Measurement Computing USB-2020 Скачать руководство пользователя страница 17 | Manualshive

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Measurement Computing USB-2020 Скачать руководство пользователя страница 17

USB-2020 User's Guide

Functional Details

Each configuration is explained below:



High or low level

−

Trigger or gate an acquisition when an input signal is higher or lower than the specified

voltage.



Rising or falling edge

−

Trigger an acquisition when input signals cross a specified voltage (rising or

falling)



Window

−

Gate an acquisition when the input signal is within or outside two specified voltages (in/out of

window)



Hysteresis

−

After the input signal has passed through one specified voltage, trigger an acquisition when

the input signal passes through a second voltage (positive or negative). For example, once the signal goes

below 5 V, a rising edge that crosses 4 V must occur to trigger an acquisition.

Mechanical drawing

Figure 8. USB-2020 board dimensions

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Содержание USB-2020

Страница 1: ...USB 2020 12 bit Ultra High Speed USB Device User s Guide Document Revision 2 February 2015 Copyright 2015 ...

Страница 2: ...anties are in lieu of all other warranties expressed or implied including any implied warranty of merchantability or fitness for a particular application The remedies provided herein are the buyer s sole and exclusive remedies Neither Measurement Computing Corporation nor its employees shall be liable for any direct or indirect special incidental or consequential damage arising from the use of its...

Страница 3: ...hardware 9 Connecting the board for I O operations 9 Connectors cables and accessory products 9 Cabling 10 Field wiring signal termination and conditioning 10 Chapter 3 Functional Details 11 Analog input acquisition modes 11 Software paced 11 Continuous scan hardware paced 11 BURSTIO 11 Connectors and LEDs 12 BNC connectors 12 Status LEDs 12 USB connector 12 External power connector 12 40 pin auxi...

Страница 4: ...USB 2020 User s Guide External clock input output 21 Memory 21 Power 22 Environmental 22 Mechanical 22 USB 22 Signal I O connectors 23 BNC connectors 23 Auxiliary connector 23 4 ...

Страница 5: ...rs damaging your hardware or losing your data bold text Bold text is used for the names of objects on a screen such as buttons text boxes and check boxes italic text Italic text is used for the names of manuals and help topic titles and to emphasize a word or phrase Where to find more information Additional information about the USB 2020 is available on our website at www mccdaq com You can also c...

Страница 6: ...taneous sampling o 1 A D per channel o 12 bit resolution o 10 V 5 V 2 V 1 V voltage ranges software selectable o 17 MHz input bandwidth 64 megasample onboard memory o 40 MS s overall rate to onboard memory when acquiring from both channels 20 MS s per channel o 8 MS s throughput to host computer Analog and digital triggering level and edge Analog and digital gating Eight digital I O lines Internal...

Страница 7: ... care while handling to avoid damage from static electricity Before removing the USB 2020 from its packaging ground yourself using a wrist strap or by simply touching the computer chassis or other grounded object to eliminate any stored static charge If your USB 2020 arrives already damaged notify Measurement Computing Corporation immediately by phone fax or email Knowledgebase kb mccdaq com Phone...

Страница 8: ...th the USB 2020 has a higher gauge wire 24 AWG minimum VBUS GND 28 AWG minimum D D than generic USB cables and is required for proper enumeration of the USB 2020 4 Connect the other end of the USB cable to a USB port on your computer or to an external USB hub that is connected to your computer The bottom USB Activity LED turns on The USB cable only provides communication to the USB 2020 If you are...

Страница 9: ... run time the calibration factors are loaded into system memory and are automatically retrieved each time a different ADC range is specified A full calibration typically takes less than two minutes Before you calibrate the device turn your computer on and allow at least 30 minutes for the surrounding temperature to stabilize For best results calibrate the device immediately before making critical ...

Страница 10: ...sal screw terminal board to terminate field signals and route them into the USB 2020 using the C40FF x cable You can use the following MCC screw terminal boards to terminate field signals and route them into the USB 2020 using the C40 37F x cable directly CIO MINI37 37 pin universal screw terminal board SCB 37 37 conductor shielded signal connection screw terminal box The red stripe identifies pin...

Страница 11: ...ate in continuous scan mode is 8 MS s for all acquired data one channel or two channels The maximum rate achieved depends on the host computer BURSTIO When using BURSTIO the USB 2020 can acquire data at the maximum rate of 20 MS s per channel to the internal memory buffer up to 64 megasamples 1 The acquired data is read from the FIFO and transferred to a user buffer in the computer You can initiat...

Страница 12: ... ended analog inputs One external digital trigger input One clock input output The external digital trigger input signal is also available on the 40 pin IDC connector Status LEDs The Device Ready LED turns on after the device is enumerated by the system and is associated with a hardware driver The USB Activity LED turns on when the USB 2020 is transmitting or receiving data USB connector The USB c...

