18.ANALOG CIRCUIT CALIBRATION

Calibration applies only to boards with the analog I/O circuit.

The analog I/O circuit is calibrated during production test prior to shipment. Over time the circuit may drift slightly. If calibration is desired follow the procedure below. For analog I/O circuit configuration see page 45.

Four adjustments are possible:

A/D bipolar offset

A/D unipolar offset

A/D full-scale

D/A full-scale

No adjustment for D/A offset is possible.

18.1 A/D bipolar offset

Potentiometer R66 is used for adjustment. Configure the circuit for Bipolar A/D mode. Input 0V to any input channel and perform A/D conversions on that channel. The gain setting and single- ended vs. differential mode do not matter. Adjust R66 until the A/D value is 0. To eliminate the effects of noise, it is best to take a number of readings and average the values.

18.2 A/D unipolar offset

Potentiometer R67 is used for adjustment. Configure the circuit for Unipolar A/D mode. The gain setting and single-ended vs. differential mode do not matter. Input 0V to any input channel and perform A/D conversions on that channel. Adjust R67 until the A/D value is 0~1. To eliminate the effects of noise, it is best to take a number of readings and average the values.

18.3 A/D full-scale

Potentiometer R74 is used for adjustment. Configure the circuit for Bipolar A/D mode ±10V. Input 9.9945V to any input channel and perform A/D conversions on that channel using a gain setting of 1. Single-ended vs. differential mode does not matter. Adjust R74 until the average A/D value is 32750. To eliminate the effects of noise, it is best to take a number of readings and average the values.

Any input voltage and A/D reading near the top of the range (10V) can be used for the calibration target voltage/reading. The above value is provided as an example.

18.4 D/A full scale

Potentiometer R89 is used for adjustment. Configure the D/A for 0-10V output range. Write the output code of 4095 to all four D/A channels. Measure each one and adjust R89 until the average reading is as close to 9.9976 as possible.

Prometheus CPU User Manual V1.44

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Diamond Systems PR-Z32-E-ST, PR-Z32-EA-ST Analog Circuit Calibration, 18.1 A/D bipolar offset, 18.2 A/D unipolar offset

PR-Z32-E-ST, PR-Z32-EA-ST specifications

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