The Picotest J2101A is a wideband injection transformer that enables precise test signal injection into control loops without significantly degrading device performance. It functions as a critical interface between network analyzers and circuits under test, allowing engineers to measure loop response, gain, and phase margin in power supplies, DC-DC converters, and voltage regulators. The transformer provides galvanic isolation and low-distortion signal transmission across a wide frequency range, making it suitable for stability analysis in both low-frequency offline supplies and high-speed modern regulators.
Technical Specifications
Frequency Range: 10 Hz to 45 MHz (5 Ω termination); 60 Hz to 45 MHz (50 Ω termination)
Electrical Characteristics:
• Transformer ratio: 1:1
• Termination impedance: 5 Ω
• Isolation voltage: 600 V DC
• Isolation capacitance: 150 pF @ 1 kHz
• DC resistance: 0.55 Ω
• DC current handling: 10 mA
Connectors: BNC input socket; banana jack outputs
Physical: 109.22 × 89.66 × 50.80 mm; 0.225 kg
Operating Environment: 0°C to 50°C; maximum altitude 6000 ft
– Key Features
• Low distortion for precision measurements and accurate loop characterization
• Integrated attenuation for small-signal analysis
• 600 V galvanic isolation suitable for high-voltage testing near 400 VDC circuits such as Power Factor Correctors
• Minimal impedance loading on control loops when terminated into 5 Ω
• Wideband performance from DC transient response through RF control loops
– Typical Applications
• Power supply stability and control loop analysis
• DC-DC converter characterization
• Voltage regulator frequency response testing
• Power Factor Corrector (PFC) circuit evaluation
– Compatibility & Integration
The J2101A interfaces with network analyzers from OMICRON Lab, Agilent, Venable, and Ridley. It also works with oscilloscopes equipped with Frequency Response Analysis (FRA) capabilities and spectrum analyzers.
