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38

Kit Demo for METRIX Oscilloscopes

2.3 Product of 2 sine waves having frequencies of 100 kHz and 800 kHz

Display of the product signal with Delayed time base

We use the cursors to measure the frequency of the product signal, F = 800 kHz (Remark: the hardware
frequency counter indicates 399.996 kHz because the triggering level is adjusted on the peaks of the product
signal).

Configuration of the oscilloscope:
Time base range M = 100µs
Memory Depth = Normal
Acquisition: Samples
Display: Vectors

Then the low frequency of the product signal, F = 100 kHz

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Содержание DOX 2 Series

Страница 1: ...X04128A02 Ed 1 09 15 Demonstration SET for METRIX DOX 2xxx Oscilloscopes User s guide...

Страница 2: ...0 n 10 Digital frame Fault II 21 n 11 Frame rare pulse II 23 n 12 Recorder 5 signals II 24 n 13 Recorder heart II 27 n 14 Harmonics II 29 n 15 Distortion II 30 GX1025 Signal Demo with Page DOX2025 DOX...

Страница 3: ...se of all functions of the DOX2xxx We will also use a GX1025 arbitrary generator to generate the signals specific to demonstrating the advantages of LongMem long recording memory depths and of using d...

Страница 4: ...d ON Off commands in succession to be able to observe a complete trace and zoom on a detail Demo with DOX2025 DOX2040 DOX2100 DOX2xxx Test Signal no 1 Fanciful Nature 4 pairs of successive signals app...

Страница 5: ...lloscopes 3 c Select the XY mode with CH1 on X and CH2 on Y Observe that there is a succession of 4 geometrical shapes The geometrical shape obtained in XY depends on the sampling rate which in our ex...

Страница 6: ...standard on MAIN Modes XY Display menu no Min Max and no Repetitive Signal Horizontal menu Objectives y t and XY modes from phase shifted signals Present automatic measurements with markers F square...

Страница 7: ...ook case often encountered in the educational context It demonstrates the utility of display in the y t and XY mode s respectively Stress the simplicity of access to the XY mode and of access to autom...

Страница 8: ...matical function The oscilloscope displays the CH1 signal and its FFT simultaneously The Time cursors can be used to determine the frequencies of the fundamental and of the harmonics The Voltage curso...

Страница 9: ...Kit Demo for METRIX Oscilloscopes 7 FFT of the signal on channel CH2...

Страница 10: ...triggering source Attention with this type of signal Autoset operation may be aleatory Without Hold Off the triggering may act on any pulse of the train as soon as the oscilloscope is ready to acquir...

Страница 11: ...of the mask of the Pass Fail function Utility Pass Fail Mask Config Mask Generation c Activation of the Pass Fail function The Pass Fail function displays the number of times that the signal has satis...

Страница 12: ...scope to display simply the 2 signals time base sensitivities and triggering source on the BNC AUX CH2 Attention with this type of signal Autoset operation may be aleatory b We are now going to demons...

Страница 13: ...Observe the first data group after the negative going edge of the chip select using the Delayed function Example to display the 2nd group of pulses we shift the window by acting on the horizontal pos...

Страница 14: ...12 Kit Demo for METRIX Oscilloscopes Horizontal displacement of the Zoomed zone by acting on the Position encoder...

Страница 15: ...and a clock This communication setup is found in particular with the protocols of serial links such as the I2C bus USB bus CAN bus Ethernet communication etc The first utility of the operating mode is...

Страница 16: ...14 Kit Demo for METRIX Oscilloscopes Zoom by 1000 in LongMem mode...

Страница 17: ...Memory Depth Normal The representation is wrong the train of 6 pulses is represented by a single pulse the horizontal resolution is insufficient This is because the sampling rate in Normal Memory Dept...

Страница 18: ...ging signal e g modulation Automatic difference from reference measurements Using the Delayed mode and the automatic peak amplitude measurement we can observe the global shape of the signal and a zoom...

Страница 19: ...nce Infinite Difference from reference We can press the REF key to record the signal on one of the 2 channels as reference then validate this reference by On and observe the variations of the real tim...

Страница 20: ...lloscope Settings 500ns to 200 s div MAIN 500mV div Trigger on MAIN 50 of Vpp Modes Triggered mode preferable Objectives Using automatic measurements F P Tr Tm Vpp Vrms etc Activation of a particular...

Страница 21: ...s div MAIN 2 5 or 5mV div Trigger on MAIN 50 of Vpp Modes nothing at first then 100kHz low pass filtering Objectives Triggering and display for a noisy signal Using the Digital filters a Adjust the os...

Страница 22: ...te and precise representation of signals Delayed LongMem mode a Adjust the oscilloscope so as to display the pulse trains and a zoomed train of 6 pulses Attention with this type of signal Autoset oper...

Страница 23: ...500mV div DC coupling Trigger DC coupling on MAIN level 250mV Modes Select Repetitive Signal Horiz menu Objectives Using triggering on pulse width Using the LongMem and Delayed mode a Display the sign...

