Unico SQ Series - Check Stray Light; Check Absorbance Accuracy

Maintenance
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1. Prepare (Refer 7.6.1).
2. Press 3 to select “WL Scan”, press “F1” to setup, set the parameter as
follow, press “Enter” to finished setup.
Scan from: 400
Scan to: 300
Scan Step: 0.1
Scan Speed: HI
3. Ensure beam is clear. Press “0Abs” to scan blank.
4. Insert holmium filter. Press “Start”.
5. When scan complete, press “F3”: Search, Press “▼”, record wavelength
of holmium peak (specification: 360.9 ±1nm).
6. Press “ESC”, press “F1” to setup, set the parameter as follow, press
“Enter” to finished setup.
Scan from: 850
Scan to: 750
Scan Step: 0.1
Scan Speed: HI
7. Ensure beam is clear. Press “0Abs” to scan blank.
8. Insert didymium filter. Press “Start”.
9. When scan complete, press “F3”: Search, Press “▼”, record wavelength
of didymium peak (specification: 807.1 ±1nm).
7.6.3 Check Stray Light
1. Prepare (Refer 7.6.1).
2. Press “Setλ”, input 340, press “Enter” to go to 340nm.
3. Ensure beam is clear. Press 1 to “Basic Mode” and automatic blanking.
4. Insert GG375 filter.
5. Record stray light at 340nm (specification >3A, <0.1%T).
6. Remove filter.
7. Press “Setλ”, input 220, press “Enter” to go to 220nm.
8. Insert WG295 filter.
9. Record stray light at 220nm (specification >3A, <0.1%T).
7.6.4 Check Absorbance Accuracy
1. Prepare (Refer 7.6.1).
2. Fit neutral density filters, blank, 0.5A, 1A, 2A in cell changer and move
blank into beam
3. Press “Setλ”, input 546, press “Enter” to go to 546nm.
4. Push filters into beam and record values. Compare the results with the
calibrated absorbance (specification <±1%A, so <±0.005A at 0.5A,
<±0.010A at 1A, <±0.020A at 2A).