(or small signals) to pass from the mixer with low distortion (or low
noise). It only works under internal mixer mode to adjust input
attenuator insider analyzer. In Auto mode, input attenuator is related
with reference level.
Key points:
⚫ When the preamplifier is On, the input attenuation could be set
up to 40 dB. You can adjust the reference level to ensure that
the specified parameters meet the requirement.
⚫ Modifying the reference level may cause an automatic change in
attenuation value; But the change of attenuation value won’t
influence reference level.
⚫ You can modify this parameter using the numeric keys, knob, or
direction keys.
Attenuator adjustment is to make the maximum signal amplitude
pass from mixer less than or equal to -10dBm. E.g. if the
reference level is +12dBm, the attenuator value is 22dB, then
the input level in mixer is -18dBm (12-22-8=-18), its mainly
purpose is to avoid signal compression. Switch [Input Atten Auto
Manual] to manual mode, adjust the attenuator manually. The
highlight under auto or manual stands for auto coupling and
manual coupling. When attenuator is under manual mode, press
[Input Atten Auto Manual] will match the attenuator and
reference level again.
Note: Maximum input signal amplitude of input attenuator (10dB
input attenuation at least) is +30dBm, higher power signal will
damage input attenuator or mixer.
5.3.3 [Scale/Div]
Sets the logarithmic units per vertical grid division on the display.
Select 1,2,4 or 10dB log amplitude scale. It’s 10dB/div by default.
Every activated marker is with dBm as unit, difference between two
markers is treated as marker difference under dB unit.
Key points:
⚫ By changing the scale, the displayed amplitude range is
adjusted.
⚫ The amplitude that can be displayed is from reference level
minus 10 times the current scale value to the reference level.
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