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SECTION
4
OPERATION
VIA
THE
VXI
INTRODUCTION
1
The
instrument
must
be prepared
for
use
and
the functional
check done
in
accordance with
the
instructions
given
in Section
3.
DESCRIPTION
OF
FRONT
PANEL
CONNECTORS
AND
INDICATORS
Reference
Item
Description
1
POWER
Indicator
(Green)
Lights
when
the instrument
is
switched
on.
2
FAILED
Indicator
(Red)
Lights to indicate
that the
instrument has
failed
its
self test.
3
ACTIVE
Indicator
(Amber)
Lights
while data
transfer
between
a
VXI
commander
and
the instrument
is
in
progress.
4
GATE
Indicator
(Green)
Lights
while
a
measurement
cycle
is
in
progress.
5
EXT.
STANDARD
INPUT
10MHz
A
BNC
female connector
for
connecting
a
10
MHz
external
frequency
standard.
6
INT
STD
ADJUST
This
aperture provides
access
to
allow
adjustment
of
the
internal
frequency
standard.
7
10
MHz STANDARD
OUTPUT
A
BNC
female connector
providing
a
10
MHz
signal
locked
to
the
frequency standard
in
use.
8
INPUT
B
Connector
BNC
female fused connector
for
inputs
from 40
MHz
to
1300
MHz
(2151) or
Type
'N'
female connector
for
80
MHz
to 2.6
GHz
(2051).
2151
OPS
A1571/DA
4-1
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