Operating Manual 1302.6163.12 - 03 4.263
R&S ESU Instrument Functions
Basic Settings
•The TRANSDUCER softkey opens a submenu for entering the correction
characteristics for transducers. For details refer to section “TRANSDUCER” on
page 4.269.
•The GENERAL SETUP softkey opens a submenu for all the general settings such
as GPIB address, date and time as well as the configuration of the device
interfaces. FIRMWARE OPTIONS can be installed under this menu item. For
details refer to section “GENERAL SETUP” on page 4.278.
•The SYSTEM INFO softkey opens a submenu for displaying the hardware
configuration of the instrument, the switching cycle statistics and system
messages. For details refer to section “SYSTEM INFO” on page 4.291.
•The SERVICE softkey opens a submenu in which special device functions and
system information can be selected for servicing. The password required for
service functions can be entered in this submenu. For details refer to section
“SERVICE” on page 4.293.
•The FIRMWARE UPDATE opens a submenu to update the firmware version, to
restore the firmware and to update the firmware path. For details refer to section
“Firmware Update” on page 4.296.
•The NOISE SRC ON/OFF softkey switches on and off the voltage supply for an
external noise source. For details refer to section “External Noise Source” on
page 4.297.
•The IF SHIFT softkey opens a submenu to activate or deactivate 1
st
IF shifting.
For details refer to “IF SHIFT” on page 4.298
•The RECEIVER PRESET softkey sets the receiver mode as preset mode. For
details refer to “PRESET RECEIVER” on page 4.297
•The ANALYZER PRESET softkey sets the analyzer mode as preset mode. For
details refer to “PRESET ANALYZER” on page 4.297
•The SERVICE FUNCTIONS softkey enables additional special settings for
servicing and troubleshooting. It is available after entering the corresponding
password under the SERVICE softkey.
4.9.3.1 External Reference
The R&S ESU 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 default setting
(internal reference), this frequency is available as output signal at rear-panel con-
nector REF OUT, e.g. to synchronize other instruments to the reference of the
R&S ESU.
In the setting REFERENCE EXT, the connector REF IN is used as input connector
for an external frequency standard. In this case all internal oscillators of the
R&S ESU are synchronized to the external reference frequency.
REFERENCE
FREQUENCY
As of firmware version 4.4x, instead of the REFERENCE INT / EXT softkey, the firm-
ware provides the REFERENCE FREQUENCY softkey. This softkey opens a sub-
menu to configure the reference more precisely.
To maintain the setup of a test system, the reference settings do not change if a pre-
set is performed.
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