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CALIBRATION PROCEDURE FOR SPECTRUM ANALYZER AN/USM-489(V)1 (TEKTRONIX, TYPE 492 W/OPTIONS 01, 02, 03, 08, AND 21)
SECTION I. IDENTIFICATION AND DESCRIPTION
Table 1. Calibration Description ­ Continued.
Table 1. Calibration Description ­ Continued.
Table 1. Calibration Description ­ Continued.
SECTION II. EQUIPMENT REQUIREMENTS
SECTION III. CALIBRATION PROCESS
Equipment Setup
Frequency Accuracy
Table 3. Harmonic Number (n) Versus Frequency Range
Figure 2. Z-Axis Test Point Locations.
Figure 3. High Voltage Circuit Board (Later Version).
Figure 4. High Voltage Circuit Board (Early Version).
Figure 5. Deflection Amplifier - Equipment Setup.
Figure 6. Deflection Amplifier - Adjustment and Test Point Locations.
Frequency Accuracy - Continued
Figure 7. Sweep Timing - Equipment Setup.
Figure 8. 1st LO Balance and Span Adjustment and Test Points.
Frequency Accuracy - Continued
Frequency Accuracy - Continued
Frequency Accuracy - Continued
Figure 9. 2d LO Tuning Adjustment - Bottom View.
Frequency Accuracy - Continued
Figure 11. Baseline Leveling - Equipment Setup.
Figure 12. Video Processor - Adjustment and Test Point Locations.
Figure 13. Baseline Leveling - Typical Display Response Before and After Adjustments.
Frequency Accuracy - Continued
Figure 14. Typical Response Displays When Adjusting Compensation of Baseline Leveling Circuits
Figure 15. Log Amplifier - Equipment Setup.
Figure 16. Log and Video Amplifier - Adjustment Locations.
Frequency Accuracy - Continued
Figure 17. Adjustment Locations - VR #2 Module.
Frequency Accuracy - Continued
Figure 19. 100 kHz Filter Response.
Figure 20. Adjustment Location - VR #1 Module.
Table 4. Filter Leveling.
Figure 21. IF Gain - Adjustment Locations.
Frequency Accuracy - Continued
Figure 22. Digital Storage Adjustment Location (SN B043115 and Above).
Figure 24. Band Leveling - Equipment Setup.
Table 5. External Mixer Band Leveling Adjustments.
Figure 25. Preselector Drive - Adjustments and Test Point Locations.
Frequency Accuracy - Continued
Frequency Accuracy - Continued
Figure 26. RF Attenuation - Equipment.
Figure 27. RF Attenuator Accuracy.
IF Gain and Display Accuracy
Display Accuracy and Range
Amplitude Variation with Change in Resolution Bandwidth
Frequency Response
Figure 28. Frequency Response - Equipment Setup.
Frequency Response - Continued
Figure 29. Preselector Ultimate Rejection - Equipment Setup.
Frequency Span/Div
Table 6. Span/Division vs Time Markers.1
Figure 30. Frequency Span/Div - Equipment Setup.
Time/Div
Pulse Stretcher
Table 8. Time/Division Accuracy Check.
Figure 31. Resolution Bandwidth and Shape Factor.
Table 9. Average Noise Level dBm (Maximum) (-30 dBm).
Frequency Drift
Figure 32. Frequency Drift Measurement.
Figure 33. Noise Sidebands Measurement.
Figure 34. Digital Storage Measurement.
Triggering Operation and Sensitivity
Figure 35. External Trigger - Equipment Setup.
Power Supply






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