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4.3.1
Level
Meter Accuracy
(a)
Test equipment required
:
Voltage
calibrator.
(b)
Check
that
the
instrument
is
correctly adjusted for the
mains
voltage
in
use as
'
described
in
Chapter
2.
4. 1.
Set
controls
of the
TF
2337A
Automatic
Distortion
Meter
as follows
:
Function
sVdtch
-
LEVEL
(c)
Connect
the voltage
calibrator
to the input
terminals
of the
TF
2337A.
(d)
Set the output
frequency
from
the voltage
calibrator
to
1000 Hz.
(e)
By
using
the
voltage calibrator check'the
level
meter
at
f.
s.d.
on every
LEVEL
range.
The
accuracy
of level
range
should be
within
±
2
%,
(f)
Set the
Level
Range
of the
TF
2337A'to'
1
V.
(g)
By
using
the
voltage calibrator,
check
the
scale
shape
of the level
meter, varying
the
voltage
by increments
of
0.1
V
from
0.1
V
to
1
V.
The
scale
shape
of the level
meter
should
be
within
±2%
of
full
scale.
(h)
Reduce
the
mains
voltage
by
10%
and repeat steps
(e)
to
(g).
Increase
the'
mains
voltage
to the
nominal
voltage plus
10%
and repeat
steps
(e)
to
(g).
4.3.2
Level
Meter
Frequency Response
Fig.
4.1
Level
Meter Frequency response cheek
(a)
Test equipment required
:
Oscillator and
AC
voltmeter.
(b)
Connect
the
TF
2337A
as
shown
in
Fig.
4.1.
(c)
Set the
TF
2377A
controls
as
follows
Function
switch
..
LEVEL
Level range
switch
-
IV
vd)
Set the oscillator
frequency
to
1000 Hz,
adjust the output
so
that the
TF
2337A
Level
Meter
reads
full
scale.
Note
;he oscillator output
as
monitored by
the
AC
voltmeter.
(e)
Keep
the output
from
the oscillator
constant
and vary
the
frequency
from
20
Hz
to
20 kHz.
(0
Ensure
that the
frequency response
of the level
meter
of the
TF
2337A
is
within
i3% over
the
frequency range
20
Hz
to
20 kHz.
TF
2337A
17
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