Adjusting The Photometer Option's Uv Source Lamp; Figure 7-8. Photometer - Location Of Uv Detector Gain Adjustment & Uv Lamp Set Screw - Teledyne T750 User Manual

A
7.6.
DJUSTING THE
This procedure details the steps for adjustment of the UV source lamp in the optical bench
assembly. This procedure should be done whenever the PHOTO REFERENCE value
drops below 3000 mV.
1. Make sure the instrument is warmed-up and has been running in Standby
2. Open the instrument panels.
3. Locate the Photometer.
4. Locate the UV detector gain adjust pot on the photometer assembly (see
5. Navigate to the Utilities>Diagnostics>Analog Inputs menu and select
6. Using an insulated pot adjustment tool, Turn the UV detector gain adjustment
Note
7. Replace the cover on the instrument.
Figure 7-8. Photometer – Location of UV Detector Gain Adjustment & UV Lamp Set Screw
083730750B DCN8606
P O
HOTOMETER PTION
mode for at least 30 minutes before proceeding.
Figure 7-8).
Photo Detector.
pot until the value of Photo Detector is as close as possible to 4600.0 MV.
• Additional adjustment can be made by physically rotating the lamp in its
housing. To do this, slightly loosen the UV lamp setscrew and slowly
rotate the lamp up to ¼ turn in either direction while watching the Photo
Detector signal.
Once the optimum lamp position is determined, re-tighten the lamp
•
setscrew.
If a minimum reading of 3500.0 mV cannot be reached, the
lamp must be replaced.
' UV S L
S OURCE AMP
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