Gain Buttons; Help Button - CDI CD42 Instruction Manual

The graphical display of the CD42-R allows us to show the pulses of the transmitter to the operator in
the most intuitive way possible, and is the key to the CD42‟s ease of use.
Each of the six buttons on the face of the receiver unit has a function associated with it. The function of
each button may change as you navigate through the receiver‟s menu system; as the functions change,
the icons are updated to reflect the new functions. Therefore, by referring to the small icon on the
display adjacent to the button, the user always knows the function of each of the buttons.

Gain Buttons

The Gain control icons are located in the upper right of the CD42‟s display. These two
buttons control the sensitivity of the receiver to the transmitter‟s magnetic field. The "up"
button with the plus sign on it causes the receiver to become more sensitive, and the "down"
button with the minus sign on it causes the system to become less sensitive. As you press
these two buttons you will hear a chirp from the system indicating that the button was
pressed, and you should also notice the text "Gain x" near the center of the display change
as you make adjustments. The Gain is adjustable from 1 to 9, with 1 being the least
sensitive and 9 being the most sensitive.
Figure 15
Gain Icons
The reason the sensitivity adjustment is necessary is that there are situations in which the
system can receive magnetic interference from the environment. One such source of
interference is an automobile in close range to the system. By allowing the operator to control the
system‟s sensitivity, he can adjust the sensitivity to fit his surroundings and his work habits. Normally
a good starting Gain value is 5. At a Gain of 5 the system can be operated while walking with no
difficulty or possibility of missing a transmitter‟s signal. At very high Gain settings, it may be
necessary to be careful of bumping and jarring the antenna as you walk. This is normal and is a side
effect of using magnetics for pig location and tracking.

Help Button

Pressing the help button allows the operator to receive brief help on the functions of the Main
Menu buttons. These buttons are "File", "Setup", "Record", "Gain Up/Down" and "Help".
Figure 16
Help Icon
To use Help, simply press the Help button. A text screen well appear asking you which Main Menu
button you would like help with. Pressing the button that you would like help with will display
information on that button. Figure 17 is an example display of Help for the Setup button.
CD42 Pipeline Pig Location & Tracking System
Page 16