ABELL A-82 UHF Service Manual
第
16
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共
41
页
ADJUSTMENT
Required test Equipment
1
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Stability power supply
1)
．
The supply voltage can be changed between 5V and 18V, and the current is 3A or more.
2)
．
The standard voltage is 7.5V
2
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．
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DC Ammeter
1). Class 1 ammeter (17ranges and other features).
2). The full scare can be set to either 300mA or 3A.
3). A cable of less internal loss must to be used.
3
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Frequency counter (F. Counter)
1)
．
Frequency of 1GHz or so can be measured.
2)
．
The sensitive can be changed to 500MHz or blow, and measurements are highly stable and accurate.
(about 0.2ppm).
4
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Power Meter
1). Measurable frequency
：
Up to 500MHz
2). Impedance
：
50Ω, instability.
3). Measuring range
：
full scare of 10W or so.
4). A standard cable (5D2W 1m) must be used.
5
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RF Voltmeter(RF V.M)
1)
．
Frequency range
：
up to 500MHz or so.
6
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Linear Detector
1). Frequency range
：
up to 500MHz or so.
2). Characteristics are flat, CN is 60dB or more.
7
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．
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Digital Voltmeter
1). Voltage range
：
FS=18V or so.
2). Input resistance: 1MΩ or more.
8
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．
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Oscillograph
1). Measuring range
：
DC to 30MHZ.
2). Provide highly accurate measurements for5 to 25MHz.
9
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．
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AF Voltmeter (AF V.M)
1). Measuring range
：
50Hz to 1MHz
2). Maximum sensitivity
：
1mV or more.
