2CH wlan Digital Storage Oscilloscope
Contents
1. 62 B BANDWIDTH Usually expressed in MHz It is the frequency at which an applied sine wave will be displayed at an amplitude of around 70 of its original amplitude More expensive scopes feature a higher bandwidth Rule of thumb the bandwidth of an oscilloscope needs to be at least 5 times higher than the frequency of the signal applied to the input of the scope 63 C CHANNEL This is the input circuit consisting a vertical attenuator vertical amplifier and an input coupling network CIRCUIT LOADING The unintentional interaction of the probe and oscilloscope with the circuit being tested which distorts a signal 2014 Velleman NV EN Oscilloscope Terms 6 4 CLIPPING When the top or bottom or both extremes of a signal are cut off clipped e g because the signal cannot swing any further due to power supply limitations An undesired property of amplifiers that are driven beyond their specifications COMPENSATION A probe adjustment for X10 attenuator probes that balances the electrical properties of the probe with the electrical properties of the oscilloscope COUPLING The method of connecting two circuits together D DC COUPLING The oscilloscope displays both the AC and the DC component of a signal DC REFERENCE DC measurement is always performed with respect to a ground level so we need to define this ground level If you do not set the DC reference the readout might not be correct I2. An indication of how much the vertical amplifier can amplify a weak signal Vertical sensitivity is usually measured in millivolts mV per division VOLT The unit of electric potential difference 2014 Velleman NV EM Oscilloscope Terms 6 16 VOLTS DIV Determines how many volts the signal at the input must swing for the trace to move one division VRMS The rms voltage of an AC source represents the required DC voltage to generate the same amount of heat in a resistor as the AC source would do For sinusoidal signals Vrms Vpp sqrt 2 W WAVE The generic term for a pattern that repeats over time Common types include sine square rectangular saw tooth triangle step pulse periodic non periodic synchronous asynchronous WAVEFORM A graphic representation of a voltage varying over time WAVEFORM POINT A digital value that represents the voltage of a signal at a specific point in time 2014 Velleman NV Velleman Legen Heirweg 33 B 9890 GAVERE Belgium Europe Phone number 32 0 9 384 36 11 Fax Velleman 32 0 9 389 93 35 il i d d d web www vellemanprojects eu Copyright Velleman Misprinting and modifi cations in images and text reserved
3. for measuring oscilloscope traces GROUND A conducting connection by which an electric circuit or equipment is connected to the earth to establish and maintain a reference voltage level It s also the voltage reference point in a circuit H HERTZ HZ One cycle per second the unit of frequency INPUT COUPLING The drawing shows typical oscilloscope input circuit There are 3 possible settings AC coupling DC coupling and GND With AC coupling a capacitor is put in series with the input signal This capacitor blocks any DC component of the signal and passes only AC With DC coupling the capacitor is bypassed and both the AC and DC component of the signal are passed Low frequency Signals lt 20Hz should always be displayed using DC coupling Should AC coupling be used the internal coupling capacitor will interfere with the signal and the displayed signal will not be correct 2014 Velleman NV EN Oscilloscope Terms 6 10 6 11 6 12 INTERPOLATION A connect the dots processing technique to estimate what a fast waveform looks like based on only a few sampled points N NOISE Undesired random addition to a signal P PEAK TO PEAK Difference between most positive and most negative swing of the signal 2xVpeak Vpp for sinusoidal signals PERIOD T Duration of one cycle of the AC waveform 1 f PHASE Term used when referring to degree points of a signal s period POST TRIGGER DATA Data which oc
4. level Never use the WFS210 with a USB connection when the signal source is powered trough USB Battery full Battery charging 2014 Velleman NV Digital storage oscilloscope 3 2 Connections Survey of the connections and controls 1 BNC input connector channel 1 2 BNC inpuit connector channel 2 3 Power on off 4 USB charger connection 5 Reset SSID WLAN 6 Probe compensation testpoint 3 3 Charging the battery CHARGER WITH USB OUTPUT Velleman part PSSEUSB8 velleman eu 5V 1A 5W It is recommended to charge the battery completely before using the oscilloscope for the first time 2014 Velleman NV 8 Digital storage oscilloscope 4 PC application 4 1 Overview Multiplication Readout set up Coupling volts division Menu options Channel1 Connect 1 USB Wifi Demo Auto setup Timebase Trigger options Trigger level channel 1 Trigger level channel 2 Channel 2 oo Framerate V div measurement channel 2 4 2 Menu options File Tools Help File menu Connect Connect the software application htrough USB or WLAN with the scope module Exit Terminates the program Tools menu WLAN settings gt SSID Change the name of the WLAN network E Wifi C a nfi q U rati on k Configuration settings SSID wFSz10 Channel 3 Cancel Help menu About Displays information
