A-80 UHF SERVICE MANUAL
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Adjustment
Required test Equipment
1．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．DC Ammeter
1．Class 1 ammeter (17ranges and other features).
2．The full scale can be set to either 300mA or 3A.
3．A cable of less internal loss must to be used.
3．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．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．RF Voltmeter(RF V.M)
1．Frequency range：up to 500MHz or so.
6．Linear Detector
1．Frequency range：up to 500MHz or so.
2．Characteristics are flat, CN is 60dB or more.
7．Digital Voltmeter
1．Voltage range：FS=18V or so.
2．Input resistance: 1MΩ or more
8．Oscillograph
1．Measuring range：DC to 30MHZ。
2．Provide highly accurate measurements for5 to 25MHz.
9．AF Voltmeter (AF V.M)
1．Measuring range：50Hz to 1MHz
2．Maximum sensitivity：1mV or more.
10．Spectrum Analyzer
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