R&S UP300/350
System Menu (SYS Menu key)
Operating Manual, 11/2007
6-331
E-1147.2759.00
6.5.4.2
Selecting an Internal or External Reference Sources
Use
The R&S UP300/350 acting as the frequency standard for all internal
oscillators can use the internal reference source (
internal
) or an external
reference source (
external
). A 10 MHz crystal oscillator is used as the
internal reference source. When the default setting is activated (internal
reference), a 10 MHz frequency is output at the REF OUT rear-panel
connector [23] to synchronize other devices to the R&S UP300/350 reference
frequency, for example.
When the “REFERENCE external” setting is activated, the REF IN connector
[23] is used as the input for an external frequency standard. All the
R&S UP300/350’s internal oscillators are synchronized to this external
reference frequency (also 10 MHz).
Selecting the
reference source
1.
When required, connect the external reference source to the REF IN
connector [23].
2.
Press the
function key
in the
menu
.
The current reference source setting is displayed.
3.
Press the
ENTER key
[5].
A selection field containing the available settings is displayed. The
default setting is “intern”.
4.
Select a reference source with the
rotary knob
5.
Press the
ENTER key
[5].
The setting is saved and the R&S UP300/350 frequency standard is
taken from a new source.
Note:
If there is no reference signal when you switch over to the external
reference, the message PLL appears in the status line of the main menu after
a short delay to indicate that there is no synchronisation.
Summary of Contents for Smart Instruments UP300
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