Chapter 6
Using GSM/GPRS/EDGE Signal Analyzer
146
JD700B Series User’s Guide
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:
Press the
Channel Step
soft key.
Enter a value by using the numeric keys. You can also use the rotary knob.
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:
Press the
Reference Level
soft key.
Enter a value by using the numeric keys or the rotary knob with 10 dB increments.
Press the unit 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:
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.
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.
Содержание CellAdvisor JD700B Series
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Страница 808: ...Appendix JD700B Series User s Guide 807 JD740B series ...
Страница 811: ...Appendix 810 JD700B Series User s Guide Figure 470 Append keywords window ...