TA I
NSTRUMENTS
TGA 2950 B–45
Hi-Res
TM
Option
Sensitivity setting controls the response of the
Hi-Res
TM
system to changes in the rate of
reaction (%/minute). Larger sensitivity settings
cause the system to be more reactive or sensi-
tive to small changes in the rate of the reaction.
Lower sensitivity settings dampen this response.
Generally, it is best to adjust resolution setting
first with sensitivity set to a low value, and then
after a good result is obtained, try increasing
sensitivity to see if any resolution improvement
can be obtained.
Use caution when adjusting sensitivity since
over adjustment can cause oscillation or anoma-
lies in the weight versus temperature curve.
Adjusting Sensitivity
in Dynamic Rate Mode
In dynamic rate Hi-Res
TM
mode (positive
resolution settings), the sensitivity setting is
used to further increase the resolution of some
transitions once an appropriate resolution setting
has been determined. This is accomplished by
narrowing the range of percent/minute values
over which the heating rate is proportionally
varied. Higher sensitivity settings result in
progressively narrower percent/minute ranges
and generally increased resolution.
In this mode the resolution setting selects the
general neighborhood of percent/minute values
that will drive changes in furnace heating rate.
For example, resolution setting 3.0 selects the
neighborhood of approximately 1.0 to 20.0%/
minute for most of the variation in heating rate.
Whereas, setting 4.5 selects 0.1 to 2.0%/minute.
Sensitivity setting controls the relative width of
To Next Page
Loading...
