Hanna Instruments HI 83749 - Manual (Page 17)

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AVG (SIGNAL AVERAGE MODE)
It is recommanded to select this measurement mode when you work with unstable samples that
contain suspended particles of different dimensions.
In the AVG mode the instrument takes 20 measurements in a short period of time and displays the
updated averaged value.
• To select the averaged measurement mode press
the AVG key and the AVG icon will appear on
the LCD.
Note: to return to the normal measurement mode
just press again the AVG key.
• Press READ and “----” will blink on the dis-
play. After a few seconds the instrument displays
the first reading. The meter continues updating
the readings until the “Lamp and Read Status”
indicator turns off. The final displayed value is
the averaged reading of turbidity in NTU.
CONTINUOUS MEASUREMENT
This measurement mode can be used to verify how fast suspended parts settle out. Please verify first
that the AVG mode is turned off (see instructions above). To make continuous measurement keep the
READ key pressed until the desired number of measurements are taken.
The last value remains on the display after the READ key is released.
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LOGGING
The log function is active after a valid measurement
is obtained (no errors).
• To log a value, press LOG/CFM when the
measurement result is displayed.
The instrument asks to READ TAG for identification
of the sampling location. The location for the new
record is also displayed on the secondary LCD.
• To read the ID code for the sampling location
identification, simply touch the iButton ® tag with
the matching connector, located on the back of the
instrument (see Connectors Description, page 9).
Alternatively, press again LOG/CFM to store the
record without the tag ID code.
• If the tag is successfully read, the instrument will
beep once, displaying the unique hexadecimal
code of the tag, and store the data.
After data is stored, the instrument returns to
measurement mode.
Notes: • If the tag is not read within 20 seconds,
the logging procedure is canceled.
• A measurement can be stored only once.
Also an over range value can be stored.
• If less than ten free records are available, the
“LOG” tag will blink while storing data.
• If the log memory is full, the “LoG FULL” message
will appear for a few seconds on the LCD and the
instrument will return to measurement mode
without storing the new record.
To store a new record, delete one or more records.
HI 83749 has a log space for up to 200 records. With each measurement, the date, time and tag ID
is stored. In this way, each record is fully characterized and can be easily analyzed when downloading
data on the PC application (HI 92000).
or
or
LOGGING