JDS Uniphase CellAdvisor JD780A Series, Руководство пользователя

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JD780A Series Analyzers
Using Spectrum Analyzer
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2.
Toggle the External Offset soft key and select Off .
NOTE
This setting is not used in the Field Strength mode.
Scale per division
You can use the Scale/Div feature available for the spectrum measurement screen. 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.
Procedure
To set the scale per division:
1.
Press the AMP/SCALE hard key.
2.
Select More (1/2) > Scale/Div .
3.
Enter a value between 1 and 20 by using the numeric keys.
4.
Press the dB soft key to complete the entry.
Setting bandwidth
You can manually set the Resolution Bandwidth (RBW), Video Bandwidth (VBW), and the proportional
VBW based on the designated RBW. Selecting
Auto changes the value to correspond to your
frequency span setting for RBW and to the current RBW and VBW/RBW settings for VBW.
Procedure
To automatically set the RBW and VBW to your selected VBW/RBW ratio:
1.
Press the BW/AVG hard key.
2.
Press the VBW/RBW soft key to set the proportional VBW based on the designated RBW.
Table 9 shows the ratio example for 30 kHz RBW.
3.
Select the ratio: 1 , 0.3 , 0.1 , 0.03 , 0.01 , or 0.003 .
4.
Toggle the RBW soft key and select Auto .
5.
Toggle the VBW soft key and select Auto .
The RBW or VBW value on the screen changes accordingly based on the span.
To manually set the RBW or VBW to your selected VBW/RBW ratio:
1.
Press the BW/AVG hard key.
2.
Press the RBW soft key.
3.
Enter a value between 1 Hz to 3 MHz in 1-3 sequence by using the numeric keys.
4.
Select the unit: MHz , kHz , or Hz .
The RBW setting automatically changes to Manual .
5.
Press the VBW soft key.
6.
Enter a value by using the numeric keys.
7.
Select the unit: MHz , kHz , or Hz .
The VBW setting automatically changes to Manual .
The RBW or VBW value on the screen changes accordingly.