Chauvin Arnoux metrix HX0074 User manual
EN - User’s manual
Signal generator circuit
HX0074 demo kit for
DOX2xxx and DOX2xxxB
Demonstration GX1025 with
DOX2xxx and DOX2xxxB
2
CONTENTS
GENERAL DESCRIPTION ...................................................................................................................................................................................3
PRESENTATION OF THE HX0074 ......................................................................................................................................................................3
I. TEST SIGNAL HX0074 .....................................................................................................................................................................................4
1. MISCELLANEOUS............................................................................................................................................................................................4
2. HYSTERESIS ....................................................................................................................................................................................................5
3. PULSE TRAIN ...................................................................................................................................................................................................7
4. DATA + CS TRAIN.............................................................................................................................................................................................8
5. DATA FRAME-FAULT .....................................................................................................................................................................................10
6. AMPLITUDE-MODULATED SINE WAVE......................................................................................................................................................12
7. SQUARE WAVE-RISE TIME ..........................................................................................................................................................................13
8. SQUARE WAVE - LOW LEVEL - NOISY ......................................................................................................................................................14
9. COMB OF RAPID PULSES............................................................................................................................................................................15
10. DIGITAL FRAME + FAULT ...........................................................................................................................................................................16
11. FRAME + RARE PULSE...............................................................................................................................................................................17
12. RECORDER-5 SIGNALS..............................................................................................................................................................................18
13. HEART RECORDER.....................................................................................................................................................................................20
14. HARMONICS .................................................................................................................................................................................................21
15. DISTORTION .................................................................................................................................................................................................22
II. DEMONSTRATION GX1025 WITH DOX2000..............................................................................................................................................23
1. USING THE GX1025 GENERATOR TO DEMONSTRATE THE ADVANTAGES OF THE “LONGMEM” MEMORY DEPTH AND
OF THE DIGITAL FILTERS ............................................................................................................................................................................23
1.1. Inuence of memory depth (LongMem or Normal) on the sampling interval:........................................................................................23
2. USING THE DIGITAL FILTERS .....................................................................................................................................................................24
2.1. 2 kHz square wave with a 62 kHz sine wave superposed on its plateaus ............................................................................................24
3. SUM OF 2 SINUSOIDAL SIGNALS HAVING FREQUENCIES OF 10 KHZ AND 80 KHZ........................................................................26
3.1. Display of the sum of 10 kHz and 80 kHz sine waves...........................................................................................................................26
4. PRODUCT OF 2 SINE WAVES HAVING FREQUENCIES OF 100 KHZ AND 800 KHZ............................................................................28
4.1. Display of the product signal with Delayed time base ...........................................................................................................................28
5. PRODUCT OF 2 SINUSOIDAL SIGNALS HAVING FREQUENCIES OF 10 KHZ AND 80 KHZ..............................................................30
5.1. Display of the product signal with Delayed time base ...........................................................................................................................30
3
GENERAL DESCRIPTION
The HX0074 is an accessory with a circuit the generates 15 representative signals. It is associated with a guide describing the nature of the signals.
The HX0074 demonstrator makes mastering the oscilloscope faster, because the display, analysis, and measurement of the signals generated
by the HX0074 make use of all functions of the DOX2000.
We will also use a GX1025 arbitrary generator to generate the signals specic to demonstrating the advantages of «LongMem» long recording
memory depths and of using digital lters to observe composite signals.
PRESENTATION OF THE HX0074
The HX0074 is built around a microprocessor. An LCD display unit and «UP/DOWN» buttons are used to select the desired signal. The HX0074
generates the signals on the «MAIN» and «AUX» BNCs.
The HX0074 can be powered:
- either by a standard 9 V battery
- or by a 12 VDC, 200 mA external mains adapter, with positive polarity, that of METRIX MTX Mobile multimeters, for
example.
The power supply mode is selected using the switch.
