No. 3 : Pulse Train - Metrix HX0074 Guia Del Usuario

Demo: with:
Test Signal
Specs
Scope Settings
Trigger
Modes
Purposes
a) Calibrate the Oscilloscope so as to view the CH1 signal correctly (timebase, sensitivity and trigger source).
Important: for this signal type using Autoset may not be useful.
Firstly, without "Hold-Off", 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.
300 µs
400 to 480 µs
b) Select the Automatic Measurement of "L-" or [W- W+] and highlight the appropriate zone using the Manual
Cursors so as to measure the variable interval between two pulse trains.
without frame
c) Rapid comparison with a reference.
22 - Chapter II
MTX3x5x SPO OX 6000
& MTX105x SPO
OX 6000-II
Type 1 signal presenting trains of 10 pulses with a variable interval
Vpp ≈ 3.4 V - F ≈ 32 kHz - L+ ≈ 16 µs - Train interval ≈ 100 to 180 µs
100 µs/div. - MAIN = 500 mV/div.
on MAIN - Hold-Off ≈ 350 µs
Triggered mode preferred - deselect "Repetitive signal" (Horizontal menu)
Trigger with "Hold-Off" on pulse trains
Automatic Measurement of "L-" or [W- W+] with zone selection using manual
Comparison with a reference and "L-" or [W- W+] measurement with zone
The correct selection of the "Hold-Off" parameter in the "Principal" tab of
the Trigger menu will enable you to systematically trigger on the first
pulse in the train.
To do this, double-click in the corresponding digital zone and enter the
value of 350µs, 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).
with frame (1 & 2 cursors)
Press the key to create a reference.
Move the active trace down to be able to compare it with the displayed
reference.
It is clearly demonstrated that the number of pulses in the train remains
identical (10) but the interval between trains may vary.
Press the key again to delete the reference.
HANDSCOPE
SCOPIX

no. 3 : Pulse train

cursors
selection
METRIX Oscilloscope Demo Kit