Teledyne 200A, Instruction Manual, Page: 189 / 220

Teledyne API Model 200A NO
X
Analyzer Instruction Manual, 02246, Rev. F1
9.3.3.2
Several different output voltage ranges can be selected by switchs on the V/F board. See Figure
9-4 for the switch settings.
9.3.4 Status/Temp Board
The Status/Temp Board is a multifunction board that:
1. Converts the resistance readings of the thermistors to voltages
2. Conditions 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 chip carriers for voltage-to-current modules
9.3.4.1 Temperature Amplifier Section
The Status/Temp board (01086) is a multifunction board consisting of 4 thermistor amplifiers
that monitor:
1. IZS temperature
2. Reaction Cell temperature
3. Box temperature
4. Spare
All 4 amplifiers have a single gain control - R34. If necessary, you can adjust the temperature
values by selecting the BOX TEMP - TEST function and adjusting R34 until the correct box
temp is shown. Remember that the temperature inside the case runs several degrees higher than
room temperature, which should be taken into account when setting BOX TEMP.
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 01086 for details. The voltages can also be read
using the DIAGNOSTIC - SIGNAL I/O feature. See Table 9-4 for details.
Changing Output Voltage Ranges
9-47