Measurement-computing PCI-DAS1002 Bedienungsanleitung PDF herunterladen (Seite 20)

PCI-DAS1002 User's Manual Specifications

Analog output

Table 6. Analog output specifications

D/A converter type

AD7847AR or equivalent

Resolution

12 bits

Number of channels

Configuration

Voltage output, single-ended

Output range

±10 V, ±5 V, 0 to 10 V, or 0 to 5 V. Software selectable. Each channel independently

programmable.

D/A pacing

Software

Data transfer

Programmed I/O

Monotonicity

Guaranteed monotonic over temperature

Overall analog output drift

±0.03 LSB/°C max

Settling time

4 µs to 0.01% of 10 V step

Slew rate

7 V/µs min

Current drive

±5 mA min

Output short-circuit duration

Indefinite @25 mA

Output coupling

Output impedance

0.1 Ohm, max

Miscellaneous

Double buffered output latches

Output voltage on power up and reset: ±200 mV

Absolute accuracy

Table 7. Absolute accuracy specifications (analog output)

All ranges

±3 LSB

Calibrated accuracy components

Table 8. Calibrated accuracy specifications (analog output)

Gain error

±1.0 LSB max

Offset error

±0.5LSB max

Integral linearity error

±1.0 LSB max

Differential linearity error

±1.0 LSB max

Each PCI-DAS1002 is tested at the factory to assure absolute accuracy.

Total analog output error is a combination of gain, offset, integral linearity and differential linearity error. The

theoretical worst-case error of the board may be calculated by summing these component errors. Worst case

error is realized only in the unlikely event that each of the component errors are at their maximum level, and

causing error in the same direction. Although an examination of the chart and a summation of the maximum

theoretical errors shows that the board could theoretically exhibit a ±3.5 LSB error, our testing assures this error

is never realized in a board that we ship.

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