Reference

The frequency reference can be set to use the internal reference in the analyzer or use an external reference connected to the REF IN connector on the rear panel.

The REF IN on the rear panel accepts an external frequency reference from 10 MHz to 200 MHz . The REF OUT connector on the rear panel is used to connect the frequency reference to other test equipment.

 

Accessing Reference Settings

Using Hardkey/SoftTab/Softkey

Using a mouse

  1. Press Setup > Internal Hardware >  Reference...

  1. Click Instrument.

  2. Select Setup.

  3. Select Internal Hardware.

  4. Select Reference.

 

Reference dialog help

Reference In

Internal - Selects the 10 MHz internal frequency reference.

External 10 MHz - Selects an external 10 MHz frequency reference connected to the 10 MHz REF IN connector on the rear panel.

External Auto Freq - Locks the input clock frequency automatically.

External  - Locks at input clock as specified frequency.

 

Note:  The indicator at status bar shows this setting. The internal reference always is used in the phase noise measurement even if this is set at external.

Reference Out

10 MHz - Selects 10 MHz frequency reference.

100 MHz - Selects 100 MHz frequency reference.

Preference

Reference: Modify Settings on Preset and Recall: This is the same setting under the preference.

 

Clock Alignment

The clock alignment synchronizes the internal clocks. This is necessary to ensure the performance when the circuit temperature is changed after warm up. At the default, the clock alignment is performed automatically as necessary. If the analyzer get warm up well and your environment temperature is very stable, you may turn off the auto clock alignment. This avoids an interruption during your measurement. In auto alignment off mode, execute the Alignment Once when "Align recommended" is displayed in the message area.   

Clock Alignment

Using Hardkey/SoftTab/Softkey

Using a mouse

  • Press System > Service >  Auto Alignment  to turn on/off

  • Press System > Service >  Alignment Once to perform the clock alignment (This is available in Auto Alignment off)

  • Click Utility > System > Service > Auto Alignment [ON/off]

  • Click Utility > System > Service > Alignment Once