User`s guide

6. Press (AMPLITUDE), ATTEN AUTO MAN .
Press the step-up key (m) once to select 20 dB
attenuation. Increasing the attenuation moves the noise floor closer to the signal.
A “#” mark appears next to the AT annotation at the top of the display, indicating the
attenuation is no longer coupled to other spectrum analyzer settings.
7. To see the signal more clearly, press 0 m. Zero attenuation makes the signal more visible.
(As a precaution to protect the spectrum analyzer input mixer, 0 dB RF attenuation can be
selected only with the number/units keypad.)
hp
REF
PEAV
COG
10
dB/
VA SE
SC FC
LOW
0 0 dBm
I-
L
ATTEN
0 idB
n
MYR 104 93 MHZ
#AT 0 dB -56 54 dBm
B
L
CEllTER 104 93 MHZ
5PAPl 10 no MHZ
RES BW 100 k.HL
“EW 30 CHL
SWP 20 0 mse
Figure 3-17.
Using 0 dB
Attenuation
Before connecting other signals to the spectrum analyzer input, increase the RF attenuation to
protect the spectrum analyzer input mixer: press ATTEN AUTO MAN so that AUTO is underlined
or press [AUTO COUPLE) and AUTO ALL.
Example: The resolution bandwidth can be decreased to view low-level signals.
1. As in the previous example, connect an antenna to the spectrum analyzer input. Set the
spectrum analyzer to view a low-level signal.
2. Press Isw) then a. The low-level signal appears more clearly because the noise level is
reduced. See Figure 3-18.
_ ., _- _
#RES BW 30
iHZ vew 30
kHZ CWP 33
3 m5tc
Figure 3-18. Decreasing Resolution Bandwidth
3-16 Making Basic Measurements