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4.1
INTRODUCTION
This
chapter contains information on
performance
checks and
calibration procedures..
Performance
limits
quoted are
for
guidance
only
and should
not
be
taken as guaranteed perfor-
mance
specification unless they
are also quoted
in the
Data
Summary
(Chapter
1.2).
I,n
case
of
difficulties that
cannofTSe'
resolved
with
the aid
of this
manual, please
contact
our
Service Division
at the
address
stated
on
the
back
cover, or
your
nearest
Marconi
Instruments repre-
sentative quoting the type
and
serial
number
of the
instrument.
If
the
instrument
is
being returned
for
repair, please
indicate clearly the
nature
of
the
fault
or
the
work
you
require
to
be
done.
4.1
ACCESS
Access
to
the
instrument can
be
achieved
by
rotating the
two knurled knobs on
the side
of
the
instrument
in
the direction indicated adjacent
to the
knobs which
will
release
the
top
and bottom
panels.
4.3
PERFORMANCE CHECKS
The
tests
in this
section
may
be used
as a
routine
maintenance procedure
to
verify
the
main
per-
formance parameters
of
the
instrument.
All tests
can be completed
without
removing
the case.
If
adjustment
becomes
necessary
the
appropriate procedures are
detailed
in the
repair
section
Chapter
5.
Equipment
required
•
•f.
'
•
,
Instrument
Required
specification
Voltage
calibrator
AC
voltage
range
:
100
mV
to
100
V
r.m.
s.
e.g.
,
Bradley 125C
Low
distortion oscillator
Frequency range
:
20
Hz
to
20
kHz.
Distortion
^0.
01%
e.g.
TF
2100/1
Ml
AC
voltmeter
Voltage range
:
100
mV
to
100
V
r.
m.
s.
Frequency range
;
20
Hz
to
20
kHz
\
e.g.
TF
2G71
DC
voltmeter
Voltage range
:
0 to
±2
volts
L-C
meter
Capacitance range
:
0 to
70
pF
e.g.
TF
1313A
Counter,
Frequency range
:
20
Hz
to
20
kHz
e.g.
TF
2417
Switch
box
.
See
Fig.
4.
Resistor
Resistance
:
100
fixed
carbon
film
Variable
mains
voltage
transformer
Voltage range
;
90
V
to
1
27
V
or
1
80
1
%
V
to
253
V
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