Measurement-computing DataShuttle Uživatelský manuál stáhnout pdf (Strana 86)

9-8 ACAO Analog Output & Control Board Technical Notes

11-13-01

DataShuttle and DynaRes

Product Specifications

Analog Outputs

The ACAO-12-2 features two analog outputs; the ACAO-12-8 includes eight analog output channels.

Analog Output Ranges

The ACAO can output either voltage or current. Selectable voltage ranges include 0–5V, 0–10V, and ±5V;

current is output in the 4-20mA range only.

Resolution

The ACAO can operate with resolution of up to 12 bits.

Speed

The ACAO has a maximum output rate of 130kHz on a standard IBM PC running at 4.77MHz (rates are

somewhat faster in faster computers).

For the multi-channel output rate, divide the maximum 130kHz rate by the number of channels using an

assembly language program.

Maximum/Minimum Output

In Voltage Output Mode

•

Output Current: ±15mA minimum

•

Output Protection: May be shorted to any voltage between +12 and -12V

•

Output Impedance: <0.1

Ω

In Current Output Mode

•

Maximum Output Voltage: +50V

•

Minimum Output Voltage: +2.6V

•

Output may be shorted to any voltage between 0 and +50 volts

Accuracy ACAO General Conditions Accuracy

Range Absolute Accuracy Maximum Offset

0 to 10V 0.02% 0.01%

0 to 5V 0.02% 0.02%

±5V 0.07% 0.06%

4 to 20 mA 0.15% 0.04%

Relative accuracy for all ranges is a maximum of 0.01%.

There is a 0.01% maximum linearity for all ranges, guaranteed monotonic. The differential linearity is a

maximum of 0.01%.

Stability

In Voltage Output Mode

•

Temperature Drift:

With self-calibration is 0.002% / ºC maximum

Without self calibration is 0.008% / ºC maximum

•

Response time to 0.01% accuracy:

Small step is 2.5µs

5V step is 20µs

10V step is 35µs

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