Setting Trigger Source; Setting External Clock - JDS Uniphase CellAdvisor JD700B Series User Manual

Chapter 9 Using LTE - TDD Signal Analyzer
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
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

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 111 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 14 External reference indicators
Type Indicator
Internal
238
HOLD in red appears and the sweeping is paused.
HOLD in red disappears and the sweeping resumes.
Description
The green INT icon indicates that the instrument uses the built-in
(green)
internal time base.
JD700B Series User's Guide