EN-28
Ohaus Discovery
3.5.11 Pipette Calibration
Pipette calibration checks the accuracy and precision values of pipettes by weight analysis. The balance is capable of recording data of each
pipette tested. The density table for water is included. If other liquids are used for pipette calibration, you must enter the liquid’s density in g/cc
at current room temperature. Since all calculations are made within the balance, it is also required that you know the atmospheric pressure. A
printout can be made which specifies all parameters of the calibration made. Parameters include test liquid, liquid density, H2O temperature,
barometer unit, barometer pressure, nominal and nominal units have to be set first.
Pipette calibration can be accomplished manually or automatically in the balance. Calculations
made within the balance provide results of Inaccuracy and Imprecision.
To Establish Pipette Calibration
Refer to paragraph 3.7.5 for Pipette set-up procedures. Enable Pipette Mode in the Menu where
the following parameters can be set (liquid, barometric pressure, etc.).
Press and hold
Mode
button until MODE PIPETTE is shown. Press the
Yes
button, MODE SET
MANUAL is displayed. You can select either AUTO or MANUAL. Use the
No
button to change selec-
tion and
Yes
button to accept.
Press the
Yes
button, TEMP 25.00 c is displayed. Press the
No
button to increment digit edit field
and
Back
button to decrement. Press the
Yes
button to save temperature value of the liquid used
in the pipettes.
B PRESS 1.000 ATM is displayed as an example, if a different pressure unit was initially selected,
you can now edit the value. Press the
Yes
button when finished with editing the value.
NOM 0.000 ML is displayed, the example illustrates ML was selected. You may now enter the Pi-
pette dispensing value. For the purposes of this example, 0.330 ML was used and an Auto Mode
was selected. This allows a faster method of results with limited handling of the balance. Use the
No
,
Back
and
Yes
buttons to edit the value.
Press the
Yes
button, INACC % 0.000000 is displayed. Enter the value shown on the Pipette
specification into the balance using the
No
,
Yes
and
Back
buttons. The example illustrates
5.000000 %, press the
Yes
button.
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Summary of Contents for DV114C
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