Rohde & Schwarz FSV3000, Руководство пользователя

Страница: 357 / 1489

Common measurement settings
R&S
®
FSVA3000/ R&S
®
FSV3000
357 User Manual 1178.8520.02 ─ 08
RF Input Protection
The RF input connector of the R&S FSV/A must be protected against signal levels that
exceed the ranges specified in the data sheet. Therefore, the R&S FSV/A is equipped
with an overload protection mechanism for DC and signal frequencies up to 30 MHz.
This mechanism becomes active as soon as the power at the input mixer exceeds the
specified limit. It ensures that the connection between RF input and input mixer is cut
off.
When the overload protection is activated, an error message is displayed in the status
bar ("INPUT OVLD"), and a message box informs you that the RF input was discon-
nected. Furthermore, a status bit (bit 3) in the
STAT:QUES:POW
status register is set.
In this case, you must decrease the level at the RF input connector and then close the
message box. Then measurement is possible again. Reactivating the RF input is also
possible via the remote command
INPut<ip>:ATTenuation:PROTection:RESet
.
Radio Frequency State ............................................................................................... 357
Input Coupling ............................................................................................................. 357
Impedance .................................................................................................................. 358
Direct Path .................................................................................................................. 358
YIG-Preselector ...........................................................................................................359
Preselector Adjust ....................................................................................................... 359
Input Connector ...........................................................................................................359
Radio Frequency State
Activates input from the "RF Input" connector.
Remote command:
INPut<ip>:SELect
on page 1039
Input Coupling
The RF input of the R&S FSV/A can be coupled by alternating current (AC) or direct
current (DC).
For an active external frontend, input coupling is always DC.
Data input and output