David,
On mine, the high resistance coil is the sense coil (5k),
and the low resistance appears to be a calibration
coil.  The third pair was unconnected on my unit 
There are only 2 pair leading into the case, although 
there were 3 pair at the circular connector. If you're 
running a non-feedback arrangement, you can 
leave the low R coil disconnected.  

Jack Ivey

> -----Original Message-----
> From: David Saum [mailto:DSaum@.............
> Sent: Monday, January 28, 2002 3:51 PM
> To: psn-l@..............
> Subject: EV-17 wiring?
> 
> 
> Can anyone give me the wiring information
> for the EV-17 seismometer?  Mine has a cable
> the three pairs of output wires:
> 
> 1. pair in a green foil shied
> 
> 2. pair in a blue foil shield
> 
> 3. pair in a red foil shield
> 
> Pair 1 has a 5k ohm resistance
> and seems to give a pretty good
> signal.  The other pairs are much
> lower resistance.  Can I just leave
> the red (#3) and blue (#2) pairs
> unconnected?
> 
> Thanks,
> 
> Dave
> http://www.infiltec.com/seismo/
> 
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