Measurement-computing USB-1608HS Instrukcja Użytkownika Pobierz pdf (Strona 23)

Chapter 4

Specifications

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

16-bit successive approximation type

Number of channels

Eight differential

Eight single-ended

Input configuration

Individual A/D per channel

Sampling method

Simultaneous

Analog input modes

Power up and reset state

CHx_H and CHx_L inputs are disconnected from their

screw terminal pins and internally connected to GND

(recommended configuration for unused inputs).

Single-ended

CHx_H inputs are connected directly to their screw

terminal pins.

CHx_L inputs are disconnected from their screw

terminal pins and internally connected to GND.

Differential

CHx_H and CHx_L inputs are connected directly to

their screw terminal pins.

Absolute maximum input

voltage

CHx IN to GND.

TRIG_IN to GND

±25 V maximum (power on)

±15 V maximum (power off)

Input impedance

CHx IN

1 GΩ (power on)

1.5 kΩ (power off)

Input bandwidth (-3 dB)

All input ranges

330 kHz

Input leakage current

±25 pA

Input capacitance

50 pf

Input ranges

Software-selectable per channel

±10 V, ±5 V, ±2 V, ±1 V

A/D pacing

Onboard A/D clock, external source (SYNC_IN). See

Table 8 on page 26.

A/D trigger source

TRIG_IN input. See Table 7 on page 25.

A/D trigger modes

External analog. See Table 7 on page 25.

Maximum working voltage

(signal + common mode)

±0.05% FSR maximum.

Sampling rate

0.009 S/s to 250 kS/s, software-programmable

Throughput

Software-paced

33 to 8000 S/s all channels, system-dependent

Scan to PC memory

250-kS/s per channel maximum (throughput rate may

be limited on USB 1.1 ports).

Resolution

16 bits

Differential non-linearity

(Note 1)

Calibrated

±2.0

Un-calibrated

± 0.5 LSB typical.

±1.0 LSB max.

CMRR (60 Hz)

±10 V range

81 db minimum

±5 V range

81 db minimum

±2 V range

92 db minimum

±1 V range

92 db minimum

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 29 30 31

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