Rohde & Schwarz 1145.1010.04/05/06, Operating Manual

Page: 422 / 813

System Menu R&S
®
ZVA/ZVB/ZVT
1145.1084.12 4.260 E-6
connector in order to switch the generator to the next point in the list. Afterwards the analyzer
waits for the next
EXT GEN BLANK signal.
If the number of sweep points exceeds the maximum number of entries in the list (depending on
the generator type), the analyzer must interrupt the sweep in order to send a new list and
complete the stimulus information. This generally slows down the measurement.
Reference frequency
To ensure frequency accuracy and frequency stability in a test setup where different devices represent
the signal sources and receivers, it is generally advisable to use a common reference frequency.
Accurate frequencies are particularly important if external generators are used for measurements with
narrow measurement bandwidths.
A common reference frequency can be established in different ways:
•
Use the analyzer as master device: Set the analyzer to Internal reference frequency mode and
operate all other devices in external reference mode using the reference clock signal from the
10 MHz REF connector on the analyzer's rear panel.
•
Use another device as master: Set the analyzer to External reference and synchronize it (and
all other devices) to the master's reference clock signal, fed in at the 10 MHz REF connector on
the analyzer's rear panel.
•
The 10 MHz REF settings in the Add External Generator dialog are generator-specific and not
overwritten by a change of the global Internal Reference / External Reference settings.
Remote control: SYSTem:COMMunicate:RDEVice:GENerator<gen_no>:DEFine
Int. Reference
Selects the internal reference clock for synchronization. The analyzer provides a 10 MHz internal
reference clock which can be tapped off at the 10 MHz REF connector at the rear of the instrument in
order to synchronize other devices, e.g. signal generators or a second network analyzer of the ZVAB
family. See also example for reference frequency settings for external generators.
Remote control: [SENSe<Ch>:]ROSCillator[:SOURce] INTernal
Ext. Reference
Selects an external reference clock signal for synchronization. The external 10 MHz reference clock
signal must be applied to the 10 MHz REF connector at the rear of the instrument. The external
reference signal must meet the specifications of the data sheet. The internal reference signal is
synchronized to the external signal. See also example for reference frequency settings for external
generators.
Remote control:
[SENSe<Ch>:]ROSCillator[:SOURce] EXTernal