Solartron 1260 - High Frequency Measurement Techniques

HIGH
FREQUENCY
MEASUREMENTS
For
drive
frequencies
in the
region
of
1MHz
and
above,
care
must
be
taken
to match
the
input
and
output
impedances
of
the
instrument
and
item
under
test with
the
impedance
of
the
connecting
cables
(500). This
is
to avoid
standing
wave
problems
which
occur
when
the
length
of
the
connecting
cables
is
about
a
quarter-wavelength
of
the
drive
signal
frequency.
Inputs
are
matched
to the
cable
with
500
feedthrough
terminators.
The
generator
output,
when
driving
a
pair of
inputs,
is
connected
through
a
500 power
splitter.
A
typical
application
of
these
devices
is shown
in
Fig
6.5.
FEEDTHROUGH
TERMINATOR
Fig
6.5
Typical
connections
for
high
frequency
voltage
measurements.
6.8
JWS/1
260/1