Measurement-computing USB-202-OEM Manuel d'utilisateur télécharger pdf (Page 14)

Chapter 4

Specifications

All specifications are subject to change without notice.

Typical for 25 °C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog input

Table 1. General analog input specifications

Parameter Condition Specification

A/D converter type Successive approximation

ADC resolution 12 bits

Number of channels 8 single-ended

Input voltage range ±10 V

Absolute maximum input

voltage

CHx relative to AGND  ±25 V max (power on)

 ±25 V max (power off)

Input impedance  1 MΩ (power on)

 1 MΩ (power off)

Input bias current

10 V input

–12 µA

0 V input 2 µA

–10 V input 12 µA

Input bandwidth Small signal (–3 dB) 150 kHz

Maximum working voltage Input range relative to

AGND

±10.1 V max

Crosstalk Adjacent channels, DC to

10 kHz

–75 dB

Input coupling DC

Sampling rate Internal pacer 0.016 S/s to 100 kS/s, software-selectable

External pacer 100 kS/s max

Sample clock source  Internal A/D clock

 Pacer input terminal AICKI

Channel queue Up to eight unique, ascending channels

Throughput Software paced 33 S to 4,000 S/s typ, system dependent

Hardware paced 100 kS/s max, system dependent

Warm-up time 15 minutes min

Accuracy

Analog input DC voltage measurement accuracy

Table 2. DC Accuracy components and specifications. All values are (±)

Range

Gain error

(% of reading)

Offset error

(mV)

Absolute accuracy

at Full Scale

(mV)

Gain temperature

coefficient

(% reading/°C)

Offset

temperature

coefficient

(mV/°C)

±10V 0.098 11 20.8 0.016 0.87

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 20 21

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