Adjustment Procedures
2715 Spectrum Analyzer Service Manual
5- 23
k.
Disconnect P190 and reconnect the 10 MHz signal to P190 as was done
in step 1, c on Page 5--21.
l.
Press LIN and add proper external attenuation to the input signal to place
the nonstored trace at the bottom graticule line.
m.
Adjust R20 (VIO) to match the position of the stored display to the
nonstored display at the bottom graticule line. (Pressing D repeatedly
alternates the display between a nonstored and stored trace.)
n.
Press LIN and remove external attenuation to place the nonstored trace at
the top graticule line.
o.
Adjust R24 (VIG) to match the position of the stored display to the
nonstored display at the bottom graticule line.
p.
Repeat steps l through o to compensate for interaction between the
adjustment of R20 and R24.
q.
Disconnect the 10 MHz signal connected to P190 (step 1, c on Page
5--21) and reconnect P190.
r.
Set the FREQ/SPAN to 100 MHz, FREQUENCY to 500 MHZ, REF
LEVEL --30 dBm, RBW 300 kHz, and enable the calibrator by pressing
INPUT 9. Turn display storage off by pressing
DISPLAY STORAGE D
and press
VID FLTR
to turn the video filter off.
s.
Turn the readout off and position the center mark at center screen.
t.
Adjust R39 (HIO) to align the stored display to the nonstored display at
center screen. (Pressing DISPLAY STORAGE D repeatedly alternates
the display between stored and nonstored trace).
u.
Adjust R40 (HIG) to align the stored display to the nonstored display.
one division from the left and right edges, at center screen vertically.
v.
Enable DISPLAY STORAGE D.
w.
Enable REF LEVEL FINE and using the REF LEVEL
↑↓
keys, move
one of the signals to the first major division down from the top of the
screen.
x.
Adjust R181 (Vector Length) while repeatedly pressing DISPLAY D
until the peak of the digitized signal matches the peak of the analog
signal.
y.
Set FREQ/SPAN to ZERO SPAN, FREQUENCY to 100 MHz, RES
BW to 3 kHz, VIDEO FILTER on, and CALIBRATOR Off.
z.
Insert 30 dB of attenuation in the input signal path using the external
attenuators.
Содержание 2715
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