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(Fig. 14, Fig. 15)
Page 5-2 Table 5
Millivoltmeter
(HP.400E)
Item
7
Audio
Signal
Generator
(1
kHZ)
Item
9
Digital
Frequency Meter
(Counter)
Item 10
5.14
Procedure
(1)
On
the
UUT
set
the following controls:-
OUTPUT
switch
to
NORMAL.
AM
switch
to
EXT.
METER
switch
to
AM
100%.
(2)
Connect
the
1kHz
audio generator
to
the
AM
600Q
external
input
socket of the
UUT
(3)
Using the
HP.400E
millivoltmeter monitor the
level
of
the
audio generator
and
adjust
for
an
input of
0.8V
r.m.s.
(4)
Adjust R8,
on p.c.b. 19-0847,
for
reading of 8
on
the top
scale of the
UUT
meter.
(5)
Set the
UUT
AM
switch
to
I
NT
and
the
MODULATION
FREQUENCY
switch
to
1kHz.
(6)
Monitor
the
UUT
rear
panel audio output socket, using the
HP.400E
millivoltmeter,
and
adjust
R20 on p.c.b. 19-0847
to
give
a
reading
of
1
.00V,
±0.01V,
on
the millivoltmeter.
(7)
Select the
4Q0Hz
and
5kHz
internal
modulation frequencies
in
turn
and
verify that the
reading
on
the millivoltmeter
does
not
change by more
than
±0.5dB.
(8)
Connect
a
digital
frequency counter
to
the
UUT
rear
panel audio
output socket.
Select
each
of the
internal
modulation frequencies
in
turn
and
verify the
following counter readings:-
400Hz
(380
-
420Hz)
1
kHz
(950
-
1050Hz)
5kHz
(4750
-
5250Hz)
(9)
Disconnect the audio
signal
generator
and
millivoltmeter.
AUDIO
OSCILLATOR ASSEMBLY
19-0847
Test
Equipment Required
9081
&
9082 Vol
.
2
5-13
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