Aeroflex ATC-600A-2 User manual

MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 1
Nov 1/05
2. Calibration/Verification
A. General
(1) Calibration/Verification Schedule
Calibration/Verification Procedures should be performed if one or more of the following
conditions exist:
OFailure to Meet Specifications
If, during the course of normal operation, the ATC-600A-2 or any major function
thereof fails to meet the performance specifications in Appendix C,
Calibration/Verification Procedures should be performed.
OModule/Assembly Replacement
If one or more of the ATC-600A-2 assemblies are replaced, the Calibration/
Verification Procedures should be performed.
OAnnual Calibration/Verification
Aeroflex recommends an annual Calibration/Verification on the
ATC-600A-2 to maintain proper testing standards.
(2) Controls, Connectors and Indicators
Refer to Appendix D, Figures 1 and 2 for controls, connectors and indicators.
(3) Test Record
Data Sheets are provided for recording results obtained while performing the
Calibration/Verification Procedures.
NOTE: It is recommended the technician reproduce copies of the Calibration/
Verification Data Sheets, rather than use the copies in this manual.
B. Precautions
(1) Safety
WARNING: REMOVE ALL JEWELRY OR OTHER COSMETIC APPAREL BEFORE
PERFORMING ANY CALIBRATION/VERIFICATION PROCEDURE
INVOLVING LIVE CIRCUITS.
WARNING: WHEN WORKING WITH LIVE CIRCUITS OF HIGH POTENTIAL, KEEP
ONE HAND IN POCKET OR BEHIND BACK TO AVOID SERIOUS SHOCK
HAZARD.
WARNING: USE ONLY INSULATED TROUBLESHOOTING TOOLS WHEN WORKING
WITH LIVE CIRCUITS.
WARNING: FOR ADDED INSULATION, PLACE RUBBER BENCH MAT UNDERNEATH
ALL POWERED BENCH EQUIPMENT, AS WELL AS A RUBBER MAT
UNDERNEATH TECHNICIAN’S CHAIR.
WARNING: HEED ALL WARNINGS AND CAUTIONS CONCERNING MAXIMUM
VOLTAGES AND POWER INPUTS.
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 2
Nov 1/05
(2) ESD
CAUTION: THE CALIBRATION PROCEDURES SHOULD ONLY BE PERFORMED IN
AN ESD ENVIRONMENT. ALL PERSONNEL PERFORMING THE
CALIBRATION PROCEDURES SHOULD HAVE KNOWLEDGE OF
ACCEPTED ESD PRACTICES AND/OR BE ESD CERTIFIED.
CAUTION
THIS EQUIPMENT CONTAINS PARTS
SENSITIVE TO DAMAGE
BY ELECTROSTATIC DISCHARGE (ESD)
(3) EMC and Safety Compliance
All assemblies, cables, connectors, plastic fasteners, gaskets, fingerstock and
miscellaneous hardware within the Test Set are configured to satisfy the safety and
EMC compliance standards.
CAUTION: UPON COMPLETION OF ANY MAINTENANCE ACTION; ALL
ASSEMBLIES, CABLES, CONNECTORS, PLASTIC FASTENERS,
GASKETS, FINGERSTOCK AND MISCELLANEOUS HARDWARE MUST
BE CONFIGURED AS INSTALLED AT THE FACTORY.
C. Requirements
(1) Test Set Configuration
The ATC-600A-2 must be installed according to the Installation Calibration procedure
in the ATC-600A-2 Operation Manual.
(2) Test Equipment
Appendix B contains a comprehensive list of test equipment suitable for performing
any procedure contained in this manual. Other equipment meeting specifications listed
in Appendix B may be substituted in place of recommended models.
NOTE: For certain procedures in this manual, the test equipment listed in Appendix B
may exceed the minimum required specifications.
(3) Disassembly
Remove lid from ATC-600A-2 to perform the Verification Procedures.
Remove lid and case from ATC-600A-2 to perform the Calibration Procedures.
