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SECTION III: VISUAL AND AUDIBLE INDICATORS
Gain Level Indicator:
The gain range is indicated by a
4-segment LCD as shown in Figure 4: L (Low), M
(Medium), H (High) and XH (Extra High). Upon turn on,
the gain defaults to M (Medium). Each press of the UP
or DOWN arrow buttons will cause the gain level
indicator to change accordingly.
Figure 4: Gain Level Indicators
Battery Level Indicator:
The battery level is indicated by a 4-segment LCD indicator, as
shown in Figure 5. When all four segments are black, the voltage level is between 100% and
75%. As the voltage decreases, the number of black
segments decreases. Battery life varies with usage and
the ambient temperature. Cold temperatures reduce
battery life. Low temperatures may result in only two or
three segments being black. This could be temporary,
and all segments will change to black as the temperature
increases.
Figure 5: Battery Voltage Status Indicators
Signal Strength and Polarity Indicator:
The signal strength, defined as the difference (or
delta Δ) between the magnetic field detected at the top and bottom sensors, is shown as a
numerical indication in mG (milligauss) units, is preceded by the polarity of the signal (+ or -),
and is followed by the Δ symbol (to emphasize that it represents a “difference” between the
two ends of the sensor array).
In addition, the signal strength is shown in
a semi-circular bar graph, with more bars
indicating a stronger signal. Depending
on polarity, the bar graph will switch to the
+ (right) or – (left) side. The signal
strength is also indicated by the
frequency of the audio signal; a higher
audio frequency indicates a stronger
signal.
Figure 6 shows the various visual
indications of signal strength and polarity.
Figure 6: Signal Strength Visual Indications
