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4) Precalibration Procedure Steps
INJECTION OF CURRENT INTO EQUIPMENT CABLES PROCEDURE
The equipment test shall be applied to individual wires and entire cables as
required by the specifications.
A test procedure will be prepared that identifies each wire and cable to be
tested.
In all cases of injected current, the test configuration used shall be as
shown in Figure 3.
The broadband current probe shall be placed at the specified distance from
the injection probe. This distance is approximately 5 cm for most
specifications.
EQUIPMENT PROCEDURE TEST STEPS
1) Carry out the Precalibration Procedure Steps again in this test
configuration and record the current from the broadband current probe.
A.H. Systems inc. – January 2017
REV B
a)
An accept/reject level of current which should not cause a
malfunction in the equipment under test.
b)
A level of current which will cause a malfunction in the
equipment under test, without creating permanent damage to
it, or the specification level.
a)
Increase the test signal to the injection probe until the
accept/reject level of current is flowing in the calibration
fixture.
b)
Record the forward power and reverse power necessary to
generate the accept/reject level of current.
c)
Increase the test signal until the specification levels of current
are achieved.
d)
Record the forward power and reverse power necessary to
generate the specification levels of current.
e)
Repeat steps 1-4 over the required frequency range. The
calibration frequency range can extend from 10 kHz to 400
MHz.
f)
The forward power in steps 1-4 identifies the total power from
the amplifier required to achieve the necessary current levels.
The reverse power permits the ability to 1) establish the
VSWR of injection probe, 2) the power forward - power
reverse establishes the net power delivered to the load
attached to the calibration fixture.
g)
The test report shall document steps 1-4 data.
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