White’s Electronics Spectra VX3 - Manual (Page 47)

Page 4-10
Spectra VX 3 User’s Guide
Discrimination Audio
Unlike the all-metal channel, the discrimination channel
does not treat all targets alike. Discrimination uses the VDI
(phase) response of the target to determine how to respond. It is
possible to assign different tones to different VDI responses, or
to completely ignore targets with certain VDI responses.
Discrimination Sensitivity
In this channel, the Discrimination Sensitivity setting deter-
mines a threshold level above which you will hear target
responses. In many detectors, this setting is simply called
Threshold, but VX
3 has separate adjustments for each channel.
The following graph shows the relationship between the thresh-
old level and the detection signal. Only detection signals that
exceed the threshold level (shaded in gray) will become audible
target signals. Otherwise, you will only hear the threshold tone.
Increasing the Discrimination Sensitivity setting lowers the
threshold, making VX 3 more sensitive to weak target signals.
Like All-Metal Sensitivity , this can also increase the amount of
audio noise, and can make VX 3 more chattery, especially when
EMI is present.
Threshold Volume
The loudness of the discrimination threshold tone is set by
the Audio  Audio Threshold control. Setting the threshold vol-
ume all the way to zero will result in silent-search (no threshold
tone).
Target Volume
Audio  Target Volume adjusts the volume for the target
response (that is, the target beep) in discrimination mode. The
Threshold
Detection Signal
Audible Signals