Start-Up - Hanna Instruments HI 22 Series Instruction Manual

• Press or
at the time of last calibration. The secondary display will
show "BUF2" to indicate second buffer.
• Press or
the time of last calibration. The secondary display will show
"BUF3" to indicate third buffer.
• Press or
(date) at the time of last calibration.
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again to view the second memorized buffer
again to view the third memorized buffer at
again to return to the first CAL DATA display

START-UP

At start-up the firmware release code scrolls through the LCD;
it is possible to escape from code scrolling pressing any key.
During the automatic start-up the Real Time Clock (RTC) is
checked to see if a reset occurred since last software ini-
tialization. In this case, the RTC is initialized with the default
date and time 01/01/1997 - 00:00. An EEPROM reset
does not affect the RTC settings.
The EEPROM is also checked to see if it is new. If this is the
case, the default values are copied from ROM and then
the device enters normal mode. Otherwise an EEPROM
checksum test is performed (the same is performed during
EEPROM selftest procedure).
If checksum is correct, normal mode is entered, otherwise
user is asked whether the EEPROM should be reset.
If EEPROM reset is requested, default values from ROM
are stored into EEPROM as would happen with a new
EEPROM.
Note that EEPROM data is composed of setup data and
calibration data. As for the setup data, the calibration data is
assigned default values when an EEPROM reset occurs. An
un-calibrated meter can perform mea-
surement, though user is informed that
pH calibration (pH models) or mV cali-
bration (mV models) is needed by
means a blinking "CAL" icon.
When the last calibration data is re-
quired, the "no CAL" message is
displayed if no calibration procedure
was performed.
Unlike pH and mV calibration, user has no information on
calibration need for other magnitudes, other than the aware-
ness that EEPROM was reset.
After an EEPROM reset, all calibrations (input and output)
have to be performed in order to obtain correct measure-
ments.
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