Measurement-computing USB-1602HS-2AO Manual de usuario descargar pdf (Pagina 38)

Chapter 5

Specifications

All specifications are subject to change without notice.

Typical for 25 °C unless otherwise specified.

All signal names refer to 68 pin SCSI connector, unless otherwise specified.

Analog input

Table 1. Analog input specifications

Parameter

Conditions

Specification

A/D converter type

16-bit successive approximation type

Number of AI channels

2 SE simultaneous

Input configuration

Single-ended

Sampling method

Simultaneous; individual A/D per channel

Input ranges

±10 V, ±2.5 V, ±500 mV

Absolute maximum input

voltage

±30 V maximum (power on)

±20 V maximum (power off)

Input impedance

10 MΩ (typical, power on)

Input bias current

< 2 µA

Input bandwidth (-3 dB)

3 MHz, typical

Crosstalk

Remaining inputs grounded

100 dB (at 100 kHz )

Pacer sources

 Onboard A/D clock or external digital source

(XAPCR or EXT CLK BNC)

 External pacing (XAPCR or EXT CLK BNC)

See Table 12 for additional information.

Trigger sources and modes

See Table 11

Sampling rate

0.01 S/s to 2 MS/s each channel, software

programmable

Clock sources

Internal, software programmable or external pacing

Resolution

16-bits

INL (integral non-linearity)

±2.0 LSB

DNL (differential non-linearity)

±1.0 LSB

Table 2. Calibrated accuracy

Range

Accuracy

±10 V

±1 mV

±2.5 V

±0.5 mV

±500 mV

±0.15 mV

Table 3. Noise performance, note 1

Range

Typical counts

LSB rms

±10 V

1.3

±2.5 V

1.6

±500 mV

2.5

Note 1: Noise distribution is determined by gathering 50,000 samples with inputs tied to ground at the

BNC connectors. Samples are gathered at the maximum specified rate.

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