Installation Manual

Table Of Contents
Lynx NGT-9000
Installation Manual
0040-17001-01 (Revision W) Maintenance Page 4-28
4.4.5.3 Noise Monitor
The Noise Monitor screen (see Figure 4-5) displays indications of electrical noise as well as
lightning/atmospheric electrical discharge activity that occurs within electrical range of the WX-500
system. It is used to see if electrical noise that will interfere with normal system operation is present. No
compression is applied to the strikes.
The circle (solid ring) 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 (Clear) button is pressed.
A counter that indicates the number of triggers detected (i.e., electrical discharges including noise and/or
strikes) is shown at the top of the figure. The counter rolls over at 99999, and is reset using the CLR
button. It should be noted that noise can cause triggers, but not result in a strike symbol.
Figure 4-5: Noise Monitor
NOTES
1. Thunderstorm activity within the inner and outer circle will register
on the Noise Monitor and may affect the Test Strike display causing
the test strikes to fall outside the box.
2. The NGT-9000 display refresh rate may delay the appearance of
noise.
1. Press the “Noise Monitor” button to start test (see Figure 4-4).
2. Verify no triggers or strikes are present.
3. Press CLR to erase the screen and then check for electrical noise indications. Compare the results
with the PASS and FAIL instructions listed below.
PASS There should normally be no noise indications inside the solid ring. (A small number of
triggers and/or random noise points inside the displayed ring is acceptable.)
FAIL Reoccurring and/or persistent indications of electrical noise inside the solid ring are
unacceptable (i.e. strikes in same location each time). (Troubleshooting electrical noise is
discussed in in the WX-500 Installation Manual.)
4. If the noise monitor test is satisfactory, perform the Test Strikes test.
5. Press the “Exit” button to return to the Tests Screen.