Jewell Instruments ECG Specifications

ECG

eCompass Series

Making Sense out of Motion…

If your compass application involves vibration,
acceleration, uneven terrain, or rough seas, you will
find the Jewell Instruments ECG Series to be an
uncompromising solution that will outperform rival
units costing considerably more. The ECG provides
remarkably accurate heading, pitch, and roll in
dynamic conditions. It all starts with a precision 3-axis
solid-state magnetometer. Two angular rate gyros
independently stabilize pitch and roll. They augment
a dual-axis, electrolytic tilt sensor that provides
precise tilt measurements in static environments. Two
sets of independent filters, one set for pitch and one
for roll, combine gyro and electrolytic sensor
measurements to provide the best available tilt
measurements.

The recommended applications for the ECG are
manned and unmanned vehicles, robotics, weather
buoys, antenna positioning, platform stabilization,
marine navigation, excavation machinery, and
irrigation equipment.

minimizes axis coupling and corrects for gyro drift
errors.

The ECG is compatible with Jewell’s ECS and ECX
series. The ECG board fits in the same enclosure and
has the same mounting hole pattern and connectors.
Identical NMEA sentences are available, and the ECG
version includes additional binary data output for
temperature and diagnostics.

The ECG comes with an enhanced version of Jewell’s
demonstration software that is backward compatible
with the ECS and ECX. The magnetic calibration
procedure required upon installation is identical, as
are cabling and power requirements.

For more information, pricing, and availability, please
call Jewell Instruments or e-mail

[e-mail].

Rev B

The exceptional performance of the ECG is achieved
by first calibrating all sensors over a wide temperature
range. Then Jewell Instruments aligns the magnetic,
tilt, and rate sensors to a common set of axes using
precision calibration equipment capable of measuring
angles as small as 0.001º. This alignment procedure,
driven by our proprietary calibration routines,

Features

♦ Exceptional Dynamic Performance

⇒ Heading within 3° typical for rates < 250 °/sec
⇒ Pitch and roll within 0.3° for rates < 250 °/sec

♦ High Static Accuracy

⇒ Heading within 0.5° or better
⇒ Tilt within 0.2° or better

♦ Wide Operating Range

⇒ ±42° Pitch and Roll
⇒ ±80° Dip angle range
⇒ Temperature -40° to 105°C
⇒ Local Hard Iron to ±1.5 Gauss

♦ Precise Calibration

⇒ Gyros calibrated for offset and gain from -40° to 85°C
⇒ Rate sensors calibrated and aligned to

magnetometer and tilt sensor

⇒ Cross-axis error nearly eliminated on gyros and

magnetometer

♦ Single Supply Operation

⇒ 6 to 45V unregulated DC or
⇒ 5V regulated DC
⇒ Thermal overload and reverse polarity protection

Jewell Instruments LLC 850 Perimeter Road, Manchester, NH 03103

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

♦ Fast Response

⇒ 28 readings per second
⇒ Wake from standby in 50 msec

♦ Low Power

⇒ 30 mA operating
⇒ 10 mA sample
⇒ 5 mA standby

♦ Wide Selection of ASCII or Binary Output data

⇒ Heading, pitch, and roll
⇒ Magnetometer X, Y, and Z
⇒ Temperature, input voltage, and dip angle
⇒ Output ASCII or binary
⇒ Horizontal X and Y magnetic field strength
⇒ Raw and conditioned gyro data

♦ Two independent serial channels

⇒ Full-duplex RS-232 for the external RJ12
⇒ Either RS-232 or full-duplex RS-485 for the internal

connector

♦ In-System Configuration and Test

⇒ Laptop can be connected while unit operates in situ
⇒ Perform hard and soft iron calibration
⇒ Monitor outputs and change user-definable settings

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ECG

eCompass Series

Making Sense out of Motion…

Specifications

Heading Performance

Parameter Value Conditions

Accuracy1 ± 0.5° rms Static, Tilt < 35° Dip < 60°

Repeatability
Response time 36 msec Minimum, no filter
Dip Angle Range
Tilt Range
Update rate 28 per second

1

May require calibration after installation to eliminate effect of local magnetic field

Pitch and Roll Performance

Parameter Value Conditions

Accuracy
Repeatability
Range
Settling time 0.5 sec Gyros enabled

Electrical

Parameter Value Conditions

Supply Current
30 mA operating typical
10 mA sample typical

2 mA standby typical

Supply Voltage (VDD)
6 – 45 Vdc unregulated 4.9 Vdc min

Environmental

Parameter Value

Operating Temp -40° to 105°C

Storage Temperature -50° to 150°C

Humidity 0 to 90%

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

Rev B

± 3.0° rms

± 0.3°

± 80°
± 40°

± 0.3°
± 0.2°

± 42°

Below values are the same color

Below values are the same color

5.0 Vdc regulated

Dynamic, rate < 250°/sec

Jewell Instruments LLC 850 Perimeter Road, Manchester, NH 03103

Static, no filter

Factory calibrated

No filter

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ECG

eCompass Series

Making Sense out of Motion…

Mechanical

6 pin RJ12 modular jack

Interface

*Specifications subject to change without notice on account of continued product development

Enclosure Material

PCB Size 1.8"W x 3.0"L x 0.6"H
PCB Mounting 4 #4 screws, 1.4" x 2.2" spacing
Weight

Connectors 8 pin, single-row, 0.1" friction header

Signal type RS-232 and RS-485
Baud rate 2400, 4800, 9600, 19200, 38400, or 57600 bps
Character Format 8 data, no parity, 1 stop
Input Buffer Size 110 characters
Output Buffer Size 110 characters
Output Format NMEA 0183 and binary
Output Data Rate 1 to 1650 sentences per minute
Operating Modes Continuous or sample
Angle Units Degrees, mils, radians, 16-bit integer

Plastic Enclosure (P Option): (ABS) Flame Retardant UL94 VO

Aluminum Enclosure (A Option): Diecast Aluminum Alloy (Type 360.1)

Plastic Enclosure (P Option): 3.2 oz. (90.7 grams)

Aluminum Enclosure (A Option): 7.2 oz. (204.1 grams)

How to Order

Rev B

Jewell Instruments LLC 850 Perimeter Road, Manchester, NH 03103

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

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