4
I. TEST SIGNAL HX0074
1. MISCELLANEOUS
Demo: with: DOX2025 DOX2040 DOX2100 DOX2xxxB
Test signal n°1 : Miscellaneous
Nature 4 pairs of successive signals approx. every 2 seconds.
Specs 2.6 V < Vpp < 3.2 V - 10 Hz < F < 60 Hz
Oscilloscope Settings 50 ms/div. - MAIN = CH1 = 1 V/div. - AUX = CH2 = 1 V/div.
Trigger standard on CH1 = MAIN
Modes XY (Display menu)
Objective Start in a playful manner by describing the dierent display modes:
Normal, Delayed, XY
a) Adjust the oscilloscope so as to display the signals correctly (possible using the «Autoset» key).
When Autoset is exited, the oscilloscope adjusts the vertical position so that the traces are not superposed.
b) Apply the “Delayed” and “ON” “OFF” commands in succession to be able to observe a complete trace and zoom on detail.
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 example is Fsample = 50 kHz.
5
2. HYSTERESIS
Demo: with: DOX2025 DOX2040 DOX2100 DOX2xxxB
Test Signal n°2 : Hysteresis
Nature 2 phase-shied signals, triangle and pseudo-square
Specs Vpp ≈ 3.2 V - F ≈ 1.7 kHz - square wave ≈ 24 µs - signal delay ≈ 40 µs
Oscilloscope Settings 100 µs/div. - CH1 = MAIN = 500 mV/div. - CH2 = AUX = 500 mV/div.
Trigger standard on MAIN
Modes XY (Display menu) - no «Min/Max», and no «Repetitive Signal» (Horizontal menu)
Objectives
«y(t)» and «XY» modes from phase-shied signals
Present automatic measurements with markers (F, square-wave Tr)
Present phase measurements (manual, automatic)
Present the FFT Mathematical function
a) Adjust the oscilloscope so as to display the signals correctly (possible using the «Autoset» key) and select automatic phase measurement to
determine the phase dierence between the signals Main = CH1 and Aux = CH2.
b) Select the XY mode with CH1 on X and CH2 on Y.
The display of a hysteresis cycle is a “textbook 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 automatic phase measurement.
c) Return to «y(t) mode» in order to demonstrate the use of the automatic measurements. (Ex.: Vpp, Vamp, Feq, Rise, ...).
6
d) Use of the FFT Mathematical function.
The oscilloscope displays the CH1 signal and its FFT simultaneous. The “Time” cursors can be used to determine the frequencies of the fundamental
and of the harmonics:
The “Voltage” cursors can be used to determine the amplitude of the harmonics:
FFT of the signal on channel CH2 :
7
3. PULSE TRAIN
Demo: with: DOX2025 DOX2040 DOX2100 DOX2xxxB
Test Signal n°3 : Pulse train
Nature 1 signal containing trains of 10 pulses with variable spacing
Specs Vpp ≈ 3.4 V - F ≈ 32 kHz - Train spacings ≈ 100 to 180 µs
Oscilloscope Settings 100 µs/div. - CH1 = MAIN = 500 mV/div
Trigger on CH1 = MAIN - Hold-O ≈ 354 µs
Modes Triggered mode preferable
Objective Triggering with «Hold-O» on pulse trains
a) Adjust the oscilloscope to display the signal on CH1 correctly (time base, sensitivity, and 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 acquire. This is
accompanied by a feeling of “horizontal instability”, making the display unusable. The proper setting of the “Hold-O” parameter (in the “Triggering”
menu “Set”) serves to ensure systematic triggering on the first pulse of the train.
This value must be greater than the duration of the pulse train, to disable triggering during this period, but must remain shorter than the time between
2 pulse trains (which varies between 400 and 480 µs). In our case, the “Hold-O” must be between 300 and 400 µs.
b) Denition of the mask of the “Pass/Fail” function. “Utility” Pass/Fail Mask Cong Mask Generation
c) Activation of the Pass/Fail function
The Pass/Fail function displays the number of times that the signal has satised (“Pass”) or not satised (“Fail”) the mask dened.
