TRACERDAQPRO datasheet(2/8 Pages) ETC

2 / 8 page

Measurement Computing

(508) 946-5100

info@mccdaq.com

mccdaq.com

USB-2404 Series

Features

•

Stopband bandwidth: The filter significantly attenuates

all signals above the stopband frequency (0.547 · ƒ

S, where

S is the sample rate). The filter is used primarily to pre-

vent aliasing, so the stopband frequency scales precisely

with the sample rate.

The stopband rejection (100 dB) is the minimum amount

of attenuation applied by the filter to all signals with fre-

quencies within the stopband bandwidth.

•

Alias-Free bandwidth: Signals that appear in the alias-free

bandwidth these devices are not aliased artifacts of signals

at a higher frequency. The alias-free bandwidth (0.453 · ƒ

is defined by the ability of the filter to reject frequencies

above the stopband frequency. The alias-free bandwidth

equals the sample rate minus the stopband frequency.

Terminal Connectors

Each channel has a 2-position detachable screw terminal for field

wiring connections. Ten additional two-position connectors are

available with the optional ACC-102 connector kit.

High-Voltage Applications

For high-voltage applications with the USB-2404-10 or the

USB-2404-60, MCC recommends using the ACC-160 backshell

to ensure that the terminals are not accessible. The backshell

also provides strain relief to protect the USB-2404-10/2404-60

screw terminals

For high-voltage applications with the USB-2404-UI, MCC

recommends using the ACC-176 backshell to ensure that the

terminals are not accessible.

Timing Options

The following timing options are supported. Each option is

optimized for different types of applications by using different

ADC conversion times.

•

High Speed – Optimized for high-speed applications at

the expense of noise rejection.

•

Best 60 Hz Rejection – Optimized for rejection of 60 Hz

noise.

•

Best 50 Hz Rejection – Optimized for rejection of 50 Hz

noise.

•

High Resolution – Optimized for maximum overall noise

rejection, and provides a good rejection of both 50 Hz and

60 Hz noise.

Refer to the analog input specifications for the conversion time

and rejection ratio of each option.

Terminal Connectors

Each channel has a 6-position detachable spring connector for

field wiring connections. Four additional six-position connectors

are available with the optional ACC-164 connector kit.

USB-2404-10 and USB-2404-60

The USB-2404-10 and the USB-2404-60 each provide four chan-

nels of 24-bit simultaneous analog inputs and a sampling rate

of 50 kS/s per channel, maximum. A master timebase frequency

controls the sample rate. The input voltage range is ±10 V for

the USB-2404-10, and ±60 V, for the USB-2404-60.

Anti-Alias Filtering

The anti-alias filter removes noise that may be present in the

signals prior to conversion. These devices combine analog and

digital filtering to accurately represent in-band signals while

rejecting out-of-band signals. The filters discriminate between

signals based on the frequency range, or bandwidth, of the signal.

Thepassband,stopband,andalias-freebandwidthsareimportant.

These devices represent signals within the passband frequency, as

quantified primarily by passband ripple and phase nonlinearity.

All signals within the alias-free bandwidth are either unaliased

signals or signals that have been filtered by at least the amount

of the stopband rejection.

•

Passband bandwidth: The signals within the passband

bandwidth have frequency-dependent gain or attenuation.

The small amount of variation in gain with respect to fre-

quency is the passband flatness. The device's digital filters

adjust the frequency range of the passband to match the

data rate, so, the amount of gain or attenuation at a given

frequency depends on the sample rate.

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