Measurement-computing PCI-DAS1001 Instrukcja Użytkownika Pobierz pdf (Strona 17)

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

7800

Resolution

12 bits

Number of channels

8 differential or 16 single-ended, software selectable

Input ranges

±10 V, ±1 V, ±0.1 V, ±0.01 V, 0 to 10 V, 0 to 1 V, 0 to 0.1 V, 0 to 0.01 V.

Fully programmable

Polarity

Unipolar/bipolar, software selectable

A/D pacing

Programmable: internal counter or external source (A/D External Pacer, positive or

negative edge selectable by software), or software polled

Burst mode

Software selectable option, rate = 6.67µs

A/D trigger sources

External digital (A/D External Trigger)

A/D triggering modes

Digital: Software enabled, rising edge, hardware trigger

Pre-trigger: Unlimited pre- and post-trigger samples. Total # of samples must

be > 512.

Data transfer

From 1024 sample FIFO via REPINSW, interrupt or software polled

A/D conversion time

3 µs

Throughput

150 kHz

Relative accuracy

±1.5 LSB

Differential linearity error

±0.75 LSB

Integral linearity error

±0.5 LSB typ, ±1.5 LSB max

Gain error (relative to

calibration reference)

0.01 V range: ± 0.4% of reading, max

All other ranges: ± 0.02% of reading, max

No missing codes guaranteed

12 bits

Calibration

Auto-calibration, calibration factors for each range stored on board in non-volatile

RAM

Gain drift (A/D specs)

±6 ppm/°C

Zero drift (A/D specs)

±1 ppm/°C

Common mode range

±10 V

CMRR @ 60 Hz

70 dB

Input leakage current

200 nA

Input impedance

10 MOhms, min

Absolute maximum input

voltage

±35 V

Noise distribution

Rate = 1-150 kHz, average # bins

10 V ranges: 3 bins

1 V ranges: 4 bins

0.1 V ranges: 10 bins

Bipolar 0.01 V range: 20 bins

Unipolar 0.01 V range: 32 bins

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 23 24

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