J2100A Injection Transformer 1Hz - 5MHz J2101A Injection Transformer 10Hz - 45MHz J2110A Solid State Injector J2120A Line Injector J2130A DC Bias Injector J2111A Current Injector J2170A High PSRR Power Adapter (Shipped Separay) User manual
PICOTEST儀鼎儀器專業測試訊號轉換器
INJB02測試訊號轉換器
What's included: J2110A Solid State Injector J2111A Current Injector J2120A Line Injector J2130A DC Bias Injector J2140A Attenuator J2170A High PSRR Power Adapter User manual
INJB03測試訊號轉換器
What's included: J2111A Current Injector J2101A Injection Transformer 10Hz - 45MHz J2120A Line Injector J2140A Attenuator J2170A High PSRR Power Adapter User manual
J2100A Injection Transformer 1Hz~5MHz
J2100A測試訊號轉換器
Low band corner frequency 達1Hz,可支援 功率因數控制器(PFC)之穩定性測試
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.
