Operating instructions

Instrument Interfaces R&S ESCI
1166.6004.12 8.12 E-1
USB Connector (USB )
A USB connector is provided at the rear panel of the R&S FSP. This USB connector is used to connect
two USB devices (USB 1.1):
Pin Signal
1 + 5 V USB0
2 USBDATA0 -
3 USBDATA0 +
4GND
5 + 5 V USB1
6 USBDATA1 -
7 USBDATA1 +
1 2 3 4
5 6 7 8
8GND
Fig. 8-10 USB connector assignment
Note: Passive USB connection cables should not be longer than 1 m.
Reference Output/Input (REF IN and REF OUT)
For operation with an external reference, the internal reference oscillator is then synchronized to the 10-
MHz reference applied to the connector. The necessary level is > 0 dBm.
The internal 10 MHz reference signal is also available at the REF OUT connector and thus provides the
capability of, e.g., synchronization of external instruments to the R&S ESCI. The output level is 0 dBm.
Selection between internal and external reference is possible in the SETUP menu.
IF Output 20.4 MHz (20.4 MHz OUT)
The 20.4 MHz IF signal of the R&S ESCI is available at the 20.4 MHz OUT BNC connector. The
bandwidth corresponds to the selected bandwidth for a resolution bandwidth between 100 kHz and 10
MHz. For a resolution bandwidth below 100 kHz, the bandwidth of the output is 2.6 times the resolution
bandwidth with a minimum of 2.6 kHz.
The signal level at the IF output is 0 dBm for resolution bandwidth ≥ 100 kHz, and –10 dBm for
resolution bandwidth < 100 kHz (mixer level ≥ 60 dBm) .
Input for External Modulation of Tracking Generator (TG I /AM IN; TG
Q / FM IN) (Option FSP-B9)
Connectors TG I /AM IN and TG Q /FM IN are provided for external modulation of the tracking
generator.The input voltage range is ±0,5 V. input impedance is 50 Ohm.