No. 8 : Weak Square With Noise - Metrix HX0074 Guia Del Usuario

Demo: with:
Test Signal
Specs
Scope Settings
Trigger
Modes
Purposes
a) First calibrate the Oscilloscope to provide a rough view of the signal.
Important: for this signal type using Autoset may not be useful.
b) The use of the 1.5MHz and 5kHz analogue filters on the input will enable correct synchronisation and
analysis of the signal free of any noise.
c) Use of averaging or curve smoothing (Horizontal menu) enables elimination of random noise on the
visualisation (signal step serving as a trigger) and measurement of very weak levels after a vertical zoom.
METRIX Oscilloscope Demo Kit
MTX3x5x SPO OX 6000
& MTX105x SPO
OX 6000-II

no. 8 : Weak square with noise

Type 1 square signal with very weak amplitude and lots of noise
5mV < Vpp < 30 mV (depending on filter) - F ≈ 1 kHz
200 or 500 µs/div. - MAIN = 2.5 or 5 mV/div.
Nothing at first, then 1.5 MHz filter and 5 kHz on the input
Triggering and visualisation of a noise-affected signal
Use of 15 MHz and1.5 MHz filters with 5 kHz on the input
Use of the "averaging" function
At first, after using the Autoset function or basic manual calibration, the
signal form can be seen, but the trigger does not function correctly.
As the signal is weak and noisy, use of the noise rejection function in
the Trigger Menu does not systematically provide a solution, no more
than HF rejection.
SCOPIX HANDSCOPE
on MAIN, 50 % of Vpp
Chapter II - 27