Metrix HX0074 User manual
EN - User’s manual
SIGNAL GENERATOR CIRCUIT
HX0074 DEMO KIT FOR
SCOPIX IV
2
CONTENTS
GENERAL DESCRIPTION ...................................................................................................................................................................................3
PRESENTATION ...................................................................................................................................................................................................3
1. MISCELLANEOUS............................................................................................................................................................................................4
2. HYSTERESIS ....................................................................................................................................................................................................5
3. PULSE TRAIN ...................................................................................................................................................................................................6
4. DATA TRAIN + CS.............................................................................................................................................................................................7
5. DATA FRAME - FAULT .....................................................................................................................................................................................8
6. AMPLITUDE-MODULATED SINE WAVE........................................................................................................................................................9
7. SQUARE WAVE-RISE TIME ..........................................................................................................................................................................10
8. SQUARE WAVE - LOW LEVEL - NOISY ......................................................................................................................................................11
9. COMB OF RAPID PULSES............................................................................................................................................................................12
10. DIGITAL FRAME + FAULT ...........................................................................................................................................................................13
11. FRAME + RARE PULSE...............................................................................................................................................................................14
12. FRAME ...........................................................................................................................................................................................................15
13. HEART RECORDER.....................................................................................................................................................................................17
14. HARMONICS .................................................................................................................................................................................................18
15. DISTORTION .................................................................................................................................................................................................19
3
GENERAL DESCRIPTION
The oscilloscope kit features a circuit which generates 15 varied and representative signals, along with a guide that describes the nature of each
signal. The METRIX oscilloscope model used to perform the test and the correct calibrations for the equipment to obtain optimal visualisation.
The guide demonstrates the majority of the standard or advanced functions of these Digital Oscilloscopes, there by enabling users to familiarise
themselves rapidity, but also promotes further understanding of how digital oscilloscopes function in general so that best use can be made of them.
It features direct support for the following METRIX SCOPIX IV digital oscilloscopes, but can be used with other models, insofar as they oer the
same functions.
Range Models
SCOPIX IV OX 9062 OX9102 OX9104 OX9304
PRESENTATION
The signal generator circuit is built around a microprocessor. An LCD display 2 «UP/DOWN» buttons let you select the desired signal. It has two
channels available via BNC connection: «MAIN» and «AUX». It can be powered by a standard 9 V battery or a mains adapter used to power
METRIX Handscope oscilloscope (selection of power supply by switch), for example.
The HX0074 can be powered:
- either by a standard 9 V battery
- or via an external mains adapter (12 VDC, 1.25 mA), with negative-polarity body, as used with the METRIX oscilloscopes such as the
Handscope, for example.
The power supply mode is selected by using the switch.
The instructional manual contains a table of contents, which lists all the signals available and the models concerned, a description page for each
signal.
Familles SCOPIX IV Pages
n°1 : Miscellaneous 4
n°2 : Hysteresis 5
n°3 : Pulse train 6
n°4 : Data + CS Train 7
n°5 : Data Frame - Fault 8
n°6 : Amplitude-modulated sine wave 9
n°7 : Square wave-Rise time 10
n°8 : Square wave, low level, noisy 11
n°9 : Comb of rapid pulses 12
n°10 : Digital frame + Fault 13
n°11 : Frame + Rare pulse 14
n°12 : Frame 15
n°13 : Heart recorder 17
n°14 : Harmonics 18
n°15 : Distortion 19
4
1. MISCELLANEOUS
Demo: with: SCOPIX IV
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 20 ms/div. - MAIN = 500 mV/div. - AUX = 500 mV/div.
Trigger standard on MAIN
Modes XY (Display menu) - neither «Min/Max», or «Repetitive Signal» (Horizontal menu)
Objectives Start in a playful manner by describing the dierent display modes:
Normal, Full Trace, Full Screen, XY
a) Adjust the oscilloscope so as to display the signals correctly (possible using the «Autoset» key).
Normal mode
b) Perform the «Full Trace» «Full Screen» commands in sequence in order to avoid superposition of traces, then assign the full screen to the
display of traces.
Full Trace Full Screen
c) Return to the initial Normal display and select the “XY” mode with CH1 on X and CH4 on Y. A sequence of geometric forms will be displayed
(heart, clover, rose, spiral).
To realize copies screen by the touch and review by the viewer.
Clover Heart Spiral Rose
5
2. HYSTERESIS
Demo: with: SCOPIX IV
Test signal n°2 : Hysteresis
Nature 2 phase-shied signals, triangle and pseudo-square
Specs Vpp ≈ 3.2 V - F ≈ 1.7 kHz - square rise time ≈ 24 µs - Signal delay ≈ 40 µs
Oscilloscope Settings 200 µs/div. - MAIN = 500 mV/div. - AUX = 500 mV/div.
