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Teledyne API Model 401 O
3
Photometric Calibrator Instruction Manual, 01124, Rev. J2
8 ADJUSTMENTS
NOTE
The operations outlined in this chapter are to be
performed by qualified maintenance personnel only.
All adjustments to the Model 401 are easy to make. Pots and test points are readily accessible
without removing any components.
Figure 1-7 is a plan view of the Model 401 Photometric Calibrator showing all the major
components.
Figure 8-1 is an electrical diagram of Model 401 Photometric Calibrator.
8.1 Power Supply Board Adjustment
The power supply board provides ± 15 v + 12 v and + 5 v DC power to the Calibrator. Four
temperature linearization circuits, for the Calibrator main lamp, Sample temp, Box temp, and
IZS ozone generator are also located on the power supply board.
Each circuit is a whetstone bridge with the measuring thermistor being one leg. A feedback
circuit performs the required linearization. Zero adjust pots have been factory set and no field
adjustment should be required.
NOTE
The power supply board also contains a "Brown-Out" detector.
8.1.1 Box Temperature Limits
The box temperature is measured by a thermistor located on the motherboard. The box
temperature is not controlled in the Model 401. The temperature is measured and displayed as a
TEST function on the front panel (see Section 5.1). The alarm limits can be set via an RS-232
port command.
8-1