Tektronix 2247A

Operators Familiarization
Connecting
Input
Signals
Grounding
The
most
reliable
signal
measurements
are
made
when
the
2247A
and
the
unit
under
test
are
connected
by
a
common
reference
(ground
lead)
in
addition
to
the
single
lead
or
probe.
The
ground
lead
of
the
probe
provides
the
best
grounding
method
for
signal
interconnection
and
ensures
the
maximum
amount
of
signal-lead
shielding
in
the
probe
cable.
A
separate
ground
lead
(with
a
banana
plug)
can
also
be
connected
from
the
unit
under
test
to
the
2247A
ground
Jack
on
the
front
panel.
Probes
A
probe
provides
the
most
convenient
way
to
connect
an
Input
signal
to
the
oscilloscope.
The
standard
10X
probes
supplied
with
the
2247A
are
shielded
against
electromagnetic
Interference
and
have
a
high
input
impedance
for
low
circult
loading.
The
subminiature
probe
bodies
are
designed
for
probing
circuitry
with
closely
spaced
leads.
SCALE
FACTOR
SWITCHING.
The
VOLTS/DIV
scale
factors,
displayed
on the
ert,
reflect
the
probe attenuation
factor
when
Tektronix
coded
probes
are
used.
OPERATING
CONSIDERATIONS.
To
get
the
best
waveform
fidelity,
keep
probe
ground
and
signal
leads
as
short
as
possible,
Misadjusted
probe
compensation
can
cause
measurement
error.
Check
and
adjust
probe
compensation
whenever
a
Probe
is
moved
to
a
different
channel
or
oscilloscope.
For
the
probe
compensation
adjustment
pro-
cedure,
see
Section
4,
“Operator
Checks
and
Adjustments.”
For
detailed
operating
considerations
and
probe
maintenance,
see
the
Instruction
sheet
supplied
with
the
probe.
Coaxial Cables
Signal
Input
cable
can
greatly
affect
the
accuracy
of
a
displayed
waveform.
To
maintain
original
frequency
characteristics
of
the
input
signal,
use
only
high-quality,
low-loss
coaxial
cables.
Coaxial
cables
must
be
terminated
at
both
ends
In
their
characteristic
Impedance
to
prevent
signal
reflections
within
the
cable.
Use
suitable
Impedance-matching
devices.
2247A Operators
ES
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