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Calibration Procedure:

1. Attach the 0-1 VDC signal source to the Senor Input Jack on the

‘Switch PC Board’, pins 1&4. Pin 1 = Humidity, Pin 4 =

Temperature, Pin 2 = Ground.

2. Set the signal source to 0.000 VDC (ground).

3. Using the Meter, measure at the sensor inputs on each of the

microprocessor controllers, positions 1 (+) and 2(-).

4. Measuring at the RH Microprocessor, adjust R3 for a reading of

0.000mVDC.

5. Measuring at the Temperature Microprocessor, adjust R1 for a

reading of 0.000mVDC.

6. Set the signal source to 1.000 VDC.

7. Measuring at the RH Microprocessor, adjust R4 for a reading of

50.000mVDC.

8. Measuring at the Temperature Microprocessor, adjust R2 for a

reading of 50.000 mVDC.

9. Check the actual RH Microprocessor display to verify it shows

0-100% RH for and input of 0-1VDC at the sensor jack (pin1).

Adjust R3 & R4 if necessary.

10. Check the actual Temperature microprocessor display to verify

it shows 0-100°C (32-212°F) for an input of 0-1VDC at the

sensor jack (pin4). Adjust R1 & R2 if necessary.

1.1.2 Side Interface Panel Description

All user connections to the Chamber are made through the Side Interface Panel

shown in Figure 1.0-2. Power connections, Operating Systems connections and

the Computer interface are all on this panel. The Side Interface Panel is a

modular layout that is configured to meet the specifications of the Operating

Systems ordered with the Model 518. Tube fittings may be added/removed and

power outlets may be added/removed. The following sections will describe the

main features of the Side Interface Panel in the standard Model 518

configuration. For other configurations, specific installation instructions will be

included.

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Directed Electronics 554A Specifiche Pagina 6