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LM-3S voltages

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ON28:
Hello all--

Tried to find this in the archive but asking the group. What are the minimum, nominal and max voltages for the LM-3S in HO? I run RP on a layout wired for NCE. How does this jibe with NMRA S9.1 'Electrical Standards for Digital Command Control', April 9, 2021? Also, does a voltmeter provide a true reading of DCC track voltage, or do I need a RRampMeter by DCC Specialties? Thanks!

NMRA
Table 2.3 – Power transmission and amplitude limit parameters (Page 5)
Voltage limits for track HO/S/O scales for power station
8.5 volts minimum
15 volts 'nominal'
22 volts maximum

William Brillinger:
From the LM-3S instruction page:

https://ringengineering.com/RailPro/Documents/LM-3Instructions.pdf

WARNING: Maximum voltage is 18 Volts. Only
power your LM-3 module with a Ring Engineering
Inc. RailPro Power Supply designed for the LM-3 or
a DCC power supply that only has the signal that is
described in NMRA DCC standards S-9.1 and S-9.2

ON28:
Thanks, Bill, I missed that!

gregeusa:
So a RRAMPMETER will give you true DCC voltage, i.e. when rectified to dc, that is the result, i.e. true dcc voltage of 18 volts through a full wave bridge with a tiny bit of noise filtering will be 18 volts DC.

But most "ordinary" meters on AC setting will not give you true DCC voltage.

You can hook a full wave bridge to your tracks, and then put a 0.1 mfd disk cap across the = and + and then read with a DC voltmeter. That will also tell you what the voltage is.

NCE systems (the 5 and 10 amp powerpro) are USUALLY about 16v DCC from the factory... but trust no one!

Greg

ON28:
So what is the measurement differencde in track voltage between a multimeter and a RRampmeter?

I tried adjusting the voltage on my NCE base station following a YouTube video. For whatever reason some insulation began to smoke so I shut it down. My LM-equipped locos usually show voltage of 13-13.2v when not moving.

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