Owner manual

4 Introduction to the operation
746 VA Trace Analyzer / 747 VA Stand
4-34
4.3.4 Recording the calibration curve
Recording of the calibration curve involves the following steps:
1
Switch to dialog page "MONITORING"
• Press the yellow <MONITORING> key. The dialog page "MONITORING"
whose header shows the loaded method CALCRV appears.
2
Switch the program run mode to calibration
If the parameter Run mode is set to determination, 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 <calibr.> and confirm this entry with the <ENTER>
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 either * or 10 mL (as preparation for performance of the determi-
nation in section 4.3.5) and confirm this entry with the <ENTER> key.
Although the sample volume for recording the calibration curve is not needed (the
volume of the calibration solutions is defined in the parameter V0.CSoln), the
Sample size/S0 field must not be empty.
4
Start the determination
• Press the red <START> key.
• The status display in the header of the dialog page "MONITORING"
switches to * BUSY *, the start time of the measurement is entered un-
der Determination and the determination is given a standard name,
also formed from the start time. Further, during the measurement the
measurement window is superimposed which shows the current pro-
gram line being executed and the remaining line time.
• Shortly after the start of the determination, the prompt to add 10 mL of
calibration solution Pb-1 to the measuring vessel appears on the
screen:
5
Addition of 1
st
calibration solution
• Remove stopper 2525 and use a pipette to add 10 mL of calibration
solution Pb-1 with a mass concentration of 2.5 µµg/L to the measuring
vessel through the pipetting opening. Press the <ENTER> key.
• The screen shows the prompt to add 1 mL acetate buffer to the measur-
ing vessel:
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MEAS.TASK MESSAGE
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CSOLN Pb-1 10.000 mL > M
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