Metrohm 746 VA Trace Analyzer User Manual
Page 137
4 Introduction to the operation
746 VA Trace Analyzer / 747 VA Stand
4-52
14 Storing the calibration data in the method
•
The proportionality factor
Prop.fact.
calculated from the calibration
curve as well as the mean deviation
Mean.dev.
are first stored only in
the method loaded in the working storage. To store these data perma-
nently, this method must be copied to the method memory. Proceed as
follows:
−
Press the yellow
appears showing the methods stored in the instrument.
−
If the
INTSTD.mth
method is secured (an
*
is shown on the left
of the file name), it must first be unsecured. For this, select the
INTSTD.mth
method with the cursor keys. Press the softkey
< >> >
and then the softkey
. The asterisk
next to the file name disappears, the method is unsecured. Then
press the softkey
< >> >
again.
−
Press the softkey
. The softkey bar changes and
presents the sources for copying a method.
−
Press the softkey
. The
INTSTD.mth
method
is copied from the working storage to the method memory; the
method of the same name containing the old calibration data will
be overwritten.
4.4.5
Performing the determination
To perform the lead determination using an internal standard with the aid of the re-
corded calibration curve, the following steps are necessary:
1
Switch to dialog page "MONITORING"
•
Press the yellow
whose header shows the loaded method
INTSTD
appears.
2
Switch the program run mode to
determination
If the parameter
Run mode
is set to
calibration
, proceed as follows:
•
Use the cursor keys to select the field
Run mode
.
•
Press the space bar to enter the edit mode.
•
Press the softkey
and confirm this entry with the
key.
3
Entry of the sample volume
Enter the sample volume as follows:
•
Use the cursor keys to select the first field below the title
Sample
size/S0
.
•
Press the space bar to enter the edit mode.
•
Enter
10 mL
and confirm this entry with the
4
Start the determination
•
Press the red