d) Set' the frequency control to 2.0 and adjust VR2
for a reading
of
20.0kHz ± 0.8kHz.
e)
Set the frequency control
to
1.0 and check the
frequency
is
10.QkHz
± 0.8kH
z.
f) Set the frequericy control to 0.6 and check the
frequency
is
6.0kHz ± 0.8kHz.
g) Set the .frequency control
;,t
o_
1_.5
and check the
frequency
is
15.0kHz ± 0.8kHz.
h)
Select the 1MHz range.
i)
Set the frequency control fully clockwise and
check that the frequency is greater than
2MHz.
j)
Set the frequency control to 2.0 and check the
frequency
is
2.0MHz. ±
OOkHz
.
.
kl
Set the frequency control
to
0.2 and check the
frequency
is
200kHz ±
OOkHz.
I)
If
the frequency
is
outside the specified limits
adjust
VR2
and VR4 and repeat steps a)
to
kl
until
the frequency is within specification.
7.Sinewave
a)
Monitor TP10
with
an oscilloscope using a x10
probe. ·
b)
Set the frequency range
to
1kHz.and frequency
control
to
1.0.
,:
,
c)
Selectthesine,wavefunction. -·-,.
d) Set
VR12,
13~
·14; ,
15,
1
1'Er
'
fo
their:mi~ positions.
e) Adjust
VR14
tq
,give a peak -
to
peak amplitude
of
~
1V
".
·,
, · . - ,,· · J :
. ' , ' '
..
-
f) Adjust
VR16
,
to
gjve
'.
rt'li!limum offset i.e. the
positi
ve
. and~ negative ;
peal<s
sv.nimetrical about
ground
..
·
..
·i
·
.,
g) Adjust
VR12
.and VR13
tQ
produce .the best sine
wave trace
~m
the oscilloscope.
h) · Adjust
VR14
to give a
sine
wave amplitude ·
of
1V
p-p.
8.
Sinewave Distortion
a)
Measure
.·
the sinewave distortion
at
the 50
outpu.t with apistortioo
ao,alv.ser.
. .LC •
b) Adjust
VR12
and VR13 fqr < 0.
5%
distortion.
Note· that:adjusting
VR
,
12
,
~1td
VR
-
13
may
change
the signal amplitude,
re
-adjt.ist.VR14.as necessary
to maintain-the amplitude a
t.1
.Vp
•p. ·
P.)
. I
9.
Amplitude Calibration
a)
Monitor the
50
!2
output
with
.an
oscilloscope.
b) Select trianglewave.
c)
Set the. frequency to 1kHz and.the amplitude
to
20Vp-
p.
.
d) Select the sinewave and adjust VR14
to
give an
amplitude
of
20Vp-p.
~
.«;)
) Select the squarewave and·adjust VR15
to
give an
amplitude
of
20Vp-p.
6
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