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   Injector Series

Home > Products> J2121A
     J2121A High Power Line Injector
icon 400V/20A max – Supports High Power 270V Military and Satellite Buss Applications
icon 100Hz - 1MHz bandwidth
icon Regulated Input-Output Voltage Drop, 700mV
icon Isolated Current Sense Monitor Output
icon Fan cooled, Includes low-noise power supply - J2171A
icon Detailed Specifications
  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.

The J2121A is especially suited to high power applications such as those associated with military and satellite busses. It can be used with input bus voltages up to 400V and supply up to 20A at 1MHz. The line injector allows the input DC supply voltage to be modulated by the network analyzer source signal (oscillator). The J2121A line injector output is DC regulated and provides a fixed voltage drop of 700mV from the input bus voltage fed into the injector in addition to the AC modulation signal.

The J2121A can be connected to the power supply input under test and, depending on the test probe connection points, can be used to measure either PSRR or the power supply’s input impedance. The line injector can also be used to measure the impedance/inductance of an inductor under bias.

While a current probe can be used as part of a test setup, the J2121A includes a current sense monitor output that can be connected to the VNA.

  Line Injector Comparison - J2121A vs. J2120A
J2121A supports much higher voltage and current applications
J2120A has ultra-low noise output, 50V/5A max 10MHz bandwidth, passive, variable
voltage drop(1.5V-3.5V) based on the load impedance
J2120A favors PSMR and low current, low voltage, PSRR measurement applications
The J2121A has a much higher voltage range, much higher current rating and integrated
Hall current monitor
The J2121A favors high voltage, high current PSRR testing and DC/DC and Inductor
impedance measurement
  Product Contents
J2121A High Power Line Injector * 1 pcs
1 ohm Calibration Fixture * 1 pcs
J2171A 200mA Low Noise Power Supply * 1 pcs
  Detailed Specifications:
Characteristic Typical Units
Maximum DC Input Voltage 400 VDC
Maximum Continuous Current 20 A
Typical Input-Output Voltage Drop 0.70 VDC
Modulation Input Impedance 50 ohms
Output Signal Bandwidth 100 ~ 1M Hz
Current Monitor Bandwidth (THRU CAL) DC ~ 1M dBm
Current Monitor Scale(AC) 100 mV/A
Current Monitor Termination Impedance 50 or 1M ohms
Max Current Monitor DC Offset 100 mV
Recommended Injection Signal 6 dBm
Temperature Range 0 ~ 50 °C
Maximum Altitude 6000 Ft
Bus Voltage: Plus and minus, standard banana jacks female
Signal Modulation: BNC
Power: J2171A proprietary connector, cable and power supply included
Voltage Output: Plus and minus, standard banana jacks female
Isolated Current Sense Monitor: BNC
To avoid equipment damage and/or severe injuries or death ensure that the absolute maximum ratings are observed and not exceeded at all times.
Measurement of PSRR
Measurement of DC Bias
Measurement of DC-DC Converter Input Impedance Testing



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