Picotest
Picotest J2101A Breitband-Injektionstransformator
Picotest J2101A Breitband-Injektionstransformator
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Key Features
Overview
Der Picotest J2101A wird verwendet, um ein Signal einzuspeisen, normalerweise in eine Regelschleife, um die Stabilität von DC-DC-Wandlern zu messen. Er wurde mit einer Bandbreite von 10 Hz bis 45 MHz entwickelt und wird häufig mit einem Vektornetzwerkanalysator verwendet.
Picotest bietet zwei verschiedene Injektionstransformatoren an, die speziell für unterschiedliche Anwendungen optimiert sind. Beide sind aus Materialien gefertigt, die den meisten anderen Injektionstransformatoren überlegen sind, was zu einer deutlich verbesserten Bandbreite, Haltbarkeit und Gesamtleistung führt. Die nutzbare Bandbreite der Picotest-Injektionstransformatoren ist größer als die 3-dB-Frequenzgrenzen.
Product Information
The J2101A 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.
Detailed Specifications
| Performance at -10dBm input level | |
| Characteristic | Rating |
| DCR | |
| Ratio | 1:1 |
| Termination Impedance | 5 Ohms |
| Usable Bandwidth | 10Hz - 45MHz (Terminated into 5 Ohms) 60Hz - 45MHz (Terminated into 50 Ohms) |
| Isolation Voltage | 600V |
| Isolation Capacitance | 150pF@1KHz |
| DC Current | 10mA |
| Temperature Range | 0 ~ 50°C |
| Maximum Altitude | 6000 Ft |
Note: The upper end of the bandwidth is heavily dependent on the interconnect between the Injector and the DUT.
Frequently Asked Questions
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