Metrohm 719 S Titrino - Manual (Page 23)

2.4 Tutorial
719 S Titrino
19
If the previous titration has run to your satisfaction, you can start thinking about perform-
ing statistics calculations. Have you already added a new sample to the titration vessel? If
you are no longer certain, you can find out immediately with <MEAS/HOLD>.
Rapid measurement between titrations
Press <MEAS/HOLD>. The pH value of your sample is displayed. You can stop the
measurement with a second <MEAS/HOLD>.
Statistics calculations
Now switch on the statistics calculations. Press <STATISTICS>. The "Statistics" LED is
on. Duplicate determinations are now performed.
• Perform 2 titrations.
After the second titration you receive a printout with statistics calculations:
If you have no printer connected, you can view the mean value and standard deviation:
• Press <SELECT> until "display mean" appears in the display.
• With <ENTER> you obtain the mean value.
• A second <ENTER> displays the number of single values which have been used for
the mean calculation.
• If you press <SELECT> again, the display "display std.deviation" appears. Once
again, you can view this value, by pressing <ENTER>.
Perhaps you have noticed that the two values differ too greatly? In any case, we shall per-
form a third determination with the same sample. The result of this determination will be
another value which is incorporated in the statistics calculations.
Addition of more determinations for the statistics calculations
5 × <PARAM>
<ENTER>
<ENTER>
• Press <PARAM> until the display shows:
• Statistics calculations can be switched on either with
the <STATISTICS> key or in the inquiry "status:".
We shall leave them switched on and proceed to the
next inquiry.
parameters
>statistics
>statistics
status: ON
'fr
719 S Titrino 18200 719.0021
date 2002-03-13 time 17:34 3
pHc(init) 6.29 SET pH Acid
EP1 0.0628 ml 4.26
m value 5.02 mmol/l
mean(2) +/s s/%
m value 5.04 0.028 mmol/l 0.56
==============