What Is SMU Digitizer Mode and Why Is It Useful?
Some KEYSIGHT source/measure unit (SMU) products support a feature called “digitizer mode”. However, from the title alone it is not obvious exactly what this feature means. This capability is related to the triggering system of the SMU, so it is helpful to review the ARM-TRIGGER model first.
Keysight products supporting the standard commands for programmable instruments (SCPI) adhere to the trigger model described in the 1999 SCPI Command Reference document. This procedure breaks down the triggering process into two steps: arm and trigger. The user must first place the instrument into the arm state before the instrument is able to initiate an action after receiving a trigger signal. Of course, in many cases, the user initiates the arm and trigger actions one after the other, but the ARM-TRIGGER model does provide an extra layer of safety to prevent the accidental initiation of an unwanted action. The following schematic shows the Arm-Trigger scheme:
Many events can place the instrument into the arm and trigger states, including commands issued programmatically and signals received from physical bus lines.
Notice that inside the “Device Action” block at the bottom of this schematic, there is another block that indicates repeated action when the digitizer mode is on. If the digitizer mode is off (or if the instrument module does not support digitizer mode), then the result of an arm and trigger sequence is only one action (for example, the acquisition of a single measurement data point). However, if the digitizer mode is on, then an arm and trigger sequence can initiate multiple actions (for example, the acquisition of multiple measurement data points). Since the arm and trigger protocol can seem a little esoteric, the best way to understand the benefits of digitizer mode is through a practical example.
Suppose you want to periodically apply a pulse to a device under test (DUT) and measure the device's behavior during the pulse. One way to achieve this would be to set the Arm source to AUTO (AINT) and the Trigger source to TIMER. You can then define a period for the timer and capture measurements at each point as shown in the following figure:
To increase the number of samples during the pulse you also must increase the number of samples in-between pulses. Therefore, this scheme captures a lot of superfluous measurement information in between pulses. If the spacing of the pulses is far apart relative to their width, then you could potentially fill up the data buffer before you are able to capture measurement data from all of the pulses.
The digitizer feature solves this challenge by allowing you to make many closely spaced measurements only when an event of interest occurs. Using digitizer mode, you can trigger the pulses (or even slightly before the pulse starts) and specify the number of measurements and the measurement spacing independently of the trigger. The following figure illustrates the benefits of using digitizer mode in this situation:
As you can see, the digitizer mode allows you to capture information on the pulse behavior much more efficiently. In addition, for most SMU modules the sampling rate in digitizer mode is faster than the sampling rate using Timer trigger mode.
Both the M9600 family of PXI-based SMUs and the PZ2100 Precision Modular Source/Measure Units have SMU modules with the digitizer function. The following table shows the minimum digitizer intervals and maximum sampling rates for the PZ2100A SMU modules:
The minimum trigger timer resolution for the PZ2100A is 4ms, so the digitizer mode does indeed provide faster sampling capability.
In conclusion, you can see that having a digitizer mode available on an SMU enables you to capture transient events much more efficiently than using the timer trigger function. In addition, the digitizer sampling rate is typically much faster than the minimum trigger timer resolution, which allows you to capture more waveform detail.
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本文由翊翊所思转载自Keysight Blogs,原文标题为:What is SMU digitizer mode and why is it useful?,本站所有转载文章系出于传递更多信息之目的,且明确注明来源,不希望被转载的媒体或个人可与我们联系,我们将立即进行删除处理。
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B2900A集电源和测量功能于一身,图形化界面以及内置的web服务器让操作更加快速准确。
新产品 发布时间 : 2017-05-26
【选型】PSS SMU S300 可替代吉利时Keithley2400/2450、 KeysightB2901A
普赛斯仪表S系列源表是历时多年打造的高精度、大动态范围、数字触摸的率先国产化的源表,集电压、电流输入输出及测量等多种功能,最大输出电压达300V,最小测试电流达100pA,支持四象限工作,因此能广泛的应用于各种电气特性测试中:半导体IC或元器件,功率器件,传感器,有机材料与纳米材料等特性测试和分析。本文介绍普赛斯仪表主打产品PSS SMU S300的产品特点、参数、应用以及替代对比。
器件选型 发布时间 : 2020-05-22
【仪器】是德科技新推出PZ2100模块化源表平台,主机可以安装4个模块,最多实现20路输出
是德科技推出PZ2100模块化源表平台,可以安装4个模块,最多实现20路输出。其在N6700C主机平台上升级而来,而为此设计的三种模块,包括高分辨率模块、高速模块和多路模块,可以帮助您配置定制化的多路源表!
产品 发布时间 : 2023-10-09
Keysight M9614A/M9615A PXIe 5-Channel Precision Source/Measure Unit
型号- M9615A,M9615-87001,M9614A,M960X,M9601-87001,PX0101A-002,PX0101A-001,N1254A-402
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