Hofmann PMH-2, Руководство пользователя

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Offset calibrations can be performed if the electrode signal is between
pH 6.00 and 8.00 or -50 and +250mVA mV. The message ‘ Err ‘ indicates
if pH / mV is out of range. If this is the case ‘PUSH’ twice, adjust pH / mV
for correct value and repeat offset calibration.
A slope calibration can be performed if the pH is lower than 5.5. or higher
than 8.5 or in mV mode between 280mV and 900mV. The message
‘ Err ‘
will show if this condition is not met. If this is the case PUSH twice, adjust
pH / mV for correct value and repeat mV calibration.
PAGE 18 PMH-2 Instruction manual