26
6.2.2.4 Using a Factor
The factor menu enables a factor to be entered. This
function is accessed by pressing the key adjacent to
the factor icon. This opens the extended number entry
screen. Use the keys at the bottom of the screen to
select the digit to be changed. The key below the digit
must be pressed twice to select the adjacent digit.
For example 00 the first press of the key alters 10, the second press alters 01. Use the keys adjacent
to the arrow icons to increase or decrease the selected number. Factor values of 0.001 to 10,000 can
be entered. The factor value can be reset to one by pressing the key adjacent to the 001 icon. Once
the factor has been entered press the key adjacent to the tick icon to save and return to the settings
menu. The entered value is displayed in the settings menu adjacent to the factor icon.
If the factor is not known a standard should be measured in order to calculate the factor. If a standard
is used the factor value should be set to 1.000.
6.3
CALIBRATION
In the concentration measurement mode calibrations
against a standard or a factor can be performed
following a zero calibration. If the factor is not known
calibration against a known standard is performed in
order to calculate the factor. However if the factor is
known there is no need to calibrate using a standard.
The calibration must be performed at the same wavelength at which the sample will be measured.
6.3.1
Calibrating to a Standard
Insert a cuvette containing the blank solution into the sample chamber and close the instrument lid.
Press the key below the calibrate to zero absorbance icon. The instrument will calibrate to zero
absorbance. Insert a cuvette containing the standard concentration sample solution into the sample
chamber and close the instrument lid.
Summary of Contents for 7300
Page 1: ...Operating Manual 730 005 REV D 08 14 Model 7300 and 7305 Spectrophotometer...
Page 2: ...2...
Page 56: ...56 SECTION 11 Declaration of Conformity...
Page 57: ...57...
