Time Constant Setting - Hitachi CHROMASTER 5160 Instruction Manual

3.2.2 Time constant setting

♦ 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)).
(a) Offset is not used
Fig. 3-2
(4) Offset setting is now completed and the 1
returns.
Though no value is indicated for FL, "+*" will be displayed
when selecting a value other than 0.
<1st monitor screen>
TIME Ex
0.0 250
Specify electrical response time.
(1) Press the
(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)
0
-10 mV
Example of Offsetting
Em FL
350 0.0+∗
SET UP
UTLTY
key.
3 - 9
(b) Offset is used
st
monitor screen
PROG LAMP [I]
1 Xe