Cal Settings Menu - DeFelsko PosiTector UTG Guide D'utilisation

Zero
PosiTector UTG probes can be "zeroed" to compensate for
temperature and wear. This action is not required when operating
in multiple-echo mode (UTG M probes only) except when the
instrument is new and after a Reset (pg. 8). However it ensures
best accuracy when operating in SE (single-echo) mode.
Therefore it is a good idea to "Zero" the probe before each work
shift and when the temperature of the part changes. During
zeroing, it does not matter what the current velocity setting is.
1. Make sure the Gage is ON and the probe is wiped clean.
2. Apply a single drop of couplant onto the zero plate located on
the underside of the probe connector. DO NOT apply couplant
directly onto the probe face.
3. Select the Zero menu option and follow the on-screen prompts.
Calibration Adjustment
The PosiTector UTG is factory calibrated. But in order for it to
take accurate thickness measurements of a particular material it
must be set to the correct sound velocity for that material.
aware that material composition (and thus its sound velocity) can
vary from stated tables and even between lots from a
manufacturer. Adjustment to a sample of known thickness of the
material to be measured ensures that the Gage is adjusted as
close as possible to the sound velocity of that specific material.
Samples should be flat, smooth and as thick as the maximum
expected thickness of the piece to be tested.
The PosiTector UTG allows four simple adjustment choices.
All four methods are based on the simple premise of adjusting
the sound velocity. The first three adjustment methods make
1-point calibration adjustments to optimize the linearity of the
PosiTector UTG over small ranges. The fourth method makes
a 2-point calibration adjustment to allow for greater accuracy
over a large range.

Cal Settings Menu

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