Lesson 3/Learning Event 3
Learning Event 3: TRANSMISSION IMPAIRMENT MEASURING SET, MODEL 4940A
Transmission impairment measuring test set, Model 4940A shown in
figure 3 is designed to measure data handling capability of voice
communication channels.
Figure 3.
Transmission Impairment Measuring Set (TIMS) HP Model 4940A
The TIMS is one of the latest impairment test sets acquired by the
Army for testing communication circuits. It can be used to test 16 or more
different parameter tests.
The standard model is mounted in a fiberglass
case, however it can be rack mounted if the rack mounting kit is requested
from the factory when the test set is purchased. The test set is divided
into two main sections, the transmit and receive. The transmit section is
used to transmit the test signals required to perform any of the 16 tests
you wish to perform. The receive section is used to measure any of the 16
receive test signals and has the capability of giving you a digital readout
of three parameters at one time.
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