Measurement-computing USB-2627 Manual do Utilizador descarregar pdf (Página 20)

Chapter 5

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

16 bits

Number of channels

16 single-ended

Input voltage range

±10 V

Absolute maximum input

voltage

CHx relative to AGND

 ±25 V max (power on)

 ±10.5 V max (power off)

Input impedance

 1 GΩ (power on)

 390 Ω (power off)

Input bias current

±100 pA

Input bandwidth

Small signal (–3 dB)

3.1 MHz

Input capacitance

40 pf

Maximum working voltage

±10.1 V max relative to AGND

Crosstalk

Adjacent channels, DC to

10 kHz

–80 dB

Input coupling

Sampling rate

0.0149 Hz to 1,000 kHz; software-selectable

Trigger source

TTLTRG

A/D pacing

 Internal input scan clock

 External input scan clock (XAPCR)

Burst mode

Burst rate = 1 µs, software selectable

Throughput

Software paced

33 S/s to 4,000 S/s typ; system dependent

Hardware paced

1 MS/s max

Channel queue

Up to 16 element list of random channels

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

(µV)

INL error

(% of range)

Absolute

accuracy at

Full Scale

(µV)

Gain

temperature

coefficient

(% reading/°C)

Offset

temperature

coefficient

(µV/°C)

±10 V

0.031

915

0.0076

4775

0.0013

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 28 29

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