Viavi CellAdvisor JD700B Series, Руководство пользователя

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Chapter 14 Using NB-IoT Signal Analyzer
JD700B Series User’s Guide
505
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.
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.
Figure 300 Connection ports for external reference clock
Procedure
1
Connect an external reference or a GPS antenna to the JD700B series.
2
Press the SYSTEM hot key.
3
Press the Freq Reference soft key, and then select the reference option: Internal , External 10
MHz , External 13 MHz , External 15 MHz , or GPS .
Table 21 External reference indicators
Type Indicator Description
Internal
(green)
The green INT icon indicates that the instrument uses the built-in
internal time base.