Hach DR/2010 - Zeroing the Spectrophotometer; Measuring Prepared Samples

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3.3.3 Zeroing the Spectrophotometer
The instrument must be zeroed for each test or series of tests to establish a
zero reference for the measurement. This is done by placing a zero
solution (as described in the test procedure) in the cell holder and pressing
ZERO. The display will show:
and the next prompt will indicate the instrument is ready for the first sample:
Note: Once the zero reference point has been established, several samples can
be measured consecutively by placing them into the cell holder and closing the
light shield. If in the Momentary mode, you must press the
READ key for each
measurement. The instrument can be re-zeroed at any time by placing the zero
solution (blank) into the instrument and pressing the ZERO key.
3.3.4 Measuring Prepared Samples
In the Constant-On mode, just place the prepared sample into the cell
compartment (with the 10 or 25-mL mark to the left as shown in Figure
12) and close the light shield. The test result is displayed immediately and
continuously updated. In the Momentary mode, however, you must press
the
READ key when ready to take the reading; the result is not continuously
updated as it is in Constant-On mode.
The display shows:
In about 6 seconds, the test result appears; for example:
nm
+8.8.:8.8. ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
888590
* Zeroinç...
nm
+8.8.:8.8. ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
888590
*0.00 mç/L Fe TPTZ AV
nm
+8.8.:8.8. ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
888590
* Readinç...
nm
+8.8.:8.8. ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
888590
*0.30 mç/L Fe TPTZ AV