testo 252 Bedienungsanleitung Seite 96

Continue
calibration:
2 point
calibration
24
Manual calibration with any chosen buffer solutions
1 pt calibration ok?
Cancel
page 49
Measuring mode
2 point calibration
Should you require a more accurate calibration,
continue calibration.
You will be asked for the temperature value after
every further point of calibration. Correct if
necessary with the arrow keys, confirm the entry
with Enter.
Enter a second buffer value (via the arrow keys).
A difference of ±0.5 pH units must lie
between the individual buffers. The instrument
blocks this area automatically. Confirm this
buffer value with Enter.
CAL dAtA
pH measurement
Press the page key to
cancel the calibration mode
1 point calibration has
been completed. This is the
quickest way of adapting the
instrument to the pH elec-
trode (accuracy after 1 point
calibration: approx. ± 0.1 pH
units). A slope of -58 mV/pH
(25 °C) is assumed and only
the zero point is calibrated.
You can return to the
measuring mode via the
display of the calibration
data (please read about the
importance of the calibration
data on page 49).