Страница 13: ...Ground GND 3 4 N C Do not connect Digital I O bit 7 DIO7 5 6 N C Do not connect Digital I O bit 6 DIO6 7 8 N C Do not connect Digital I O bit 5 DIO5 9 10 TRIG IN External digital trigger input Digital I O bit 4 DIO4 11 12 GND Ground Digital I O bit 3 DIO3 13 14 GND Ground Digital I O bit 2 DIO2 15 16 GND Ground Digital I O bit 1 DIO1 17 18 GND Ground Digital I O bit 0 DIO0 19 20 GND Ground Ground ...

Страница 14: ...0 GND 29 GND 21 GND 11 GND 22 N C 30 N C 23 N C 12 N C 24 N C 31 N C 25 GND 13 GND 26 N C 32 N C 27 N C 14 N C 28 N C 33 N C 29 GND 15 GND 30 N C 34 N C 31 N C 16 N C 32 N C 35 N C 33 GND 17 GND 34 N C 36 N C 35 VO 18 VO 36 N C 37 N C 37 GND 19 GND 38 N C 39 N C 40 N C Signal connections Analog input The USB 2020 has two single ended simultaneous sampling analog inputs that provide sampling at rat...

Страница 15: ...O BNC connector External clock I O USB 2020 analog input scanning operations can be paced with the internal A D clock or with an external clock source The CLK IO connector can be configured through software for input default for external pacing or for output to pace a connected device Digital I O You can connect up to eight digital I O lines to DIO0 through DIO7 on the 40 pin IDC connector When a ...

Страница 16: ...IG IN BNC connector and the TRIG IN IDC pin are external digital trigger gate inputs that you can configure through software An analog scan can have a trigger or a gate but not both For example you cannot use an analog trigger and use the TRIG IN BNC connector to gate at the same time A trigger or gate can be digital or analog Digital triggers can be configured for rising or falling edge or for hi...

Страница 17: ...d voltage rising or falling Window Gate an acquisition when the input signal is within or outside two specified voltages in out of window Hysteresis After the input signal has passed through one specified voltage trigger an acquisition when the input signal passes through a second voltage positive or negative For example once the signal goes below 5 V a rising edge that crosses 4 V must occur to t...

Страница 18: ...ce 1 5 MΩ typ Input leakage current 2 uA typ 10 uA max Input bandwidth 3 db All input ranges 17 MHz typ Crosstalk DC to 10 kHz 90 dB Trigger source Digital TRIG IN BNC connector and 40 pin connector See External trigger for more information Analog CH0 or CH1 Sample clock source Internal 1 kHz to 20 MHz max External CLK IO BNC connector See External clock input output for more information Throughpu...

Страница 19: ...64 0 0035 25 Noise performance For the peak to peak noise distribution test a single ended input channel is connected to AGND at the input BNC connector and 20 000 data samples are acquired at the maximum rate Table 3 Noise performance specifications Range Counts LSBrms 10 V 5 0 76 5 V 5 0 76 2 V 7 1 06 1 V 7 1 06 Analog input calibration Table 4 Analog input calibration specifications Parameter S...

Страница 20: ...d 33 S s to 4 000 S s typ system dependent Input high voltage 2 0 V min Input low voltage 0 8 V max Output characteristics 47 kΩ pull up open drain DMOS transistor source connected to ground Output voltage range 0 V to 5 V using 47 KΩ internal pull up resistors 0 V to 15 V max through optional user supplied external pull up resistors Note 1 Drain to source breakdown voltage 42 5 V min Note 2 Off s...

Страница 21: ...8 V max External clock input output Table 7 External clock I O specifications Parameter Specification Terminal name CLK IO BNC connector Terminal type ADC clock input output software selectable for input or output default is input Terminal description When configured for input receives sampling clock from external source When configured for output outputs the internal sampling clock Clock rate 1 k...

Страница 22: ...ludes up to 10 mA for the Status LED This value does not include potential loading of the DIO bits or the VO pin Environmental Table 10 Environmental specifications Parameter Specification Operating temperature range 0 C to 50 C max Storage temperature range 40 C to 85 C max Humidity 0 to 90 non condensing max Mechanical Table 11 Mechanical specifications Parameter Specification Dimensions L W H 1...

Страница 23: ... Table 15 40 pin connector J9 pinout Pin Signal name Pin description Pin Signal name Pin description 1 GND Ground 2 VO Power output 3 GND Ground 4 N C Do not connect 5 DIO7 Digital I O bit 7 6 N C Do not connect 7 DIO6 Digital I O bit 6 8 N C Do not connect 9 DIO5 Digital I O bit 5 10 TRIG IN External digital trigger input 11 DIO4 Digital I O bit 4 12 GND Ground 13 DIO3 Digital I O bit 3 14 GND Gr...

Страница 24: ...Measurement Computing Corporation 10 Commerce Way Suite 1008 Norton Massachusetts 02766 508 946 5100 Fax 508 946 9500 E mail info mccdaq com www mccdaq com ...

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