Страница 24: ...22 Kit Demo for METRIX Oscilloscopes Use the Delayed and LongMem mode in order to be able to analyze the fault and the digital frame in detail...

Страница 25: ...the signal approximately possible using the Autoset mode then set the parameters as indicated opposite b The signal displayed represents a digital clock at 100ns By paying attention it may be possible...

Страница 26: ...y presentation of the Scan mode for the 50ms div time base Attention the Scan and LongMem modes along with the Scan and Delayed modes are not compatible Attention in Scan mode for the Level to be acti...

Страница 27: ...Kit Demo for METRIX Oscilloscopes 25...

Страница 28: ...26 Kit Demo for METRIX Oscilloscopes By placing the triggering level above the mean level of the signal and acting on the width of the positive pulse it is possible to synchronize to the high pulse...

Страница 29: ...VDC Specs Frequency of the signal 0 5s amplitude 3 2V heartbeat Oscilloscope Settings Duration 10s then 2s MAIN AUX 500mV div DC coupling Trigger None at first then EXT thresholds on MAIN levels 1V 2...

Страница 30: ...no 13 by Zooming in STOP serves to observe one period of signal CH2 and signal CH1 in detail c The measurements can be made using the manual cursors but it is also possible to display the 23 automatic...

Страница 31: ...uare Oscilloscope Settings 5 ms div MAIN AUX 1 V div DC coupling Trigger DC coupling on MAIN 50 of Vpp for example Modes Oscilloscope mode y t and Objectives Display of a square and a triangular signa...

Страница 32: ...ling imperative Trigger DC coupling on MAIN level 50 of Vpp for example Modes Oscilloscope mode Objectives Display of a frequency modulated 50Hz sine wave with components a Adjust the oscilloscope so...

Страница 33: ...herefore be in this case 20ns when LongMem is active and 400ns in Normal mode To see the effect of the LongMem function during a fine analysis of a signal we are going to observe in Delayed mode a sin...

Страница 34: ...nstituted because the 400ns sampling interval is longer than the 100ns period of the 10 MHz sinusoidal signal Conclusion By switching the memory depth from Normal to LongMem we can record the same tim...

Страница 35: ...efore on the time base range M 250 s so we recommend observing the details of the signals with the Delayed time base W 25 s and a normal memory depth this does not alter the cut off frequencies of the...

Страница 36: ...by the high pass filter leaving only the 60 kHz sinusoidal signal which is above the low cut off frequency of the filter d A bandpass digital filter having a pass band from 12 5 kHz to 100 kHz is app...

Страница 37: ...Kit Demo for METRIX Oscilloscopes 35 e A band stop digital filter 25 kHz to 800 kHz is applied The 62 kHz sinusoidal signal is attenuated while the 2 kHz square wave passes intact...

Страница 38: ...eft of the screen take care to set the triggering level close to zero We use the cursors to measure the high frequency 76 92 kHz When a low pass digital filter having a cut off frequency of 37 5 kHz i...

Страница 39: ...0 kHz fundamental and the 80 kHz harmonic of the signal FFT of the signal with the low pass digital filter having a cut off frequency of 37 5 kHz The FFT shows the 10 kHz fundamental but the 80 kHz ha...

Страница 40: ...cursors to measure the frequency of the product signal F 800 kHz Remark the hardware frequency counter indicates 399 996 kHz because the triggering level is adjusted on the peaks of the product signa...

Страница 41: ...cy 900 kHz 800 kHz 100kHz and at the difference frequency 700 kHz 800 kHz 100 kHz Using a bandpass filter centred on 700 kHz then on 900 kHz we are going to be able to isolate these 2 spectral compone...

Страница 42: ...METRIX Oscilloscopes Display of the 700 kHz spectral component with delayed time base b A bandpass filter 825 kHz 1 MHz is used to isolate the 900 kHz component Display of the 900 kHz component with d...

Страница 43: ...use the cursors to measure the frequency of the 80 kHz product signal remark the hardware frequency counter indicates 40 0 kHz because the triggering level is adjusted on the peaks of the product sign...

Страница 44: ...ude one at the F 90kHz sum frequency 10 kHz 80 kHz and the other at the F 70 kHz difference frequency 80 kHz 10 kHz We use a bandpass digital filter 60 kHz 80 kHz to isolate the 70 kHz spectral spike...

Страница 45: ...Kit Demo for METRIX Oscilloscopes 43...

Страница 46: ...44 Kit Demo for METRIX Oscilloscopes We separate the 90 kHz spectral spike with a bandpass filter 85 kHz 100 kHz...

Страница 47: ...Kit Demo for METRIX Oscilloscopes 45 We view the filtered signal and use the cursors to measure its frequency F 90 kHz and its amplitude 5 12 Vpeak to peak...

Страница 48: ...46 Kit Demo for METRIX Oscilloscopes Remark the 70 kHz and 90 kHz components have the same amplitude...

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