Measurement-computing PCI-DAS1002 Manuel d'utilisateur télécharger pdf (Page 18)

Chapter 4

Specifications

Typical for 25 °C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog input

Table 1. Analog input specifications

Parameter

Specification

A/D converter type

ADS7800 or equivalent

Resolution

12 bits

Number of channels

16 single-ended / 8 differential, software selectable

Input ranges

±10 V, ±5 V, ±2.5 V, ±1.25 V, 0 to 10 V, 0 to 5V, 0 to 2.5 V, 0 to 1.25 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 edge trigger

A/D pre-trigger mode

Unlimited pre- and post-trigger samples. Total number of samples must be greater than

512.

Burst mode

Software selectable option, burst rate = 150 kHz

Data transfer

From 1024 sample FIFO via REPINSW

Programmed I/O

A/D conversion time

3 µs max

Analog front end settling time

6 µs for a full scale step to 1 LSB

Calibrated throughput

200 kHz

Calibration

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

A/D full-scale gain drift

±0.25 LSB/°C max

A/D zero drift

±0.25 LSB/°C max

Common mode range

±10 V min

CMRR @ 60 Hz

-70 dB min

Input leakage current

±20 nA max

Input impedance

10 MOhms min

Absolute maximum input

voltage

±35 volts

Warm-up time

15 minutes

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 24 25 26

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