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WX-950
Installation Manual
Figure 4-6. CRT Test Pattern
Press the EXIT key to return to the Service Menu. Softkeys (B), (C), and (D) are not used.
4.4.4 Noise Monitor
The noise monitor screen (see figure 4-7) displays indications of electrical noise as well as lightning/
atmospheric electrical discharge activity that occurs within electrical range of the system. It is checked to
see if electrical noise, that will interfere with normal system operation, is present. No compression is
Figure 4-7. Noise Monitor
applied to the strikes. Also displayed is a circle (solid ring) that provides a reference for an acceptable
noise level. No range markings are displayed. Old data is removed (bumped off) after 3 minutes, or when
the CLR button is pressed. A five digit counter that indicates the number of triggers detected (i.e, electrical
discharges including noise and/or strikes) is displayed at the top of the screen. The counter rolls over at
4-6
Rev. C
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