HBK Bruel & Kjaer 3670-A-082, Руководство пользователя

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Brüel & Kjær Production Test USB DAQ Type 3670 – User Manual 2
Type 3670 is delivered with a USB key (item no. BZ-5089) that contains: installation instructions,
audio drivers, a USB audio tool that allows use of Type 3670 without programming, factory calibration
information, a readme file with links to GitHub
®
for programming examples, and a product datasheet
for specification references.
The Input Channels
The input channels provide conditioning for the transducers, are synchronized and support sampling
frequencies up to 96 kHz. This provides a usable analogue input frequency range of 5 Hz to 40 kHz.
All input channels have both analogue and digital filters, providing alias protection for the 96kHz
sampling frequency and ensuring data integrity. They have a single voltage range from 5 µV to 5 V
peak that, when combined with the 24-bit resolution, provides the extremely low noise floor often
required for acoustic measurements. Moreover, the range supports the full portfolio of Brüel & Kjær
CCLD transducers making multiple input ranges unnecessary. This simplifies setup and avoids
overload and underrange errors when measuring.
The Output Channels
Output channels are synchronized in pairs (1-2, 3-4, etc.). The output channel amplifiers are DC-
coupled to 40 kHz and have a very low output impedance, allowing them to directly drive up to
150 mW into low-impedance loads like small speakers and headphones.
The Microcontroller
Type 3670 has an embedded microcontroller controlling 24-bit analogue-to-digital converters (ADC)
for the input channels and 24-bit digital-to-analogue converters (DAC) for the output channels. The
microcontroller performs all the necessary housekeeping of the ADC, DAC and industry-standard USB
2.0 interface, freeing the host PC to give maximum responsiveness for your application.
CCLD/ICP Power
Type 3670 is delivered with CCLD power ON for all input channels per default.
USB Audio Tool
✐
Please note:
• The USB Audio Tool included on the memory stick, is provided as is and is not covered
by any warranty.
• The USB Audio Tool is NOT to be considered as a measurement tool.
The USB Audio Tool provides a simple manual interface that can be used for a quick check of the
functionality of both input and output of Type 3670.
The tool includes limited generator functionality, a time signal and FFT signal window, all described
briefly below.