Hanna Instruments HI 255 - Manual (Page 15)

15
RELATIVE mV CALIBRATION
• Press CAL when the instrument is in RELATIVE mV measurement mode.
The “mV” and “ ” tags will blink. Absolute mV is displayed on the
primary LCD and “AbS” message is displayed on the secondary LCD.
• When the reading is stable and inside the offset window (±2000 mV), the
instrument asks for confirmation.
• If the reading is out of the offset window, “WRONG” tag will be displayed.
• Press CFM to confirm absolute value. The instrument will display 0.0 mV
on the primary LCD and “rEL” message on the secondary LCD line. In this
moment the relative mV offset is equal to absolute mV reading.
• Use the ARROW keys if you want to change the displayed value.
• Press CFM to confirm relative mV calibration. The instrument will return to
measurement mode.