Velleman PCSU1000 User Manual

DSO

USERMANUAL

PCSU1000

PC Oscilloscope PCSU1000I

Table of Contents

Part I

Part II

Foreword

Contents

................................................................................................................................... 21 Safety Instructions

................................................................................................................................... 32 1GS/s oversampling mode

................................................................................................................................... 33 Controls

................................................................................................................................... 54 Connection

................................................................................................................................... 65 Troubleshooting

................................................................................................................................... 66 Waveform Parameters Display

................................................................................................................................... 97 Add comment text in the signal screen

Menu Options

................................................................................................................................... 91 File Menu

................................................................................................................................... 102 Edit Menu

................................................................................................................................... 103 Options Menu

................................................................................................................................... 124 View Menu

................................................................................................................................... 145 Spectral Density

................................................................................................................................... 166 Math Menu

................................................................................................................................... 167 Help Menu

Part III

Data Transfer

................................................................................................................................... 161 Data acquisition to other applications

................................................................................................................................... 202 Data acquisition to Microsoft Excel

Index 0

1 Contents

Operation Instructions for Velleman PC Oscilloscope

PCSU1000

DIGITAL STORAGE PC OSCILLOSCOPE

FFT SPECTRUM ANALYZER

Safety Instructions

1GS/s sampling mode

Controls

Connection

Waveform Parameters Display

Troubleshooting

Adding comment text in the signal screen

Menu Options

Spectral Density marker

Data acquisition to other applications

Data acquisition to Microsoft Excel

SAFETY and WARNINGS

Important safety information, see user manual.

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.

Do not measure:

Equipment directly connected to mains.

Equipment that contains components that are directly connected to mains (dimmers…).

necessary to

measur

above mentioned equipment, use an isolation transformer.

Please remember that the ground

of both channels are interconnected and connected to the

PC ground !

Contents 2

1.1 Safety Instructions

PC Oscilloscope PCSU10003

The 1GS/s sampling rate is in use on blue 0.2us/div, 0.1us/div, 0.05us/div and 0.02us/div

ranges.

Triggering must be ON to get stable waveform images.

This mode is useable only for repetitive signals.

This operation mode is called "Random Interleaved Sampling" (RIS) method, sometimes also

called "Equivalwent Time Sampling" (ET) mode or "Random Repetitive Sampling". In this

sampling mode the oscilloscope uses successive triggering occurrences to gather the data to

construct a picture of a repetitive signal.

Spectrum analyzer mode

FREQ. RANGE

Sets the frequency range of the display. It is necessary to slide the screen using

X-POSITION in

order to see the full range.

LOG/LIN

To display the frequency on a linear or logarithmic scale.

ZOOM x1, x2, x4, x8

In order to expand the screen X1, X2, X4 or X8

Oscilloscope mode

VOLTS/DIV

Selected value indicates the peak-to-peak voltage required to produce a peak-to-peak deflection of

one major division on the screen

Big Screen

Displays large waveform screen with separate button bar. Use

Normal Screen

button to return

normal mode.

Note: Big screen is available only in Oscilloscope and Spectrum Analyzer modes.

Coupling

: the input signal is capacitive 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.

: the input signal is directly connected to the input amplifier/attenuator. Both AC and DC voltage

are measured.

Probe x1/x10

Use these buttons to adapt the readouts according to the x1/x10-probe setting.

CH1 On, CH2 On

Buttons turn the display of the trace ON or OFF. To get the cursor measurements of CH2 voltage

values switch CH1 off.

1.2 1GS/s oversampling mode

1.3 Controls

Contents 4

Autoset

Automatic setup for the Volts/div, Time/div, and Trigger level to produce a stable waveform of usable

size. The trigger will be set on if the wave aplitude on the screen is more then 0.5 divisions.

The signal should be repetitive for proper autoset function: Amplitude 5mV to 100V; frequency above

50Hz; duty cycle greater than 10%.

Persist

When this button is down the scope captures many acquisitions of a signal to the screen. Record

points accumulate until you release the button.

When this button is down the scope captures many acquisitions of a signal to the screen. Record

points accumulate until you release the button.

Using Persistence option you can easily analyze worst-case signal variations, such as jitter or noise.

