QMBox20 User Manual - R Tech Electronics
Contents
1. the correct connection of 1 phase and 2 phase differential signal sources to the device Note that even single phase signal sources should be connected to a differential input with three wires The single phase signal The differential signal Sources sources QMBox20 User manual Rev 2 1 13 of 15 7 Software ooftware of the QMBox20 devices consists of the following components QMLab software suite Software development kit SDK package 7 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 The QMLab suite allows you to start work immediately after the device is connected acquire process visualize and save the already calibrated data converted to the required measurement units without help of programmers or metrologists The QMLab suite includes e data recorder oscilloscope spectrum analyzer primary data processing unit Primary data processing can include calibration averaging calculation of the signal rate of change etc For further processing data is saved in standard text and binary formats suitable for conventional and specialized data processors Excel MathLAB Cool Edit pro etc A detailed description of the QMLab suite is given in the QMLab User Manual document that can be found on the site www RTechElectronics com and on the CD supplied with the d2. 0x190x60 mm 140x190x80 mm 260x260x160 mm QMBox20 User manual Rev 2 1 3 of 15 Figures below show typical characteristics of a QMBox20 device Harmonic distortion noise in the 2 fapc band the graph of Crosstalk dependency towards channel switching frequency Lil MIT HANI i Fw b Hl Ll il BU Noise in fapc band fapc 3MHz Harmonic distortion Input signal sine wave 10 kHz 5V fanc 3MHz QMBox20 User manual Rev 2 1 4 of 15 Crosstalk dB 0 1 2 Frequencies channel switching MHz Crosstalk dependency towards channel switching frequency QMBox20 User manual Rev 2 1 5 of 15 3 Architecture The basic components of QMBox20 devices are 8 channel QMS20 ADC modules that are installed into one case Depending on the number of modules installed a QMBox20 device can have 2 3 or 8 module configurations thus different models of the device differ in the number of input channels Model QMBox20 16 QMBox20 24 QMBox20 64 Number of the installed Number of input 32 to 64 Dimensions 140x190x60 mm 140 190 80 mm 260x260x160 mm The two module device QMBox20 16 is used to demonstrate QMBox20 internal construction 2 3 4 A the assembled device B the same device with the cover removed 1 Bottom shell 2 3 QMS20 ADC modules 2 pieces 4 Interface board that controls operation of the modules and ensures connectio
3. Device Manager File Action View Help eg EI 7 raus or ws db Update Driver Software Unknown Device How do you want to search for driver software gt Search automatically for updated driver software Windows will search your computer and the Internet for the latest driver software for your device unless you ve disabled this feature in your device installation settings gt Browse my computer for driver software Locate and install driver software manually 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 USB30K QMSystem Crate Controller USB device should appear in the Device Manager gt Ports COM amp LPT n Processors a R Technology Devices JF RT USB30K QMSystem Crate Controller USB p amp Sound video and game controllers p 4M System devices D 9 Universal Serial Bus controllers This means that the device s Interface board has been identified correctly by the PC the driver is installed and the device is ready to work Afterwards when the QMBox device is connected to another USB port of the PC Windows might once again detect the QMBox device as unknown device In this case you will have to repeat the driver installation pro
4. QMBox20 series devices QMBox20 16 QMBox20 24 QMBox20 64 Technical Description and User Manual Revision 2 1 TECH 1 CGENERALINFORMATION 80 0 8 0 09 009 00 9 0 2 2 SPECIFI ATIONS c 3 3 ARCHITECTURE D 6 4 PRINCIPLE COP OPERA TION 7 5 JACOUISEEION SENCHRONEZA TION 8 6 CONNECTING aae anri rena 08025002485 Di ENEE zIa PEDI SEA Do ER PSU E Red ERU 9 6 1 CONNECTING THE DEVICE TO THE PC FOR THE FIRST TIME 10 6 2 CONNECTING TO THE ODIEC 12 T 14 7 1 OMEA SOFIN AR 14 7 2 SOFTWARE DE VELOPMENT rH AES 15 Contacts http www RTechElectronics com Info RTechElectronics com Common questions Sales RTechElectronics com Sales department Support RTechElectronics com Technical support 1 General information The QMBox20 series devices are multichannel ADCs with USB 2 0 interface Depending on their model the devices may feature 16 to 64 differential analog inputs The devices of QMBox20 series are designed for analog to digital conversion of signals with 0 1 5 MHz spectrum components The devices may be used as multichannel oscilloscop
