Microwave Data Systems MDS 4310, Установка, эксплуатация и техническое обслуживание на месте

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MDS 05-2415A01, Rev. A 4-1
CHAPTER 4
FIELD TESTS AND ADJUSTMENTS
DANGER
The MDS 4310-HL data transceiver is approved for use in
Class I, Groups ABCD, Division 2, Hazardous Locations.
The installer of these transceivers MUST be familiar with
hazardous location installation guidelines before any instal-
lation or maintenance is begun. Do not begin installation of
or make external connections to this device unless the area
is known to be non-hazardous.
Refer to Appendix H of this manual for further information
on the approved conditions under which the MDS 4310-HL
can be installed in hazardous locations.
GENERAL
This chapter describes field tests and adjustments that can be used to diagnose suspected prob-
lems or evaluate the transceiver after an assembly has been replaced. These tests are not
normally required for new installations (with the exception of checking the supply volt-
age to the radio and testing antenna system performance). Unless otherwise noted, the
procedures given here apply equally to the MDS 4310 transceiver and the MDS 4350/4355
packaged models. For additional set-up information on the MDS 4350 and MDS 4355, refer
to Appendices F and G respectively.
NOTE
All units are tuned at the factory for optimum performance. Do
not re-tune any unit without first checking the performance as
it is. Retuning may not be necessary.
TEST EQUIPMENT REQUIRED
Directional RF Wattmeter—It must be equipped with a plug-in element rated for 10 watts
and 1,000 MHz. A popular directional wattmeter suitable for this service is the Bird
Model 43 Thruline
™
wattmeter with the Bird 10D element.
Service Monitor— This is an instrument that performs the combined functions of RF
and audio signal generator, frequency meter/counter, modulation analyzer and RF
watt–meter. Monitors are typically equipped with an input attenuator/dummy load
that allows the full output of the transmitter to be safely coupled directly to the
instrument. If this last feature is not provided, you will need a separate attenua-
tor/dummy load. Suitable service monitors are manufactured by the IFR Division of
Regency, Inc., Marconi Instruments Ltd., and Hewlett Packard. It is also possible to
use separate test equipment in place of a service monitor, but this may be impractical
for field work.
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