Portable, Modular Signal Conditioning Modules

8

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NI SCC-ACC01 Accelerometer Input

The National Instruments SCC-ACC01 is a single-channel module that

accepts Integrated Electronic Piezoelectric (IEPE) compatible sensors

such as accelerometers and microphones. The NI SCC-ACC01 has an

amplifier with a gain of two, a 0.8 Hz highpass filter, and a 19 kHz

3-pole Bessel lowpass filter. The maximum input range is ±5 V. In

addition, this module has a 4 mA current source to power an

accelerometer or microphone.

When you install the SCC-ACC01 into the SC-2345, the carrier routes

the single output voltage to one input channel of the multifunction DAQ

device, channel x, where x is 0 through 7. For example, if installed into

the J1 socket of the SC-2345, the output voltage is routed to input

channel 0 of the DAQ device.

Specifications

SCC-ACC01

Analog Input

Number of input channels ..................

1 differential

Input range ..........................................

±5 VAC (fixed gain of 2)

Input coupling .....................................

AC

-3 dB cutoff frequency....................

0.8 Hz

Filter type ............................................

Lowpass 3-pole Bessel

-3 dB cutoff frequency....................

19 kHz

Passband flatness ...............................

±0.3 dB, 10 Hz to 5 kHz

±1 dB, 5 Hz to 10 kHz

Maximum working voltage

(signal + common mode) ................

Each input should remain within

±12 V of ground

Overvoltage protection .......................

±40 VAC + DC (powered on

or off)

Input impedance .................................

5 MΩ in series with 0.39 µF

(powered on or off)

System noise.......................................

Transfer Characteristics

Gain ....................................................

2

Gain error ............................................

±1%

Gain-error temperature coefficient.....

±10 ppm/°C

Offset error..........................................

±3 mV (referred to input)

Offset-error temperature coefficient ..

±1.6 µV/°C

Nonlinearity.........................................

10 ppm of full scale

Recommended warm-up time.............

5 minutes

Amplifier Characteristics

CMRR ..................................................

80 dB at 60 Hz

Output range .......................................

±10 V

Excitation

Number of channels............................

1

Constant-current source .....................

4 mA

Maximum voltage level

without losing regulation ...............

24 V

Drift ....................................................

±127 ppm/°C

Environment

Operating temperature .......................

0 to 50 °C

Relative humidity ................................

5 to 90% noncondensing

Power Requirements

Analog .................................................

89 mW

Digital..................................................

420 mW

Model

Channel

Description

Part Number

SCC-ACC01

1

Accelerometer input

777459-19