8
4. DATA + CS TRAIN
Demo: with: DOX2025 DOX2040 DOX2100 DOX2xxxB
Test Signal n°4 : Data + CS train
Nature 2 signals representing a digital frame (data) and a CS (chip select)
Specs Vpp ≈ 3.4 V - F ≈ 40 kHz (data) - F ≈ 1.5 kHz (CS)
Oscilloscope Settings 100 µs/div. - MAIN = 1 V/div. - AUX ≈ 1 V/div.
Trigger on BNC AUX = CH2
Modes Triggered mode preferable
Objective Triggering on pulses
a) Adjust the oscilloscope 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 demonstrate the utility of the pulse width triggers. The example chosen will serve to synchronize to the chip select signal
of the data frame. We are going to trigger by turns on the width of the high level, then of the low level, of the “positive” pulse. In the rst case,
triggering will be on the negative-going edge of the chip select and in the second case it will be on the positive-going edge.
c) Observe the rst 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 position.
9
Expansion by 25
Expansion by 100
Horizontal displacement of the Zoomed zone by acting on the “Position” encoder:
10
5. DATA FRAME-FAULT
Demo: with: DOX2025 DOX2040 DOX2100 DOX2xxxB
Test Signal n°5 : Data frame-Fault
Nature 2 signals representing a communication bus with «clock» and «data»
Specs Vpp ≈ 3.4 V - F ≈ 31 kHz (clock) - 30 µs < L+ < 200 µs (data)
Oscilloscope Settings 25 µs/div. - MAIN = 1 V/div. - AUX ≈ 1 V/div.
Trigger on MAIN
Modes Triggered mode preferable - SPO mode, duration ≥ 2 s
Objectives Capture and observe a rare event using SPO
Triggering on pulse width of the AUX signal
a) Adjust the oscilloscope so as to display the 2 signals in LongMem mode (time base, sensitivities, triggering source on MAIN).
Attention, with this type of signal, “Autoset” operation may be aleatory.
b) Observe a clock and the data bus using the “LongMem” function and the horizontal “Zoom”.
The proposed signal is representative of a communication bus with “data - 8 bits” 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 rst utility of the operating mode is to detect and study faults in signals, without knowing their nature in advance, and therefore without having
to set specic triggering conditions, for example.
In our example, we have frames approximately 3 ms apart and 1 frame in 120, or one frame every 360 ms, with the data at zero.
In STOP, using the horizontal zoom (x 50) and choosing the position of the zoomed window, we can observe and analyse this frame and the one
just before it and the one just after it.
Then, with the x 1000 zoom factor, we observe the 6 clock pulses of the frame of zeros.
Attention ! the x 1000 zoom factor is available only in the «LongMem» mode, which is available only on the
DOX2040 and the DOX2100, on the DOX2025 or on the DOX2040-DOX2100 in Mem.depth mode = “Normal”, the
representation of the signal with the x 1000 Zoom factor will be wrong.
11
Zoom by 1000 in “LongMem” mode:
Zoom by 1000 in Memory Depth “Normal”:
The representation is wrong: the train of 6 pulses is represented by a single pulse ; the horizontal resolution is insucient. This is because the
sampling rate in Normal Memory Depth is 25KSPS, while it is 1MSPS in LongMem Memory Depth.
12
6. AMPLITUDE-MODULATED SINE WAVE
Demo: with: DOX2025 DOX2040 DOX2100 DOX2xxxB
Test Signal n°6 : Amplitude-modulated sine wave
Nature 1 amplitude-modulated sinusoidal signal
Specs 1.3 V < Vpp < 3.3 V - F ≈ 1.3 kHz
Oscilloscope Settings 100 µs/div. - MAIN = 500 mV/div.
