3
To disconnect a probe from a body, power-down the
instrument and slide the plastic probe connector
horizontally (in the direction of the arrow) away from the
body. Reverse these steps to attach a new probe.
When powered-up, the PosiTector automatically
determines which type of probe is attached and does a
self-check.
The supplied probe tip has a 60° angle to comply with most test
standards including ASTM D 4417 B. An optional 30° angle tip
with replacement tool is available for special applications or to
comply with Australian Standard AS 3894.5.
Calibration
Instrument calibration is typically done by the manufacturer or
qualified lab. All probes include a Certificate of Calibration.
Verification of Accuracy
Instrument accuracy is verified using the included metal shim and glass
zero plate. Ensure that the glass plate and shim are clean and dirt free
before use.
Place the plate onto a stable, flat surface. Take several measurements. If
the average is greater than ±5 µm (0.2 mil), zero the instrument (see
below).
Next, place the metal shim over the glass plate and measure ensuring the
probe needle touches the glass plate in the area between the shim’s “legs”.
The average of several measurements should be within the combined
tolerances of both the gage and the shim. If not, see Returning for Service
(pg. 8). Metric example: gage tolerance is ±5% or ±5 µm whichever is
greater. The 76 µm shim tolerance is ±5 µm. So the average of several
measurements should be between 66 and 86 microns. Inch example: gage
tolerance is ±5% or ±0.2 mils whichever is greater. The 3 mil shim tolerance
is ±0.2 mils. So the average of several measurements should be between
2.6 and 3.4 mils.
Probe
Zeroing the Instrument
The PosiTector SPG has only one adjustment point at zero. The
zero point can be set using one of two methods. Both methods are
found under the Zero menu option.
