PICOTEST 环测信号注入稳压器 测试信号转换器 J2101A 10Hz-45MHz

J2101A Injection Transformer 10Hz~45MHz

1.低频段转角频率達10Hz,可支援一般離線式電源供應器(off-line power supplies)之測量

2.45MHz之超G頻寬,足以對應目前稳壓器量測需求

3.超G頻寬,可達23 Octave

4.優異精確的低失真表現

5.5Ω終端,對待測電路的影響降至zui小

6. 包括衰減功能來確保小信號的測量正確性

注入变压器目前是将网络分析仪连接到被测电路的常用方法，主要用于控制回路稳定性测量。变压器的目标是将信号注入被测控制回路，而不影响回路的性能。为了在合理程度上实现这一点，变压器被隔离，因此能够在G电压上浮动，例如功率因数校正器（PFC），其通常接近400伏直流电。测量超过FRA输入额定电压的电压需要衰减探头。注入变压器的可用带宽通常明显大于3dB频率限制。这是因为变压器本身不在测量范围内，导致许多人错误地认为变压器是非关键元件。变压器的带宽与端接阻抗密切相关。大多数网络分析仪提供50欧姆振荡器源阻抗。假设该阻抗，Z佳终端电阻为5欧姆。这显著地衰减了注入信号，这通常是有益的，因为Bode测量中的一个常见错误是使用过大的信号，因此不是小信号测量。这个低值的另一个好处是，它通常可以一直留在电路中，简化了与网络分析仪的连接，而不会明显影响被测电路的输出电压。

The injection transformer is presently the prevalent method for connecting the network analyzer to the circuit being tested, and is primarily used for control loop stability measurements. The goal of the transformer is to inject a signal into the control loop being measured, without impacting the performance of the loop. In order to accomplish this to a reasonable degree, The transformer is isolated and therefore is capable of floating on a high voltage, such as a Power Factor Corrector (PFC), which is often close to 400VDC. Measuring voltages that exceed the voltage rating of the FRA inputs require attenuation probes.  The usable bandwidth of an injection transformer is generally significantly greater than the 3dB frequency limits. This is because the transformer itself is outside of the measurement, leading many to incorrectly believe that the transformer is a non-critical element.  The bandwidth of the transformer is strongly related to the terminating impedance. The most network analyzers provide a 50 Ohm oscillator source impedance. Assuming this impedance the optimal termination resistor is 5 Ohms. This significantly attenuates the injection signal, which is generally beneficial, as a common error in Bode measurements is using a signal which is too large, and therefore not a small signal measurement. An added benefit of this low value is that it can generally be left in circuit at all times, simplifying the connection to the network analyzer without appreciably impacting the output voltage of the circuit being tested

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