iM4 in operation on the left and on the right with case open and microphone stowed inside.
Electronics module, showing display and user control buttons.
Display with backlight visible
Simple Operation
You won't need to reach for the manual each time you use this
system. Operation of the iM4 is easy, press the ON button and follow a few
simple menu prompts on the two line LCD display. The
backlit LCD display shows real time noise
levels during logging (like a regular SLM) and other operational
data like, current clock time, total survey duration, available MB of storage
and battery volts.
Ultra Compact
The mast and microphone now pack inside the case making transport and
storage easy. The mast is quick and easy to assemble and requires no tools.
USB Flash Drive
Survey data is stored directly onto a USB flash drive
so a download cable is NOT required, just unplug the thumb drive from the
iM4 and plug it into your PC.
Fast Sampling
The iM4 utilises a 32 bit RISC processor that samples noise levels on 3 different channels
(high, low, peak), each at about 200 samples per second.
Long Battery Life
Advanced power management hardware/software permits selective starting and
stopping of hardware resources as needed. Typical current drawn is only 55 to 60mA from the
main 12V battery. A survey duration of over 10 days on one battery
is possible and a month using
the full set of three internal batteries. To save weight you need only carry the number of
batteries required for the planned survey. For a one week survey one battery is
more than sufficient and the total weight of logger and battery is less than 9kg.
Type 1 or Type 2 Microphones
The iM4 is a Type 1 instrument, but can be fitted with either a Type 1 or
Type 2 microphone/preamplifier to reduce the instrument cost. The Type 2 unit
has a typical dynamic range of 30 to 118dB and the Type 1, 25 to 118dB.
Data Security
You don't need to be concerned about choosing the correct
statistical noise settings like 15 minute or 1 hour noise surveys,
this system gets all the data allowing you to select your survey
parameters after the noise survey. Other systems may lose
your data without warning if the internal battery goes flat, but
this system retains your data on non-volatile USB flash memory.
Continuous Noise Level Recording - Time History Mode
Ideal for identification and analysis of noise events. The
noise monitor can store YEARS of 0.1 second Leq's
on a 1G flash drive.
Comprehensive Data Tracking (CDT) System
The iM4 has a Comprehensive Data Tracking system to enhance
your quality control and data security. Each unit is aware of its
own serial number. All data files created by an iM4 are tagged
with the unit serial number to allow tracking back to the
originating unit and avoiding file duplication with another iM4
unit. Data files created by each iM4 are sequentially numbered
up to 9,999 to avoid the possibility of multiple data files with
the same name. Summary history text files are created in parallel
with the data files on the iM4 to record temperatures, meter overloads, and
any errors.
Complies with Standards
AS1259.1 (IEC 651) and AS1259.2 (IEC 804). For details refer to Technical
Specification and Calibration
Choice of Frequency Weighting
"A", "C" or LIN frequency weightings can be set by
internal jumpers. In addition a response time of Fast or Slow can be selected to
suit your application.
Video of iM4
An 8 minute video (DivX format, 75MB) of the iM4 being used is
available for download.
This download version offers the best clarity, but you will need a DivX
codec installed on your computer to view the video.
Alternatively a lower quality version may be found on YouTube at this LINK.
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