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
