Metrohm 757 VA Computrace User Manual

Page 161

7.7 Calibration curve technique

757 VA Computrace – Software

151

15. Enter the

Calibration curve id

(used as part of the determina-

tion file name) in the

START CALIBRATION

window and click

16. Each time an addition is required in the

MANUAL ADDITION

window, add the standard solution using a pipette.

Record calibration curve manually with solution exchange

This method is used for recording a calibration curve using differ-
ent calibration solutions of known concentration. Proceed as fol-
lows:

1. Click on

MAIN WINDOW

/ Mode / Determination

2. Click on

MAIN WINDOW

/ Window / Working method

specification

to open the

WORKING METHOD SPECIFICATIONS

window.

3. Load the desired method into the

WORKING METHOD SPECIFI-

CATIONS

window (see How to load a method).

4. Select

Record calibration curve

in the

Calibration

field of the

WORKING METHOD SPECIFICATIONS

window.

5. Select

Manual

in the

Addition

field of the

WORKING METHOD

SPECIFICATIONS

window.

6. Select

Batch with solution exchange

in the

Technique

field of the

WORKING METHOD SPECIFICATIONS

window.

7. Click

to open the

EDIT WORKING METHOD PA-

RAMETERS

window.

8. Select the

Determination

tab (see section 5.2) and enter the

Cell volume

and the number of calibration solutions in the

No.

of cells

field.

9. Select the

Substances

tab (see section 5.2) and make sure

that for each substance entered in the table the concentra-
tions of the calibration solutions are defined in the

CELL

CONCENTRATIONS

window which is opened by clicking on the

button.

10. Close the

EDIT WORKING METHOD PARAMETERS

window by

clicking

11. Place the first calibration solution in the measuring vessel at

the 757 VA Computrace Stand.

12. Click on

MAIN WINDOW

/ Window / Monitor

to open the

MONITOR

window.