Hitachi ZA3000 Series, Instruction Manual

Page: 439 / 522

10.1 Setting of Temperature Program Test Conditions
10 - 14
REF detection start level
REF detection end level
Ashing - Background
Detection
start
Detection
end
Ashing
5s
Reference signal
Time(s)
Fig. 10-10 Background Detection in the Ash Test
NOTES : 1. Background detection may fail because the
reference signal does not rise adequately depending
on the kind of sample, sample injection volume,
measuring wavelength, cuvette type, etc.
In this case, the same ashing time as the [Ramp
Time (s)] value set in an ashing test will be
adopted.
2. Generally, a sample containing much concomitant
matter tends to cause a rise in the reference signal
at the ashing stage.
On the other hand, the reference signal may be
too low to detect depending on a sample
containing an extremely small amount of
concomitant matter or measuring wavelength.
In such cases, the same ashing time as the [Ramp
Time (s)] value set in an ashing test will be
adopted.
3. Shortly after turning on the light source lamp, the
reference signal fluctuates due to a change in the
lamp energy.
The lamp requires a warm-up period of about 10
minutes after turning it on. Measurement should
be started after the reference signal has stabilized.