5. cedure as described above QMBox20 User manual Rev 2 1 11 of 15 6 2 Connecting to object The figure shows the front panel of a QMBox20 device QMBox20 16 model consists of 2 QMS20 modules Input Ports Every QMS20 module which is a part of the QMBox20 device has its own input port for the signals connection The input port of the QMS20 module is described in the table where Xn non inverting and Yn inverting inputs of the differential channel n NC the pin is reserved Z 2 2 O OO amp lt lt 212121212 11 AGND Analog ground 12 Y8 input 13 Y7 input 14 Y6 input 15 Y5 input 16 Y4 input 17 input 18 Y2 input Y1 input e analog supply output analog supply output GI GC CO CO 0 DO PO DO DO DO DO PO PO DO CO 6 7 CO Description SYN synchronization input 3 3 V digital supply output AGND Analog ground X8 input X7 input X6 input X5 input X4 input X3 input X2 input X1 input 2 7 Z 7 22 2 See Acquisition synchronization Allowable potential on the SYN input is 0 3 5 V relative to the ground mms contacts 11 28 Analog ground is connected to USB ground inside the device QMBox20 User manual Rev 2 1 12 of 15 The analog inputs of the QMBox20 devices are differential Differential connection of a signal source reduces th
6. e 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 The correct connection of the sources of analog signal is the most important condition of the correct operation of acquisition system which allows to avoid a lot of problems during the device operation During the connection of the sources of analog signal to the device it is necessary to keep to the following recommendations 1 Differential connection presupposes measuring voltage difference between the inverting and non inverting inputs of the channel i e differential voltage However it is necessary to remember that the voltage in relation to the analog ground of the device on both inputs common mode voltage should not be higher than the acceptable input signal range 2 Correct connection of a signal to the differential input is always a three wire connection It is necessary to separate signal wires connected to a high impedance input from the common ground wire Thus circuit of high current through signal wires which reduces measurement accuracy is eliminated 3 When several signal sources are connected to the device it is advisable that their common wires connect at one point only on the AGND pin of the input port This will eliminate formation of ground loops that are a source of extra noise On the scheme there are the examples of
7. es spectrum analyzers as well as full fledged data recorders with indefinite continuous data storage on PC Features e Design of input circuits ensures high input impedance at any operation mode hence higher precision of measurement is obtained Communication with PC provides a possibility of simultaneous acquisition visualization and storage of data without gaps or recording time limits e Free PC software Windows OS is sufficient to operate the device without any additional calibration or programming QMBox20 User manual Rev 2 1 2 of 15 2 Specifications Model 20 16 QMBox20 24 QMBox20 64 LLL Design QE onu SU 0 rir i 2 del D FE u uai m Input type Differential Input signal range 5 V 0 99 V programmable per channel Max aggregate throughput all 6 MS s 9 MS s 10 MS s channels Max sampling rate one 3 MS s channel ADC resolution 14 bits Sensitivity at input range 5 V 1mV at input range 0 99 V 0 25 mV 0 05 96 25 pF Typical common mode rejection 75 dB ratio input signal 4 V 10 KHz Typical crosstalk for input signal 10 kHz with channel 89 dB switching frequency 2 MHz Input overvoltage protection 25 250 Permanent overvoltage 10 sec Impulse 1 ms Power supply 100 240 V AC or 24 V DC External environment from 5 C up to 55 C with relative moisture from 5 up to 90 Dimensions 14
8. evice QMBox20 User manual Rev 2 1 14 of 15 7 2 Software development kit Apart from the complete QMLab software suite the QMBox20 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 These library functions are written so that even an inexperienced programmer who is not well versed in multithreaded and object oriented programming can work with the device A more detailed description of the software development kit is given the QMBox Programming Guide document that can be found on the site www RTechElectronics com and on the CD supplied with the device QMBox20 User manual Rev 2 1 15 of 15
9. fer session the QMBox20 device digitizes input analog signals at a preset rate and sends the data through the interface board to the computer via USB In the PC the data is put to a circular buffer in RAM During the buffer filling the data is taken from it by the application software for further processing visualization and saving to the hard disk Since the software takes data from the buffer at a rate higher than the rate of its receipt from the device the data transfer session can last for however long and data from the device is received by the computer without gaps Thus the device can be used as a full fledged data recorder without record time limits 1 It should be taken into consideration that the overall rate of all the channels in use cannot be arbitrarily high For example the aggregate throughput parameter of the QMBox20 16 device 6 MS s see Technical Specifications This means that one can use all the 16 channels of the device with the sampling rate not higher than 6 16 2 0 375 MHz or 6 channels with the rate not higher than 6 6 1 MHz or 2 channels with the maximum possible rate 6 2 3 MHz QMBox20 User manual Rev 2 1 7 of 15 5 Acquisition synchronization All the modules installed in the device are clocked by the same generator on the interface board That is why in the course of work the modules of the device are precisely synchronised with each other However sometimes it is necessary n
