Superior Signal Company LLC
AccuTrak
®
VPX-WR
User’s Manual
© 2015
5
OPERATION
Due to the high degree of sophistication in its circuitry, the operation of the VPX-WR is
extremely simple. Automatic Frequency Tuning (DND), makes it possible to detect and
interpret a broad range of ultrasound, while utilizing only one control.
In addition to DND, a narrow frequency band of ultrasound is translated using
heterodyning, and it functions just below the set point of the DND. The DND frees the user
from having to tune the instrument for different frequencies, and it provides a distinctively
different sound especially when searching for vacuum leaks.
To use the VPX-WR, put the headset on, with the cloth band over your head and the metal
behind. Align the red dots between the headset connector and the connector in the back
of the instrument, and push them together.
CAUTION !
Be VERY careful while wearing the headset around machinery. The headset is also a
hearing protector attenuating the background noise which can make you think there is no
machine motion. Additionally keep track of the cable between the VPX-WR and the
headset so that it does not get caught in machinery parts.
Turn the knob, slowly clockwise until it stops. The ON light will illuminate to show that the
instrument is ON. At this setting the instrument is set now to maximum sensitivity & low
level noise rejection, and it is ready to search for a leak. The graph below shows the way
the DND works and the interaction of the two signal processors. The DND in addition to
the automatic tuning acts like a dynamic noise discriminator by cutting off signals below
its threshold. As you can see in the graph signals that exceed this level but then fall below
it will be tracked for a few milliseconds to help you not lose the signal and get back to the
correct location of the leak.
