Another extension of scale reading is used in the
electronic digital caliper. These battery-operated devices not only count the distance
traveled by the movable jaw and display the count on a digital
readout, but they also provide ports for computer cables, so that
the data can easily be used in statistical process control
(SPC).
Because the digital display makes the instrument even easier to
read, electronic digital calipers are very useful for
less-experienced users. Their greatest benefit, however, is the
computer connection. You can set the measurement system to the
other.
Electronic digital calipers use a floating zero, which allows you
to make any point within the scale range the reference, setting it
to zero. The digital readout then displays either minus or plus
deviations in the jaw movement, so you do not have to do
calculations, which inherently and error.
Also, electronic digital calipers provide calibration, including
the user’s gaging force for measurement. In the limit mode, the
instrument automatically warns when any measurement is above or
below the tolerance; in the peak mode, the instrument recalls from
memory the maximum and minimum measurements in a series.
Finally, electronic digital calipers allow you to directly connect
with other electronic devices. You can directly print a record of
measurements if you are connected to a printer, or you can
interface with a computer for (SPC) data collection.