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Digital Oscilloscope Characteristics
1 Bandwidth 2 Sample Rate 3 Memory Depth
Signal: 100 MHz Square Wave Real-time (or Single-shot) Sampling Mode Acquisition memory is the place where the digitized samples are stored. Deeper memory allows you
to keep your sample rate higher at slower timebase settings, which allows you to maintain full
bandwidth longer.
Suggested Bandwidth = 3x the Clock rate for analog signals or 5x Clock rate for digital signals
Rule of Thumb: Choose your bandwidth based on the edge speed (rise-time) of your signal. If Rule of Thumb: In practice: For a Gaussian front end, use 4x the bandwidth. For a maximally
you are unssure of your edge speed, utilize the suggested bandwidth. flat (or brick wall) front end, use 2.5x the bandwidth.
4 Waveform Update Rate 5 Number of Channels 6 Probes
2 or 4 analog channel The oscilloscope probe is an integral part of the measurement system. They are classified as:
oscilloscopes are the most
A) Passive probes B) Active probes
common.
Benefits: durability, high voltage range, high Benefits: high bandwidths, low loading at high
input resistance, affordable and general purpose. frequencies, low input capacitance, documented
Trade-offs: limited bandwidth, high probe accessories.
When oscilloscopes are processing data, loading. Trade-offs: less durable, more expensive, lower
To get more than 4 channels, use an MSO
they cannot capture and display signals. voltage range.
(Mixed Signal Oscilloscope), with 8 or 16
Processing time is known as dead-time.
In order to capture an infrequent signal, check if digital channels in addition to 2 or 4 analog
the oscilloscope slows down when you use channels. Typically you want to look for a
features like measurements and memory depth. MSO that is fully integrated and upgradeable
The higher the waveform update rate in deep in case you need digital channels sometime
memory, the better the scope. after the initial purchase.
7 Trigger 8 Connectivity
This is a specific control that allows you to tell the oscilloscope under what conditions you The oscilloscope communicates with
want to start an acquisition. Many types of triggers can be used to start the capture. computers and printers in two ways:
A) Legacy: via GPIB interface
and/or RS-232
B) New: USB and LAN
By integrating other instruments with
you oscilloscope, you can add additional
functionality. For example, integrated
digital channels make it easy to time
correlate analog and digital signals.
www.keysight.com/find/scopes
Product specifications and descriptions in this document subject to change without notice.