2 signal averaging – Hach-Lange 2100P iso - Portable Turbidimeter Instrument User Manual

Page 18

Advertising
background image

Page 18
Signal Averaging

4650098 operation.fm

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

Scrolls between Auto Range, Manual Range, 0.00–9.99 FNU range, 10–99.9 FNU range,
and 100–1000 FNU range. The range selection cannot be changed when a reading or cali-
bration is in progress.
When the meter is turned on it defaults to the last used range mode and measurement
range.

Key

Description

DIAG

Turns on after DIAG is pressed. A number displayed under the DIAG icon (1–9) indicates
which diagnostic function is active.

CAL

Turns on after CAL is pressed and remains on during the calibration.

CAL?

Appears after calibration if a value entered during calibration is outside an acceptable
range. May indicate an operator error or possible instrument malfunction. Flashing CAL?
indicates the default calibration coefficients are being used (even after a user-calibration
has been done) or that no calibration data is currently stored.

S__

Appears during calibration. The S is followed by a number to indicate which standard
value is currently being edited or displayed. The flashing number is prompting user for
measurement of S0, S1, S2 or S3 to establish a calibration. Steady number identifies
which standard value is being displayed.
Flashes when the battery voltage drops to 4.4 volts indicating to change batteries. At <4.0
volts, the instrument automatically shuts off.
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.

SIG AVG

Indicates the signal averaging mode is on. The icon turns off if signal averaging is not sel-
ected.

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.

Key

Description

Advertising