Hach-Lange DR 3900 User Manual - Manual (Page 66)

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Standard programs
Table 5 Barcode program options
Options Description
More For further Options
Store Off/On
Store: On stores all measurement data automatically
Store: Off does not store any measurement data.
Abs % Trans To switch to % transmittance or absorbance readings
Send Data icon /
Send Data
To send data to a printer, computer or USB memory stick (USB A) or network.
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.
Note: If undiluted samples are used, set the dilution factor off.
Chemical Form Some of the stored tests/methods allow selection of the chemical form and measuring range.
Reagent Blank
The function "Reagent Blank" is available for several barcode tests. 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) * Abs] - (reagent blank)
Edit To modify an existing program
Lot information All relevant manufacturing data is stored here.
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 measurement
data
Recall saved measurement data, wave-length scans or time courses, see section 5.3, page 43 .
Instrument Setup mode For basic instrument data, refer to section 5.2, page 27 .