Hitachi ZA3000 Series Instruction Manual page 46

 Time Constant
The time constant expresses the degree of signal
smoothing. A larger time constant provides a reduced
noise but a damped rise of the signal.
A value of 1.0 second is normally used for flame
analysis, and need not be changed. When there is
much noise in the signal, a value of 2.0 may be better.
Available settings: 0.02, 0.05, 0.1, 0.2, 0.5, 1.0, 2.0,
 Lamp Current
By default, the optimum value for the set element is
assigned. There is no need for change usually.
When using a lamp made by another maker or a multi-
element lamp, use the recommendations provided in the
instruction manual of each lamp.
Input range: 1.0 to 20.0 mA
By clicking the check mark
check box, the lamp current is turned OFF (used in
flame photometry mode).
 PMT Voltage
Specifies a voltage at which to start the search for an
optimum photomultiplier voltage in the automatic setting
of lamp energy. Normally the optimum value is preset
for the set element, and need not be changed.
Since the optimum voltage will be searched for
automatically even if the PMT voltage setting is changed,
the PMT voltage at measurement will not vary. If the
PMT voltage at measurement differs largely from the
setting, specification of a value close to the
measurement voltage will shorten the condition setting
time.
Input range: 1 to 1000 V
 Absorbance Decimal Place
Normally this is set at "4 digit". "5 digit" may be set for
detecting a very small change in absorbance when there
is very little noise, for instance. The decimal place can
be changed after completion of the measurement.
3 - 7
5.0, 10.0, 20.0
to delete it from the
3.1.4