Archive for July 23rd, 2018
Tek A6302 Current Probe Derating
Posted by Ed in Electronics Workbench, Science on 2018-07-23
Most currents around here come in tens-of-milliamps, maybe a few hundred, tops, but it’s worth noting some curves from the Tektronix AM503 current amplifier manual for A6302 Hall effect probes:
Tek A6302 Calibration Setup
The maximum current drops from 20 A for frequencies above 20 kHz:
Tek A6302 Current Probe – Max Current Frequency Derating
There’s a 100 A·μs pulse charge limit:
Tek A6302 Current Probe – Specified Operating Area
Because the probe is actually a pulse transformer, its internal termination imposes a (small) load on the input circuit:
Tek A6302 Current Probe – Insertion Impedance
The specs are 100 mΩ at 1 MHz and 500 mΩ at 50 MHz, which means the load is essentially zilch for the circuits and signals I deal with.
The Tektronix Probes for Current Measurement Systems has some useful descriptions.
Memo to Self: Should any of those limits matter, rethink what you’re doing.
An interesting story about the AM503 design from someone who lived through it.
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