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High Resolution LXI Digitizers

Technical Overviews

The Keysight Technologies’s L4532A and L4534A are high-resolution, stand-alone LXI digitizers. They offer 2 or 4 channels of simultaneous sampling at up to 20 MSa/s, with 16 bits of resolution. Inputs are isolated and can measure up to ±250 V to handle your most demanding applications.

Input channels with the ability to measure waveforms up to 250 V are ideal for analyzing high-voltage and transient signals such as those seen in automotive and aerospace defense ap­plications. Most oscilloscopes and PXI digitizers have a maximum input range less than 40 Vpk. The ±250 V input range of the L4532A and L4534A is combined with 16-bit analog-to-digital converters (ADCs), so the isolated front-end and low input offset allows a small voltage, such as a 250 mV, and a larger voltage, such as 250 V, to be measured at the same time.

The digitizers are LXI Class C compliant providing the benefits of an Ethernet connection, standard software drivers, an enhanced web interface, and more. Multiple vendors support the LXI standard making it easy to integrate the digitizers into your test system.

Save test time and money with high-performance analog inputs

The digitizer’s individually isolated channel inputs have been designed for high performance with an ADC for each channel to ensure the signals you measure are accurately digitized without distortion or additional noise. Channel input range is configurable from ±250 mV up to ±250 V, with a floating voltage up to ±40 V to accommodate differential waveform acquisition. You can also choose to enable 2 MHz and 200 KHz input filters to your digitizer. The high voltage input, isolated inputs, and selection of noise filters reduce the need to add expensive input signal attenuation and signal conditioning circuitry, saving test develop­ment time and money.

The 16-bit dynamic range combined with the ±250 V range is an advantage for test throughput since there is no need to make repeated “passes” with different range settings to capture both the smaller waveform details and larger waveform signals.

Minimize post processing with onboard measurements

The L4532A and L4534A digitizers include a collection of on-board “scope-like” measurements such as Vmin/Vmax, Vp-p, frequency, rise/fall time, and more that can be applied to a selected portion or the overall waveform. There is no need for post processing data to get the measurement results you need, saving time and minimizing the need to transfer and store large amounts of data. The waveform measurements are made within a user-selected region of the digitized waveform and include their time position. The following measurements are supported by the digitizers:

  • V min/V max
  • VPP
  • V avg/V rms
  • V top/V base
  • Rise/fall time
  • Overshoot/preshoot
  • Frequency/period
  • Pulse width
  • Duty cycle

Key features:

  • Up to 20 M samples per second sample rate
  • 16-bit ADC resolution
  • 2 or 4 simultaneously sampled channels
  • ±250 mV to ±250 V isolated inputs
  • AC or DC coupling
  • On-board measurements
  • Built-in web interface
  • 1U, full-rack standalone instrument
  • Gigabit LAN and USB 2.0 interfaces
  • Standard 32 MSa/ch or extended 128 MSa/ch segmented memory
  • LXI Class C compliant

Easy-to-use graphical web interface

Connect to the digitizers’ graphical web interface either by direct LAN or the Internet with your PC’s Java-enabled web browser (such as Internet Explorer). Enter the IP address displayed on the front of the digitizer into the web browser address and you will be able to configure, acquire, and display waveforms and measure­ments without programming. The web interface simultaneously displays the channel signals and measurements, and provides an instrument command log that is very useful during development or debug.

The digitizer’s web interface is easy to use, even from remote locations. The setup digitizer window allows you to select the configuration including sample rate, voltage range, record size, trigger source, and trigger mode. The acquire data window displays the waveforms and measurements. The waveform display has a similar look and feel to an oscilloscope with adjustable vertical and horizontal views. Markers allow you to select a portion of the waveform to make measurements on or view the waveform more closely.

The web interface records and displays the digitizers’ instrument commands you select in the setup window. The list of instrument commands can be copied and pasted directly into your test program to expedite your test development.

 

Deep memory for flexible data acquisition

The L4532A and L4534A digitizers include a deep memory option (up to 128 MSa per channel) providing flexible waveform data acquisition. The waveform data collected is determined by the user and digitizer configuration including sample rate, segmented memory, flexible trigger system, and data reduction feature for data transferred from memory.

Segmented memory is used for sampling multiple bursts of read­ings. Memory can be segmented in 1 to 1024 records. Multiple records allow multiple bursts of data to be digitized without the need to re-initialize between bursts. The record size is configured by selecting the total number of samples including pre-trigger samples.

A flexible trigger system allows you to capture only the data you need. Trigger events are used to initialize the digitization of data for each record. Configurable trigger delay and trigger holdoff allow you to better define where record data is collected relative to the trigger event.

When retrieving digitized data users can take advantage of the built-in data reduction feature. This allows you to reduce the amount of unnecessary data through data decimation on select channels that were sampled at a faster rate than necessary

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