Rohde & Schwarz SMBV100A - Clock Signals

Instrument Function
R&S
®
SMBV100A
276Operating Manual 1407.6062.32 ─ 08
5.8.2.3 Clock Signals
The clock reference used for generating the timing pulse can be either internal or external
("Clock Source" selection from the menu: "Internal / External").
To enable a very precise simultaneous signal generation of two or more R&S SMBVs,
two additional clock signals, "Sync. Master" and "Sync. Slave", are available. These both
clock signals are enabled only in the special synchronistion mode. See chapter 5.8.2.4,
"Synchronous Signal Generation", on page 277 for information how to configure two or
more instruments to work in a synchronization mode.
Internal clock reference
The table below gives an overview of the generated clock signals and the connectors
they are output at for the case a internal clock reference is selected.
Connector Location Clock Mode
CLOCK OUT rear panel Symbol clock
External clock reference
An external clock is always supplied via the CLOCK connector. When the external clock
reference is selected, the internal clock is synchronized to it. The table bellow gives an
overview of the connectors the internal clocks are output at.
Connector Location Clock Mode
CLOCK OUT rear panel Symbol clock
The active edge of the external clock signal on the CLOCK input is selectable (menu
"Setup > System > Global Trigger/Clock/External Inputs"). Internally the rising edge is
always taken as the active edge. The active rising edge of the internal clocks is therefore
synchronized with either the rising or the falling edge of the external clock reference. A
symbol clock can be supplied externally or, if internally generated or externally asyn-
chronous data is being fed in, a multiple of a symbol clock can be supplied.
In order for the clock synthesizer on the R&S SMBV to be synchronized correctly, the
external clock reference must first be applied and the correct symbol rate must then be
set. Until this has been done the external clock source must not be selected ("Clock
Source External").
Baseband Signal - Baseband Block