HP HP 8566B, Руководство по настройке

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16. YTO Loop Adjustments
running
.
2 0 0
. I
0 . 0 0 0 0 0
1 0 . 0 0 0 0 2 0 . 0 0 0 0
2 . 0 0
1
1
1
4
f - 3 . 0 0 0 v
Figure 3-74. Sampler Waveform at
37. Adjust for a minimum voltage level at the 210 MHz
(right) marker. Readjust to
make
the voltages at the
160 MHz (left) and 210 MHz (right) markers equally negative.
Carefully readjust and as necessary for
maximum flatness and lowest possible voltage of the displayed
waveform between the 160 MHz and 210 MHz markers.
38. On the oscilloscope, press and turn on the voltage markers
for the Channel 1 input. Place one voltage marker at the level
of the 160 MHz (left) and 210 MHz (right) markers, and place
the second voltage marker at the maximum voltage level of
the displayed waveform, as shown in Figure 3-74. The voltage
level of the displayed waveform between the 160 MHz and 210
MHz markers should be a minimum of 0.50 Vdc lower than
the
maximum voltage level.
39. Disconnect the oscilloscope’s Channel 1 input from
SAMPLER DC.
40. On the spectrum analyzer (DUT), note the fourth line of numerical
data appearing in the upper left corner of the spectrum analyzer
CRT; this is the g-digit M/N Loop Frequency, ranging from 177.500
000 MHz to 197.419 355 MHz. Note the currentlyselected M/N
Loop Frequency (corresponding to the minimum power YTO Start
Frequency from step 25).
3-142 Adjustments