Teledyne 200A User Manual download pdf (Page 194)

Teledyne API Model 200A NO

Analyzer Instruction Manual, 02246, Rev. G, DCN 5247

9.3.3.2 Changing Output Voltage Ranges

Several different output voltage ranges can be selected by switchs on the V/F board. See Table

9-9-12 for the switch settings.

9.3.4 Status/Temp Board

The Status/Temp Board is a multifunction board that:

Converts the resistance readings of the thermistors to voltages

Conditions the thermocouple voltage for the V/F card

Provides status output circuitry

Provides circuitry for contact closure inputs

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

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:

IZS temperature

Reaction Cell temperature

Box temperature

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 9-9-4 for details.

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Teledyne 200A User Manual Page 194