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SC11 Basic System Product Description
There was a time when conducting accurate site surveys used to involve a mass
of complex, bulky and difficult-to-use equipment. Based on a laptop computer and operating under
Windows 98/Me/NT/2000/XP, the SC11 has revolutionised site surveys. It is a fully portable
tool for measurement and analysis of ambient AC magnetic fields, vibrations and acoustic levels
in one compact system. The system is based on a laptop personal computer, a three axis magnetic
field sensor, an accelerometer and a sound level meter. An optional flux gate magnetometer measures
DC magnetic fields. There is also the ability to attach extra sensors if so desired.
The software suite consists of three virtual instruments, an oscilloscope, a
spectrum analyser and a chart recorder. In each case the information is displayed graphically on
the laptop screen and the data can be exported to spreadsheet programs for further processing and
hard copies can be made on industry standard printers.
The SC11 has four measurement channels, three assigned to the axes of the
magnetic field sensor and one auxiliary. The auxiliary channel is designed to be driven from the
accelerometer, the sound level meter, the magnetometer or other signals such as the video output
of an SEM running in spot mode.
The SC11 is designed to be fully portable, fitting neatly into a carrying case
which is supplied. The system is powered from the laptop so that operation without a main power
connection is possible. The sound level meter and magnetometer have their own batteries. The
complete system is accurate, easy to operate with a minimum of training and produces user friendly
results.
Hardware
Laptop computer
The laptop computer is optionally supplied by Spicer Consulting with all the software
pre-installed. Alternatively you may install the software on your own laptop PC. If desired,
Spicer Consulting can install the system on your own computer. The minimum requirement for the
computer is a 700 MHz Pentium with 64 MB RAM, 100 MB free hard disc, CD-ROM, 3½in floppy disc
drive and PCMCIA slot.
Magnetic Field Sensor
The three axis magnetic field sensor is derived from the Spicer Consulting SC12 range of field
cancelling systems. The sensor has a magnetic field measurement range of 80 mG pk-pk with a
bandwidth of 1 Hz to 5 kHz and a noise limit of 20 uG pk-pk.
Sound Level Meter
The sound level meter supplied is a Techcessories model 33-2050 for general purpose sound
measurements. It can measure from 50 to 126 dBA or dBC on its internal meter.
Accelerometer
The accelerometer supplied is a Wilcoxon Research model 731A, with a measurement range of
200 mg's pk-pk and a bandwidth of 0.1 Hz to 500 Hz in this system. The accelerometer is suitable
for the measurement of extremely low level vibrations. The accelerometer measures along one
independent axis.
The accelerometer can be rotated to measure three orthogonal axes while
standing on a horizontal plane.
Flux Gate Magnetometer
The optional flux gate magnetomer is a uMAG-01N from MEDA. It measures one axis magnetic fields
from DC to 100 Hz, with a maximum range of ±2000 mG and a meter resolution of 0.01 mG on the most
sensitive 20 mG range.
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