Specifications; Analog Input; Accuracy And Resolution - Measurement Computing PCI-DAS-TC User Manual

Specifications

Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.

Analog input

A/D converter type
Number of channels
Programmable ranges
Voltage gains
Thermocouple types
A/D pacing
A/D trigger sources
Data transfer
Conversion rates (integrating time)
*Conversion rates (per channel)
Linearity error (A/D specs)
Gain drift (A/D specs)
Zero drift (A/D specs)
Power supply rejection ratio
Overvoltage protection
CMRR @ 60 Hz
Input leakage current
Input impedance
Absolute maximum input voltage
Isolation to PC

Accuracy and resolution

Gain Range
1 −2.5 to 10 V
125 −20 to 80 mV
166.7 −15 to 60 mV
−6.25 to 25 mV
400
Table 1. Analog input specifications
AD652 V/F converter
16 differential thermocouple inputs, 1 CJC input
−2.5 V to +10 V, −20 mV to +80 mV, −15 mV to +60 mV, −6.25 mV to 25 mV
1, 125, 166.7, 400
J, K, E, T, R, S, B
Continuous conversions. Software-programmable for 50 Hz, 60 Hz, or 400 Hz
Software-triggered
Single I/O register transfer through dual port RAM
50 Hz, 60 Hz, 400 Hz
Software programmable
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.
±0.05% @ 4 MHz clock
±75 ppm/°C max
±50 uV/°C max
0.01 %/V
−40 V to +55 V
80 dB minimum
±80 nA maximum
100 MegOhm minimum
−40 V to +55 V
500 V min through DC/DC converter and opto-isolators
Table 2. Voltage measurements
Accuracy (Worst Case)
±0.01% of reading ±2.5 mV
±0.01% of reading ±20 µV
±0.01% of reading ±15 µV
±0.02% of reading ±6.25 µV
5-1
Resolution
@ 50 Hz @ 60 Hz
312.5 µV 375 µV
2.5 µV 3.0 µV
1.88 µV 2.25 µV
0.781 µV 0.938 µV
Chapter 5
@ 400 Hz
2.5 mV
20.0 µV
15.0 µV
6.25 µV