R&S ESR Series, User Manual

Page: 510 / 1126

System Configuration
R&S
®
ESR
507 User Manual 1175.7068.02 ─ 12
Reference Int/Ext
Switches between the internal and external reference signal source. The default setting
is internal reference. It is important that the external reference signal is deactivated
when switching from external to internal reference to avoid interactions. When an
external reference is used, "EXT REF" is displayed in the status bar.
If the reference signal is missing after switching to an external reference, the message
"NO REF" is displayed to indicate that no synchronization is performed.
The R&S ESR can use the internal reference source or an external reference source
as frequency standard from which all internal oscillators are derived. A 10 MHz crystal
oscillator is used as internal reference source. In the external reference setting, all
internal oscillators of the R&S
ESR are synchronized to the external reference fre-
quency. The external frequency can be set from 1 Hz to 20 MHz in 100 kHz steps.
For details on connectors, refer to Chapter 3.1.2, "Rear Panel View" , on page 35.
Remote command:
[SENSe:]ROSCillator:SOURce
on page 934
Handle missing Ext. Ref
If an external reference is selected but none is available, there are different ways the
instrument can react. This command opens a submenu to select the preferred method
of handling a missing external reference. By default, an error flag is displayed in the
status bar of the display.
The submenu contains the following commands:
●
"Show Error Flag" on page 507
●
"Auto select Reference" on page 507
Show Error Flag ← Handle missing Ext. Ref
If this option is selected, an error flag is displayed in the status bar of the display when
an external reference is selected but none is available.
Remote command:
[SENSe:]ROSCillator:SOURce
on page 934
Auto select Reference ← Handle missing Ext. Ref
If this option is selected, the instrument automatically switches back to the internal ref-
erence if no external reference is available. Note that you must re-activate the external
reference if it becomes available again later.
Remote command:
[SENSe:]ROSCillator:SOURce
on page 934
Transducer
Opens a dialog box that contains functionality to work with transducer factors or trans-
ducer sets.
Instrument Setup and Interface Configuration – SETUP Key