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SECTION 3, continued
3.2 Using the Read Key
To preserve battery power and prolong lamp life, the lamp turns on only
after the
READ key is pressed. Pressing the key turns the instrument
lamp on; after about 12 seconds, the lamp turns off, but the
measurement value continues to be displayed. After the first
measurement, a four-second recovery time occurs before another
measurement can be started. If
READ is pressed during the recovery
time, the display will begin flashing, but the lamp will not turn on until
the full four seconds have passed. If no other key strokes occur within
5.5 minutes, the instrument turns off.
3.2.1 Continuous Reading
The instrument cannot be used in continuous read mode if the Signal
Averaging mode is on.
The instrument will perform continuous readings if the
READ key is
pressed and held. As long as the key is held, the lamp remains on and
the display is updated every 1.2 seconds.
3.3 Using the Signal Averaging Key
The signal averaging mode compensates for reading fluctuations caused
by drifting of sample particles through the light path. Signal averaging
is turned on or off by pressing the
SIGNAL AVERAGE key. The SIG AVG
icon is displayed when signal averaging is on.
Signal averaging measures and averages ten measurements while
displaying intermediate results. The initial value is displayed after about
SIGNAL
AV E R A G E
Indicates the signal averaging mode is on. The icon turns off if
signal averaging is not selected.
AUTO RNG Indicates instrument is in automatic range mode. The icon
turns off when manual range mode is selected.
8888 The 4-digit display is active when the instrument is on
(measurements are displayed to three digits). After the READ
key is pressed
- - - - is displayed during wait periods.
NTU Identifies the measurement units- Nephelometric Turbidity
Units. This icon is active during measurements and in the
calibration mode.
Display Icon Description
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