Tektronix TCPA300 AC/DC Current Probe Amplifier

Product Description

The TCPA300 is a high‑performance current probe amplifier manufactured by Tektronix. It works in combination with TCP312A, TCP305A or TCP303 split‑core current probes, offering DC‑100 MHz measurement bandwidth. It supports automatic scaling and TEKPROBE / TekVPI oscilloscope interfaces. The amplifier accepts wide‑range 90–264 VAC mains power and features built‑in status LEDs for degauss, overload, open probe and termination warning. It is widely used in electronic laboratories and test benches as precision current measuring equipment and spare test hardware.

Product Functions

• Condition and amplify tiny current signals from matched TCP series split‑core probes for oscilloscope observation
• Precise AC and DC current measurement with low insertion impedance to minimize loading on the tested circuit
• Automatic current scaling and on‑screen amplitude readout on compatible Tektronix oscilloscopes
• Built‑in degauss function to eliminate DC offset drift and improve low‑current measurement accuracy
• Real‑time fault monitoring: probe disconnection, input overload, improper 50‑Ω termination and incompatible probe detection
• AC/DC coupling selectable for transient pulse, ripple and steady‑state current waveform capture
• Front‑panel indicator lights quickly notify operators of abnormal operating conditions during testing

Application Scenarios

• Power electronics R&D for switching power supply, inverter and motor drive current waveform analysis
• Electric vehicle, avionics and railway traction electronic circuit dynamic current testing
• Semiconductor, IGBT and MOSFET switching loss and transient surge current measurement
• Consumer electronics, LED driver and electronic ballast performance verification and failure analysis
• University laboratories, electronic maintenance workshops and automated production test stations
• Spare replacement and calibration upgrade of existing Tektronix TCP300 series current measurement systems

Common Problems

• Oscilloscope cannot detect the amplifier：faulty TEKPROBE cable, incompatible oscilloscope interface or power supply failure
• Excessive DC drift and inaccurate low‑current readings：regular degaussing not performed, probe contaminated or temperature drift
• Overload warning light keeps flashing：measured current exceeds probe rating or large transient surge appears
• Probe open alarm even after reconnection：cracked probe cable, broken sensor coil or loose connector pins
• Waveform noise increases obviously：missing 50‑Ω termination, poor shielding or ground loop interference
• Amplifier heats up abnormally：long‑term continuous overload operation, blocked ventilation grille or internal component aging
• Measurement data jumps randomly：loose split‑core jaw, uneven magnetic contact or external electromagnetic disturbance