Reply to "Adventures in TMCC & Legacy... Trying to master the 455Khz track signal. I've built the test car, and it is finally working.."

stan2004OGR Forum Member

cjack posted:
Anyway y'all had me confused.

The HF special in the 200uA DC-current mode has a 1k Ohm shunt or burden resistor. With no change in the circuit, they can switch the meter to DC-voltage mode which measures the voltage across 51k Ohms. Readings of 30-40 uAmps using the 200uA DC-current mode would instead be 1.5 - 2.0 Volts in the DC-voltage mode.

The reality as I see it is simple. It doesn't matter what units the meter is measuring (voltage, current, widgets, etc.); the readout gets larger and smaller proportional to the received 455 kHz signal. And all this occurs over a wide range making it a useful and remarkably inexpensive tool.

Yes, if I were doing it I'd prefer the Voltage measurement mode...but I'm not doing it. I'd say that ship has sailed and the standard has been set.

2/17/169:38 PM

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