WFS210 2CH WLAN DIGITAL STORAGE OSCILLOSCOPE WFS210 help manual for use with the PC & tablet © 2014 Velleman NV
Contents Table of Contents Foreword Part I Introduction 1 Part II General information 2 1 Specifications ................................................................................................................................... & Features 2 2 Safety ................................................................................................................................... & Warnings 3 3 Measuring .......................................................................................
Contents 19 14 - T................................................................................................................................... 15 - V................................................................................................................................... 19 16 - W...................................................................................................................................
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1 Introduction 1 Introduction WFS210 2CH wlan Digital Storage Oscilloscope The Velleman WFS210 is the world’s first Wlan dual channel digital 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, AndroidTM or PC (Windows) to display the measurements.
2 Introduction 2 General information 2.1 Specifications & Features Features two independent channels high sensitivity: up to 0.2mV full auto setup function signal markers hold function probe x1/X10 function DVM readouts fully documented protocol Li-ion rechargeable battery included Specifications input range: 5mV to 20V/div (12 steps) timebase: 1µs to 1s/div max.
3 General information 2.2 Safety & Warnings Safety & Warnings The maximum input voltage for the connections of the unit stands at 30Vp (AC+DC). Before making measurements and for safety reasons, it is important to know some information about the measured unit. Safe devices are: Battery operated equipment Equipment supplied via a transformer or adapter. Unsafe devices are: Equipment directly connected to mains (e.g.
4 2.3 General information 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 PROBE60S 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. IMPORTANT: X10 measuring probes should be calibrated.
5 General information 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.
6 Digital storage oscilloscope 3 Digital storage oscilloscope 3.1 Indications 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 level.
Digital storage oscilloscope 3.2 7 Connections Survey of the connections and controls: 1. 2. 3. 4. 5. 6. 3.3 BNC input connector channel 1 BNC inpuit connector channel 2 Power on/off USB/charger connection Reset SSID WLAN Probe compensation testpoint Charging the battery It is recommended to charge the battery completely before using the oscilloscope for the first time.
8 Digital storage oscilloscope 4 PC application 4.1 Overview 4.
9 PC application 4.3 Indications 1 1. 2. 3. 4. 5. 4.4 2 3 5 6 Connection status Frame rate Voltage/division measurement channel 1 Voltage/division measurement channel 2 Time base measurement Software controls Connect: Connect the software application with the WFS210 via USB or WLAN. Autorange: Automatic setup for the volts/div, time/div, and trigger level to produce a stable waveform of usable size. Time base: Selects the time setting for the beam to sweep one major division on the screen.
10 PC application 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.
PC application 4.5 Trigger level TRIGGER Level : Selects the signal level at which the sweep is triggered.
12 PC application 5 Tablet application 5.1 WFS210 application ios / Android™ Search for the WFS210 application.
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.
14 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.
Oscilloscope Terms 6 Oscilloscope Terms 6.1 -A- 15 ‘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).
16 Oscilloscope Terms 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. 6.
Oscilloscope Terms 17 DIVISION Imaginary or visible grid on the oscilloscope screen. It helps estimating signal amplitude and period. DSO The abbreviation for “Digital Storage Oscilloscope”. DUAL TRACE An oscilloscope having two traces to display channel 1 and channel 2 signals simultaneously. 6.5 -EEQUIVALENT 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.
18 Oscilloscope Terms INTERPOLATION A “connect–the–dots” processing technique to estimate what a fast waveform looks like based on only a few sampled points. 6.10 -NNOISE Undesired random addition to a signal. 6.11 -PPEAK-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.
Oscilloscope Terms 6.13 19 -SSAMPLING 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 second the digital oscilloscope ‘looks’ at the signal at the input.
20 Oscilloscope Terms 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). 6.16 -WWAVE The generic term for a pattern that repeats over time.
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