36THRESHOLD
Threshold is the constant background sound produced by the detector to help distinguish between desirable and undesirable targets.
When a rejected target is detected, the Threshold sound ‘blanks’ (becomes silent) to indicate that a rejected target is underneath the coil.
Normal Signal
Threshold
‘Blanking’ (No Sound)
Threshold
Speaker/Headphone Threshold
The
The Threshold volume should be set to the preferred level. It is important to note that small surface objects, as well as large deep objects, will produce very small changes in the Threshold sound. It is therefore important to set the Threshold control correctly to ensure that these targets are heard. Try experimenting with known targets to assist in setting this control.
Press MENU SELECT and choose Threshold.
Use the + and – buttons to select a suitable Threshold level.
Press PINPOINT DETECT, to return to detection.
ADJUSTING THRESHOLD 37
(Accessories, pg. 50).
When the headphones are unplugged, all changes to the Threshold setting are applied to the speaker Threshold. When the headphones are plugged in, the headphones icon will be displayed and all changes to the Threshold setting are applied to the headphones Threshold.
The tone of the Threshold can be
Audible Target Response |
Volume |
= 30 |
Target #2 |
Inaudible |
Target #1 |
Threshold |
= |
If the Threshold is set to a negative value,
small target signals will not produce a signal big enough to go above the Threshold of audibility.
Volume | Audible Target Response |
| |
= 30 |
|
| Target #2 |
| Target #1 |
Threshold |
|
= |
|
If the Threshold is set to 0, the Threshold audio/sound is disabled and detector will produce target signals sounds only.
Audible Target Response |
Volume |
= 30 |
Target #2 |
Target #1 |
Threshold |
= |
If the Threshold is set to a positive value, the detector will produce target signals and a Threshold sound.
adjusted in Prospecting Mode only (Threshold Tone, pg. 38).
When Threshold and Volume settings are used together, there is greater control over target audio response.