5. WFS210 2CH WLAN DIGITAL STORAGE OSCILLOSCOPE WFS210 help manual for use with the PC amp tablet 2014 Velleman NV Table of Contents Part I Part Il Part Il 1 2 3 Part IV oa Ff N Part V 1 WFS210 application scscvescsectececcsaccetsanstzcscuntataccceetcasedenstans 2 Measuring with Apple Android 3 Gestures for tablet oiii oorr bore c Deep Eu E cepas eres rece vcves Part VI O AN Oo C BR N mh 4 QO N Foreword Introduction General information Specifications amp Features ss Safety amp Wa FnindS 2 5 8585 585 sense siens tente ennui Measurind PEIODO isse uud secuta nds anra Probe COMPENSATION 2 eon rrerieia usc on nn ao suoi ak ea ERR ERR cR UENUe Sir US Digital storage oscilloscope Indications EE ne i ume cue ULM eee Cornnecllons 2 E E EEEE E E SEAE E EE en ee Charging the battery sis sen ce ren diese PC application OVEN VIC e EE Menu ODWONS esie nn a tenus INGICATIONS eee c t Software controls esee ene nennen nnn LE DS Le CAM 16 VON ec Tablet application Oscilloscope Terms Contents 2014 Velleman NV Contents 2014 Velleman NV Company profile by Velleman NV FTO TEE I i a LH eee om Velleman nv has been an important wholesaler and developer of electronics for over 36 years Our warehouses contain more than 18 000 different products of 50 brands The distrib
6. about the program version 2014 Velleman NV PC application 4 3 Indications Connected CH1 0 00mV CH2 0 00mV Ous IMFHz 1 2 3 5 6 Connection status Frame rate Voltage division measurement channel 1 Voltage division measurement channel 2 Time base measurement eu o I 4 4 Software controls Connect Connect the software application with the WFS210 wa USB or WLAN M Autorange Automatic setup for the volts div time div and trigger level to produce a stable waveform of usable size lt 500ps gt Time base Selects the time setting for the beam to sweep one major division on the screen By selecting different time div settings it is possible to zoom in on the frozen waveform on the screen Trigger options O NORMAL TRIGGER Channel Selects the trigger source signal CH1 CH2 or EXT ONCE RUN TRIGGER Edge Selects the triggering slope e Arrow up the signal will only appear when a rising slope is detected i e the input voltage is lower than the trigger level and exceeds the trigger level e Arrow down the signal will only appear when a falling slope is detected i e the input voltage is higher than the trigger level and must descend under the trigger level Normal A triggering must occur before the sample memory is filled Use this mode when you want to start displaying the signal when it reaches a preset threshold value Once When the trigger level is reached the signal will be sampled a
7. comparing the voltage with a number of levels The resulting number is the number of the highest level that s still lower than the voltage The number of levels is determined by the resolution The higher the resolution the more levels are available and the more accurate the input signal can be reconstructed DISTORTION Undesired alteration of a signal due to external causes such as overloaded circuits badly designed circuits etc 2014 Velleman NV 6 5 6 6 6 7 6 8 6 9 Oscilloscope Terms DIVISION Imaginary or visible grid on the oscilloscope screen It helps estimating signal amplitude and period DSO The abbrevation for Digital Storage Oscilloscope DUAL TRACE An oscilloscope having two traces to display channel 1 and channel 2 signals simultaneously E EQUIVALENT TIME SAMPLING An equivalent time sampling oscilloscope sometimes simply called a sampling scope measures only the instantaneous amplitude of the waveform at the sampling instant In contrast to the real time scope the input signal is only sampled once per trigger EARTH GROUND A conductor that connects electrical currents to the Earth F FALLTIME The time required for a signal to fall from 9096 of the peak value to 1096 of the maximum value of the amplitude This excludes overshoot and undershoot from measurement FREQUENCY F The number cycles of the AC waveform per sec Ge GRATICULE The grid lines on a screen
8. compensation networks An uncompensated probe can lead to various measurement errors especially in measuring pulse rise or fall times To avoid such errors always compensate probes right after connecting them to the oscilloscope and check compensation frequently If your probe has a compensation network you should adjust this network to compensate the probe for the oscilloscope channel that you are using To do this use the following procedure 1 Attach the probe to the oscilloscope 2 Attach the probe tip to the probe compensation testpoint on the oscilloscope s 3 Check the shape of the displayed waveform OK NOT OK NOT OK 4 Use the adjustment tool provided with the probe or other non magnetic adjustment tool to adjust the compensation network to obtain a calibration waveform display that has flat tops with no overshoot or rounding 5 Ifthe oscilloscope has a built in calibration routine run this routine for increased accuracy 6 Repeat as necessary 2014 Velleman NV Digital storage oscilloscope 3 Digital storage oscilloscope 3 1 Indications gt pa NAN Hotspot creates it s own wireless local area network WLAN Sending signals when the connection is successful with the tablet PC App connection indicates when there is connection over the WLAN network with the tablet PC application Power on off USB Charger connected Caution Probe ground and charger ground at different voltage