Trigger on MAIN, 50 % of Vpp
Modes Triggered mode preferable-«Delayed» Mode
Objectives Display a fast-changing signal (e.g., modulation)
Automatic «dierence from reference» measurements
Using the Delayed mode and the automatic peak amplitude measurement, we can observe the global shape of the signal and a zoomed zone.
The measured amplitude (Vpp) of the signal in the zoomed zone is displayed on the right side of the screen. By shifting the zoom window using
the “Horizontal position” button, we can determine the variation of the amplitude of the AM signal vs time.
Adjust the oscilloscope so as to display the signals correctly (possible using “Autoset” function).
Persistence«O» PersistenceInnite
Dierencefromreference
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-time signal of the channel with respect to the frozen reference.
13
7. SQUARE WAVE-RISE TIME
Demo: with: DOX2025 DOX2040 DOX2100 DOX2xxxB
Test Signal n°7 : Square wave-Rise time
Nature 1 square wave, duty cycle 50 %
Specs Vpp ≈ 3.4 V - F ≈ 10 kHz - Tm ≈ 800 ns
Oscilloscope Settings 50 ns to 200 µs/div. - MAIN = 500 mV/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 measurement
a) Adjust the oscilloscope so as to display the signal correctly (possible using the “Autoset” function), then validate the 23 automatic measurements
available.
b) Rise Time measurement
14
8. SQUARE WAVE - LOW LEVEL - NOISY
Demo: with: DOX2025 DOX2040 DOX2100 DOX2xxxB
Test Signal n°8 : Square wave, low level, noisy
Nature 1 square wave of very low amplitude and very noisy
Specs 5 mV < Vpp < 30 mV (depending on ltering) - F ≈ 1 kHz
Oscilloscope Settings 200 or 500 µs/div. - MAIN = 2.5 or 5 mV/div.
Trigger on MAIN, 50 % of Vpp
Modes nothing at rst, then 100 kHz low-pass ltering
Objectives Triggering and display for a noisy signal
Using the Digital lters
a) Adjust the oscilloscope so as to display the signal approximately.
Attention, with this type of signal, “Autoset” operation may be aleatory.
The noisy signal is of low amplitude.
b) The use of a 100 kHz digital low-pass lter makes it possible to analyse the signal without the noise.
15
9. COMB OF RAPID PULSES
Demo: with: DOX2025 DOX2040 DOX2100 DOX2xxxB
Test Signal n°9 : Comb of rapid pulses
Nature Comb of 6 very brief pulses, with a low repetition rate
Specs Vpp ≈ 2 V (depending on whether 50 Ω load or not) - F ≈ 8 kHz
Oscilloscope Settings 25 µs/div., then 10 ns/div. - MAIN = 500 mV/div.
Trigger on MAIN, 50 % of Vpp
Modes «LongMem», «Delayed», «ETS»
Objectives Utility of the ETS for an accurate and precise representation of signals
«Delayed» and «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” operation is in principle impossible.
Because of the very brief duration of the pulse (25 ns) compared to their repetition interval (≈ 125 µs), we need a ratio of 1000 between the main
time base and the “Delayed” time base.
b) We can also observe the train of 6 pulses in detail in the ETS mode with a 10 ns/div. time base.
The example below presents a train of 6 pulses having a duration < 10 ns with a rise time < 4 ns.
16
10. DIGITAL FRAME + FAULT
Demo: with: DOX2025 DOX2040 DOX2100 DOX2xxxB
Test Signal n°10 : Digital frame + Fault
Nature Digital frame with a recurrent fault
Specs F square wave ≈ 5 MHz, Vpp ≈ 1.8 V - L+ fault ≈ 7 ns
Oscilloscope Settings 25 or 50 ns/div., then 250 ns/div. - MAIN = 500 mV/div. DC coupling
Trigger DC coupling on MAIN, level ≈ 250 mV
Modes Select «Repetitive Signal» (Horiz menu)
Objectives Using triggering on pulse width
Using the LongMem and Delayed mode
a) Display the signal (possible using the “Autoset” key), then set the parameters as indicated below.
