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Chapter 6 Using GSM/GPRS/EDGE Signal Analyzer
5
Enter a value by using the numeric keys. You can also use the rotary knob.
6
Press the Enter soft key.
7
The instrument automatically displays the corresponding center frequency value for the selected
channel number.
8
Optional. To define the amount of channel increment for the rotary knob, complete the following
steps:
a
Press the Channel Step soft key.
b
Enter a value by using the numeric keys. You can also use the rotary knob.
c
Press the Enter soft key.
NOTE
This frequency setting is not used in the Spurious Emissions mode.
Setting amplitude
Reference level and attenuation
You can set the reference and attenuation levels automatically or manually to optimize the display of
the traces measured, as you desire.
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 dBm soft key or the ENTER hard key.
This unit key name changes according to the setting in the Units menu.
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 for JD780B series or 50 dB for JD740B
series 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.
108
Select Attenuation > Manual.
Press the Attenuation Value soft key to set the level.
Enter a value in fives by using the numeric keys.
Press the dB soft key or the ENTER hard key.
JD700B Series User's Guide
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