Tektronix P6137 - Operating Considerations

P6137 10X Passive Probe Instructions
1
Operating Considerations
This manual provides the information necessary to begin making measurements
with your P6137 probe. Topics are presented in the following order:
H Operating Considerations—Information about using the probe.
H Specifications—Characteristics of the probe.
H Adjustment/Maintenance—Instructions for cleaning the probe and
replacing major assemblies.
H Replaceable Parts—Exploded views of the probe and replaceable parts lists.
Adverse Effects of Ground Lead Inductance
Ground Lead inductance can significantly reduce the performance of a probe. As
shown in Figure 1, the ground lead inserts a series inductance into the signal path
forming a series-resonant circuit between C
in
of the probe and ground lead L,
with only R
source
as damping. This forms a resonant circuit with:
f
0
+ 1 B (2p LC
Ǹ
)
Figure 1: Schematic representation of probe
A six-inch ground lead has [180 MHz, which is within the mid-frequency
response of the instrument. This greatly degrades rise time, bandwidth, and
transient accuracy (see Figure 2). For best results, make sure that the ground lead
inductance is at a minimum.