Fluke 5080A Service Manual page 77

Calibrator
SC200 Calibration
-34 dBc
-39 dBc
R8
3rd harmonic
2nd harmonic
yg127f.eps
Figure 19. Leveled Sine Wave Harmonics Adjustment
8. If the second and third harmonics are not at the correct dB level, adjust R8
until they are. You can find that you can have the second harmonic at -
34 dBc but the third harmonic is less than -39 dBc. Continue to adjust R8 until
the third harmonic is at -39 dBc and the second harmonic is ≥ -34 dBc. The
second harmonic will change, but there is a point at which both harmonics will
be at the correct decibel level.
67