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SECTION
2
GENERAL
DESCRIPTION
INTRODUCTION
1
The
Racal Instruments
VXIbus
microwave
counter.
Model
2151,
is
a microprocessor-
controlled
instrument
offering
high-accuracy
measurements
with
a
comprehensive range
of
facilities.
These
facilities
include
Automatic/Manual
Operation, Tracking,
Offset,
Multiply,
and
Store
and
Recall. All
the instrument's functions
are controlled
remotely
via the
VXI
interface.
2
The
Racal Instruments
VXIbus
UHF
counter,
Model
2051,
offers
high
accuracy
measurement
over
a reduced frequency
range,
with a
similar
range
of facilities to
those
provided on the
Model
2151.
MEASUREMENT
FUNCTIONS
Frequency
A
Function
3
The
Frequency
A
Function
is
used
to
measure
the frequency of the signal applied
to
INPUT
A.
A
resolution
of
up
to
ten
digits
can be
selected
with
a
gate
time
of
1
millisecond
to
20 seconds depending on
the resolution
selected.
Frequency
B
Function
4
The
Frequency
B
Function
is
used
to
measure
the frequency of the signal applied
to
INPUT
B.
A
resolution
of
up
to
ten
digits
can be
selected
with a gate time
of 1
millisecond
to
20 seconds depending on the
resolution
selected.
Frequency C
Function
(2151 only)
5
The
Frequency
C
Function
is
used
to
measure
the frequency
of the
signal applied
to
INPUT
C.
A
resolution of
0.1
Hz
to 1
MHz
can be
selected
with a gate time
of 1
millisecond
to
10 seconds depending on
the resolution selected
and
frequency
being sampled.
Ratio
C/B Function
(2151 only)
6
The
Ratio
C/B Function
is
used
to
measure
the
ratio of the
frequency applied
to
INPUT
C
to
that applied
to
INPUT
B.
Ratio
C/A
Function
(2151 only)
7
The
Ratio
C/A
Function
is
used
to
measure
the
ratio of
the
frequency
applied
to
INPUT
C
to
that applied
to
INPUT
A.
Ratio
B/A
Function
8
The
Ratio
B/A
Function
is
used
to
measure
the
ratio of
the
frequency
applied
to
INPUT
B
to
that applied
to
INPUT
A.
2151
OPS
A1571/DA
2-1
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