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   Injector Series

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     J2101A Injection Transformer 10Hz~45MHz

icon 10Hz supports off-line power supplies
icon 45MHz high enough for even state of the art regulators
icon 23 Octave range
icon Low distortion for superior precision
icon 5 Ohm termination for minimum impact to loop
icon Includes attenuation to assure small signal measurement
icon Detailed Specifications
  Product Information

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.

  Detailed Specifications:
Performance at -10dBm input level
Characteristic Rating
Ratio 1:1
Termination Impedance 5 Ohms
Nominal 3dB Bandwidth 10Hz ~ 45MHz
Isolation Voltage 600V
Isolation Capacitance 150pF@1KHz
DC Current 10mA
Temperature Range 0 ~ 50°C
Maximum Altitude 6000 Ft


Power Supply
Digital Multimeter
Waveform Generator
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Injector Series
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