Measurement Principles
R&S
®
RT-ZS10E/10/20/30
29
User Manual 1410.3531.02 ─ 07
4.1.2
Connection Inductance
The connection inductance L
con
is caused by connecting the probe to the DUT. In
contrast to the probe-specific bandwidth, the connection inductance mainly
depends on the selected type.
The connection inductance:
●
Increases with the length of the connection and the size of the resulting loop
area A.
See
Figure 4-4
.
●
Reduces the usable bandwidth and causes ringing with signals having a short
rise time, due to a series resonance with the input capacitance.
●
Must be as small as possible (short lead length) to maintain high signal integ-
rity.
●
Long leads on the signal input are especially problematic.
con
in
con
resonance
con
L
BW
C
L
f
A
L
1
to
al
proportion
2
1
≈
to
al
proportion
Figure 4-4: Ground connection and connection inductance
The following
Table 4-2
shows different types of connection between probe and
DUT as well as the associated connection inductance L
con
and the step respon-
ses.
Signal Integrity of the Transferred Signal
