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Procedure
To automatically set the reference and attenuation level:
1.
Press the AMP/SCALE hard key.
2.
Press the Auto Scale soft key.
Each time you press this key, both of the Y-axis scale and input attenuation level change to be
optimized with some margin.
To set the reference or attenuation level manually:
1.
Press the AMP/SCALE hard key.
2.
To set the maximum reference value on the Y-axis manually, complete the following steps:
a.
Press the Reference Level soft key.
b.
Enter a value by using the numeric keys or the rotary knob with 10 dB increments.
c.
Press the unit soft key or the ENTER hard key.
NOTE
In the measurements such as Control Channel, and Subframe, you may need to select
the reference option between Relative and Absolute before setting the reference level.
3.
To set the attenuation option, select one from the following choices:
–
To set the input attenuator's level automatically, select Attenuation > Auto.
NOTE
It is recommended that you set the Attenuation to Auto in most situations so that the
level of the input attenuator can be set automatically according to your input signal level.
–
To set the input attenuation manually up to 55 dB to optimize S/N, complete the following
steps:
a.
b.
c.
d.
–
To couple the input attenuator's level with your reference level setting, select Attenuation >
Couple.
As you increase the reference setting, the attenuation level also increases acoordingly.
Optional. To change the scale unit:
1.
Select More (1/2) > Units.
2.
Select the unit of the display scale: dBm, dBV, dBmV, dBµV, V, or W.
The scale unit on the screen changes accordingly.
NOTE
This Units menu is available in the Spectrum and RF Analysis modes.
Scale per division
You can use the Scale/Div feature available for the spectrum and RF analysis. It represents the value
of one division on the horizontal scale. The default setting is 10 dB per division and the maximum
value can be set up to 20 dB.
Select Attenuation > Manual.
Press the Attenuation Value soft key to set the level.
Enter a value between 0 and 55 in fives by using the numeric keys.
Press the dB soft key or the ENTER hard key.
Using LTE – TDD Signal Analyzer
JD780A Series Analyzers
267
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