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Segmented Memory Acquisition for InfiniiVision Series Oscilloscopes

Data Sheets

Introduction

Capture more signal detail with less memory using seg­mented memory acquisition

Features:

· Optimized acquisition memory

·  Capture up to 2,000 successive waveform segments

·  Fast re-arm time

·  Down to 10 ps time-tag resolution

·  Segments include all analog and digital channels of acquisition

·  Segments include serial bus decoding

If the signals that you need to capture have relatively long idle times between low-duty-cycle pulses or bursts of signal activity, then the segmented memory option for Keysight Technol­ogies, Inc. InfiniiVision Series oscilloscopes can optimize your scope’s acquisition memory, allowing you to capture more selective signal details with less memory. With segmented memory, the scope’s acquisition memory is divided into multiple smaller memory segments. This enables your scope to capture up to 2,000 successive single-shot waveforms with a very fast re-arm time–without missing any important signal information.

After a segmented memory acquisition is performed, you can easily view all captured waveforms overlaid in an infinite-persistence display and quickly scroll through each individual waveform segment. And with a minimum 10 ps time-tagging resolution, you will know the precise time between each captured waveform segment. Common applications for this type of oscilloscope acquisition include high-energy physics measurements, laser pulse measure­ments, radar burst measurements, and packetized serial bus measurements.

Even in applications that don’t actually require segmented memory acquisition to optimize memory, using segmented memory acquisition on Keysight’s InfiniiVision oscilloscopes can enhance post-analysis navigation through low-duty-cycle signals, burst signals, and serially packetized signals. And the Keysight InfiniiVision Series oscilloscopes are the only scopes in the industry that not only provide segmented memory acquisitions simultaneously on all analog channels (up to four analog channels) and logic channels (up to 16 digital channels) of acquisition, but they also are the only scopes that provide hardware-based serial decoding on packetized serial data for each captured waveform segment.

High-Energy Physics and Laser Pulse Applications

Segmented memory acquisition in an oscilloscope is commonly used for capturing electrical pulses generated by high-energy physics (HEP) experiments, such as capturing and analyzing laser pulses. With segmented memory acquisition, the scope is able to capture every consecu­tive laser pulse (up to a maximum of 2,000 pulses), even if the pulses are widely separated.

Figure 1 shows the capture of 300 successive laser pulses with a pulse separation time of approximately 12 μs and an approximate pulse width of 3.3 ns. All 300 captured pulses are displayed in the infinite-persistence gray color, while the current selected segment is shown in the channel’s assigned color (yellow for channel 1). Note that the 300th captured pulse occurred exactly 3.62352380 ms after the first captured pulse, as indicated by the segment time-tag shown in the lower left-hand region of the scope’s display. With the scope sampling at 4 GSa/s, capturing this amount of time would require more than 14 Megapoints of conventional acquisition memory. If these laser pulses were separated by 12 ms, the amount of conventional acquisition memory to capture nearly 4 seconds of continuous acquisition time would be more than 14 Gigapoints. Unfortunately, there are no oscilloscopes on the market today that have this much acquisition memory. But since segmented memory only captures a small and selective segment of time around each pulse while shutting down the scope’s digitizers during signal idle time, the Keysight InfiniiVision scopes can easily capture this much information using just 8 Megapoints of memory (7000 Series).

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