Specifications

6
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.