It can be seen that the display is not stable.
Set the triggering to pulse width < 20 ns and adjust the triggering level to close to the low level of the pulse in order to trigger on the fault.
Use the Delayed and LongMem mode in order to be able to analyse the fault and the digital frame in detail.
17
11. FRAME + RARE PULSE
Demo: with: DOX2025 DOX2040 DOX2100 DOX2xxxB
Test Signal n°11 : Frame + Rare pulse
Nature Digital clock signal with a fault
Specs F clock ≈ 5 MHz, Vpp ≈ 3.3 V
Oscilloscope Settings 100 ns/div., then 25 ns/div. - MAIN = 500 mV/div. DC coupling
Trigger DC coupling on MAIN, level ≈ 1.8 V
Modes Triggered mode preferable - SPO mode, duration 1 or 2 s
Objectives Capture and display of a rare fault in SPO mode
Triggering possible on pulse width < 20 ns, after SPO analysis
a) Adjust the oscilloscope so as to display the signal approximately (possible using the “Autoset” mode), then set the parameters as indicated opposite.
b) The signal displayed represents a digital clock at 100 ns.
By paying attention, it may be possible to spot a certain instability of some edges of the signal.
c) Enter Delayed mode with 10 ns/div. for the delayed time base.
The fault is rather rare, since it aects only one clock pulse in 1000.
It is a brief pulse, lasting less than 10 ns, on the negative-going edge of the clock pulse.
We are going to use triggering on pulse width < 20 ns by placing the triggering level on the top part of the clock pulse to achieve stable triggering
on the fault, then use the Delayed and LongMem mode to display the clock signal and the fault.
18
12. RECORDER-5 SIGNALS
Demo: with: DOX2025 DOX2040 DOX2100 DOX2xxxB
Test Signal n°13 : Recorder-5 signals
Nature Tracking of 5 slow signals having varied shapes and characteristics
Specs Duration of each signal ≈ 1 s, amplitude 1.5 V < Vpp < 3.5 V
Oscilloscope Settings Duration-2 s scale - 40 µs - MAIN = 500 mV/div. DC coupling
Trigger None at rst, then threshold(s) on MAIN, level according to signal
Modes «Source/Level» triggering
Objectives
Elementary presentation of the «Scan» mode for the < 50 ms/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 active, the triggering must be in
«Normal» mode when the Type of Trigger is on «Front».
Observe in Scan mode the signals delivered by the HX0074 demonstrator.
Using triggering on pulse width and acting on the position of the level, it will be possible to trigger on each of the 5 slow signals.
By placing the triggering level close to zero and programming the pulse width, it is possible to synchronise to the damped sine wave, the low pulse,
and the low ramp.
19
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 synchronise to the
high pulse.
20
13. HEART RECORDER
Demo: with: DOX2025 DOX2040 DOX2100 DOX2xxxB
Test Signal n°13 : Heart recorder
Nature Slow «heartbeat» type signal and increasing/decreasing VDC
Specs Frequency of the signal ≈ 0.5 s, amplitude ≈ 3.2 V (heartbeat)
Oscilloscope Settings Duration 10 s then 2 s - MAIN and AUX = 500 mV/div. DC coupling
Trigger None at rst, then EXT thresholds on MAIN, levels 1 V and 2.6 V
Modes «Source/Level» triggering
Objective Entry of slow signals, «Normal» trigger mode
a) Entry of signal no. 13 by “Front” type triggering, source CH2, “Normal” trigger mode.
b) Display of Signal 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 measurements made on the
desired channel simultaneously.
This manual suits for next models
1
Table of contents
Other Chauvin Arnoux Power Tools manuals
