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Metrix DOX 2 Series, User Manual

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Metrix DOX 2 Series User Manual Download Page 38

 

 

 

36  

Kit Demo for METRIX Oscilloscopes  

2.2 Sum of 2 sinusoidal signals having frequencies of 10 kHz and 80 kHz

 

 

a) Display of the sum of 10 kHz & 80 kHz sine waves  
 
The low frequency (~10 kHz) indicated by the hardware frequency counter is displayed at bottom left 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 is applied, the 10 kHz sine wave passes 
but the 80 kHz sine wave is highly attenuated: 

 

 

 

 

We are now going to observe the effect of the "Low-Pass" filter on the 10 kHz/80kHz sine wave using 
the FFT. 

 
Display of the Signal and its FFT with the "

Off

" digital filter: 

 

Summary of Contents for DOX 2 Series

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

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

Page 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...

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

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