Measurement-computing PC-CARD-DAS16/330 Instrukcja Użytkownika Pobierz pdf (Strona 20)

Chapter 5

Specifications

Typical for 25 °C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog input

Table 1. Analog input specifications

A/D converter type ADS7800

Resolution 12 bits

Number of channels 16 single-ended

Input ranges ±10 V, ±5 V - software programmable

A/D pacing

(software programmable)

 Internal counter - 82C54

 External source - A/D External Pacer,

software programmable for rising or falling edge

 Software polled

A/D trigger sources External edge trigger (A/D External Trigger)

A/D triggering modes Rising or falling edge trigger - software selectable

A/D External Trigger, gate high or low, software selectable A/D gate sources

A/D Pacer Gate, gate high

Burst mode Software selectable option, burst rate = 333 kHz

From 4 k sample FIFO via REPINSW Data transfer

Programmed I/O

A/D conversion time 3 µs max

Calibrated throughput 330 kS/s, minimum system requirement is Pentium II, 400 MHz.

Calibration Auto-calibration, calibration factors for each range stored on board in nonvolatile RAM

Accuracy

Accuracies are listed for a 333 kS/s sampling rate, single channel operation, a 60 minute warm-up, and

operational temperatures within ±2 °C of internal calibration temperature. The calibrator test source high side is

tied to Channel 0 In and the low side tied to AGND.

Table 2. Absolute accuracy specifications

Range Absolute Accuracy

±10.000 V ±3.0 LSB

±5.000 V ±3.0 LSB

Each PC-CARD-DAS16/330 is tested at the factory to assure the board’s overall error does not exceed

accuracy limits described in Table 2.

Table 3. Calibrated accuracy components (LSB)

Range Gain Error Offset Error

DLE

(Note 1)

ILE

(Note 1)

±10.00 V ±1.0 max ±1.0 max ±1.0 max ±1.0 max

±5.000 V ±1.0 max ±1.0 max ±1.0 max ±1.0 max

Note 1: These are the intrinsic specifications of the ADC. Software calibration may introduce a small

additional amount of linearity error.

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