(4) Environment
For best results, the calibration environmental conditions should be identical to the
environmental conditions at the normal operating location.
D. Procedure Instruction
It is strongly recommended that personnel thoroughly read and understand all steps of the
procedures to be performed and be familiar with the circuit under test. Knowledge of
power, frequency and waveform to be expected at each test point is recommended.
NOTE: When one circuit provides the same pulse characteristic for different pulses, it is
necessary to test the specifications for that characteristic only once. Pulse
spacings are measured from leading edge to leading edge at the 50% amplitude
points. Pulse widths are measured from leading edge to trailing edge
at the 50% amplitude points.
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 3
Nov 1/05
E. Verification Procedures
PROCEDURE PAGE
Preparation for Testing ------------------------------------------------------------------------------- 4
XPDR Interrogation Pulse Spacing ----------------------------------------------------------------- 5
XPDR Pulse Width ------------------------------------------------------------------------------------- 6
XPDR Interrogation PRF Frequency ---------------------------------------------------------------- 7
Framing Pulse Spacing (XPDR) --------------------------------------------------------------------- 8
A/C CODE Mode Readout ---------------------------------------------------------------------------- 9
A/C ALT Mode Readout ------------------------------------------------------------------------------- 10
XPDR System Self Test ------------------------------------------------------------------------------- 11
IDENT PULSE Indicator - XPDR--------------------------------------------------------------------- 12
INVALID ALT Indicator - XPDR ---------------------------------------------------------------------- 13
NO ALT Indicator - XPDR----------------------------------------------------------------------------- 14
XPDR % RPLY/DME PRF Meter - XPDR ----------------------------------------------------------- 15
FREQ/PWR Meter (PWR) - XPDR ------------------------------------------------------------------- 16
FREQ/PWR Meter (FREQ) - XPDR------------------------------------------------------------------ 17
Squitter Frequency - DME ---------------------------------------------------------------------------- 18
IDENT Tone and Pulse Spacing - DME ------------------------------------------------------------ 19
X and Y Channel Pulse Spacing - DME ------------------------------------------------------------ 20
Pulse Width - DME------------------------------------------------------------------------------------- 21
Range Slew - DME ------------------------------------------------------------------------------------- 22
50% Reply - DME -------------------------------------------------------------------------------------- 23
DME PRF - DME---------------------------------------------------------------------------------------- 24
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 4
Nov 1/05
(1) Preparation for Testing
STEP PROCEDURE
1. Remove lid from Test Set.
2. Apply external ac power to Test Set AC POWER Connector; 115 or 240 VAC,
depending on how Test Set is wired.
3. Press PWR/BAT Switch to PWR.
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 5
Nov 1/05
(2) XPDR Interrogation Pulse Spacing
PREREQUISITES: None
TEST EQUIPMENT: Oscilloscope
STEP PROCEDURE
1. Set MODE Switch to A/C ALT.
2. Connect Oscilloscope (vertical input) to DIODE SWITCH INPUT Connector.
3. Set Oscilloscope sweep to view all pulses of the XPDR Interrogation Signal
(approximately 5 µs/cm).
4. Set INTERROGATION SPACING Control to 0.
5. Set (and hold) the 0/OFF/-9 dB SLS Switch to 0dB and verify P2pulse is 2 µs
(±0.05 µs) from P1.
6. Set MODE Switch to the following settings and verify P1to P3spacing:
MODE SWITCH SETTING P1TO P3SPACING
A/C ALT 21 µs (±0.05 µs)
A/C CODE 8 µs (±0.05 µs)
A 8 µs (±0.05 µs)
7. Set (and hold) the 0/OFF/-9 dB SLS Switch to 0dB and verify P2and P3pulses
are relative to P1.
8. Set MODE Switch to A/C ALT.
9. Adjust INTERROGATION SPACING Control from -1 to +1 and verify P2and P3
are adjusted accordingly.
