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RT USB3000

Technical Description and User Manual.

Revision 4.1.

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1. GENERAL INFORMATION.......................................................................................................................................2

2. SPECIFICATIONS........................................................................................................................................................3

3. OPERATING MODES..................................................................................................................................................7

3.1. “ADC” MODE...........................................................................................................................................................7

3.2. “DAC” MODE...........................................................................................................................................................7

3.3. “LOGIC ANALYZER” MODE ......................................................................................................................................8

3.4. “ADC + DAC” MODE ..............................................................................................................................................8

3.5. “LOGIC ANALYZER + DAC” MODE ..........................................................................................................................8

4. SYNCHRONIZATION .................................................................................................................................................9

4.1. START SYNCHRONIZATION.......................................................................................................................................9

4.2. ACQUISITION SYNCHRONIZATION ............................................................................................................................9

5. CONNECTING THE DEVICE..................................................................................................................................10

5.1. CONNECTING THE DEVICE TO THE PC FOR THE FIRST TIME ....................................................................................11

5.2. CONNECTING TO THE OBJECT .................................................................................................................................14

5.2.1. CONNECTING TO THE ANALOG PORT.................................................................................................................14

5.2.2. CONNECTING TO THE DIGITAL PORT .................................................................................................................16

6. SOFTWARE.................................................................................................................................................................17

6.1. QMLAB SOFTWARE SUITE......................................................................................................................................17

6.2. SOFTWARE DEVELOPMENT KIT...............................................................................................................................18

- Technical support

Summary of content (18 pages)

PAGE 1
RT USB3000 Technical Description and User Manual. Revision 4.1. 1. GENERAL INFORMATION .......................................................................................................................................2 2. SPECIFICATIONS........................................................................................................................................................3 3. OPERATING MODES..............................................................................................
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1. General information The RT USB3000 device is a compact multipurpose eight-channel ADC with USB 2.0 interface. The device additionally includes a two-channel DAC and digital inputs/outputs. The RT USB3000 device is designed for analog-to-digital conversion of signals with 0...1.5 MHz spectrum components. The device may be used as a multichannel oscilloscope, spectrum analyzer, logic analyzer as well as full-fledged data recorder with indefinite continuous data storage on PC.
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2. Specifications Analog-to-Digital Converter (ADC) Number of input channels 8 differential Input signal range ±5V Max. aggregate throughput (all channels) 3 MS/s Max. sampling rate (one channel) 3 MS/s Max. channel switching frequency 3 MHz ADC resolution 14 bits Sensitivity 1 mV Reference limiting error 0.
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Power supply From the USB bus or the external source1 Consumed current Up to 480 mA Dimensions 140 х 110 х 35 mm External environment for usage and storage External environment Storage temperature from +5°С up to +55°С with relative moisture from 5% up to 90% from –10°С up to +70°С Figures below show typical characteristics of a RT USB3000 ADC device: Harmonic distortion; noise in the ½ fADC band; values spread from ADC with constant voltage on analog input; the graph of Crosstalk dependency towards
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Fig. 2. Harmonic distortion. Input signal - sine-wave 10 kHz, 5V. fADC = 3MHz. Fig. 3. Values spread from ADC with constant voltage (0V) on analog input. fADC = 3MHz. RT USB3000 Technical Description and User Manual Rev. 4.1.
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0 -10 -20 Crosstalk, dB -30 -40 -50 -60 -70 -80 -90 -100 0 1 2 3 Frequencies of channel switching, МHz Fig. 4. Crosstalk dependency towards channel switching frequency RT USB3000 Technical Description and User Manual Rev. 4.1.
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3. Operating modes The device hardware solution and standard software make it possible to implement the following operating modes: 3.1. “ADC” mode In the “ADC” mode RT USB3000 device provides the multi-channel input of analog signals with the ADC frequency up to 3 MHz and the channel switching frequency up to 3 MHz. Data from the ADC are signed double-byte integers ranging from -8000 (corresponds to the voltage of -5V at the analog input) to 8000 (corresponds to the voltage of +5 V at the analog input).
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3.3. “Logic Analyzer” mode In the “Logic Analyzer” mode RT USB3000 device provides the input into a PC of digital signals from 10 input digital lines with the sampling frequency up to 6 MHz. The data enters into a PC in the form of double-byte words, their 10 least significant bits correspond to the logic state on 10 input digital lines of the device ("1" - corresponds to high level at the input). The 6 most significant bits are always equal "0".
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4. Synchronization 4.1. Start synchronization By default the device starts the acquisition (from ADC or from digital inputs) since after issuing the command “Start” from a PC. This command can be executed within a few milliseconds. The exact execution time of this command under OS Windows (that is not a real-time OS) is impossible to be learnt in advance.
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5. Connecting the device The figure shows the front panel of a RT USB3000 device: Analog Port “Link” LED USB Port “Link” LED — turns on when the device is connected to USB and signals that the USB port of the computer has identified the device correctly. USB port — type B. A standard connector for connecting the device to the PC via USB with an standard USB A-B cable. Analog Port - type DRB-37M. It is used for the connection of the analog signals to the RT USB3000 device.
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The procedure of connecting the RT USB3000 device is as follows: 1. If you are going to use the external power supply, connect the power supply from the delivery set of the device to AC network and to the Power Supply Port of the device. 2. Connect the device to the PC via a USB cable. At this the “Link” LED should turn on. When the device is connected for the first time, driver installation might be required. For further information see Connecting the device to the PC for the first time. 3.
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In the Device Manager RT USB3000 will appear as Unknown device. You should right-click on it and select “Update Driver Software”: After this the Found New Hardware Wizard will start up: RT USB3000 Technical Description and User Manual Rev. 4.1.
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You should select “Browse my computer for driver software” and specify the “\DRV” folder on the included CD as the location of the driver. Then you should follow the instructions of the Wizard. Once the driver is successfully installed, the “RT USB3000 ADC/DAC Unit (USB 2.0)” device should appear in the Device Manager: This means that the device has been identified correctly by the PC, the driver is installed and the device is ready to work.
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5.2. Connecting to the object 5.2.1. Connecting to the Analog Port The analog port of the device is described in the table, where Хn —non-inverting, and Yn — inverting inputs of the differential channel n; NC — the pin is reserved. Pin num. Description Pin num.
PAGE 15
The analog inputs of the RT USB3000 device are differential. Differential connection of a signal source reduces the level of common-mode noise. Besides, differential inputs allow connecting signal sources so that currents of signal circuits do not flow through a single wire, which increases measurement accuracy.
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5.2.2. Connecting to the Digital Port The digital port of the device is described in the table, where NC — the pin is reserved. Pin num. Description Pin num.
PAGE 17
6. Software Software of the RT USB3000 device consists of the following components: - QMLab software suite - Software development kit (SDK package) 6.1. QMLab software suite The QMLab software suite is a universal software tool for working with QMBox devices. It allows performing most standard tasks within measurement automation.
PAGE 18
6.2. Software development kit Apart from the complete QMLab software suite, the RT USB3000 delivery set includes an SDK package, which is software and documentation designed for users who would like to create their own applications for working with the device. This software consists of function libraries (API) and examples of software development. The user has a possibility to create full-blown applications using just a limited number of library functions.