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GENERAL RADIO COMPANY
5..4 RECTIFIER DIODE RESISTANCE.
In order to prevent excessive rf distortion from the output rectifier,
it is important that the reverse resistance of the diode used be reason-
ably high. Diodes are easily damaged by excessive voltage (refer to
paragraph 3.1.1), and the reverse resistance is usually decreased by
such abuse.
Since the normal calibration procedure does not show up
this defect unless
it
is severe, ohmmeter checks of reverse resistance
should be made frequently. For best performance, diodes whose reverse
resistance is less than 40 kilohms should be replaced. Type 1N23B di-
odes are used in both the Type 874-VR Voltmeter Rectifier and the Type
874-VQ Voltmeter Detector.
Section
6
SERVICE
AND
MAINTENANCE
6.1 GENERAL.
The two-year warranty given with every General Radio instrument
attests the quality of materials and workmanship
in
our products. When
difficulties do occur, our service engineers will assist in any way pos-
sible.
In case of difficulties that cannot be eliminated by the use of these
service instructions, please write or phone our Service Department, giving
full information of the trouble and of steps taken to remedy it. Be sure
to mention the serial and type numbers of the instrument.
Before returning an instrument to. General Radio for service, please
write to our Service Department or nearest District Office (see back cov-
er), requesting a Returned Material Tag.
Use of this tag will ensure
proper handling and identification.
For instruments not covered by the
warranty, a purchase order should be forwarded to avoid unnecessary de-
lay.
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