Type 7415-3 R.F. Coupler and high Pass Filter

signal into all three wires of a
three phase power system. The
Type 9407-1 network provides this capability in a neat little box. The
unit includes a high pass filter for
the elimination of power frequency voltages. Rating of 270 VAC at the LINE terminals and 20 volts rms into the GEN. Port.

Dimensions: 2.88" (73 mm) x 3.06" (78 mm) plus mounting flanges x 2.0" (51 mm) high.

Test Method CS02 requires
injection of the signal from a 50
ohm generator capable of seven volts output. This is equivalent to
a one watt source. There are two conditions which could inhibit
the injection of one volt r.f. into
the Equipment Under Test:

1) If the r.f. impedance looking
into the power terminals of the Equipment Under Test is considerably lower than 50 ohms
at the injection frequency, the injected signal will be shunted
and it may not be possible to achieve the required injection voltage with a one watt source.

 

 

 


Click on chart for larger image.

2) If the connections to the power source are heavily by-passed as in the case of screen room testing, this will also shunt the injection voltage so that the required level cannot be reached. This can be prevented by inserting an inductor in the power line as indicated in Figure 1 and Figure 2. The secondary of the Solar Type 6220-1A Transformer can be used as this inductor.

 

  

Therefore, the test setup must be carefully monitored to keep the signal source from exceeding the required seven volts. If the Equipment Under Test does not malfunction with a seven volt signal from a 50 ohm source, it is deemed to have passed the test. Even though the signal input port of the Type 7415-3 is rated at 20 volts, it is not recommended that the power
of the signal source be increased beyond one watt in an effort to reach a one volt injection level.

 

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