9. coupling Vrms Tues Vmin The signal s negative peak voltage difference between zero and lowest abes value is displayed dBm Vmax The signal s positive peak voltage difference between zero and highest value is displayed dBgain Wrms2 Wrms Vpp The signal s peak to peak voltage difference between highest and lowest Wims value is displayed Wrms1 Vrms The true RMS value of the AC wave is calculated and converted to Wrms32 voltage Vtrms The true RMS value of the wave AC DC is calculated and converted to voltage dBm The measured signal AC only is converted to dBm OdB 0 775V dBgain The gain between channels 1 and 2 Channel 1 input signal Channel 2 output signal Wrms2 Wrms4 Wrms8 Wrms16 Wrms32 The measured voltage is converted into power supposing that the voltage is measured across an impedance The calculated power can be displayed for loads of 2 4 8 16 or 32 Ohm To choose the different loads first highlight the power readout and then press the right cursor key 2014 Velleman NV PC application 4 5 Trigger level Velleman WFS210 2CH WiFi Digital Storage Oscilloscope File Tools Help AC DC GND X10 lt 10 Connect AUTO RANGE 500ps gt NORMAL ONCE RUN HOLD Calibrate oo ac OC ND x10 10 gt 439 36mv Vde Connec ted 60 fps CHI 0 00mV CH2 0 00mV Ous INFHz TRIGGER Level Selects the signal level at which the sweep is triggere
10. curred after the event that caused a digital storage oscilloscope to trigger PRE TRIGGER DATA Data which occurred before the event that caused a digital storage oscilloscope to trigger PROBE An oscilloscope input device usually having a pointed metal tip for making electrical contact with a circuit element a lead to connect to the circuit s ground reference and a flexible cable for transmitting the signal and ground to the oscilloscope They are designed not to influence the behavior of the circuit you are testing PULSE A common waveform shape that has a rising edge a width and a falling edge R REAL TIME SAMPLING A sampling mode in which the oscilloscope collects as many samples as possible from one triggered acquisition Ideal for signals whose frequency range is less than half the oscilloscope s maximum sample rate RIPPLE Unwanted periodic variation of a DC voltage RISE TIME The time taken for the leading edge of a pulse to rise from its low to its high values typically measured from 10 to 90 2014 Velleman NV Oscilloscope Terms EN 6 13 S SAMPLING Sampling is the reduction of a continuous signal to a discrete signal Every time the scope samples an input waveform it memorizes the voltage value at that instant and converts it to a binary number which can be stored in memory SAMPLING RATE Usually expressed in samples or mega samples second sometimes in MHz It is the number of times per s
11. d 2014 Velleman NV EN PC application Tablet application WFS210 application ios Android Available on the ANDROID APP ON Ld App Store P Google play Search for the WFS210 application 2014 Velleman NV Tablet application 5 2 Measuring with Apple Android 1 Power on the WFS210 oscilloscope 2 Slow blinking creation of an access point successful 3 Connect your tablet with the WLAN access point iPad gt 11 51 5590 Settings Wi Fi Airplane Mode Wi Fi O WiFi WFS210 v WFS210 Bluetooth Cellular Data CHOOSE A NETWORK Eminent i Carrier Velleman a i Warehouse a i re y amp Notification Center Other e Control Center Do Not Disturb G Ask to Join Networks Known networks will be joined automatically If no known networks are available you will have to ade manually select a network fi General Ras Wallpapers amp Brightness Sounds O Passcode J Privacy Velleman Connected Eminent Saved WFS210 Saved Warehouse Secured with WEP AndroidAP6162 Not in range Android 2014 Velleman NV NM Tablet application 4 Connect the Oscilloscope to a signal source 5 Tap on the WFS210 app to open it 6 The LED lights when the applications have been successfully connected to the WFS210 scope 7 The scope is now ready for use 5 3 Gestures for tablet 2014 Velleman NV O
12. econd the digital oscilloscope looks at the signal at the input The more it looks the better it is able to recreate a faithful image of the waveform on the screen Theoretically the sample rate needs to be twice the max frequency of the applied signal however for best results a sample rate of 5 times the max frequency is recommended SENSITIVITY Indicates the smallest change of the input signal that makes the trace move up or down on the screen Usually expressed in mV SIGNAL Voltage applied to the input of the oscilloscope The subject of your measurement SINE WAVE Mathematical function that represents a smooth repetitive oscillation The waveform shown at the start of this glossary is a sine wave SLOPE It determines where the scope will trigger This can be on the rising or on the falling slope of the signal SPIKES Fast short duration transients in a signal 6 14 T TIME BASE TIME DIVISION Determines the time the trace needs to scan from the the left hand side to the right hand side of a division The time base is calibrated in time div and usually measured in seconds divsion TRACE A line that is drawn on the screen which represents the signal at the input TRIGGER It defines when a signal is acquired and stored in memory Digital storage oscilloscopes can provide pretrigger viewing they constantly process the input signal whether a trigger has been received or not 6 15 V VERTICAL SENSITIVITY
