note |
This section is not available for R54. |
R60, R140, R140B and R180 models Reference Source
The Analyzer can operate either with an internal or external reference frequency (10 MHz) oscillator. Initially, the Analyzer is set to operate using the internal source of the reference frequency. An external high stability oscillator can be used if more accuracy and frequency stability is required. Connect the external oscillator through the 10MHz Reference Input/Output connector on the R60, R140, R140B or R180 side panel. Select the source of reference frequency oscillator in the software.
Press the System > Reference Source softkeys and select the reference source.
|
note |
For R60, R140B and R180, reference frequency source selection is not possible when REF 10 MHZ/TRIG OUT connector is used as logic signal output (see Trigger Output). The Reference Source and Reference Out softkeys will display [TRIG OUT].
|
While measuring transmission coefficient, one of the Analyzers becomes a signal source and the others are receivers. Analyzers’ internal reference generators have finite frequency accuracy. This means there is an arbitrary frequency offset even if signal source and receivers are tuned to the same frequency. Special techniques are required to get rid of this problem.
Mode |
Description |
|---|---|
Internal |
The Analyzers frequency is adjusted manually by searching the maximum of the source signal level (See Frequency adjustment of the internal generators). This mode does not need the Analyzers to be bound together with external reference frequency bus, but measurement speed and accuracy is worse than in External or Linked mode. |
Linked |
All the Analyzers reference frequency input/output signals are bound together within FD-16 distributor, or coaxial cable in case of using 2 Analyzers. The Analyzer designated as a port 1 (See Managing Devices) is a reference frequency source, and the others are reference frequency users. Selecting this type of frequency synchronization provides more precise and much measuring than Internal mode. |
External |
Similar to the Linked synchronization mode, but all Analyzers are receiving the reference frequency from arbitrary external reference frequency source. |
Press the System > Reference Source softkey and select the reference source in Reference Source dialog.
|