Trigger standard on MAIN
Modes XY (Display menu) - neither «Min/Max», or «Repetitive Signal» (Horizontal menu)
Objectives
«X(t)» and «XY» modes from phase-shied signals
Present automatic measurements with markers (F, Square rise time)
Mathematical function
a) Adjust the oscilloscope so as to display the signals correctly (possible using the «Autoset» key).
in full screen
b) Select the XY mode with CH1 on X and CH4 on Y ; add 20 automatics measurements.
Time rise with cursor and per channel
This casebook example involving a hysteresis loop is often used for educational purposes. It demonstrates the relative interests in displaying the
channels on a time basis and an XY display mode. It is used to demonstrate the simplicity of conguring the XY mode and of access to automatic
phase measurement, which is one of its uses.
c) Mathematical function created on channel 2 math 2 = (ch1 x ch2) / divv. (5).
and math 3
Divh (1) is equivalent to 10 000 samples (points) = 1 div. horizontal
The result of the multiplication is translated into division in the screen. If Vmax (ch1) = 4 div. and Vmax (ch2) = 4 div., it would have been necessary
to divide the result to 16+ div. then by divv. (4) to obtain Vmax (math3) = 4 div. During the use of mathematical functions (oces) associated with
tracks, it is necessary to verify the dynamics of the obtained result. A correction of the result (prot) of the operations by the mathematical functions
(oces) (divv(), divh() / ...) is advised to optimize the display into division in the screen.
6
3. PULSE TRAIN
Demo: with: SCOPIX IV
Test Signal n°3 : Pulse train
Nature 1 signal presenting trains of 10 pulses with a variable interval
Specs Vpp ≈ 3.4 V - F ≈ 32 kHz - Train interval ≈ 100 to 180 µs
Oscilloscope Settings 100 µs/div. - MAIN = 500 mV/div
Trigger on MAIN - Hold-O ≈ 350 µs
Modes Triggered mode preferable - Deselect «Repetitive signal» (Horizontal menu)
Objectives
Triggering with «Hold-O» on pulse trains
Automatic measurement with zone selection using manual cursor
Compare to reference
a) Adjust the oscilloscope so as to view the CH1 signal correctly (time base, sensitivity, and triggering source).
Attention, with this type of signal, «Autoset» operation may be aleatory.
Firstly, without «Hold-O», the trigger operates on any one of the pulses as soon as the oscilloscope is ready to acquire. This is accompanied by
a sensation of “horizontal instability” which renders the display unusable. The correct selection of the “Hold-O” parameter in the “Principal” tab of
the trigger menu will enable you to systematically trigger on the rst pulse in the train.
To do this, double-click in the corresponding digital zone and enter the value of 350 µs, for example. This value must be greater than the pulse train
duration in order to inhibit the trigger during this period, while remaining lower than the interval between two pulse trains (this varies between 400
and 480 µs).
To do this, double-click in the corresponding digital zone and enter the value of 350 µs, for example 350e-6.
2 measurement markers
b) Measure the variable time between 2 trains of impulses then Zoom then fast Comparison to a reference.
Press the key to create a reference.
Move the active track to be able to compare it with the reference.
We highlight clearly that the number of impulses in the train remains identical (10), but that the interval between trains varies.
Press the key again to delete the reference.
7
4. DATA TRAIN + CS
Demo: with: SCOPIX IV
Test Signal n°4 : Data train + CS
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 200 µs/div. - MAIN = 1 V/div. - AUX ≈ 1 V/div.
Trigger Principal on MAIN and Auxiliary on AUX
Modes Triggered mode preferable - Deselect «Repetitive Signal» (Horizontal menu)
Objectives Complex triggering with pulse count
«WinZoom»on pulse train
a) Adjust the oscilloscope to display simply the 2 signals (time base, sensitivities and triggering source on AUX).
Attention, with this type of signal, «Autoset» operation may be aleatory.
Ch1 Data (MAIN) and Ch2 CS (AUX)
b) We will now demonstrate the interest of complex triggers (2 sources) with the «count» or «delay» options.
The example provided will enable the synchronisation of an auxiliary signal, the Chip Select, with triggering on the desired pulse in the data frame.
Additionally, this mode will enable us to always trigger on the same pulse even if it does not arrive at an identical interval after the chip select
(pulses 4 to 9).
Trigger parameters: - Principal tab: MAIN front ; Hold--O minimum.