The Persist option can also be used to locate errors in digital signals. Using this option you can

capture erroneous events even if they only occur once. Persist option makes it easy to compare

known and unknown circuits. Click "Single" button to capture multiple waveforms on the same screen.

Persist option lets you see the range over which a signal varies

Use the Persist option to get solid XY patterns in the XY Plot mode

PC Oscilloscope PCSU10005

TIME/DIV

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

the frozen waveform on the screen.

TRIGGER On/Off

Selects free run mode or trigged mode.

TRIGGER Level

Selects the signal level at which the sweep is triggered.

Triggering reference mark is displayed with the horizontal line on the left side of the screen.

TRIGGER Channel

Selects the trigger source signal (Ch1, Ch2 or Ext)

TRIGGER Edge

Selects the triggering slope:

Arrow up: Trigger occurs when triggering signal crosses trigger level in a positive going direction.

Arrow down: Trigger occurs when triggering signal crosses trigger level in a negative going direction.

>|<

Resets the triggering x-position reference point. Triggering reference mark is displayed with the

vertical line on the bottom of the screen.

RUN

Selects recurrent display update mode (RUN). Pressing the button again freezes the display.

SINGLE

When button is depressed and the trigger level is reached, refreshment of the display takes place

only once.

X-POSITION SCROLLBAR

(Below the waveform display)

Positions the trace horizontally on the screen. Triggering reference point is displayed with the vertical

line on the bottom of the screen.

S/L

Button selects linear (L) or sine(x)/x (S) interpolation. Linear interpolation connects the data points

with straight lines. Sine(x)/x interpolation uses curves to connect the data points. This smoothed

interpolation gives better waveform display at highest sine frequencies. Linear interpolation is better

for step signals. The S/L selection effects only at TIME/DIV settings 0.2 and 0.1us.

Note: Sine interpolation can result in incorrect top-top signal displaying, at frequencies above 5MHz.

1GS/s

This 1GS/s sampling rate is in use on 0.2us/div, 0.1us/div, 0.05us/div and 0.02us/div ranges.

CH1 + CH2

CH1 - CH2

XY Plot

INV. CH2

This button appears only in math mode. Toggles between math mode and normal mode.

Tip: Use Wheel Mouse's scroll wheel to fine adjust the triggering level and traces' y-position.

Connect the oscilloscope unit to the

USB

port.

For Circuit Analyzer (Bode Plotter) option connect function generator PCG10 or K8016 to

LPT1

LPT2

LPT3

To select the LPT port address for the function generator click

Hardware Setup

Options

menu or

select it from

Pc-Lab2000

startup screen.

1.4 Connection

1.5 Troubleshooting

Spectrum analyzer doesn't work

No arithmetic coprocessor in the computer.

No signal on the oscilloscope display

No communication with the computer (check that the cable is connected to the USB port)

If USB cable is connected, close the program. Disconnect and reconnect the USB cable and run

the Pc-Lab2000 program again.

RUN button is not ON.

The channel concerned is OFF.

TIME/DIV switch is in the wrong setting.

TRIGGER is ON, set TRIGGER OFF

The unit input selection is at GND.

Y position is wrongly adjusted.

Input amplitude is too large, adjust VOLTS/DIV setting.

If the above tips have no effect, then test on a different computer or different USB port.

Note. Close the program before disconnecting the USB cable.

Waveform Parameters Display

When the menu option "Waveform Parameters" of the View menu is selected the software

automatically calculates various voltage and time parameters of a signal, such as DC mean,

amplitude, rise time etc.

These parameters are displayed in a separate window. Use the check boxes in the window to select

the parameters you which to be displayed.

You may select the parameters to display for frozen waveform as well.

You may even re-open saved waveform data file to perform these measurements.

Please Note:

Do not change the scope settings when the re-opened waveform parameters are to be

read.

The green labeled parameters (High, Low, Amplitude, Rise time and Fall time) are mainly intended for

pulse shaped waveform measurements only.

For proper waveform measurement the signal levels must be appropriate. Signal levels too small will

result in noisy and inaccurate measurements. Signal levels too large will result in clipping and yield

incorrect results.

Error indication:

?? Indicates that clipping has occurred.

??? Indicates that there are too few or too many wave cycles in the waveform data or the signal

amplitude is too low. Also too noisy signal and variable frequency signal causes this

indication.

Contents 6

1.6 Waveform Parameters Display

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