[ANSS-netops] stepping noise in sensor

[Doug Given]

            We see the steps also. Note that the plot attached is from an
Episensor hooked up to a Basalt with not telemetry connected - so, at least
for this case, it's not the radio.

 

            This plot was produced by Bob Dollar working with Arnie Acosta.

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| Douglas Given             | Project Chief                       |
| U.S. Geological Survey    | S. California Earthquake Monitoring |
| Caltech Seismological Lab | (626)583-7812  FAX: (626)583-7827   |
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  _____  

From: anss-netops-bounces at geohazards.usgs.gov
[mailto:anss-netops-bounces at geohazards.usgs.gov] On Behalf Of Greg Steiner
Sent: Friday, February 26, 2010 8:22 AM
To: anss-netops at geohazards.usgs.gov
Subject: [ANSS-netops] stepping noise in sensor

 

Don,
After looking at your plots, I'm thinking that it is not RF getting into the
sensor and being rectified, but that it is changes in power supply voltage
to the sensor caused by the freewave transmitter being activated. put a
scope on your dc power line to the sensor, or try some realy big (10,000Uf
caps across the line. If it is realy stubborn you might want to use a 3
terminal regulator to supply power to the episensor. Let me know if this
helps, Ive seen that the episensor is very succeptible to passing through
power line disturbances. It seems like there are no internal regulators.
Greg

-- 



Greg Steiner

 

VLF Designs

1621 Bella Vista Dr.

Jackson, Mo. 63755

 

Ph: 573-204-1286

Fax:573-204-1286

Ph: 573-388-2117

 

Email: vlf at cablerocket.com

 

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