HP 83480A User Manual

How the Instrument Works
System Architecture
Probe types
There are two common types of probes suitable for use with the HP 83480A,
54750A. Each type has dierent loading eects. There is the low-impedance
resistive divider probe, like the HP 54006A, and there is the active probe,
like the HP 54701A. A third type of probe, the compensated high resistance
passive divider probe, is designed for use with 1 M inputs and is not suitable
for use with the HP 83480-series digital communications analyzer.
Resistive
divider
probes
Resistive
divider
probes are
designed for
analyzers with
a
50
input
impedance
.
The
tip
of
the
probe
has
a
450
or
950
series
resistor.
The
cable
is
designed
for
a
50
transmission
line
.
Because
the
cable
is
terminated
in
50
at
the
analyzer
input,
it
looks
like
a
purely
resistive
50
load
when
viewed
from
the
tip
.
Therefore
the
resistive
divider
is
at
over
a
wide
range of
frequencies
,
limited
primarily
by
the
parasitic
capacitance
and
inductance of
the
450
or
950
resistor
and
the
xture
that
holds
it.
The
input resistance
of
the
probe
to
the
circuit
under
test
is
either
500
or
1
k.
Figure 13-10. Resistive divider probe.
13-18

HP 83480A Specifications

General

Brand	HP
Model	83480A
Category	Measuring Instruments
Language	English