- Count tab or Count tab Qualier: AUX front ; DC coupling ;
Trigger delay < 9 (3 in the example)
c) Zoom graphic is a unique functionality and very impressive during demonstrations.
Using a time base of 200 µs/div., graphically select the rst group of 3 pulses and release to obtain the result Zoom simultaneously with waveform..
8
5. DATA FRAME - FAULT
Demo: with: SCOPIX IV
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 20 or 25 µs/div. - MAIN = 1 V/div. - AUX = 1 V/div.
Trigger on MAIN, pre-trigger ≈ 1 division
Modes Triggered mode preferable
Objective Triggering on pulse width of the AUX signal
a) Adjust the oscilloscope so as to display the 2 signals in Normal mode (time base, sensibility, Triggering source on MAIN).
Attention, with this type of signal, «Autoset» operation may be aleatory.
selected dierent kind of display mode: vector, envelope and all acquisition.
b) Trigger on pulse on AUX on socket.
In normal «Oscilloscope» display mode, select to trigger on the AUX signal pulse width («Trigger» menu «Pulse» tab).
Successively change the value so as to trigger on the dierent periods (32, 64, 96, 128, 160, 192 µs ...) by using the operators «<», «=» or «>».
Add cursors to calculation and time measurement to compare.
9
6. AMPLITUDE-MODULATED SINE WAVE
Demo: with: SCOPIX IV
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
Objectives
Display a fast-changing signal (e.g.: modulation)
Using «Envelope» mode
FFT + windows
a) Adjust the oscilloscope so as to display the signals correctly (possible using «Autoset» function).
«Oscilloscope» and «enveloppe» modes rough visualisation of the signal (Vpp max, modulation rate, frequency, ...).
b) FFT + waveform simultaneously
The Fast FOURIER Transform (FFT) is used to calculate the discrete representation of a signal in the frequency domain from its discrete
representation in the time domain.
It is calculated on 2500 points.
c) Before calculating the FFT, the oscilloscope weights the signal to be analyzed by a window that acts as a bandpass lter. The choice of type of
window is essential to distinguish the dierent spikes of a signal and make accurate measurements.
The total duration of the study interval results in a convolution in the frequency domain of the signal with a function sinx/x.
This convolution modies the graphic representation of the FFT because of the characteristic lateral lobes of the sinx/x function (unless the study
interval contains an integral number of periods).
Five weighting windows are proposed.
Eects of under sampling on the frequency representation: If the sampling frequency is too low (less than the twice the cut o frequency
of the signal to be measured), the high-frequency components are under sampled and are aliased (frequency-shifted)
in the graphic representation of the FFT.
10
7. SQUARE WAVE-RISE TIME
Demo: with: SCOPIX IV
Test Signal n°7 : Square wave-Rise time
Nature 1 square wave, duty cycle 50 %
Specs Vpp ≈ 3.4 V - F ≈ 10 kHz - Rise time ≈ 800 ns
Oscilloscope Settings 500 ns to 200 µs/div. - MAIN = 500 mV/div.
Trigger on MAIN, 50 % of Vpp
Modes Triggered mode preferable - Select «Repetitive signal» (Horizontal menu)
Objectives Using «zoom» for rise time
ROLL if base time > 100 ms
a) Adjust the oscilloscope so as to display the signal correctly (possible using the «Autoset» function) and add T1 and T2.
20 automatic measurements
b) Use «zoom» to characterise a rising edge
All acquisition, measure Trise
c) Select single mode, automatic release of the mode ROLL if base time > 100 ms. The new samples are shown as soon as they were acquired
and the mode ROLL is activated as soon as the memory is full (scrolling of the track of the right towards the left of the Screen).
Table of contents
Other Metrix Test Equipment manuals
Metrix
Metrix MX 435D User manual
Metrix
Metrix MTX 162UE TX 162UE User manual
Metrix
Metrix CX 1651 User manual
Metrix
Metrix HandScope OX5022B User manual
Metrix
Metrix HI-903 User manual
Metrix
Metrix CX 1651 User manual
Metrix
Metrix MTX 3252e-C User manual
Metrix
Metrix MX 604 User manual
Metrix
Metrix TCX01 User manual
Metrix
Metrix PX 110 User manual
Metrix
Metrix MX 67 User manual
Metrix
Metrix DOX 2 Series User manual
Metrix
Metrix GX-1030 User manual
Metrix
Metrix MX 535 User manual
Metrix
Metrix OX 5042 User manual
Metrix
Metrix GX 1025 User manual
Metrix
Metrix MX 407 User manual
Metrix
Metrix MTX 3352 User manual
Metrix
Metrix MX 535 User manual
Metrix
Metrix OX 832 User manual
