HP 8340B Manual page 209

5-16. LEVELED RF OUTPUT ADJUSTMENTS (Cont'd)
PEAK ADJUSTED
FOR MINIMUM
Figure 5-54.
8. On the OUT, press [INSTRPRESET] [SHIFT][CF] and enter [2] [0] [0]
of 200 MHz. Press [SWEEPTIME] [5] [0] [msec].Press [SHIFT][PWRSWP] to decouple the RF
attenuator and ALC, and enter
the AM on. Press [CW][8]
frequency selected.
Save this instrument state by pressing [SAVE][1].
9. Preset A24R1 (OFF A) (Figure 5-53), A24R2 (OFF B), A24R5 (X2C), A24R8 (X3C), and A24R11
(X4C) controls fully counter-clockwise.
10. Set the oscilloscope as follows:
DISPLAY
CHAN A
CHAN B
The oscilloscope display should look similar to Figure 5-55.
LEVELED POWER SRO BIAS ADJUSTMENT
11. Adjust A24R1 (OFF A) for optimum display as shown in Figure 5-55, Waveforms A, B, and C.
12. On the OUT, press [CW] [1] [3]
Figure 5-55, Waveforms A, B, and C.
13. On the OUT, press [CW] [1] [0]
(Channel A) at the start of the power sweep and keep the MOO LEVEL power sweep trace straight
with no step or bows as it sweep up (see Figure 5-55, Waveforms 0 and E).
5-104 Adjustments
HIGHEST
HEIGHT
Oscilloscope Display at A26TP3 MOD L VL with no Squegging
[0] [dBm].Press [PWRSWP] [4] [0] [dBm]and [AM]to turn
[2]
[-]
This puts the OUT in power sweep from —20 to +20 dB at any
[GHz].
Adjust A24R2 (OFF B) for optimum trace as shown in
[GHz].
Adjust A24R5 (X2C) to minimize the MOD LEVEL voltage
[GHz].
for a CW step size
[MHz]
CHOP
0.05 V/Div DC COUPLED
0.05 V/Div DC COUPLED
HP 8340B/41B