R&S
®
ZVA/ZVB/ZVT Channel Menu
1145.1084.12 4.235 E-6
Auto Length
Adds an electrical length offset to the active test port with the condition that the residual delay of the
active trace (defined as the negative derivative of the phase response) is minimized across the entire
sweep range. If Delay is the selected trace format, the entire trace is shifted in vertical direction and
centered around zero. The Auto Length corrected trace shows the deviation from linear phase. The
effect of a dispersive connector type (i.e. a waveguide; see Offset Model dialog) assigned to the active
test port is taken into account.
The active test port number is defined as the port index in the numerator of the measured quantity. If
the active trace shows an S-parameter S
ij
, then Auto Length adds a length offset at port i, which is the
receive port of the analyzer. The added length offset is valid for all traces associated with the active test
port.
Preconditions for Auto Length, effect on measured quantities and exceptions
Auto Length is enabled if the measured quantity contains the necessary phase information as a
function of the frequency, and if the interpretation of the results is unambiguous:
• A frequency sweep must be active.
• The measured quantity must be an S-parameter, ratio, wave quantity, a converted
impedance or a converted admittance.
The effect of Auto Length on S-parameters, wave quantities and ratios is to eliminate a linear
phase response as described above. Converted admittances or impedances are calculated
from the corresponding Auto Length corrected S-parameters. Y-parameters, Z-parameters and
stability factors are not derived from a single S-parameter, therefore Auto Length is disabled.
Auto Length for logical ports
The Auto Length function can be used for balanced port configurations as well. If the active test
port is a logical port, then the same length offset is assigned to both physical ports that are
combined to form the logical port. If different length offsets have been assigned to the physical
ports before, they are both corrected by the same amount.
Use Zero Delay at Marker to set the delay at a special trace point to zero.
Remote control:
[SENSe<Ch>:]CORRection:EDELay<port_no>:AUTO ONCE
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