10. Disconnect Oscilloscope from DIODE SWITCH INPUT Connector.
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 6
Nov 1/05
(3) XPDR Pulse Width
PREREQUISITES: None
TEST EQUIPMENT: Oscilloscope
NOTE: This procedure measures the XPDR pulse at the ATC-600A-2 rear panel. To
measure the XPDR pulse at the ATC-600A-2 front panel, refer to the
Calibration section.
STEP PROCEDURE
1. Connect Oscilloscope (vertical input) to DIODE SWITCH INPUT Connector.
2. Set Oscilloscope sweep to view all pulses of the XPDR Interrogation Signal
(approximately 5 µs/cm).
3. Verify all XPDR pulses are 0.8 µs (±0.1 µs) wide at the 50% point.
4. Disconnect Oscilloscope from DIODE SWITCH INPUT Connector.
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 7
Nov 1/05
(4) XPDR Interrogation PRF Frequency
PREREQUISITES: None
TEST EQUIPMENT: Frequency Counter
STEP PROCEDURE
1. Connect Frequency Counter to DIODE SWITCH INPUT Connector.
2. Verify count to 470 Hz and divide by 2 for PRF of 235 (±15).
3. Disconnect Frequency Counter from DIODE SWITCH INPUT Connector.
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 8
Nov 1/05
(5) Framing Pulse Spacing (XPDR)
PREREQUISITES: None
TEST EQUIPMENT: 34 dB Pad
Transponder
STEP PROCEDURE
1. Connect coaxial cable and 34 dB Pad between Transponder and RF
INPUT/OUTPUT Connector.
2. Set MODE Switch to A/C CODE.
3. Set Transponder Code to all zeros.
4. Verify F2of XPDR reply pulses.
5. Adjust FRAMING PULSE SPACING Control and verify F2PULSE SPACING
Indicator is OFF between -0.2 and +0.2 µs spacing.
6. Disconnect Transponder from RF INPUT/OUTPUT Connector.
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 9
Nov 1/05
(6) A/C CODE Mode Readout
PREREQUISITES: None
TEST EQUIPMENT: Transponder
STEP PROCEDURE
1. Connect coaxial cable and 34 dB Pad between Transponder and RF
INPUT/OUTPUT Connector.
2. Set Transponder Pilot’s Code from 0000 to 7777 and verify:
OPilot’s Code on NUMERICAL Readout.
OOCTAL READOUT Indicators (A1 through D4) follow the code display and the
code applied to the Test Set from the XPDR.
3. Disconnect Transponder from RF INPUT/OUTPUT Connector.
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 10
Nov 1/05
(7) A/C ALT Mode Readout
PREREQUISITES: None
TEST EQUIPMENT: Test Switch Assembly
Transponder
STEP PROCEDURE
1. Connect coaxial cable and 34 dB Pad between Transponder and RF
INPUT/OUTPUT Connector.
2. Connect Test Switch Assembly to Transponder (to simulate altitude pulses).
3. Set MODE Switch to A/C ALT.
4. Set all test switches on Test Switch Assembly to ON.
5. Set test switch C4 to OFF and verify 84.1 thousand feet on NUMERICAL
Readout.
6. Set all test switches on Test Switch Assembly to OFF
7. Set test switch C4 to ON and verify 254.7 thousand feet on NUMERICAL
Readout.
8. Set test switch C4 to OFF.
9. Set test switch C2 to ON and verify -1 thousand feet on NUMERICAL Readout.
10. Verify OCTAL READOUT Indicators A1 through D4 displays the altitude code
into the Test Set.
11. Disconnect Test Switch Assembly from Transponder.
12. Disconnect Transponder from RF INPUT/OUTPUT Connector.
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 11
Nov 1/05
(8) XPDR System Self Test
PREREQUISITES: None
TEST EQUIPMENT: None
STEP PROCEDURE
1. Set ATC-600A-2 controls as follows:
CONTROL SETTING
MODE Switch A/C ALT
SYS/LAMP TEST Switch SYS
2. Verify 126.7 thousand feet on NUMERICAL Readout.
3. Set MODE Switch to A/C CODE.
4. Verify 0042 on NUMERICAL Readout.
5. Set MODE Switch to A.
6. Verify 0042 on NUMERICAL Readout.
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 12
Nov 1/05
(9) IDENT PULSE Indicator - XPDR
PREREQUISITES: None
TEST EQUIPMENT: Transponder
STEP PROCEDURE
1. Connect coaxial cable and 34 dB Pad between Transponder and RF
INPUT/OUTPUT Connector.
