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Discrimination, Discrimination -14, Spectra vx – White’s Electronics Spectra VX3 User Manual

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Page 4-14

Spectra VX

3

User’s Guide

pull and hold the pinpoint trigger switch or flip it to the forward
position. Pinpoint audio is identical to all-metal audio with one
exception: normal all-metal mode has SAT applied to it, and
pinpoint does not. That means the all-metal channel requires
loop motion or the target will get “tuned out,” but pinpoint does
not require loop motion.

Pinpoint audio has only one option,

VCO

, which is the same

as with the all-metal search mode.

Discrimination

A primary feature of practically all detectors since the

1970’s has been discrimination. VX

3

is no different. Discrimi-

nation, of course, allows us to accept or ignore certain targets
based on their phase (or VDI) response. In analog detectors, this
is accomplished with a knob that sets the threshold point of dis-
crimination; everything below the threshold is rejected, and
everything above is accepted.

Modern digital detectors take discrimination to a higher

level, allowing the user to accept and reject narrow VDI
regions. VX

3

has a discrimination resolution that allows individ-

ual VDI number to be accepted or rejected. The Discrimination
menu is:

Unlike the Disc entry on the Live Control Bar, the Disc

menu includes the icons assigned to each VDI, making it a little