EMI测试接收器ESBI和ESMI将Rohde＆Schwarz EMI测试接收器的顶级规格与Rohde＆Schwarz频谱分析仪的速度相结合。集成的测量和分析功能简化并加速了所有测量，使其达到相关的商业和军事标准，例如CISPR，VDE，FCC，EN，VCCI，MIL-STD，VG，DEF-STAN，BS，DO 160，GAM-EG13。
所有这些测试接收器均满足CISPR标准16-1（08.93）和VDE标准0876的严格要求。因此，它们非常适合于符合商业标准的所有一致性测试。ESBI和ESMI为EMI测量提供了出色的特性。然而，它们也可以用作一般实验室应用的顶级频谱分析仪（更多典型特性请参见数据手册PD 756.4808 / .8384和.7120）。
•射频衰减可在宽范围内以较小的步长进行切换
•精细的预选
•很大的频率范围用于EMI测量
•具有宽动态范围的低噪声前置放大器
•用于IF转换的高级混频器
•IF前置放大器之前的附加滤波器可避免因过载而产生的过载中频部分的宽带干扰
•分析仪路径中除了110 dB对数转换器外，动态范围为70 dB的高线性包络检波器
•峰值，最小值，准峰值，平均值和RMS加权的五个并行检波器
•动态范围的DC对数转换器70 dB
•混频器和测试通道中的过载检测器，以避免错误的测量
RF动态范围
EMI测试接收机具有较大的动态范围和高灵敏度。此外，测试接收机的设置完全符合CISPR的要求，即动态范围在所有CISPR范围内都足够大，可以正确加权单个脉冲。精细的预选滤波可为宽带信号提供所需的大动态范围。可在预选器之后切换的低噪声前置放大器用于提高灵敏度。为了测量高能脉冲，提供
了第二个输入，该输入可以处理20 Hz至200 MHz频率范围内的脉冲。自动过载检测器检查信号路径中的敏感点。
信号分析
EMI测试接收机具有各种最大，最小，平均值，均方根和准峰值检测器，可用于同时进行信号分析。内置AM / FM解调器可对干扰信号进行音频监控。除了内置的正弦校准源之外，还提供了一个用于检查CISPR加权曲线的脉冲校准源，从而确保了极高的测量精度。还提供了用于各种EMC测量的跟踪生成器。
概述模式
在此模式下，整个干扰频谱显示在测试接收机的屏幕上。IF分辨率带宽可以调整为CISPR标准；中频选择性还具有准模拟设置模式，以优化扫描时间。干扰频谱可以使用线性或对数频率标度显示在屏幕上。屏幕上最多可以显示八条不同的极限线。超出限制的值将自动检测并显示。
快速，灵活的扫描
在SCAN模式下，ESBI和ESMI可直接与传统的测试接收器进行比较：
•除了在选定频率下进行测量之外，还可以开始扫描
•在开始和停止频率之间以可选步长自动进行测量
•在扫描过程中进行手动调整，并在可选子范围内重复测量，减少了测量所需的时间。
为了符合相关标准，可以在各种频率范围和带宽上进行测量必须制作。为此，用户可以在配置表中定义各种频率范围。然后使用选定的带宽，测量时间，步长等在这些子范围内进行测量。
分屏显示
结果将输出到通过水平分割屏幕显示而获得的两个窗口中。可以在上部和下部窗口中显示不同的跟踪存储器，以及来自不同检测器的结果。分屏显示非常适合分别显示窄带和宽带信号。
自动补偿传感器
测试结果始终以正确的单位显示。当然，为罗德与施瓦茨测试接收机设计的换能器适合与ESBI或ESMI一起使用。在传感器表中输入的校正系数用于自动补偿传感器系数的频率依赖性。最多可以有四个这样的表，也可以将它们组合起来。
EMI Test Receivers ESBI and ESMI combine the top-class specifications of Rohde&Schwarz EMI test receivers with the speed of Rohde& Schwarz spectrum analyzers. The integral measurement and analysis functions simplify and speed up all measurements to the relevant commercial and military standards such as CISPR, VDE, FCC, EN, VCCI, MIL-STD, VG, DEF-STAN, BS, DO 160, GAM-EG13.
All these test receivers satisfy the exacting requirements of CISPR standard 16-1 (08.93) and VDE standard 0876. They are thus highly suitable for all compliance tests in line with commercial standards. ESBI and ESMI provide excellent characteristics for EMI measurements. They can however also be used as top-class spectrum analyzers for general laboratory applications (further typical characteristics see data sheets PD 756.4808/.8384 and .7120).
• RF attenuation switchable in wide range and small steps
• Refined preselection
• Very large frequency range for EMI measurements
• Low-noise preamplifier with wide dynamic range
• High-level mixer for IF conversion
• Additional filters ahead of IF preamplifier to avoid overloading due to broadband interference in IF section
• Highly linear envelope detector with dynamic range of 70 dB in addition to 110 dB logarithmic converter in analyzer path
• Five parallel detectors for peak, minimum, quasi-peak, average and RMS weighting
• DC logarithmic converter with dynamic range of 70 dB
• Overload detectors at the mixers and in the test channel to avoid incorrect measurements
RF dynamic range
The EMI test receivers feature a large dynamic range and high sensitivity. Moreover, the test receiver settings completely conform to CISPR requirements, ie the dynamic range is large enough in all CISPR ranges to allow correct weighting of single pulses. Refined preselection filtering provides the required large dynamic range for wideband signals. A low-noise preamplifier, which can be switched after the preselector, is used to increase sensitivity. To measure high-energy pulses,
a second input is provided which can handle pulses in the frequency range from 20 Hz to 200 MHz. An automatic overload detector checks sensitive points in the signal path.
Signal analysis
EMI test receivers have a variety of maximum, minimum, average, rms and quasi-peak detectors for simultaneous signal analysis. Built-in AM/FM demodulators allow audio monitoring of interference signals. A pulse calibration source for checking the CISPR weighting curves is provided in addition to the built-in sine calibration source, thus ensuring extremely high measuring accuracy. A tracking generator for all kinds of EMC measurements is also provided.
OVERVIEW mode
In this mode, the whole interference spectrum is displayed on the screen of the test receiver. The IF resolution bandwidths can be adjusted to CISPR standards; the IF selectivity has also a quasi-analog setting mode to optimize the sweep time. The interference spectrum can be displayed on the screen using a linear or logarithmic frequency scale. A maximum of eight different limit lines can be displayed on the screen. Out-of-limit values are automatically detected and displayed.
Fast, flexible scan
In the SCAN mode, ESBI and ESMI are directly comparable with a conventional test receiver:
• In addition to measurements at the selected frequency, a scan can be started
• Measurements are made automatically between start and stop frequency and at a selectable step size
• Manual adjustments while the scan is in progress and repeat measurements over selectable subranges reduce the time required for measurements
To conform to relevant standards, measurements over various frequency ranges and bandwidths have to be made. For this purpose, the user can define a variety of frequency ranges in a configuration table. Measurements are then made over these subranges using the selected bandwidth, measurement time, step size, etc.
Split-screen display
The results are output in two windows obtained by splitting the screen display horizontally. Different trace memories, and so the results from different detectors, can be displayed in the upper and the lower window. The split-screen display is ideal for showing narrowband and broadband signals separately.
Automatic compensation for transducers
The test results are always displayed with correct units. The transducers designed for the Rohde & Schwarz test receivers are, of course, suitable for use with ESBI or ESMI. Correction factors entered in a transducer table are used to automatically compensate for the frequency dependence of the transducer factor. A maximum of four such tables are available and can also be combined.
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