Hanna Instruments HI 250 - Manual (Page 24)

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RELATIVE mV CALIBRATION (HI 251)
Note: • If the reading is not close to the selected calibration point,
“WRONG” tag will blink. Verify calibration condition or contact
your vendor if you can not calibrate.
• Press CAL in any moment of the calibration process. The instruments
will return to measurement mode. If calibration process is stopped
after 600 mV is confirmed, the 600 mV range is calibrated and
calibration parameters are memorized.
• 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 absolute reading is stable and in measurement range, the
instrument asks for confirmation.
• If the reading is out of range, “WRONG” tag will be displayed.
• Press CFM to confirm the absolute value. The instrument will display 0.0
mV on the primary LCD and “rEL” message on the secondary LCD. In this
moment the relative mV offset is equal to absolute mV reading.
• Use the ARROW keys if you want to change the displayed relative mV value.
• Press CFM to confirm the relative mV value. The relative mV offset is
displayed on the primary LCD and “OFF” message on the secondary LCD for
a few seconds. The instrument returns to measurement mode.
Note: The relative mV value can be changed only inside the relative mV offset
window (± 2000 mV).