Ramsey Electronics BS1 Manual de Instruções descarregar pdf (Página 29)

SG7• 29

TESTING AND CALIBRATION:

1. Connect an earphone to J2, using a subminiature plug or adapter.

2. Connect the counter and oscillator units together with the shielded 3-

conductor cable already assembled.

3. While listening to the earphone, plug in the 12 volts DC cord. The LED

displays should light right away. After a few seconds, you should hear a

steady AC buzz in the earphone. Next, if you wave your hand in front of

the open end of the antenna "can", you should hear a rapid series of

clicks. The faster you move your hand toward the unit, the faster the

rate of the clicks. You are hearing the Doppler effect at work.

4. While still indoors, point the unit toward a fluorescent light fixture and

adjust the Calibration pot for an LED reading of 18. This provides a

calibration of the speed counter.

5. It is normal for resistors R23 and R24 to be fairly warm to the touch.

6. The correct Doppler shift at the operating frequency of the SG7 is 7.76

Hz per mile-an-hour.

7. Due to the extreme high gain and sensitivity of the SG7, do remember

that all indoor tests and usages will be affected by powerful AC 60 Hz

power mains, lines and light flux!

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Ramsey Electronics BS1 Manual de Instruções Página 29