Metrix DOX 2 Series User manual

X04128A02 - Ed 1 - 09/15
Demonstration SET
for
METRIX DOX 2xxx
Oscilloscopes
User’s guide

METRIX Oscilloscopes Set
Contents
HX0074 Test signal
Demo with
Page
DOX2025
DOX2040
DOX2100
n° 1 : Miscellaneous
II-2
n° 2 : Hystérésis
II-4
n° 3 : Pulse train
II-8
n° 4 : Data train-CS
II-10
n° 5 : Data frame - Fault
II-13
n° 6 : AM Modulation sinus
II-16
n° 7 : Square time base
II-18
n° 8 : Weak quare with noise
II-19
n° 9 : Fast pulse comb
II-20
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
DOX2040
DOX2100
n° 1 : Long MEM with sinus 10MHz
II-31
n° 2 : Filters used on 2KHz square wave with a 62 kHz sine
wave superposed
II-33
n° 3 : Filter and FFT sum of 2 sinus signals of 10 and 80kHz
II-36
n° 4 : Delayed time base on 2 sinus signals of 100 and
800 kHz
II-38
n° 5 : Delayed time base on 2 sinus signals of 10 and
80 kHz
II-41

Kit Demo for METRIX Oscilloscopes 1
Demonstration of the functions of DOX2xxx
Oscilloscopes using the HX0074 Demo Kit and the
GX1025 Arbitrary Generator
General description
The HX0074 is an accessory with a circuit that 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 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 digital filters 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 9V battery
- or by a 12 VDC, 200mA external mains adapter, with positive polarity, that of METRIX MTX Mobile
multimeters, for example. The power supply mode is selected using the switch.

2 Kit Demo for METRIX Oscilloscopes
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 a detail.
Demo: with:
DOX2025
DOX2040
DOX2100
DOX2xxx
Test Signal
no. 1: Fanciful
Nature
4 pairs of successive signals approx. every 2 seconds.
Specs
2.6V < Vpp < 3.2V-10Hz < F < 60Hz
Oscilloscope Settings
50 ms/div.-MAIN = CH1 = 1V/div.-AUX = CH2 = 1V/div.
Trigger
standard on CH1 = MAIN
Modes
XY (Display menu)
Objective
Start in a playful manner by describing the different display modes:
Normal, Delayed, XY

Kit Demo for METRIX Oscilloscopes 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 example is
Fsample = 50 KHz

4 Kit Demo for METRIX Oscilloscopes
Demo: with:
DOX2025
DOX 2040
DOX2100
DOX2xxx
Test Signal
no. 2: Hysteresis
Nature
2 phase-shifted signals, triangle & pseudo-square
Specs
Vpp 3.2V-F 1.7kHz- square-wave Tr 24µs-signal delay 40µs
Oscilloscope Settings
100µs/div.-CH1 = MAIN = 500mV/div.-CH2 = AUX = 500mV/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-shifted 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 difference between the signals Main = CH1 and
Aux = CH2.

Kit Demo for METRIX Oscilloscopes 5
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, Freq, Rise,…).

6 Kit Demo for METRIX Oscilloscopes
d) Use of the FFT Mathematical 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" cursors can be used to determine the amplitude of the harmonics.

Kit Demo for METRIX Oscilloscopes 7
FFT of the signal on channel CH2

8 Kit Demo for METRIX Oscilloscopes
Demo: with:
DOX2025
DOX2040
DOX2100
DOX2xxx
Test Signal
no. 3: Pulse train
Nature
1 signal containing trains of 10 pulses with variable spacing
Specs
Vpp 3.4V-F 32kHz-Train spacings ( 100 to 180µs
Oscilloscope Settings
100µs/div.-CH1 = MAIN = 500mV/div.
Trigger
on CH1 = MAIN-Hold-Off 354µs
Modes
Triggered mode preferable
Objectives
Triggering with "Hold-Off" 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-Off" 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 480µs) .
In our case, the "Hold-Off" must be between 300 and 400µs.
300 µs
400 à 480 µs
300 µs

Kit Demo for METRIX Oscilloscopes 9
b) Definition 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 satisfied ("Pass") or not satisfied ("Fail")
the mask defined.

10 Kit Demo for METRIX Oscilloscopes
Demo: with:
DOX2025
DOX2040
DOX2100
DOX2xxx
Test Signal
no. 4: Data+CS train
Nature
2 signals representing a digital frame (data) and a CS (chip select)
Specs
Vpp 3.4V-F 40kHz (data)-F 1.5kHz (CS)
Oscilloscope Settings
100µs/div.-MAIN = 1 V/div.-AUX = 1 V/div.
Trigger
on BNC AUX = CH2
Modes
Triggered mode preferable
Objectives
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 first 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.

Kit Demo for METRIX Oscilloscopes 11
c) 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 position
Expansion by 25
Expansion by 100

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

Kit Demo for METRIX Oscilloscopes 13
Demo: with:
DOX2025
DOX2040
DOX2100
DOX2xxx
Test Signal
no. 5: Data frame-Fault
Nature
2 signals representing a communication bus with "clock" & "data"
Specs
Vpp 3.4V-F 31kHz (clock)-30µs < L+ < 200µs (data)
Oscilloscope Settings
25µs/div.-MAIN = 1 V/div.-AUX = 1 V/div.
Trigger
on MAIN
Modes
Triggered mode preferable-SPO mode, duration 2s
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 first 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 specific 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 (x50) and choosing the position of the zoomed window, we can observe
and analyze this frame and the one just before it and the one just after it.
Then, with the x1000 zoom factor, we observe the 6 clock pulses of the frame of zeros.
Attention: the X1000 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 x1000 Zoom factor will be wrong.

14 Kit Demo for METRIX Oscilloscopes
Zoom by 1000 in "LongMem" mode:

Kit Demo for METRIX Oscilloscopes 15
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
insufficient. This is because the sampling rate in Normal Memory Depth is 25KSPS, while it is 1MSPS in
LongMem Memory Depth

16 Kit Demo for METRIX Oscilloscopes
Demo: with:
DOX2025
DOX2040
DOX2100
DOX2xxx
Test Signal
no. 6: Amplitude-modulated sine wave
Nature
1 amplitude-modulated sinusoidal signal
Specs
1.3V < Vpp < 3.3V-F 1.3kHz
Oscilloscope Settings
100µs/div.-MAIN = 500mV/div.
Trigger
on MAIN, 50% of Vpp
Modes
Triggered mode preferable-"Delayed" Mode
Objectives
Display a fast-changing 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 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 the "Autoset" function).

Kit Demo for METRIX Oscilloscopes 17
Persistence "Off" Persistence 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-time signal of the channel with respect to the frozen
reference.

18 Kit Demo for METRIX Oscilloscopes
Demo: with:
DOX2025
DOX2040
DOX2100
DOX2xxx
Test Signal
no. 7: Square wave-Rise time
Nature
1 square wave, duty cycle 50%
Specs
Vpp 3.4V-F 10kHz-Tm 800ns
Oscilloscope Settings
500ns to 200µs/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 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