13. ital storage oscilloscope geared towards tablet computers it s a compACt portable battery powered fully featured two channel oscilloscope As opposed to traditional oscilloscopes it does not feature a screen Instead of a built in screen it uses your tablet iOS Android or PC Windows to display the measurements Data exchange between the tablet and the oscilloscope is va Wlan there are no cables The idea behind the concept is that almost every hobbyist student or engineer owns a tablet so why pay more for an oscilloscope with a built in screen if you can use your tablet Also as there is no physical connection between the oscilloscope and the tablet it is a very safe instrument to use Due to the wireless principle the oscilloscope and the screen do not need to be at the same location Regular oscilloscopes are usually button pACked and complex to use Not this one All controls are performed by means of gestures you normally use with tablets such as swiping pinching etc It is also very easy to take screenshots The communication protocol between the oscilloscope and the tablet is freely available so it is easy for third party developers to develop applications for other purposes Finally it is equipped with a USB port for charging of the internal battery When fully charged it runs up to 10 hours continuously If desired it can also connect to a PC wa the USB port instead of wireless 2014 Velleman NV Introductio
14. n General information Specifications amp Features Features e two independent channels e high sensitivity up to 0 2mV e full auto setup function e signal markers e hold function e probe x1 X10 function e DVM readouts e fully documented protocol e Li ion rechargeable battery included Specifications input range 5mV to 20V div 12 steps timebase 1us to 1s div max 30Vpp input bandwidth 2 x 10MHz 3dB at selected ranges real time sample rate 2 x 10MS s input impedance 1Mohm input coupling AC DC and GND AD resolution 8 bit sample buffer 4K channel readouts Vdc Vmin Vmax Vpp Vrms Vtrms dBm dBgain Wrms2 Wrms4 Wrms8 Wrms16 Wrms32 power consumption battery 160mA max battery Li ion 3 7V 1800mAh USB charge current 5V 500mA max weight 180g 0 39lb dimensions 100 x 100 x 35mm 3 9 x 3 9 x 1 4 Minimum system requirements ae iOS Android 4 0 Windows XP or higher Tablet or PC iOS is a trademark or registered trademark of Cisco in the U S and other countries and is used under license 3 Android is a trademark of Google Inc 3 Windows is a registered trademark of Microsoft Corporation in the United States and other countries 2014 Velleman NV General information 2 2 Safety amp Warnings Safety amp Warnings he maximum input voltage for the connections of the unit stands at 30Vp AC DC Before making measurements and f
15. n most cases this ground level will be the center of the screen however this is not mandatory DC VOLTAGE DC With DC the current flows in a single direction it does not reverse A DC source has a polarity and DECIBEL DB The decibel dB is a logarithmic unit used to express the ratio between two values of a physical quantity usually measured in units of power or intensity One of these quantities is often a reference value and in this case the dB can be used to express the absolute level of the physical quantity The decibel is also commonly used as a measure of gain or attenuation the ratio of input and output powers of a system or of individual factors that contribute to such ratios The number of decibels is ten times the logarithm to base 10 of the ratio of the two power quantities DIGITAL Digital scopes perform an analog to digital conversion on the incoming signal and handle all the calculations and displaying in the digital domain Digital signals feature only two fixed levels usually OV and 5V DIGITAL STORAGE OSCILLOSCOPE A digital storage oscilloscope is an oscilloscope which stores and analyses the signal digitally rather than using analogue techniques Digital oscilloscopes usually analyze waveforms and provide numerical values as well as visual displays DIGITIZE Converting an analog signal to digital When digitizing the samples the voltage at each sample time is converted to a number This is done by
