Measurement-computing PCI-DAS-TC Manual do Utilizador descarregar pdf (Página 15)

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

A/D converter type

AD652 V/F converter

Number of channels

16 differential thermocouple inputs, 1 CJC input

Programmable ranges

2.5 V to +10 V, 20 mV to +80 mV, 15 mV to +60 mV, 6.25 mV to 25 mV

Voltage gains

1, 125, 166.7, 400

Thermocouple types

J, K, E, T, R, S, B

A/D pacing

Continuous conversions. Software-programmable for 50 Hz, 60 Hz, or 400 Hz

A/D trigger sources

Software-triggered

Data transfer

Single I/O register transfer through dual port RAM

Conversion rates (integrating time)

50 Hz, 60 Hz, 400 Hz

Software programmable

*Conversion rates (per channel)

25.0 msec @ 50 Hz typical, 25.5 msec maximum

21.6 msec @ 60 Hz typical, 22.1 msec maximum

7.4 msec @ 400 Hz typical, 7.9 msec maximum

*This is the total time to convert the channel, process the data, and provide a

delay to switch the gain and channel.

Linearity error (A/D specs)

±0.05% @ 4 MHz clock

Gain drift (A/D specs)

±75 ppm/°C max

Zero drift (A/D specs)

±50 uV/°C max

Power supply rejection ratio

0.01 %/V

Overvoltage protection

40 V to +55 V

CMRR @ 60 Hz

80 dB minimum

Input leakage current

±80 nA maximum

Input impedance

100 MegOhm minimum

Absolute maximum input voltage

40 V to +55 V

Isolation to PC

500 V min through DC/DC converter and opto-isolators

Accuracy and resolution

Table 2. Voltage measurements

Gain

Range

Accuracy (Worst Case)

Resolution

@ 50 Hz

@ 60 Hz

@ 400 Hz

2.5 to 10 V

±0.01% of reading ±2.5 mV

312.5 µV

375 µV

2.5 mV

125

20 to 80 mV

±0.01% of reading ±20 µV

2.5 µV

3.0 µV

20.0 µV

166.7

15 to 60 mV

±0.01% of reading ±15 µV

1.88 µV

2.25 µV

15.0 µV

400

6.25 to 25 mV

±0.02% of reading ±6.25 µV

0.781 µV

0.938 µV

6.25 µV

1 2 ... 10 11 12 13 14 15 16 17 18 19 20

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