M P H Industries Inc SDRRK02 ユーザーズマニュアル

 

9 

 

 
When the RANGER is first turned on, it will go through a complete self test.  The radar will first 
perform a light test, in which all of the display's indicators will light, and then the radar will 
perform a 32 mph internal circuitry test.   
 

 
A tuning fork test is the standard test for proving that the antenna and counting unit are functioning 
properly.  In older analog radars, the dual tuning fork tests actually checked two different circuits, 
one each for patrol and target speeds.  However, the RANGER uses a single circuit, the digital 
signal processor (DSP), to determine both speeds, so that testing the RANGER with a single tuning 
fork in stationary mode actually ensures that the entire radar is working.  Despite this fact, MPH 
recommends that you follow your court-proven department guidelines for performing tuning fork 
checks. 
 
Since the RANGER is a directional radar and the tines of a tuning fork vibrate in both directions, 
tuning fork tests are more complicated than they are with non-directional radars.  Therefore, the 
RANGER has a Tuning Fork Mode, which is used while testing the radar with tuning forks.  In 
this mode, the RANGER works as a non-directional radar, allowing the tuning forks to work 
properly. 
 
Placing the RANGER in Tuning Fork Mode 
 
When a self test is performed on the RANGER by pressing the Test button on the remote control, 
the radar does a segment check and a 32 mph test.  After this, the radar displays an “F” in the 
hundreds digit of the Target window.  This indicates that the radar is in Tuning Fork mode.  The 
radar will stay in Tuning Fork mode for 30 seconds after the self test is complete.  
 
To place the radar in Tuning fork mode for an extended period of time, press the 2

nd

 F button on 

the remote control and then the Test button.  The radar will remain in Tuning Fork mode until it is 
manually taken out of Tuning Fork mode by pressing 2

nd

 F followed by the Test button.  You may 

need to do this to fully test the radar. 
 
Stationary mode tuning fork tests 
 
To perform a stationary mode tuning fork test, place the radar in Tuning Fork mode and strike the 
tuning fork on wood or plastic and hold the ringing fork in a fixed position two or three inches in 
front of the antenna with the narrow edge of the fork facing the antenna front.  This will cause the 
target speed window to display the speed labeled on the fork (+ 1 mph).  While performing the 
tuning fork test, the audio volume level may be set to a desirable level.