GE AutoSigma 3000 DL, Technical Reference, Operating Manual, Page: 36 / 68

The absolute accuracy of the instrument will be depen-
dent on the accuracy of the user reference blocks and
will no longer be to the accuracy stated in the “Speci-
fi cations” chapter of these instructions. It is not rec-
ommended that measurements are made outside the
range of the two sample values; as the accuracy will
be totally dependent on the absolute accuracy of the
user reference blocks.
For the relative reading accuracy to be the same as
for GE Inspection Technologies STD blocks, the two
user reference block values must be accurate and lie
either side of the measurement range. e.g. If the mea-
surement range is to be between 40 and 45 % IACS
then STD 1 should ideally be 50 % IACS or more and
STD 2 should be 35 % IACS or less.
It is possible to set the AutoSigma 3000 DL by using
one user reference block and one STD block, provided
that the above rules are complied with, the absolute
accuracy will again be dependent on the accuracy of
the user reference block.
5.5 Probe setting (SET PROBE)
Before the probe setting on the reference blocks can
take place, the value of the blocks must be entered in
the STD 1 and STD 2 menu slots in the units selected
(i.e. IACS or MS/m) The probe code must also be ap-
propriate to the probe in use. Proceed following sec-
tion 5.4 to set the reference block values. Then with
the instrument on and in the Measurement mode:
Entering reference block values
Operation
5 - 6
Issue 04, 06/2007 AutoSigma 3000