VNA Help
Click here to see this page in full context

Reference

Note: This feature applies to instruments with serial prefix 6021 and above with A.14.00.xx firmware and above and with instruments with synthesizer 7.0 or greater.

The frequency reference can be set to use the internal reference in the VNA or use an external reference connected to the 10 MHz REF IN connector on the rear panel.

The 10 MHz REF IN on the rear panel accepts an external frequency reference of 10 MHz, 20 MHz, 80 MHz,or 100 MHz. The 10 MHz 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

Auto-select Reference (10 MHz Only) - When selected (default), the frequency reference selects between the internal 10 MHz reference or external 10 MHz reference automatically. The external reference will be selected if a signal is detected at the 10 MHz REF IN connector on the rear panel.  

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 100 MHz - Selects an external 100 MHz frequency reference connected to the 10 MHz REF IN connector on the rear panel.

External 20 MHz/80 MHz - Selects an external 20 MHz or 80 MHz frequency reference connected to the 10 MHz REF IN connector on the rear panel.

 Note: Using the signal from PXI Chassis backplane degrades the measurement performance especially absolute measurement. This is due to worse phase noise on the reference signal from backplane.

Reference Out

10 MHz - Selects 10 MHz frequency reference.

100 MHz - Selects 100 MHz frequency reference.

Preference

Ext Reference - Check to modify settings on a preset and recall or uncheck to make the current reference settings permanent. See Ext Device: De-activate on PRESET and recall in preference dialog.