Detect Wi-Fi signal strength in Mac OS X Lion System

The Mac OS X Lion system detects Wi-Fi signal strength. Many fans often think that Wi-Fi wireless access is slow at home, but they do not know whether the router is placed incorrectly. In fact, the Mac OS X Lion system has a built-in Wi-Fi signal strength detection tool by default, with this tool, you can easily find the best signal location for the wireless router.
This tool is called "Wi-Fi diagnosis", but its location is relatively deep. Press the shortcut key "Command + Shift + G" in the Finder and enter the path "/System/Library/CoreServices/". Then, you can find the "Wi-Fi diagnostic" tool in the folder. Double-click the Wi-Fi diagnostic tool and select the first item "monitor running performance" in the window. After the next step, the screen shown in the diagram shown in this article appears. The yellow lines represent the signal strength, green lines represent noise. The higher the position of the Yellow Line (the lower the negative number), the better the signal. The lower the position of the Green Line, the lower the noise ).
Therefore, if you find that the yellow line is in a very high position and the green line is in a very low position, it proves that there is no problem with the placement of your router and the signal is very good. If this is not the case, you can try to adjust the router location, and the curve in the figure will change in real time, which is very convenient. Testing the Wi-Fi signal strength in OS X 10.8 Mountain Lion is now available in Mountain Lion and cannot be achieved using the previous method. Therefore, I would like to share it with you separately.
 
Under OS X 10.8 Mountain Lion, you can press and hold the option key to click the WiFi connection icon in the upper-right corner of the screen, and then click "enable WiFi diagnosis ". After the "WiFI diagnosis" tool is turned on, press command + n to open the "Network utility". In the dynamic chart, the Wi-Fi signal strength is detected in real time.