Hach-Lange DR 3900 User Manual - Manual (Page 57)

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Standard programs
5.4.3 Use of program timers
Some procedures do not require the use of timers. Other
procedures require several timers. These timers are
pre-programmed into each Stored Program, along with a
description of the activity to be performed during the timed period.
Table 4 Stored programs options
Options Description
More For further Options
Store Off/On
With the Store On setting, all measurement data is stored automatically. With the Store Off
setting, no measurement data is stored.
% Trans/Conc/Abs To switch to % transmittance, concentration or absorbance readings
Send Data icon /
Send Data To send data to a printer, network drive, computer or USB memory stick (USB type A or Ethernet
port)
Timer icon
This functions as a stopwatch. It helps to make sure that the steps of an analysis are correctly
timed (e. g. reaction times, wait times, etc., can be exactly specified). When the specified time has
elapsed, a sound is emitted. The use of the timer has no influence on the reading program.
Dilution Factor Off/On
A corrective dilution factor can be entered in order to take account of certain properties.
The number entered at the dilution factor prompt will be multiplied by the result to compensate for
the adjustment. For example, if the sample has been diluted by a factor of 2, enter 2. The default
setting of the dilution factor is turned off.
Note: When a dilution is in effect, the dilution icon will appear on the display.
Standard Addition
This option enables the accuracy of the measurements to be checked. The procedural instructions
for test parameters contain a detailed explanation of how to use this function.
Standard Adjust
The procedural instructions for test parameters indicate whether a standard adjustment is
necessary and, if so, how to proceed.
Chemical Form Some of the stored tests/methods allow selection of the chemical form and measuring range.
Reagent Blank
Some of the stored tests/methods include the "Reagent Blank" function. This enables the reagent
blank value to be added to or subtracted from, the subsequent readings. The reagent blank value
shifts the calibration curve along the y-axis, without changing the shape or gradient of the curve.
The effect corresponds to a y-axis intercept of the calibration straight line. This is clarified by the
following formula: concentration =[conc. factor) x Abs] - (reagent blank)
Save as User Program To store the selected parameters as a User Program, refer to section 6.1, page 73 .
Multiple determination This option allows the multiple determination of a sample.
Recall Data To recall saved measurement data or time courses, refer to section 5.3, page 43 .
Instrument Setup
mode
Basic data for the instrument, refer to section 5.2, page 27 .