10. ls 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 Power Supply Port it is used for supplying power from an external supply included in the delivery set The procedure of connecting the QMBox series devices is as follows 1 Connect the power supply from the delivery set of the device to the Power Supply Port of the device 2 Connect the power supply from the delivery set of the device to AC network 3 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 4 Connect the signal sources to the device see Connecting to the object The procedure of disconnecting the the QMBox series devices is as follows 1 Disconnect the object signal sources from the device 2 Disconnect the device from the PC 3 Disconnect the power supply from the AC network 4 Disconnect the power supply from the device QMBox20 User manual Rev 2 1 9 of 15 6 1 Connecting the device to the PC for the first time When the QMBox series device is connected to a Windows PC for the first time it is necessary to specify the location of the device driver Before connecting the device to the PC for the firs
11. n of the device to the computer via USB 5 Interconnect board that ensures electric connection of the modules to the interface board Inside the case the QMS20 modules are plugged into the slots of the interconnect board This board joins the modules into a single device and ensures electric connection of the modules to the interface USB board The interface board controls operation of the modules and ensures connection of the device to the PC via USB This scalable modular architecture allows to combine modules of different types ADC DAC Discrete o I O etc in a single device These modules can be combined in device in any configuration For detailed information about Combined devices see http www rtechelectronics comvproducts qmbox index php QMBox20 User manual Rev 2 1 6 of 15 4 Principle of operation The QMBox20 series devices operate under PC control OS Windows via USB connection The software supplied with QMBox20 devices performs stream input of data from the ADC to the PC memory its processing and further visualization on the display as well as saving to the PC hard disk QMBox hardware Object Analog signals Before starting work the configuration is performed by means of the software the operation parameters of the device are set sampling rate the number of channels in use etc After this the device is started i e the data transfer session is launched During the data trans
12. ot only to synchronize the modules with each other but to precisely time the entire device to be started by a certain external event By default the device starts the acquisition since after issuing the command Start from 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 For the cases when it is necessary to bind the start of the data acquisition to any external event with high precision one can use the external start synchronization mode In this mode for the beginning of the acquisition after the issuing the Start command it is necessary to give a negative digital pulse logical 1 O 1 to the SYN contact of the device The data acquisition begins right after negative pulse edge logical 1 to O arrives The duration of the SYN pulse i e of the logic O must be at least 50 ns The SYN line has an internal pull up resistor so one can just short the SYN line to ground to generate the required pulse owitching between start synchronization modes of data acquisition is software selectable QMBox20 User manual Rev 2 1 8 of 15 6 Connecting device The figure shows the rear panel of a QMBox20 device Link LED A USB Port Power Supply Port Link LED turns on when the device is connected to USB and signa
13. t time you should first insert the included CD into the CD ROM drive of your PC and only then connect the device to the PC via a USB cable As a rule having detected a new device Windows starts the Found New Hardware Wizard In this case you should follow its instructions choosing not to go to the Windows Update site and specifying the DRV folder on the included CD as the location of the driver Windows might not start the Found New Hardware Wizard automatically returning a driver error message in the notification area in the right bottom corner of the screen JM Device driver software was not successfully installed wx iiis Click here for details In this case you should start the Device Manager In different Windows OS versions the Device Manager is started differently For example in Windows 7 it can be started by right clicking the Computer icon then Properties and then Device Manager In the Device Manager QMBox device will appear as Unknown device You should right click on it and select Update Driver Software 5 cg IDE ATA ATAPI controllers p IEEE 1394 Bus host controllers pm Keyboards b Mice and other pointing devices b A Monitors b KY Network adapters 4 ff Ports CO Update Driver Software b IUE ESOS Disable Uninstall Scan for hardware changes Properties QMBox20 User manual Rev 2 1 10 of 15 After this the Found New Hardware Wizard will start up aay
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