Probe Zero - Elcometer 204 Operating Instructions Manual

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4 PROBE ZERO

Setting the Zero Point (Probe Zero) of your gauge is important for the same reason that setting the zero on
a mechanical micrometer is important. If the gauge is not 'zeroed' correctly, all the measurements the gauge
makes will be in error by a fixed amount. When your gauge is zeroed, this fixed error value is measured and
automatically corrected for in all subsequent measurements. To zero your gauge:
1. Switch on the gauge and connect the transducer.
2. Check that the wearface of the transducer is clean and free of any debris.
3. On the top of your gauge, above the display, is the battery compartment cover. This metal disc is also
used when zeroing your gauge. Apply a single drop of ultrasonic couplant to the face of this disc.
4. Press the transducer against the disc, making sure that the
transducer sits flat against the surface of the disc. The
display should show some thickness value, and the
Stability Indicator should have nearly all its bars
illuminated.
5. While the transducer is firmly coupled to the disc, press the
PRB-0 key on the keypad. The display will show 'Prb0'
while it is calculating its zero point.
6. Remove the transducer from the probe-disc.
At this point, your gauge has successfully calculated it's internal error factor, and will compensate for this
value in any subsequent measurements. Though the Elcometer 204 will remember the last probe-zero
performed, it is generally a good idea to perform a probe-zero whenever the gauge is turned on. This will
ensure that the instrument is always correctly zeroed.
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Elcometer 204