Indicators; Rear Panel Items - Racal Instruments 9901 Maintenance Manual

INDICATORS
OVERFLOW:
GATE:
REAR
PANEL
ITEMS
1
MHz O/P
Socket:
Data Output Connector;
Power
Plug:
Power
Fuse;
Osc.
Adjust:
The
OVERFLOW
indicator
will
illuminate
when
the
count exceeds
the
capacity of
the
display.
The
GATE
indicator illuminates
when
the
counter gate
is
'open'
,
Thus the illumination
period
is
related
to
gate time
selected.
A
1
MHz
reference signal
derived from
the
frequency standard
in
use
is
available
at this
BNC
socket.
The
facilities
provided by
the
28-way edge
connector
are
listed in
Table
1
in
the
Technical Specification (supplement)
at the
front of the
book.
A
three-core
power
lead
is
supplied with the
instrument.
Fuse ratings are
annotated on the rear panel
.
This
aperture provides access
to
the calibration
adjustment
in
the 5
MHz
oscillator.
In
a few
early
models
the standard oscillator
is
mounted
on
the
main p.c.b.
2-9
9901 Vol.
1