Adjustments; Power Supply Board Adjustment; Box Temperature Limits - Teledyne 401 Instruction Manual

O3 calibrator

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Teledyne API Model 401 O

8 ADJUSTMENTS

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.

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.

The power supply board also contains a "Brown-Out" detector.

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.

Photometric Calibrator Instruction Manual, 01124, Rev. J1

NOTE

8-1

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