User`s manual

XP8000 Series (PLCBus

)

Z-World 530-757-3737 7

EEPROM Coefficients

Compensation coefficients, determined by precise measure-

ment, are stored in the on-board EEPROM for each of the 18

software A/D modes.

Measurement of Ambient Temperature

The TEMP pin on U1 (LT10 19 ) puts out a voltage that is directly

proportional to absolute temperature, with a slope of 2.1 mV

per degree. Room temperature (295°K) generates ~620 mV.

Excitation Voltage at Each Input

To provide an excitation voltage at each input channel on head-

ers H1 and H2, install RN2 and RN3 on the board and connect

EX1 (on H1) and EX4 (on H2) to V+ on header H5.

The ADC4

Z-World’s ADC4 expansion board adds eleven 12-bit ADC chan-

nels to your system. Four channels have signal conditioning

that can match your input voltage range. The ADC4 board nor-

mally operates at 24V, but will operate at 12V.

J1, J2

Regulator

PAL

C11

J4, J5

RP4 RP3

Gain and

Bias

The four channels (CH0–CH3) that have signal-conditioning

circuitry, as shown below. You can match the voltage range of

the device you are measuring to the fixed voltage range (2.5V)

of the ADC chip by changing socketed resistors (labelled GAIN

and BIAS here).

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