Hach-Lange DR 3900 User Manual - Manual (Page 84)

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Expanded programs
6.1.2.1 Measurement process
The measurement process defines the handling and the readings
of the test:
• At which and how many wavelengths should readings be
completed
• How many absorbance readings must be completed?
• When should the zero reading and the sample reading be
completed?
• Are waiting times necessary between readings?
• Should individual program sequences be repeated?
The elements of a measuring sequence, such as zero and
sample readings and the timer(s) (reaction times, waiting times,
etc.) are individually defined.
6.1.2.2 Enter a new element of a measuring sequence
Note: Each component of the measurement process must be entered in
the order in which it will be completed.
1. Mark the Measurement process row in the data overview.
2. Press Edit.
3. Press Edit.
4. Press New.
Table 10 Definitions of the program points
Program point Description
Name Name of the analysis parameter
Version An abbreviation or version number assigned by the user is entered here.
Measurement process
Exact definition of the test: the number of wavelengths at which readings are carried out, the
number of absorbance readings needed, the keys to be used, any waiting periods between
readings, etc.
Formula Definition of the formulas with which the test result is calculated.
Variables
The number of variables shown in the display depends on the definition of the measurement
process and the formulas. Input of the numerical values of the wavelengths, factors, constants,
etc.
Timer 1, Timer 2,
Timer 3, Timer 4
This function can be used to enter abbreviations and defined times for up to four timers.
Highlight the corresponding line and press Edit. The timers are activated or deactivated with the
control boxes on the left of the display. In the next column, a selection can be made from a list of
names that describe the corresponding work step. In the third column, the times for each active
timer are entered.