Thermo 335904, Operator'S Manual, Page: 48 / 94

position to measure the blank. When it
completes the measurement, it returns to its
previous cell position.
4. Press Measure Sample to start the measurement.
If your instrument is equipped with a 6-Position
Cell Holder, press the cell position buttons on
the keypad to re-position the cell holder and
measure the rest of the unknowns manually.
Absorbance Difference
When you use the Absorbance Difference program,
you can perform these tasks:
•
Recall a test OR set up your test parameters
• Run the Cell Correction program
• Measure a blank
• Measure unknowns
To get started, press the TEST key on the keypad.
When the Test Types screen appears, highlight
Absorbance Difference and press ENTER .
Recalling a test
1.
With the Absorbance Difference screen
displayed, press Stored Tests . A list of stored
tests appears.
2. Use the arrow keys to highlight the name of
the test you want to recall and press
ENTER .
The parameters for the selected test appear on
the screen.
From this screen, you can:
•
Set up test parameters
• Set up Cell Correction program
• Save a test
• View the list of stored tests
• Measure a blank
• Measure unknowns
Setting up test parameters
1.
With the Absorbance Difference screen
displayed, use the arrow keys to highlight the
name of the parameter you want to set.
2. When the parameters are set, you can press
Save Test to save the test or Run Test to
measure a blank or unknowns.
Measuring unknowns
Measuring unknowns automatically (using Auto 6
or Auto 3)
1. With the Absorbance Difference screen
displayed, press Run Test .
2. Place the blank and unknowns in the correct
cell positions.
3. Press ENTER to start the measurement. The
instrument automatically measures the blank
first, then measures the unknowns and
displays the sample measurements on the
screen.
Measuring unknowns manually (using Manual 6 or
Single Cell Platform)
1. With the Absorbance Difference screen
displayed, press Run Test .
2. Place the blank and unknown in the correct cell
position. If your instrument is equipped with a
6-Position Cell Holder, you can place up to five
samples in the cell holder.
3. Press Measure Blank to measure the blank. If
your instrument is equipped with a 6-Position
Cell Holder, it automatically moves to the B
Using “General Tests” Software
Thermo Electron Corporation 3-16