Shimadzu SPD-M20A - Page 63

Chapter 6: Maintenance and Adjustments
SPD-M20A Service Manual
61
5) Install the absorbance accuracy measurement cell according to the directions in
the dialog box. At this time, do not install the standard filter.
6) When <Measure> appears, install the standard filter, wait about 30 seconds for
the spectrum to stabilize, and proceed to the next step.
7) When <Result> is displayed, record the results.
Judgment
Filter absorbance: (A) ..... Written on the standard filter certificate, the
standard absorbance at the standard wavelength
245 nm
Measurement value: (B) ..... Absorbance at standard wavelength 245 nm
Standard value: 3 [%]
Accuracy:  = (B/ A 1) 100 [%]
Judgment: Satisfies expression  < 3 [%]
Example
Standard wavelength of standard filter 245 nm
Standard absorbance of standard filter 0.50 AU .................... A
Measurement value with standard filter 0.51 AU@245 nm .... B
Error  = (0.51/ 0.50 1) 100
= 2 [%] < 3% OK
Slit Width [nm]
Standard
Wavelength
[nm]
Standard
Absorbance
[ABS]
Measurement
Value [ABS]
Accuracy
[%]
Criteria
[%]
Judgment
1.2
245
< 3
8
245
< 3