Beschreibung

Bode plot and Power Supply Rejection Ratio (PSRR) measurements are essential to assessing power supply stability and performance. The Picotest FRA bundle enables the FRA features of popular oscilloscopes to perform these tests. Breaking the loop is an essential aspect of the Bode Plot based stability measurement. The  J2100A  allows you to accomplish this in order to inject the stimulus signal from an oscilloscope. With a bandwidth of 1Hz – 5MHz, the J2100A covers most power supply applications. The J2101A  is available for applications in the 10Hz to 45MHz range. For applications requiring lower or higher bandwidths the optional J2110A solid state injector provides works as DC to well over 100MHz. While the injection transformer is a very wideband adapter, it is not useful for measuring ripple rejection (PSRR) of a power supply or even an opamp. 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 (J2120A)  is another essential test adapter. The J2120A line injector allows the input DC supply voltage to be modulated by the network analyzer source signal, as in the case of a PSRR measurement. The line injector must be capable of a frequency range well below the AC line frequency and at least above the control loop bandwidth of the circuit being tested.

The Picotest FRAB1P5 contains:
•J2100A Injection Transformer 1Hz – 5MHz
•J2120A Line Injector
•Injector User Manual
•1 Year Warranty
•VRTS1.5 Demo Board
•Optional: J2110A Solid-State Injection Transformer and Line Injector