5 Aligning probe sensitivity
When calibrating the sensitivity of the probe con-
nected to C1, the probe is used to record the
measured values at two measuring points that
are known to be a certain distance apart. Gage
blocks and setting masters of various sizes are
particularly suited to this purpose and can be
used to calibrate the entire measuring chain. This
means that production-related deviations in sen-
sitivity affecting both the display and probe can
be measured and corrected. The setting mas-
ters and/or gage blocks should differ by at least
500 µm for a Millimar C 1216 with a measuring
range of ± 2000 µm. For measurements within
a range of ±200 µm, or for the Millimar C 1208
resp. C 1240, the difference should be at least
100 µm.
Probe sensitivity is subject to variations caused
during production. These variations are usually
less than 0.5 %. Deviations such as this can be
tolerated for many measuring tasks. In these
instances, there is no need to align sensitivity.
However, in the case of differential measure-
ments (C1-C2), these deviations can distort mea-
surement results to an unacceptable extent.
The sensitivity of the display is also
subject to variations caused during
production processes. If only the
Millimar display is to be calibrated,
a nominal value selector (e.g. the
1283 WN) can be attached to the
C 1208/C 1216/C 1240 instead of
the probe. However, to enable pre-
cise measurements, the entire mea-
suring chain should be calibrated.
The C 1208/C 1216/C 1240 offers two options
for correcting these deviations – firstly, the sig-
nals of both probes/channels can be multiplied
with a common factor, or secondly, the sensitivity
of the probe connected to C1 can be determined
(calibrated) then the sensitivity of the probe con-
nected to C2 aligned to that of the first probe.
To Next Page
Loading...
Need help?
General
