Raman ASTM Signal-to-Noise Test
This test verifies the Raman ASTM signal-to-noise for the FLD detectors.
Depending on the version of the detector the specification has changed.
Instrument | SNR Specification Raman / Dark | SNR Specification Dual WL |
|---|---|---|
| G7121A | 500 / 3000 |
|
| G7121B |
500 / 3000 | 300 |
Conditions: Standard flow cell (G1321-60005, G5615-60005), flow of 0.25 mL/min of water.
NOTE
The Dark and Dual WL values are just additional specifications. Only the Raman value is used for the standard instrument checkout.
NOTE
The specification single wavelength at signal can be measured with the Agilent Lab Advisor. All others (not used for standard checkout) have to be set up manually with the information from Settings for Single Wavelength Specifications (at background) and Settings for Dual Wavelength Specifications (Multi-EM Scan).
Duration | approximately 23 minutes |
Standard Flow Cell | G1321-60005, G5615-60005 |
Solvent | LC grade water, degassed |
Flow rate | 0.25 mL/min |
Specification (single wavelength at signal) | >500 (according to settings in Settings for Single Wavelength Specifications (at signal)) |
Specification (single wavelength at background) | >3000 (according to settings in Settings for Single Wavelength Specifications (at background)) |
Specification (dual wavelength) | >300 (according to settings in Settings for Dual Wavelength Specifications (Multi-EM Scan)) |
Time | EX | EM | PMT | Baseline |
|---|---|---|---|---|
|
0 |
350 |
397 |
12 |
Free |
|
20.30 |
350 |
450 |
12 |
Free |
Time | EX | EM | PMT | Baseline |
|---|---|---|---|---|
|
0 |
350 |
450 |
14 |
Free |
|
20.30 |
350 |
397 |
14 |
Free |
Time | EX | EM_A | EM_B | Spectra | From | To | Step | PMT | Baseline | Fit Spectra |
|---|---|---|---|---|---|---|---|---|---|---|
| 00.00 | 350 |
397 | 450 | None |
280 | 450 | 10 |
12 | Free | OFF |
| 20.30 |
350 | 450 | 450 |
None | 280 | 450 |
10 | 12 | Free |
OFF |
Formulas for the Raman ASTM S/N value (see Raman ASTM signal/noise calculation for details):
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