Overview of N7821A Adjustments

This section describes all available adjustments for the ESG Series signal generators. These adjustments are performed so that the signal generator is properly calibrated. Run adjustments as required according to the Product Service Guide.

In all test equipment configurations, cables and adapters must be properly torqued. Exceeding recommended torque values can cause damage to a cable or adapter, and may cause inaccurate test results.

For proper calibration, perform the adjustments in the order listed below:

  1. Lock Angle

  2. Analog Bus ADC

  3. Pretune

  4. VCO Bias

  5. Internal Source

  6. Kv versus Frequency

  7. Timebase DAC

  8. FM Scale DAC Offset

  9. FM Path Offset

  10. FM In-band DAC Offset

  11. FM Invert AMP Offset

  12. FM Path 1 and 2 Ratio Gain

  13. Mod Source Relative Gain

  14. FM/PM Out-of-Band

  15. FM/PM YO Frequency Compensation

  16. DC FM

  17. LF Output

  18. External Input Peak Detector

  19. AM Audio Path Offset

  20. Burst Modulator

  21. I/Q Timeskew RF (Options 001, 002, 601, and or 602 Only)

  22. I/Q Timeskew Baseband (Options 001, 002, 601, or 602 Only)

  23. Prelevel

  24. VBLO Mixer Bias

  25. Digital Gain Adjust

  26. Bypass Gain Adjust

  27. ALC

  28. Power Flatness

  29. Attenuator

  30. ALC Modulation Driver Bias

  31. Power Search

  32. I/Q Gain/Offset/Quadrature

  33. I/Q Impairment

  34. AM Gain