Aeroflex IFR 4000, Maintenance Manual, Page: 73 / 211

MAINTENANCE MANUAL
IFR 4000
2-2-3
Page 31
Aug 1/04
STEP PROCEDURE
15. Verify 90 Hz (
±
0.02%) with <2.5% distortion and an AM Depth of 20% AM
(
±
2% AM) on the Modulation Analyzer.
16. Set the TONE DEL Field to 90 .
17. Verify 150 Hz (
±
0.02%) with <2.5% distortion and an AM Depth of 20% AM
(
±
2% AM) on the Modulation Analyzer.
18. Set the Modulation Analyzer to DDM.
19. Set the Test Set as follows:
FIELD SETTING
DEV STEP FIXED
TONE DEL OFF
90/150 Hz OFF
20. Set the LOC DDM Field to the following settings and verify readings on the
Modulation Analyzer:
LOC DDM READING
0.000 CENTER 0.000 (
±
0.0015 DDM)
0.093 LEFT 0.093 (
±
0.0015 DDM +
±
3% of setting)
0.093 RIGHT 0.093 (
±
0.0015 DDM +
±
3% of setting)
0.155 LEFT 0.155 (
±
0.0015 DDM +
±
3% of setting)
0.155 RIGHT 0.155 (
±
0.0015 DDM +
±
3% of setting)
0.200 LEFT 0.200 (
±
0.0015 DDM +
±
3% of setting)
0.200 RIGHT 0.200 (
±
0.0015 DDM +
±
3% of setting)
21. Set the DEV STEP Field to VAR .
22. Set the LOC DDM Field to the following settings and verify readings on the
Modulation Analyzer:
LOC DDM READING
0.094 0.094 (
±
0.0025 DDM +
±
3% of setting)
0.095 0.095 (
±
0.0025 DDM +
±
3% of setting)
0.096
0.096 (
±
0.0025 DDM +
±
3% of setting)
0.097 0.097 (
±
0.0025 DDM +
±
3% of setting)
23. Set the Test Set as follows:
FIELD SETTING
DEV STEP FIXED
LOC DDM 0.000 CENTER