Hitachi CHROMASTER 5160, Instruction Manual

Page: 469 / 1022

♦
Typically, the negative input limit for an integrator or data
processor is approximately -10 mV.
If the baseline decreases below this level, it becomes
impossible to integrate the peaks in the chromatogram
(see Fig. 3-2 (a)).
In such a case, the offset function is used to adjust the
shifted baseline to the allowable input signal range of
the data processor (see Fig. 3-2 (b)).
0
-10 mV
(a) Offset is not used (b) Offset is used
Fig. 3-2 Example of Offsetting
(4) Offset setting is now completed and the 1
st
monitor screen
returns.
Though no value is indicated for FL, “+*” will be displayed
when selecting a value other than 0.
<1st monitor screen>
TIME Ex Em FL PROG LAMP [I]
0.0 250 350 0.0+
∗
1 Xe
3.2.2 Time constant setting
Specify electrical response time.
(1) Press the
UTLTY
SET UP
key.
(2) The following display will be presented.
<Utility initial screen>
UTILITY (OFFSET=1, TIME CONSTANT=2,
_2
USE PROG=3, PMT VOLT=4, OTHERS=5)
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