Figure 1-14. Test arrangement for longitudinal balance
of input circuit, block diagram.
b. Recording of test data. Data for both tests will be recorded on the
longitudinal balance data sheet shown in figure 1-16.
Each station will
record measurements made on both the send and receive sides of the circuit
under test.
Analyzed data will be recorded on Circuit Parameter Test
Report, DD Form 1697 (figure 3-3).
(1) Input circuit.
(a) Connect the equipment to the input of the circuit under test
as indicated in figure 1-14. Electrical center between the pair of wires is
provided by the transformer secondary. Input and output impedances of the
transformer are both 600 ohms. Since the transformer has a 1:1 turns ratio,
it neither steps up nor steps down the test signal voltage.
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