Hornby 9f Ringfield Continuity Testing

[Steamplug]

Tried testing my ringfield terminals after servicing the motor and was surprised to see continuity between the 2 terminals.

Reads around 17 ohms when tested just above the small dimple over the brush springs.

The connection is via the brush from the commutator as i removed the terminals and tested the springs/brushes directly to rule out continuity through the motor housing.

Question then is this normal as I’m looking to convert to DCC and don’t want to blow a chip due to a faulty motor.

 

Cheers

[Nimbus]

You're effectively measuring the armature resistance.

 

The Nim.

[bigherb]

You need to worry if you don't get a resistance, as said it is the resistance through the armature windings.

 

[DCB]

Are you sure it is worth wasting a chip on?    We withdrew all but a couple of tender drive locos because the traction tyres make the track so filthy.  

[Steamplug]

2 hours ago, DavidCBroad said:

Are you sure it is worth wasting a chip on?    We withdrew all but a couple of tender drive locos because the traction tyres make the track so filthy.  

Just a bit of an experiment really, I’ve got the Bachman version of the 9f for day to day running sessions.

[Steamplug]

Cheers for the feedback guys, I’ve now stopped worrying about continuity and correctly isolated the  brush holders from the pickups so will give it a go and see how I get on.