Measurement-computing PCI-DAS1200 Manual do Utilizador descarregar pdf (Página 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

Bipolar: ±10 V, ±5 V, ±2.5 V, ±1.25 V

Unipolar: 0 to 10 V, 0 to 5 V, 0 to 2.5 V, 0 to 1.25 V

Software selectable

A/D pacing

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

software polled

Burst mode

Software selectable option, burst rate = 3 µs

A/D trigger sources

External digital: A/D External Trigger

A/D triggering modes

External 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

330 kHz min

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)

± 0.02% of reading max

No missing codes guaranteed

12 bits

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 MOhm, min

Absolute maximum input voltage

±35 V

Noise distribution:

Rate = 1-330 KHz, average % ± 2 bins, average % ±1 bin, average # bins

 All ranges: 100% / 100% / 3 bins

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

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