Sierra Super Trac Owner’s Guide
The ST display and reference label below the display pro-
vide a wealth of information about the metal target. The
display information works best after the solid repeatable
audio”beep”.
The display will momentarily show a software version and
battery voltage immediately after the SENS knob is turned
“on”. The ST operates on a twelve volt battery system, new
quality batteries will indicate 12 + volts. After 35 to 40 hours
of operation “Low Bat” will start appearing on the display at
8 volts and below. If using rechargeable batteries 8 volts is
the end of their performance. If you are using quality alkaline
batteries you do have a small reserve after 8 volts. Quality
alkaline batteries will provide extended normal performance
well after the “Low Bat” warning.
The ST provides 5 different significant indications on the
display.
1. VDI = number-
The VDI (Visual Discrimination In-
dication) is a reference number dictated mostly by the metal
targets exact alloy, size, and shape. The reference label
below the display provides a comparison of known targets
and their common VDI numbers. Different metal targets may
share the same VDI numbers based on their electrical char-
acteristics. VDI numbers from -95 to +94 are available and
cover the entire range of alloys and sizes.
The ST has seven distinct tone ranges that
correspond directly to the types of targets
indicated on the display. The lower the tone,
the lower the VDI number. The lowest tone is a
“grunt” on iron targets. The highest tone is on
large silver coins
.
Visual Display-
VDI number on display
VDI number range on reference label
