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PRIOR
TO ADJUSTMENTS
= MEASURING
INSTRUMENTS
1) Voltmeter
o
Input resistance
More than 1MaQ
o Range {AC, DC)
1.5V to 1000V F.S.
{[Note]
When
no suitable measuring
instrument
is available, any
type
of circuit
tester with
high accuracy
may
be used.
Bear in mind
that the accurate
indication
may
not be
obtained
especially
when
high
impedance
circuit
is
measured by use of such circuit tester.
2)
RF vacuum tube voltmeter
o
Input impedance
More than 1MQ
Less than 20PF
o
Range
10mV to 300V F.S.
o
Frequency
More than 50MHz
[Note]
In case
the adjustment
with
particular
accuracy
is not
required (adjustment of carrier oscillation and heterodyne
crystal and the like), a voltmeter or circuit tester may be
used with the output of wave detector as will be described
later.
3) Sweep generator
©
Center frequency
8.6MHz
o
Frequency deviation
More than +500kHz (max.)
o
Output voltage
More than 0.1V
o
Sweep speed
50Hz or GOHz
o
Marker
8.3MHz, 8.6MHz, and
8.9MHz desirable
4) Detector
20P
500WV
IN6O
o—
>t
'
0
g xia
oO
>
te}
IN
* z
ny
& T
OUT
oO
:
oO
Fig. 1 Filter detector
[Note]
1. Surely use a specified diode.
2. Output must be taken out with a shield wire.
5) Oscilloscope
High sensitivity, external synchronize obtainable.
18
6) Slow sweep generator
oO
Oo
Oo 8
Center frequency
Frequency deviation
Output voltage
Sweep speed
3395kHz
Max. t5kHz
More than 0.1V
Min. 0.5 sec/cm
7) Afterglow oscilloscope
o
Has afterglow characteristic.
More than 1 sec.
Both
vertical
and
horizontal
io)
amplifiers.
8) SSG
°
fe)
9)
°
Frequency
Output
Frequency
Output voltage
Distortion factor
Frequency counter
3MHz to 30MHz
OdB/uV to 120dB/nV
o
High
stable
SSG
with
less
frequency
modulated
component required.
AF
generator
300Hz to 5kHz
Max. 1V
Less than 0.5% (at 1500Hz)
Minimum input voltage Less than 10kHz
Frequency
More than 10MHz
AF vacuum tube voltmeter
Frequency
Input resistance
Range
AF dummy load
Impedance
Power
RF dummy load
!mpedance
Power
Frequency
50Hz to 10kHz
More than 1M2
10mV to 30V FS.
82
More than 3W
502 to 752
More than 200W
3.5MHz ~ 30MHz
amplifiers
are
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