Minelab GPX-4000 Service Manual download pdf (Page 36)

66 67Motion

Adjusting Sweep Speed

The speed at which you sweep the coil has an

effect on target response time and Ground Balance

adjustment. Matching your preferred coil sweep

speed with the corresponding Motion setting can

reduce noise.

Very Slow and Slow

When carefully detecting a small area, a slow Motion

setting will allow for maximum depth and sensitivity

to small targets. Slow Motion can be used in

combination with a higher Gain and Deep or Boost

Audio Type to achieve maximum performance.

Range

Factory Preset

Very Slow, Slow, Medium, Fast

Patch Med General Slow Deep V. Slow

Medium

Is ideal for general detecting when normal 'slow &

low’ techniques are being used.

Fast

Fast is useful when using a fast sweep speed to cover

ground quickly. In these circumstances, a quick

sharp target response is used to alert the operator

to a target. Fast will often have more ground noise

but will allow you to cover more ground in a shorter

amount of time.

Note: The Motion speed also effects how susceptible

the detector is to external interference. Basically the

slower the Motion speed, the less interference you will

get, resulting in a smoother Threshold.

If you are using a Fast Motion and the Threshold is too

unstable, you can either select Quiet Audio Type

(pg. 64) or reduce Gain (pg. 65).

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Minelab GPX-4000 Service Manual Page 36