20
Quad pH/mV Amp
Delete unwanted units by choosing Delete Unit… from the pop-up
menu.
Set the number of decimal places to be displayed for cursor readings of
the calibrated signal, by clicking the arrows,
, (
Figure
3–1
and
Figure 3–2
).
To preview the signal with the new units, click the
button.You
can apply and cancel the units conversion without losing the values you
have entered by clicking the
buttons. To apply the
changes to the channel and return to the Chart window, click the
button. To abandon the changes click the
button.
Ionic Charge
Use the
pop-up menu,
Figure 3–7
, to select the value for the
number of electrons transferred at the electrode. This usually
corresponds to the charge of the ion and thus for pH, sodium, or
potassium measurements
n
= +1; for magnesium or calcium
n
= +2;
while for halides, or nitrate
n
= –1.
The value of
n
is used to calculate the response of the electrode using
the Nernst equation, and
must
be set correctly to obtain a valid
calibration.
Enter the unit
name
Units pop-up menu
Figure 3–6
Defining new unit names
Figure 3–7
The Ionic Charge pop-up
menu
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