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1.2.6
1
.
2
.
6.1
1.2.7
Ratio
A/B
Ratio
A/B
is
used
to
measure
the
frequency
ratio
between
Inputs
A
and
B,
Ratio
C/B
1.2. 7.1
When
Option
41
is
installed,
Ratio
C/B
is
used
to
measure
the
frequency
ratio
between
Inputs
C
and
B.
1.2.8
Rise/Fall
A
1,2.
8.1
Rise
A
and
Fall
A
are automatically
measured
using
positive
and
negative
slope
selection, respectively.
1.2.9
Pulse
Width
A
1.2, 9.1
Positive
and negative Pulse Widths
A
are automatically
measured
using
positive
and negative
slope selection, respectively.
1.2.10
Phase
A
rel
B
1.2.10.1
Phase
A
rel
B
is
used
to
measure
the
phase
difference
between
the
waveform
applied
to Inputs
A
and
B.
The
phase difference
is
displayed
in
degrees,
and
indicates the
phase
lead at Input
A.
1
.
2.11
Check
1.2.11.1
The Check
function enables
a
number
of functional
tests
of the instrument's
circuits to
be
made
without the use of
additional test
equipment. For example,
the
1994
can measure
its
own
10
MHz
internal
reference
standard.
Although
these
tests
do not
check
the instrument's
performance
to
published specifications,
they
can
be used
to
verify that the
equipment
is
operating
correctly following receipt or transportation
to
a
new
location.
The Check
function
can be extended
using special functions
(see
Subsection
3.4.8) to
provide
a
comprehensive range
of
self tests.
1.3
SIGNAL INPUT
CHANNELS
1.3.1
Inputs
A
and
B
are
fully
independent, but
provision
is
made
for
connection
of
Input A's signal
into
both channels
(common
mode).
When
this
is
done, Input
B's
socket
is
isolated
from Channel
B.
1.3.2
Both
Inputs
A
and
B
are provided with independent controls
to
permit
selection
of:
1
.
2
.
3.
4.
5.
AC
or
DC
input coupling
1M12
or 5012
input
impedance
XI
or
X10
input attenuation
Positive or
negative-slope
trigger
Manual
or
automatic
setting
of
input trigger level
1-2
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