2. Set MODE Switch to A/C CODE.
3. Press Ident Switch on Transponder Control Head and verify IDENT PULSE
Indicator illuminates for approximately 20-30 seconds.
4. Disconnect Transponder from RF INPUT/OUTPUT Connector.
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 13
Nov 1/05
(10) INVALID ALT Indicator - XPDR
PREREQUISITES: None
TEST EQUIPMENT: Test Switch Assembly
Transponder
STEP PROCEDURE
1. Connect coaxial cable and 34 dB Pad between Transponder and RF
INPUT/OUTPUT Connector.
2. Connect Test Switch Assembly to Transponder (to simulate altitude pulses).
3. Set Test Switches C1 and C4 to ON and verify INVALID ALT Indicator lights and
flags appear in NUMERICAL Readout.
4. Disconnect Test Switch Assembly from Transponder.
5. Disconnect Transponder from RF INPUT/OUTPUT Connector.
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 14
Nov 1/05
(11) NO ALT Indicator - XPDR
PREREQUISITES: None
TEST EQUIPMENT: Test Switch Assembly
Transponder
STEP PROCEDURE
1. Connect coaxial cable and 34 dB Pad between Transponder and RF
INPUT/OUTPUT Connector.
2. Connect Test Switch Assembly to Transponder (to simulate altitude pulses).
3. Set all test Switches to OFF and verify NO ALT Indicator lights.
4. Disconnect Test Switch Assembly from Transponder.
5. Disconnect Transponder from RF INPUT/OUTPUT Connector.
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 15
Nov 1/05
(12) XPDR % RPLY/DME PRF Meter - XPDR
PREREQUISITES: None
TEST EQUIPMENT: Test Switch Assembly
Transponder
STEP PROCEDURE
1. Connect coaxial cable and 34 dB Pad between Transponder and RF
INPUT/OUTPUT Connector.
2. Connect Test Switch Assembly to Transponder (to simulate altitude pulses).
3. Set Transponder to reply in A/C Mode.
4. Verify XPDR % RPLY/DME PRF Meter displays 100% of interrogating mode.
5. Disconnect Test Switch Assembly from Transponder.
6. Disconnect Transponder from RF INPUT/OUTPUT Connector.
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 16
Nov 1/05
(13) FREQ/PWR Meter (PWR) - XPDR
PREREQUISITES: None
TEST EQUIPMENT: 34 dB Pad
Transponder
STEP PROCEDURE
1. Connect coaxial cable and 34 dB Pad between Transponder and RF
INPUT/OUTPUT Connector.
2. Set FREQ/PWR Switch to PWR.
3. Verify FREQ/PWR Meter displays XPDR power (±20%).
4. Disconnect Transponder from RF INPUT/OUTPUT Connector.
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 17
Nov 1/05
(14) FREQ/PWR Meter (FREQ) - XPDR
PREREQUISITES: None
TEST EQUIPMENT: Signal Generator
STEP PROCEDURE
1. Set Signal Generator controls as follows:
CONTROL SETTING
Frequency 1093 MHz
Level 5 dBm (±2 dB)
Mode CW
2. Set ATC-600A-2 controls as follows:
CONTROL SETTING
XMTR FREQ Control +3
FREQ/PWR Switch FREQ
FREQ GAIN Control (Midscale)
