Test Facilities

TM 11-5820-509-35

Figure 6-10. Test Fixture for C-4311/PRC-47, Suggested Layout.

subassemblies of the radio set to determine whether the

6-3. Test Facilities

defective circuit has been repaired. If doubt arises as to

A primary power source of 115 volts, 400-Hz, single-

the completeness of the repair procedures, a limited

phase alternating current at approximately 3.0 amperes,

number of performance standards tests will verify circuit

and a 26.6-volt direct current primary power source at

performance.

approximately 16 amperes is required for these tests. In

addition, normal test instrument primary power facilities

6-6. Reference Standards Tests

(60- or 400- Hz) will be required. The test fixtures, or

The following reference standards tests are required to

their equivalent, shown in figures 6-4 through 6-10, will

provide

assurance

that

satisfactory

operating

be required.

parameters have been maintained or restored as a

result of depot overhaul procedures. Each group of

6-4. Modification Work Orders

tests, performed on a specific modular subassembly, is

The performance standards listed in the following tests

conducted using the test fixture for that module together

assume that all modification work orders (MWO's) have

with the equipment configuration specified in the

been performed. Consult DA Pam 310-7 for a list of

procedure.

Certain initial conditions must be

MWO's for Radio Set AN/PRC-47.

established before the performance tests and reference

standards can be judiciously compared.

Unless

6-5. Physical Tests and Inspection

specified, all tests shall be performed in the order listed

Perform

general

inspection

all

modular

in the procedures to avoid ambiguity.

6-8