Hanna Instruments HI 710 Series Instruction Manual page 24

scrolling "Display test" message.
The segments are lit for a few seconds and then switched off
before exiting the selftest procedure.
KEYBOARD SELFTEST
The keyboard selftest procedure begins with the message "But-
ton test, press LCD, CAL and SETUP together to escape". The
LCD will then show only a colon.
As soon as one or more keys are pressed, the appropriate
segments out of 88:88 corresponding to the pressed keys,
will light up on the screen.
For example, if CFM and CAL DATA are pressed together the
LCD will look like this:
The colon is a useful indicator for the correct position of
squares.
Note
A maximum of two keys may be pressed simultaneously to be
properly recognized.
To exit the keyboard test
procedure press LCD, CAL
and SETUP simultaneously.
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EEPROM SELFTEST
The EEPROM selftest procedure involves verifying the stored
EEPROM checksum. If the checksum is correct the "Stored
data good" message will be shown for a few seconds before
exiting selftest procedure.
If not, the message "Stored data error - Press
stored data or
If is pressed the EEPROM selftest procedure terminates
with no other action. Otherwise, EEPROM is reset with de-
fault values from ROM as when a device with a virgin
EEPROM is switched on.
During EEPROM reset a blinking mes-
sage "Set" is shown on primary LCD;
the secondary LCD displays "MEM".
At the end of this operation all the pa-
rameters are reset to their default
values. The calibrated cell constant is
also reset. For this reason the "CAL"
flag blinks until the EC/TDS calibra-
tion is performed.
RELAYS AND LEDS
Relays and LEDs selftests are executed as follows:
First all of the relays and LEDs are switched off, then they are
switched on one at a time for a few seconds and cyclically.
User can interrupt the otherwise endless cycle pressing any
key, as indicated by the scrolling message.
Note
Relays and LEDs test has to be carried out with the relay
contacts disconnected from external plant devices.
to reset
to ignore".
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