Chapter 11
Using EV-DO Signal Analyzer
392
JD700B Series User’s Guide
To turn the external offset off:
1
Press the
AMP/SCALE
hard key.
2
Toggle the
External Offset
soft key and select
Off
.
Setting average
You can set the number of measurements to be averaged for the trace presentation. A maximum of 100
times of averaging can be set. When the averaging reaches to your setting, a new measurement value
replaces the measurement value in sequence from the earliest.
Procedure
1
Press the
BW/AVG
hard key.
2
Press the
Average
soft key.
3
Enter a value between 1 and 100 as needed by using the numeric keys.
4
Press the
Enter
soft key.
Setting sweep mode
The default setting is
Continue
to sweep continuously for most on-going measurements. If you want to hold
the measurement or get a single sweep, you can change the sweep mode.
Procedure
To select the single sweep mode:
1
Press the
SWEEP
hot key.
2
Toggle the
Sweep Mode
soft key and select
Single
. You can also use the
HOLD
hot key.
The letter
HOLD
in red appears and the sweeping is paused.
3
Optional
. Press the
Sweep Once
soft key to get a new measurement.
To return to the continuous sweep mode:
1
Toggle the
Sweep Mode
soft key and select
Continue
. You can also use the
HOLD
hot key.
The letter
HOLD
in red disappears and the sweeping resumes.
Setting trigger source
You can set the trigger source option for your measurements. Connecting an external trigger is necessary
for accurate modulation measurements on EV-DO systems.
Procedure
1
Press the
TRIGGER
hot key.
2
Select the trigger source option from the choices:
Internal
,
External
, and
GPS
.
Setting external clock
To enhance the reliability of modulation analysis measurements the JD700B series must be synchronized
with a base station. When an external clock is not supplied, the instrument works with its built-in internal
high-accuracy time base and some measurement results may exhibit inaccurate values. Therefore, it is
highly recommended that you use the same reference clock as the signal source. You can use the
TRIGGER
hot key to set the external clock.
Содержание CellAdvisor JD700B Series
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Страница 808: ...Appendix JD700B Series User s Guide 807 JD740B series ...
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