16. nd held onto the display This function is very interesting for detecting e g a short once only voltage peak Run The scope automatically triggers if no triggering occurs for a fixed period of time Ideal for measuring DC voltages Hold the latest information in memory releasing the hold button restarts the scope sampling lIt may be useful the freeze certain signals in order to study them or to perform measurements using markers Calibrate the scope Make sur all probes are disconnected prior to calibration 2014 Velleman NV PC application AC DC GND Coupling AC the input signal is capacitively coupled to the input amplifier attenuator Only the AC components are measured GND the input signal is broken and the input amplifier attenuator is connected to earth Use this position for selecting a reference point on the display DC the input signal is directly connected to the input amplifier attenuator Both AC and DC voltage are measured X10 When measuring high voltages set the measuring probe and the oscilloscope in the X10 position volts div The signal on the screen can be enlarged or reduced vertically by adjusting the displayed voltage per division V div voltage per division Readout set up Press the button to call the menu A table with all possible readout setups Vmin appears Select the desired readout E Vdc This functon enables the user measure DC voltages Vpp only for DC input
17. or safety reasons it is important to know some information about the measured unit Safe devices are e Battery operated equipment e Equipment supplied via a transformer or adapter Unsafe devices are e Equipment directly connected to mains e g old TV sets e Equipment that contains components that are directly connected to mains dimmers e t is advisable when measuring on above equipment to use a isolation transformer 2014 Velleman NV a General information 2 3 Measuring Probe We advise the user to use a measuring probe equipped with a X10 setting when high or unknown voltages or high impedances need to be measured e g our PROBEOO0S type When using the measuring probe in the X10 position the measuring impedance will increase to 10Mohm thereby reducing the measuring instrument s charge on the coupling IMPORT ANT X10 measuring probes should be calibrated 2014 Velleman NV General information EM 2 3 1 Probe compensation Perform this adjustment to match your probe to the input channel This should be done whenever you attach a probe for the first time to any input channel Most probes are designed to match the inputs of specific oscilloscope models However there are slight variations from oscilloscope to oscilloscope and even between different input channels in the same oscilloscope To deal with this where necessary many probes especially attenuating probes X10 and X100 probes have built in
18. scilloscope Terms BETE 6 Oscilloscope Terms 61 A AUTO SETUP MODE The oscilloscope automatically selects a setting for volts div and time div in such a way that one or more periods of signal are displayed correctly AC COUPLING The oscilloscope only displays the AC component of a signal any DC level is ignored ACCELERATING VOLTAGE Tthe internal voltage that accelerates the electron beam and causes trace illumination on the oscilloscope display Usually measured in kilovolts kV ALIASING In signal processing aliasing refers to an effect that causes different signals to become indistinguishable when sampled It also refers to the distortion or artifact that results when the signal reconstructed from samples is different from the original continuous signal Aliasing can occur in signals sampled in time for instance digital audio and is referred to as temporal aliasing AMPLITUDE How far does the signal swing in a direction Expressed in mV or V For repetitive signals Vpeak Vpp ANALOG Analog scopes use the incoming signal to deflect an electron beam which scans from left to right on the screen The electron beam leaves an image on the screen which represents the signal you ve applied Analog signals are continuously variable ATTENUATION A decrease in signal amplitude measured in decibels dB AVERAGING MODE A processing technique used by digital oscilloscopes to eliminate noise in a displayed signal
19. ution network includes more than 1700 distributors in well over 85 countries Velleman nv has built up an excellent service reputation towards retailers To meet the ever increasing growth Velleman amp nv expanded with new offices and showrooms as well as a new warehouse of 35 000m equipped with the latest in order picking technology This represents an investment of over 5 500 000 Our company e own research amp development department with over 30 years of technical knowledge e sales to do it yourself shops and mass distribution of the Perel brand e sales to electronics stores export department common industrial products department e present at electronics fairs all over the world kits production within the company sales offices in Spain France the Netherlands Sweden Poland and Belgium e sales office and warehouse of 20 000 ft in the United States e warehouse 15 000m e Velleman purchase office in China Hong Kong and Taiwan service and repair department for technical assistance and repairs e quality control of each purchased product e a high degree of automation and computerization thanks to our IT department e own graphical department for design of packaging and catalogs and the preparation an translation of user manuals different showrooms per division Introduction 1 Introduction WFS210 2CH wlan Digital Storage Oscilloscope The Velleman WFS210 is the world s first Wlan dual channel dig
Download Pdf Manuals
Related Search