Distortion Meter Accuracy - Marconi Instruments TF 2337A Instruction Manual

Test
equipment required
:
Oscillator
AC
voltmeter
b)
Connect
the
TF
2337A
as
shovm
in
Fig. 4.1.
c)
Select the
TF
2337A
controls as follows
:
-
Function switcH
«
LEVEL
Level
rang'e'
Switch
-IV
d)
Adjust
the output
frequency
of the oscillator to
760
Hz
and adjust
the output
until the
TF
2337A
level
meter
reads
full-scale.
e)
Select the
TF
2337A
controls as follows
Function switch -
Press
the
CAL
and 400 Hz
push-buttons
simultaneously.
f)
Note
the indication of distortion of the
TF
2337A,
vary
the frequency
of the oscillator
from
760
Hz
to 10
kHz.
(The
output
voltage from
the oscillator
should be kept constant.
Ensure
that the distortion meter
of the
TF
2337A does
not
vary more
than ±0.3 dB.
g)
Select the
TF
2337A
controls as follows
:
Function switch
-
I.EVEL
•
h) Set the frequency
of the oscillator to
1.
9
kHz, and
set the indication cf level
meter
of the
TF
2337A
to
full scale.
i)
Select the following
mode
condition
:
Function switch
-
Press
the
CAL
and 1000 Hz
push-buttons
simulUineously.
j)
Noting
the distortion reading on
the
TF
2337A, vary
the frequency
of the oscillator from
1.9
kHz
to
10 kHz.
(The output
from
the oscillator should be kept constant.)
k)
Confirm
that the
TF
2337A
distortion indication
is constant
within ±0.3 dB.
4.3.5 Distortion
Meter Accuracy
a)
Test equipment
required.
Low
distortion oscillator.
Voltage
calibrator.
Switch box.
TF
2337A