Advantech iDAQ-817, Руководство пользователя

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iDAQ-817_821 User Manual 20
A.1 Analog Input (iDAQ-817)

Channels: 8 differential

Analog-to-digital converter (ADC) resolution: 16 bits

Analog-to-digital converter (ADC) type: Successive approximation (SAR)

Input range: ±10 V or ±20 mA, each channel can be configured independently
by software

Input common-mode voltage range: ±275 V max.

Input coupling: DC

Input impedance
– Differential, voltage measurement: 800 kΩ
– Common-mode, voltage measurement: 200 kΩ
– Current measurement: 500 Ω

Isolation protection: 600 V
RMS

Operation mode: Instant or buffered, software configurable

Buffered output
– Sample rate: (200 / n) kHz max., where n is the number of enabled chan -
nels, software configurable
– Convert clock rate: 200 kHz
– Internal data buffer (FIFO) size: 512 samples

Absolute accuracy
– Voltage input
Operating temperature within: ±5°C of last
auto-calibration temperature: ±0.01% of full-scale range max.
Over full operating temperature range: ±0.05% of full-scale range max.
– Current input
Operating temperature within: ±5°C of last
auto-calibration temperature: ±0.1% of full-scale range max.
Over full operating temperature range: ±0.5% of full-scale range max.

Temperature drift
–
Offset drift:
25 ppm/°C
– Gain drift: 15 ppm/°C

Bandwidth (-3dB):
78 kHz

DC performance
–
Idle channel noise:
0.34 mV
RMS
/0.7A
RMS
– Effective resolution: 15.8 bits

AC performance
– Signal-to-noise ratio (SNR): 86 dB
– Total harmonic distortion (THD): -98 dB
– Total harmonic distortion plus noise (THD+N): -86 dB
– Effective number of bits (ENOB): 14.0 bits
– Spurious-free dynamic range (SFDR): 103 dB
– Crosstalk: -85 dB