6-40 | Model 933S UV Analyzer
Source Lamp Alignment
If the Measure or Reference PMT voltage reaches 10000 mV at any time
during the alignment manipulations (while rotating a lamp), decrease the
PMT Level, allow the analyzer to stabilize for approximately 10 minutes,
and perform an Auto-Setup to reset the PMT signals before continuing.
To align the source lamps:
1. From the Optical Bench dialog box, ensure the ALC On check box is
disabled (not checked). Click OK.
2. Loosen – but do not remove – the (2) M3 x 8 screws on the Optical
Bench Microcontroller mounting bracket and swing the Microcon-
troller/Micro-Interface board assembly outward.
3. Slightly loosen the Lamp Clamping and Lamp Retaining screws (Fig-
ure 6-2).
4. View the 93XS Configurator window to observe the voltage signal
from the Measure PMT for each filter. To do this, open the Configurator
file “M933S.dyc” (Figure 6-9) to display two Trend graphs.
While viewing the signals on the 93XS Configurator window, slowly
rotate the new lamp(s) to obtain the maximum voltage signal from the
Measure PMT.
Cadmium lamps: Filters 1, 3, and 5 – Lamp 1
Copper lamps: Filters 2 and 6 – Lamp 2
Since the software is updated at one-second intervals use slow, small
movements, pausing each turn to view the new value.
Because the Automatic Lamp Control is turned off (ALC On = un-
checked), the signals may not be completely steady.
5. Loosen the Lamp Locking Screw.
6. To obtain the maximum signal from the Measure PMT voltage, adjust
the Lamp Adjusting Screw for the lamp that is being adjusted.
7. If the other lamp was also replaced, repeat Steps 4–6.
8. Tighten the Lamp Locking Screw.
9. Tighten the Lamp Clamping Screw to secure the lamps. Do not over-
tighten; the spring should not be collapsed.
NOTE
FileOpen
Conguration
<<M933S.dyc>>
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