Noise Level - Hitachi U-2910 Instruction Manual

4.2 Performance Check

4.2.4 Noise Level

[Summary]
To determine a variation range of absorbance values measured
within a short time under a predetermined measurement conditions
with no sample in the sample compartment.
[Procedure]
1. Choose [Edit] - [Condition setting], then, set the conditions as
follows:
‹General tab›
 Measurement mode
 Apply sample table
‹Instruemnt tab›
 Data mode
 Measuring wavelength (nm)
 Measuring time (s)
 Response
 Baseline correction
 Initial waiting time (s)
 AutoZero before measuring
 Light source switching
 Switching wavelength (nm)
 Cell length (mm)
‹Monitor tab›
 Horizontal axis maximum
 Vertical axis minimum
 Open data processing window
after measurement
 Open data processing window
after measurement with
spectrum superimposed
 Automatic printing
on measuring end
 Display spectrum on the screen
with superimposed
*1: On-choice setting is available. This setting does not
affect measuring.
2. Choose [Edit] - [Sample name/Comment]. Enter, as the
sample name, "Noise level"; then, enter the file name.
3. Click the measuring button (
4. On completion of measurement, print the spectrum. If
needed, click the auto-scale button (
with the scale changed. Calculate difference between the
maximum and minimum (peak-to-peak) of the measured
photometrical values; then, divide the calculation by two
(multiply by 1/2).
4 - 10
Time scan
OFF
Abs
500
300
Medium
User 1 (*1)
0
ON
Automatic
340.0
10
300
0
ON
OFF
OFF
OFF
). (Measurement starts)
) before printing to print