NF WF1945B, Instruction Manual

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7-2
WF1945B
7.1 Outline
„
Work contents
The following types of maintenance are required in order to use the equipment in optimum condition.
z
Inspection Check that the equipment is operating correctly.
z
Performance tests Check that the equipment meets specifications.
z Adjustment and calibration When the equipment does not meet specifications, it is adjusted
and calibrated in order to restore performance at the manufacturer.
z Service Cause and location of failure are investigated and repair is
conducted at the company.
This instruction manual provides easily carried out procedures for inspection and performance checks.
Consult the manufacturer or dealer regarding more thorough inspection, adjustment, calibration and repair.
Do not remove external covers.
Internal inspection of this equipment must be performed only by a trained service
technician who is fully aware of the hazards involved.
„
Required test instruments
The following equipment is required for inspection and performance tests.
z Oscilloscope At least 100 MHz bandwidth
z
Universal counter Reference oscillator accuracy better than 5
×
10
−
7
z DC voltmeter Accuracy better than 0.1 %
z
AC voltmeter 1 True rms, accuracy better than 0.3 %, bandwidth at least 100kHz,
recommended: Keithley Model 2001
z
AC voltmeter 2 True rms, accuracy better than 1 %, bandwidth at least 20MHz,
recommended: Boonton Model 9200C+952002
z
Distortion meter Full scale 0.1 %, frequency up to 100 kHz
z 50
Ω
feed through terminator
z
50
Ω
20 dB attenuator
! WARNING