HP 8340B Manual page 213

5-16. LEVELED RF OUTPUT ADJUSTMENTS
A. TYPICAL DET WAVEFORM
Figure 5-56. Typical MOD L VL and DET Waveforms for ALC Loop Gain Adjustment
In steps 25 through 29, the oscilloscope display will be adjusted for the
most horizontal line. This adjustment is only concerned with the trace up
to where it deviates from a flat line (see Figure 5-56, Waveform C). This
point on the display will change position with frequency.
25. On the oscilloscope, invert CHAN B and select DISPLAY A+B mode. Using the OUT's step keys,
step the CW frequency through Band 0 from 10 MHz to 2.21 GHz and adjust A26R43 (HET) for the
most horizontal line across Band 0.
26. On the OUT, press [CW] [2]
through Band 1 from 2.3 to 6.9 GHz and adjust A26R45 (Xl) for the most horizontal line across
Band 1.
5-108 Adjustments
I I
— — — — —
C. TYPICAL MOD LVL MINUS DET WAVEFORM
NOTE
[3] [GHz]. Using the OUT's step keys, step the
[.]
(Cont'd)
B. TYPICAL MOD LVL WAVEFORM
—
ADJUST TO
THIS POINT
CW
frequency
HP 8340B/41B