Rohde & Schwarz ZNB20, Руководство пользователя

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GUI Reference
R&S
®
ZNB/ZNBT
578 User Manual 1173.9163.02 ─ 38
Max. DUT Measure Delay / Max. El. Length / Max. Mech. Length
Defines the "length" of the DUT, which can either be specified as delay, electrical
length, or mechanical length.
Given the DUT's permittivity ε
r
, these alternative "length" parameters are related by
r mech
r mech
L Length Electrical
c
L
Delay


 


;
i.e. setting one of them determines the other two.
Note: The length of the DUT determines the appropriate start frequency and step size
of the frequency sweep. It is important that the user enters a value that is at least as
high as the actual one. A higher value is acceptable as long as the resulting start fre-
quency is not below the analyzer's minimum frequency, which would be rejected by the
analyzer firmware.
Remote command:
[SENSe<Ch>:]HARMonic:DLENgth:DATA
[SENSe<Ch>:]HARMonic:ELENgth:DATA
[SENSe<Ch>:]HARMonic:MLENgth:DATA
Permittivity / Velocity Factor
Specifies the (relative) permittivity ε
r
of the DUT or, alternatively, its velocity factor 1/
sqrt(ε
r
).
The velocity factor is a measure for the velocity of an electromagnetic wave in a dielec-
tric with permittivity ε
r
, relative to its velocity in a vacuum (velocity factor < 1).
Permittivity and velocity factor are coupled parameters, i.e. setting one of them deter-
mines the other. A higher permittitivity implies a smaller mechanical length, but leaves
delay and electrical length unchanged (see
Max. DUT Measure Delay / Max. El.
Length / Max. Mech. Length ).
Remote command:
[SENSe<Ch>:]HARMonic:PERMittivity:DATA
[SENSe<Ch>:]HARMonic:VELocity:DATA
Rise Time Definition
Selects between rise time definitions 10%-90% (default) and 20%-80%.
Remote command:
[SENSe<Ch>:]HARMonic:RTIMe:THReshold
Rise Time
This is the minimum rise time (according to the selected Rise Time Definition ) the user
wishes to measure on the DUT.
This in turn determines the stop frequency of the frequency sweep: the smaller the
"Rise Time", the larger the stop frequency. If it is set too small, the resulting stop fre-
quency will be above the analyzer's maximum frequency, which would be rejected by
the analyzer firmware.
Remote command:
[SENSe<Ch>:]HARMonic:RTIMe:DATA
Applic Softtool