21
SECTION 2, continued
2.2 Signal Averaging
Signal averaging measures and averages ten measurements while
displaying intermediate results. The initial value is displayed after about
11 seconds and the display is updated every 1.2 seconds until all ten
measurements are taken (about 22 seconds). Afterwards, the lamp turns
off, but the final measured turbidity value continues to be displayed
until another key is pressed.
When signal averaging is off, the instrument takes three measurements,
the microprocessor averages them, then displays the average. If the
READ key is held during measurement, the initial value is displayed
in 12 seconds and is updated every 1.2 seconds as long as the
READ
key is held.
When the instrument is turned on, the instrument defaults to the signal
averaging mode which was used during the last measurement.
2.3 Restoring the Default Calibration
To restore and use the default calibration, turn the instrument off.
Press and hold
DIAG, then press and release I/O. Release DIAG when the
software version number disappears from the display. (For models with
serial number less than 920300000800,
2100 disappears). This clears
any user-entered calibration from memory; the 2100P ISO will use the
default calibration for measurement.
CAL? will appear and continue to
flash until a user-entered calibration is successfully completed.
Appears constantly when the lamp is on and flashes after a reading if
a marginal light level reaches the transmitted light detector. When
flashing, it indicates the sample may be too turbid (not within
measurement range) and needs dilution or the lamp needs replacing.
SIGNAL
AVERAGE
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.
Display Icon Description
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