Jewell Instruments 520 Specifications

Model 520 Geodetic Platform Tiltmeter

Jewell Instruments LLC, 850 Perimeter Road, Manchester, NH 03103

[e-mail] • www.jewellinstruments.com • Tel [phone]

(Biaxial)

Our top performer, Model 520 is designed
for projects demanding the maximum in
resolution and stability. Applications
include leveling and alignment of
antennae, measurement of earth tides
and crustal deformation,

volcano monitoring and telescope
pointing. With resolution smaller than 10
nanoradians, Model 520 is excellent for
use in all static applications, or as a
sensitive low-frequency accelerometer.

that the sensor behaves as a precision
voltage divider, capable of detecting even
the smallest rotational movements. Hand
assembly and use of the highest-quality,
low-noise components result in unrivaled
sensitivity, stability and dynamic range.

Connections to external power and
recorders are made via a highly reliable
10-position terminal strip. The tiltmeter,
cable and switch box are sealed
throughout for operation in damp
environments.

For the ultimate in quality and unequaled
performance, invest in the most sensitive
production tiltmeter in the world today - a
Model 520 Geodetic Platform Tiltmeter.

Model 520 Geodetic Platform Tiltmeter

MEASURE NANORADIANS
WITH UNRIVALED EASE AND
PRECISION

Model 520 uses the vertical gravity vector
as its stable reference. Electrolytic tilt
sensors measure rotations in two
orthogonal vertical planes. The sensors
can be described as electronic spirit levels,
each containing a bubble in a conductive
liquid. As the instrument tilts, platinum
electrodes in the sensor walls move into or
out of the bubble and the area covered by
liquid changes. This effect changes the
electrical resistance between opposing
electrodes so

Low-noise components are used throughout

PRACTICAL AND PROVEN

Model 520 is not only sensitive, it is field­proven and simple to use. Each system
consists of the tiltmeter itself, a rugged
fiberglass switch box and a 3-meter
interconnect cable. Leveling and user
calibration of the tiltmeter are performed
with built-in micrometer or worm gear legs.
Three different scale factors and two low­pass Butterworth filters are user-selected
with switches in the switch box.

Underground tiltmeter tes ting vault

Jewell Instruments LLC, 850 Perimeter Road, Manchester, NH 03103

[e-mail] • www.jewellinstruments.com • Tel [phone]