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ELAN DIGITAL SYSTEMS USBscope50, User Manual

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ELAN DIGITAL SYSTEMS USBscope50 User Manual Download Page 7

2.2 USBscope50 Architecture

The figure below shows a simplified diagram of the USBscope50.

ATTENUATOR

1Meg

CONTROLLER

STACK

CONN

AC/DC

BNC

AMP

COMP

PSU

DATA

USB

CONTROLLER

USB

Trigger

ISOLATION BARRIER

8-BIT ADC

Figure 2.2-1 USBscope50 Architecture Diagram

Elan Digital Systems Ltd.

7 

USBscope50 USER’S GUIDE Iss8

Summary of Contents for USBscope50

Page 1: ...owledged The USBscope50 is Patent Pending REVISION HISTORY ISSUE PAGES DATE NOTES 1 30 04 07 2005 FIRST ISSUE 2 30 08 07 2005 Various additional info spec amendments 3 31 15 07 2005 Add support for Wi...

Page 2: ...3 2 2 Software For Non Stacked Configurations 14 2 4 Input Ranges 15 2 4 1 Offset Nulling 16 2 5 Probe Compensation 16 2 6 Acquisition Modes 20 2 6 1 Single Shot 20 2 6 2 Random Interleaved Sampling...

Page 3: ...Power Requirements 31 4 2 Mechanical 31 4 3 Environmental 31 4 4 Performance 32 4 4 1 Safety Data and Maximum Ratings 32 4 4 2 Static Performance 33 4 4 3 Dynamic Performance 34 4 4 4 Miscellaneous 34...

Page 4: ...is equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However ther...

Page 5: ...V div 300mV div 3V div and with x10 probe are 300mV div 3V div 30V div Input ranges provided by the software from 2mV Div to 10V Div in 1 2 5 steps 1Meg input impedance 16pF Channel offset control Har...

Page 6: ...can be used as an independent single channel scope but to enhance flexibility several USBscope50s can be stacked together to make a combined 2 3 or 4 channel device In this case each scope is synchro...

Page 7: ...plified diagram of the USBscope50 ATTENUATOR 1Meg CONTROLLER STACK CONN AC DC BNC AMP COMP PSU DATA USB CONTROLLER USB Trigger ISOLATION BARRIER 8 BIT ADC Figure 2 2 1 USBscope50 Architecture Diagram...

Page 8: ...are connected to a USB port Before you begin put the short lead connectors to one side you ll only need one of these Now insert one of the long connectors from the top of one of the scopes it doesn t...

Page 9: ...inside the scope s case This scope MUST be the bottom scope in the stack The reason for this is that if you use the long connector the pins could be shorted out accidentally or you may touch the pins...

Page 10: ...heck that as you pushed the 2nd scope down the stack connector has not been forced upward if it has simply press it down until it seats correctly see picture above for a guide as to the normal exposed...

Page 11: ...rations When you run USBscope50 it will automatically detect the scopes connected via USB and will also check to see if the scopes are electrically connected together via the stack It will then initia...

Page 12: ...ead before connecting and disconnecting scopes from the stack Don t remove any scopes from the stack while the software is running Don t remove any scopes from the stack while any of them are powered...

Page 13: ...o termed Multi Independent Scope mode or MIS mode In MIS mode each scope can use its own timebase setting and each scope input will remain electrically isolated from the others unless you connect thei...

Page 14: ...ized USBscope50s For example if you want to run 2 scopes in MIS mode plug in one USBscope50 and then run USBscope50 Software Confirm that channel 1 is detected and running Insert the second USBscope50...

Page 15: ...t in nominal full scale input ranges The bandwidth of x1 scope probes is generally quite low 10 s of MHz and the circuit being measured will see a 1MegOhm load A x10 probe causes a factor of ten signa...

Page 16: ...e the software is installed Note that there is no difference from a hardware perspective whether you do this with the channel tab set to x1 or x10 coupling they use the same ranges in the hardware The...

Page 17: ...ype probe lists an adjustment range of 9 17pF and our tests show that whilst it is easy to compensate this probe against the USBscope50 the trimmer in the probe body is certainly quite close to the to...

Page 18: ...ed to connect the ground clip to either the BNC ground or use the GND pad near the compensation output11 to achieve a clean waveform with minimal mains hum 11 Be careful not to short circuit the GND p...

Page 19: ...ll amount of overshoot will mean that the scope will tend to slightly amplify high frequency signal components A typical trace after compensation will look like this Some deviation from this is normal...

Page 20: ...a very jagged and triangular looking waveform when observing a 10MHz input Drop the input frequency down to say 1MHz and you will see a nice smooth waveform In single shot mode the timebase can be se...

Page 21: ...he display Because each sweep happens at a random time with respect to the input waveform the relative times measured for each sweep are also random So it can take a few seconds for the picture of the...

Page 22: ...the screen over time Please note that in RIS mode it is not possible to observe the probe compensation output This is because it is precisely phase locked to the ADC s clock hence there is no way to t...

Page 23: ...ode will cause the waveform on the screen to lock to an edge and so appear fixed in time It is useful for observing regular waveforms or for doing a single triggered acquisition If no suitable wavefor...

Page 24: ...ave Graph 2 10 2 Export Graph Data USBscope50 Software displays 3000 data points on the graph By Exporting Graph Data you can save all these points in a txt file Select Edit Export Graph Data and Save...

Page 25: ...ument contains the header that defines the acquisition mode used USBscope50 Software loaded this file with the 3000 graph points Use software option Edit Import to recreate the graph DATA ON CHANNEL 2...

Page 26: ...TA On CHANNEL When you select a text file to import software will scan through it and will warn you if any of the header settings are missing and also will point out the line number where error encoun...

Page 27: ...u should get some additional help pages on how to use the software and also detailed information on SDK for USBscope50 Sources of the Software as well as driver sources are made available for you to d...

Page 28: ...n be used if needed During installation hardware device is detected USBscope50 15 After installation the device manager will look like this16 14 Include Language variants using the DBCS character mapp...

Page 29: ...pulse100 These devices all use SiLabs driver cp2101 c which is included in the kernel When you plug Elan USB device if driver is loaded the red led on the device will come on If LED is off it is most...

Page 30: ...ope50Software jar 3 3 Troubleshooting Check that the scope hardware installed properly Use the device manager as shown above and check that there are no yellow exclamation marks on USBscope50 device I...

Page 31: ...x 30 6 x 17 519 4 3 Environmental Humidity 80 non condensing General Operating Temperature 10 C to 45 C Ambient Specific Operating Temperature 22 C 3 C for rated accuracy Full Warm Up Time 10mins for...

Page 32: ...lete insulation Never allow any conductive part of any test lead to contact the host computer ground Doing so will bypass the safety isolation in the USBscope50 and could cause a lethal hazard Remembe...

Page 33: ...ring Up to 100 of buffer depth Triggering Normal rising edge falling edge greater less Trigger delay From 0 to 65535 sample periods Trigger range 100 of range approx 7bit resolution 21 This figure der...

Page 34: ...te max source sink current 1 mA 4 4 4 Miscellaneous USB transfer rate USB 2 027 Full Speed 12MBits sec USB device ID 10C4 F001 4 4 5 Software USBscope50 support XP Vista Recommended system Pentium Cla...

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