Mixed-signal scope speeds acquisition - Embedded.com

Mixed-signal scope speeds acquisition


Yokogawa’s DLM2000 series is a family of mixed-signal oscilloscopes (MSOs) provide up to 500 MHz bandwidth and 2 GS/s sampling speed. The scopes have a memory of up to 125 million points and an update rate up to 450,000 waveforms per second.

The DLM2000 series includes histogram and trending functions, up to 20,000 history memories, digital filtering, zoom windows, user-defined mathematics and serial bus analysis.

The series consists of six models: three with two channels and three with four, each covering the bandwidths 200, 350 and 500 MHz, respectively. Mixed-signal oscilloscope operation is enabled on the 4-channel models by converting the fourth channel of analogue input to 8-bit logic, so that the instrument then functions as a 3-channel analogue plus 8-bit logic MSO.

A high-resolution mode (up to 12-bit) is also available and the logic capability is complemented by the availability of new logic probes with individual bit threshold setting and 100 kΩ input impedance at 250 MHz.

The instruments have a 8.4 inch (21.3 cm) high-resolution (XGA) display in a compact ‘portrait’ format package that occupies the size of a single A4 sheet of paper on the benchtop. The display is enhanced by a fine grid, high luminance and viewing angle, and on-screen markers with simultaneous display of cursors and automatic parameters.

Other features include backlit buttons, additional knobs and jog shuttle, on-screen information in English, German, French, Italian and Spanish languages, two zoom windows with 80:20 or 50:50 zoom/main area split, and a choice of first-cycle or screen average mode for frequency measurement. An option provide up to 125 million points of storage capacity is available, allowing, for example, 10 kHz signals to be recorded for up to 5000 seconds. Even at a sampling rate of 1.25 GS/s, waveforms down to 0.1 sec can be captured.

With the history function, up to 20,000 previously captured waveforms can be saved in the acquisition memory, and any one or all of them can be displayed on screen with the ability to carry out cursor measurements and other analysis operations including FFT analysis and comprehensive user-defined maths. Waveforms can be displayed one at a time, in order, or automatically played back, paused, fast-forwarded or rewound.

Triggers can combine analog and logic inputs such as edge, enhanced and B-triggers. These include dedicated trigger functions for CAN, LIN, UART, I2C and SPI serial bus patterns as well as the ability to perform simultaneous analyses on two different buses operating at different speeds. This capability is enhanced by the extensive search facilities, allowing the user to look for specific data in the very long memory.


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