Teledyne 200AH 用户手册

 

The Status/Temp Board is a multifunction board that: 

1.  Converts the resistance readings of the thermistors to a voltage. 

2.  Amplifies and scales the thermocouple voltage for the V/F card. 

3.  Provides status output circuitry. 

4.  Provides circuitry for contact closure inputs. 

5.  Provides circuitry for display brown-out/reset at low line voltage. 

6.  Provides circuitry for 4-20 mA outputs. 

The 4 thermistor amplifiers that convert resistance into voltage monitor: 

1.  Reaction Cell temperature. 

2.  Heated Orifice block. 

3.  Box temperature. 

4.  Spare. 

The voltages of the thermistor and thermocouple amplifier outputs are brought out to test points 
on the edge of the board. Refer to the schematic in the Appendix for details. The voltages can 
also be read using the DIAGNOSTIC - SIGNAL I/O feature. See Table 9-4 for details. 

The 4 temperature amplifiers are controlled by a common pot (R34) on the upper edge of the 
card. 

If the temperature readouts are in error: 

1.  Locate the Box temp thermistor on the board and place a thermometer near the thermistor. 

2.  Select the BOX TEMP - TEST function on the front panel. 

3.  Adjust R34 until the front panel readout matches the thermometer readout. This will cause all 

of the readouts to accurately measure their respective temperatures. 

The converter temperature is sensed by a Type K thermocouple. The cold junction compensation 
and signal conditioning are done on the Temp/Status board.