Current Tracer 547A

The HP 547A Current Tracer precisely locates low-impedance faults in digital circuits by Locating current sources or sinks. For example, on a bad node the Tracer can verify that the driver is functioning and also show where the problem is by tracing current flow to the source or sink causing the node to be stuck. The Tracer is designed to troubleshoot circuits carrying fast rise-time current pulses. The Tracer senses the magnetic field generated by these signals in the circuit and displays transitions, single pulses, and pulse trains using a simple one-light indicator. Because it is not voltage sensitive, the Tracer operates on all logic families having current pulses exceeding 1 mA, including CMOS, where even lightly loaded outputs can have up to 2 to 3 mA of instantaneous charging current.

Matching Instruments: HP 545A Logic Probe, HP 546A or HP 10526T Logic Pulser, HP548A or HP 10528A Logic Clip, HP 10529A Logic Comparator.

Here you find 392 models, 360 with images and 138 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Hewlett-Packard, (HP); Palo Alto, CA