Product Information

While the injection transformer used for Bode plots is a very wideband transformer, it is not useful for measuring ripple rejection (PSRR) of a power supply or even an opamp. Doing so could permanently damage the transformer. This is because the attributes that make the injection transformer perform so well also result in a transformer that is intolerant of DC current.

Even very small DC currents (5mA or less) can greatly reduce the signal capacity or even totally saturate the transformer. For this reason, the Picotest line injector (J2121A) is another essential test adapter for power supply testing.

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