User Manual

Multi 3500i Operation

Calibration points Calibration can be performed using one, two or three buffer solutions in

any order (single-point, two-point or three-point calibration). The mea-

suring instrument determines the following values and calculates the

calibration line as follows:

Note

You can display the slope in the units, mV/pH or % (see section 4.3.3).

AutoRead In calibration, the AutoRead function is automatically activated.

The current AutoRead measurement can be terminated at any time

(accepting the current value).

Calibration record When finishing a calibration, the new calibration values are displayed

as an informative message (

i symbol) first. Then you can decide

whether you want to take over these values of the new calibration or

whether you want to continue measuring with the old calibration data.

After accepting the new calibration values the calibration record is dis-

played.

Determined

values

Displayed calibration data

1-point ASY z Asymmetry = ASY

z Slope = Nernst slope

(-59.16 mV/pH at 25 °C)

2-point ASY

SLO

z Asymmetry = ASY

z Slope = SLO

3-point ASY

SLO

z Asymmetry = ASY

z Slope = SLO

The calibration line is calculated

by linear regression.