Velleman DVM8681 Manual Del Usuario página 7

7.3 Automatic Temperature Compensation (ATC)
1. Since pH values are temperature dependent, pH applications
require some form of temperature compensation to ensure
standardized pH values. This meter automatically corrects
the pH values based on the temperature of the measured
solution.
2. Hold CAL and PWR simultaneously pressed
before power-on. "°C" or "°F" will appear
on the display. Select your temperature unit
with HLD and press CAL to save.
3. "SA" will briefly appear on the display to
indicate the selection has been saved. This
selection will be saved after power-off.
7.4 Calibrating your Meter
1. Calibration is necessary and should be done regularly, even
on a daily basis when using the meter often.
2. Switch on your pH meter.
3. Place the electrode into the pH 4 test
solution (available at your chemist's) and
press CAL to enter the calibration mode.
"CA" will briefly appear on the display. After
a few seconds "CAL" and the pH value will
appear on the display indicating the meter
has been calibrated.
4. Do the same with the pH 7 and pH 10 test solutions.
5. The meter will display "En" if the calibration
was not done correctly or if the probe could
not detect the test solution in the voltage
range below. In this case, recalibrate as per
above.
pH 4.00
pH 7.00
pH 10.00
V. 03 – 15/10/2018
DVM8681
-250 mV....-97 mV
7
97 mV....250 mV
-60 mV....60 mV
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