3. Connect Signal Generator to RF INPUT/OUTPUT Connector.
4. Adjust XMTR FREQ Control and verify FREQ/PWR Meter peaks at 3 MHz.
5. Set Signal Generator to 1086 MHz.
6. Adjust XMTR FREQ Control and verify FREQ/PWR Meter peaks at 4 MHz.
7. Set Signal Generator to 1090 MHz.
8. Adjust XMTR FREQ Control and verify FREQ/PWR Meter peaks at 0 MHz.
9. Disconnect Signal Generator from RF INPUT/OUTPUT Connector.
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 18
Nov 1/05
(15) Squitter Frequency - DME
PREREQUISITES: None
TEST EQUIPMENT: Frequency Counter
STEP PROCEDURE
1. Connect Frequency Counter to DIODE SWITCH INPUT Connector.
2. Set ATC-600A-2 controls as follows:
CONTROL SETTING
SQUITTER ON/OFF Switch SQTR
MODE Switch DME
3. Verify average squitter count of 5400 Hz (±400 Hz) on Frequency Counter.
4. Disconnect Frequency Counter from DIODE SWITCH INPUT Connector.
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 19
Nov 1/05
(16) IDENT Tone and Pulse Spacing - DME
PREREQUISITES: None
TEST EQUIPMENT: Frequency Counter
STEP PROCEDURE
1. Connect Frequency Counter to DIODE SWITCH INPUT Connector.
2. Set SQUITTER ON/OFF Switch to OFF.
3. Toggle and hold the IDENT/50% RPLY Switch to IDENT.
4. Verify 5400 Hz (±60 Hz) on Frequency Counter.
5. Verify Pulse Pair spacing is 100 µs from P2of first pair to P2of second pair at
the 50% point.
6. Disconnect Frequency Counter from DIODE SWITCH INPUT Connector.
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MAINTENANCE MANUAL
ATC-600A-2
2-2-2
Page 20
Nov 1/05
(17) X and Y Channel Pulse Spacing - DME
PREREQUISITES: None
TEST EQUIPMENT: DME 2-Pulse Generator
Oscilloscope
STEP PROCEDURE
1. Connect DME 2-Pulse Generator (output) and Oscilloscope to DETECTED RF
VIDEO OUTPUT Connector using a T-Connector.
2. Set DME CHANNEL Switch to 17Y.
3. Set DME 2-Pulse Generator Switch to Y Channel.
4. Connect Oscilloscope to DIODE SWITCH INPUT Connector.
5. Adjust Oscilloscope to display interrogation pulse (from DME) and reply (from
DIODE SWITCH INPUT Connector).
6. Verify spacing is 55.8 µs (±0.3 µs) from P1of interrogation to P1of reply.
7. Adjust Oscilloscope to display only the two pulses from the DIODE SWITCH
INPUT Connector.
8. Verify spacing is 30 µs (±0.3 µs) from P1of interrogation to P1of reply.
9. Set DME CHANNEL Switch to 17X.
10. Set DME 2-Pulse Generator Switch to X Channel.
11. Adjust Oscilloscope to display interrogation pulse (from DME) and reply (from
DIODE SWITCH INPUT Connector).
12. Verify spacing is 49.8 µs (±0.3 µs) from P1of interrogation to P1of reply.
13. Adjust Oscilloscope to display only the two pulses from the DIODE SWITCH
INPUT Connector.
14. Verify spacing is 12 µs (±0.3 µs) from P1of interrogation to P1of reply.
15. Set DME CHANNEL Switch to 18X.
16. Set DME 2-Pulse Generator Switch to X Channel.
17. Adjust Oscilloscope to display interrogation pulse (from DME) and reply (from
DIODE SWITCH INPUT Connector).
18. Verify spacing is 49.8 µs (±0.3 µs) from P1of interrogation to P1of reply.
19. Adjust Oscilloscope to display only the two pulses from the DIODE SWITCH
INPUT Connector.
20. Verify spacing is 12 µs (±0.3 µs) from P1of interrogation to P1of reply.
21. Disconnect Oscilloscope from DIODE SWITCH INPUT Connector.
22. Disconnect DME 2-Pulse Generator and Oscilloscope from DETECTED RF
VIDEO OUTPUT Connector.
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