Digital Oscilloscope


Overview:

An oscilloscope or scope is an electronic measuring instrument that creates a visible two-dimensional graph of one or more electrical potential differences. The horizontal axis of the display normally represents time, making the instrument useful for displaying periodic signals. The vertical axis usually shows voltage. The display is caused by a "spot" that periodically "sweeps" the screen from left to right.

Digital storage oscilloscope Oscilloscope software running in WindowsThe digital storage oscilloscope, or DSO for short, is now the preferred type for most industrial applications, although simple analogue CROs are still used by hobbyists. It replaces the unreliable storage method used in analogue storage scopes with digital memory, which can store data as long as required without degradation. It also allows complex processing of the signal by high-speed digital signal processing circuits. The vertical input, instead of driving the vertical amplifier, is digitised by an analog to digital converter to create a data set that is stored in the memory of a microprocessor. The data set is processed and then sent to the display, which in early DSOs was a cathode ray tube, but is now more likely to be an LCD flat panel. DSOs with colour LCD displays are common. The data set can be sent over a LAN or a WAN for processing or archiving. The scope's own signal analysis software can extract many useful time-domain features (e.g. rise time, pulse width, amplitude), frequency spectra, histograms and statistics, persistence maps, and a large number of parameters meaningful to engineers in specialized fields such as telecommunications, disk drive analysis and power electronics.

Important digital oscilloscope products:

Manufacturer Model Condition Description Specs
UQ1042 3rd party pre-owned Not-on-file(other-mfr) UQ1042
QU1202CA 3rd party pre-owned Not-on-file(other-mfr) QU1202CA
ADS 2061M 3rd party pre-owned Not-on-file(other-mfr) ADS 2061M
ADS 2061M 3rd party pre-owned Not-on-file(other-mfr) ADS 2061M
Agilent MSO7104A 3rd party pre-owned 4-channel, 1 GHz mixed signal oscilloscope MSO7104A
Agilent DSO80404B 3rd party pre-owned 4 analog channel, 4GHz with a sample rate of 40GS/s @ 1 or 2CH used, 20GS/s @ 3 or 4 channels used (20GS/s monolithic A/D converter behind each channel). base memory 512kpts @ 1 or 2CH used, 256kpts @ 3 or 4 channels. Noise Floor 5mV/div-188uV(rms)… DSO80404B
Agilent 86100A 3rd party pre-owned Infiniium DCA Wide-Bandwidth Oscilloscope 86100A
Agilent 86100A 3rd party pre-owned Infiniium DCA Wide-Bandwidth Oscilloscope 86100A
Agilent 54845A 3rd party pre-owned Infiniium Oscilloscope: 4 Channels, 1.5GHz, Up to 8GSa/s 54845A
Agilent 54825A 3rd party pre-owned Infiniium Oscilloscope: 4 Channels, 500MHz, 2GSa/s 54825A
Agilent 54754A 3rd party pre-owned Differential TDR module 54754A
Agilent 54753A 3rd party pre-owned Single Ended TDR/TDT for the Agilent 54750A High-Bandwidth Digitizing Oscilloscope 54753A
Agilent 54752A 3rd party pre-owned 2 Channel 50 GHz Plug-in for the Agilent 54750A 54752A
Agilent 54750A 3rd party pre-owned High-Bandwidth Digitizing Oscilloscope 54750A
Agilent 54721A 3rd party pre-owned 1.1GHz Amplifier Plug-in for HP 54720D 54721A
Agilent 54720A 3rd party pre-owned Oscilloscope, Digital: 1.5GHz,4GSa/s,4ch (Mainframe) 54720A
Agilent 54711A 3rd party pre-owned Attenuator plug-in for HP 54720D 54711A
Agilent 54645D 3rd party pre-owned Oscilloscope, Digital: 100MHz,200MSa/s,2ch 54645D
Agilent 54645D 3rd party pre-owned Oscilloscope, Digital: 100MHz,200MSa/s,2ch 54645D
Agilent 54622A 3rd party pre-owned 2 Channel 100-MHz MegaZoom Oscilloscope 54622A
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Digital Oscilloscopes by different manufacturers:

Example usage

The classic use of a scope is to diagnose a failing piece of electronic equipment. In a radio, for example, one looks at the schematic and tries to locate the connections between stages (e.g. electronic mixers, electronic oscillators, amplifiers).

Then one puts the scope's ground on the circuit's ground, and the probe of the scope on a connection between two of the stages in the middle of the train of stages.

When the expected signal is absent, one knows that some preceding stage of the electronics has failed. Since most failures occur because of a single faulty component, each measurement can prove that half of the stages of a complex piece of equipment either work, or probably did not cause the fault.

Once the failing stage is found, further probing of the defective stage can usually tell a skilled technician exactly which component is broken. Once the technician replaces the component, the unit can be restored to service, or at least the next fault can be isolated.

Another use is to check newly designed circuitry. Very often a newly-designed circuit will misbehave because of bad voltage levels, electrical noise or design errors. Digital electronics usually operates from a clock, so a dual-trace scope is needed to check digital circuits. "Storage scopes" are helpful for "capturing" rare electronic events that cause defective operation.

Another use is for software engineers who must program electronics. Often a scope is the only way to see if the software is running the electronics properly.