MAINTENANCE ALLOCATION CHART - TM-9-6625-1754-140040
TABLE I. TOOL AND TEST EQUIPMENT REQUIREMENTS - TM-9-6625-1754-140041
APPENDIX C. ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE REPAIR PARTS AND SPECIAL TOOLS LIST
Maintenance code - TM-9-6625-1754-140044
Special Information - TM-9-6625-1754-140045
Federal Supply Code For Manufacturers - TM-9-6625-1754-140046
SECTION II. PRESCRIBED LOAD ALLOWANCE - TM-9-6625-1754-140048
SECTION III. REPAIR PARTS FOR ORGANIZATIONAL MAINTENANCE - TM-9-6625-1754-140049
SECTION V. REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE
SECTION V. REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE-continued - TM-9-6625-1754-140051
SECTION V. REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE-continued - TM-9-6625-1754-140052
SECTION V. REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE-continued - TM-9-6625-1754-140053
SECTION V. REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE-continued - TM-9-6625-1754-140054
SECTION VII. INDEX-FEDERAL STOCK NUMBER CROSS REFERENCE TO FIGURE AND ITEM NUMBER OR REFERENCE DESIGNATION
SECTION VII. INDEX-FEDERAL STOCK NUMBER CROSS REFERENCE TO FIGURE AND ITEM NUMBER OR REFERENCE DESIGNATION-continued
SECTION VIII. REFERENCE DESIGNATION CROSS REFERENCE TO PAGE NUMBER
SECTION VIII. REFERENCE DESIGNATION CROSS REFERENCE TO PAGE NUMBER-continued
TM-9-6625-1754-14 Multimeter AN/USM-303 Manual
SECTION II DESCRIPTION AND DATA MULTIMETER AN/USM-303 AND AN/USM-303A
Figure 1. Model 300M multimeter.
Technical Characteristic
Table 1. Waveform Error Referred to True Rms
Table 3. Overload Protection
Table 4. Circuit Disturbance Voltage and Current Measurements
Description of Multimeter
SECTION III. THEORY OF OPERATION
Figure 4. Simplified schematic diagram of dc voltage measuring circuit
Resistance Measurement System
Figure 8. Simplified schematic diagram of digital ohms (Wheatstone bridge) measuring circuit
SECTION IV. OPERATING INSTRUCTIONS
Operational Notes
Typical Operation Examples
Measurement of a Resistance of Unknown Value
SECTION V. APPLICATION
Low Insertion Loss DC Current Measurements
Low Loading AC Voltage Measurements
SECTION VI. MAINTENANCE
Replacement of Batteries and 10-Ampere Fuse
Figure 13. Schematic wiring diagram
Figure 14. Schematic shown in normal position
Figure 15. Adapter assembly. polarity reversal.
APPENDIX A. REFERENCES - TM-9-6625-1754-140035
APPENDIX B. MAINTENANCE ALLOCATION - TM-9-6625-1754-140037
Explanation of Format - TM-9-6625-1754-140038
SECTION II. MAINTENANCE ALLOCATION CHART - TM-9-6625-1754-140040
TABLE I. TOOL AND TEST EQUIPMENT REQUIREMENTS - TM-9-6625-1754-140041
APPENDIX C. ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE REPAIR PARTS AND SPECIAL TOOLS LIST
Maintenance code - TM-9-6625-1754-140044
Special Information - TM-9-6625-1754-140045
Federal Supply Code For Manufacturers - TM-9-6625-1754-140046
SECTION II. PRESCRIBED LOAD ALLOWANCE - TM-9-6625-1754-140048
SECTION III. REPAIR PARTS FOR ORGANIZATIONAL MAINTENANCE - TM-9-6625-1754-140049
SECTION V. REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE
SECTION V. REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE-continued - TM-9-6625-1754-140051
SECTION V. REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE-continued - TM-9-6625-1754-140052
SECTION V. REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE-continued - TM-9-6625-1754-140053
SECTION V. REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE-continued - TM-9-6625-1754-140054
SECTION VII. INDEX-FEDERAL STOCK NUMBER CROSS REFERENCE TO FIGURE AND ITEM NUMBER OR REFERENCE DESIGNATION
SECTION VII. INDEX-FEDERAL STOCK NUMBER CROSS REFERENCE TO FIGURE AND ITEM NUMBER OR REFERENCE DESIGNATION-continued
SECTION VIII. REFERENCE DESIGNATION CROSS REFERENCE TO PAGE NUMBER
SECTION VIII. REFERENCE DESIGNATION CROSS REFERENCE TO PAGE NUMBER-continued
TM-9-6625-1754-14 Multimeter AN/USM-303 Manual
