Measurement-computing USB-7204 Instrukcja Użytkownika Pobierz pdf (Strona 21)

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. Analog input specifications

Parameter Conditions Specification

A/D converter type

Successive approximation type

Input modes Single-ended or differential (default)

Input voltage range for linear

operation, single-ended mode

CHx to GND ±10 volts (V) max

Input common-mode voltage range

for linear operation, differential

mode

CHx to GND –10 V min, +20 V max

Absolute maximum input voltage CHx to GND ±28 V max

Input impedance 122 kΩ

Input current (Note 1) Vin = +10 V 70 microamperes (µA) typ

Vin = 0 V –12 µA typ

Vin = –10 V –94 µA typ

Number of channels

8 single-ended / 4 differential, software-selectable

Configuration

Single A/D

Sampling method

Multiplexed

Input ranges, single-ended mode

±10 V G=2

Input ranges, differential mode

±20 V G=1

±10 V G=2 (default)

±5 V G=4

±4 V G=5

±2.5 V G=8

±2.0 V G=10

±1.25 V G=16

±1.0 V G=20

Software-selectable

Throughput (Note 2) Software paced 250 samples per second (S/s) typ, system dependent

Scan to system memory 0.596 to 50,000 S/s

Channel gain queue Up to 16 elements Software-selectable channel, range.

Resolution (Note 3) Differential 12 bits, no missing codes

Single-ended 11 bits

Integral linearity error

±1 least significant bit (LSB) typ

Differential linearity error

±0.5 LSB typ

Repeatability

±1 LSB typ

Trigger source Software-selectable External digital: TRIG_IN

Pacer source Software-selectable  Internal

 External (SYNC), rising edge triggered

 External Gated (SYNC), see Note 4

 Programmed IO

Calibration Factory Cal factors stored in firmware. Cal factors

must be applied via application software.

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