TA I
NSTRUMENTS
TGA 2950 3–5
Calibrating the TGA
To obtain accurate experimental results you
should calibrate the instrument when you first
install it. For the best results, however, you
should recalibrate periodically.
Three types of calibration are needed for the
TGA 2950: temperature, weight, and sample
platform calibration. All three calibration
procedures are performed through the Instru-
ment Control software. This section provides a
brief description of these types of calibration, for
details refer to the online help and documents.
Temperature
Calibration
Temperature calibration is useful for TGA
experiments in which precise transition
temperatures are essential. To temperature
calibrate the TGA, you need to analyze a high-
purity magnetic standard for its curie tempera-
ture, and then enter the observed and correct
values in the temperature calibration table (see
the online help and documentation for further
information). The standard most often used is
nickel with a curie temperature of 354.4°C
(NIST Certificate for GM761). The observed
and correct temperatures correspond to the
experimental and theoretical transition tempera-
tures (e.g., curie temperature) of the calibrant.
From one to five temperature calibration points
(pairs of observed and correct temperature
points) can be entered in the calibration table.
A multiple-point calibration is more accurate than
a one-point calibration.
Calibrating the TGA
To Next Page
Loading...
