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Chapter 3
3.2. Eight Channel Models
The Minimate Plus eight channel monitor offers a second set of four channels for compliance
monitoring. A second microphone and a second standard transducer may be connected to these
channels. For clarity, the number two (2) follows all references to the second microphone or
second standard transducer throughout this manual.
For most monitoring operations, setting up and using the monitor is the same for both four and
eight channel models. Where differences do occur, this manual specifies both the four and eight
channel procedures.
Note: When using only four channels on eight channel monitors, always connect the sensors to
channels one to four (CH 1–4).
3.3. Installing the Minimate Plus or the Standard
Transducer
The following sections apply to the Minimate Plus with a built–in transducer and the standard
transducer as supplied by Instantel. The sections illustrate installation procedures recommended by
Instantel. Your particular monitoring activities may employ one or a combination of all of the
following procedures. You may even devise your own method for a specific application. It is
important for you to couple the Minimate Plus or standard transducer securely to ensure reliable
monitoring results.
The following sections provide example installation methods. For wall and ceiling installations,
refer to the Reference chapter. Other methods may be used if they satisfy the following
requirements.
1. Arrow Pointed in Direction of the Event
The arrow on the side of the Minimate Plus or on the top of the standard transducer must be
pointed in the direction of the event to ensure the geophone sensors, located inside the Minimate
Plus and standard transducer, remain in their natural axis.
2. Level Installation
The Minimate Plus or the standard transducer must be installed level. For the Minimate Plus, a
fastening plate is available. For the standard transducer, a leveling plate is available. Both the
fastening plate and the leveling plate have three leveling feet and an integrated bubble level
indicator.
3. Securely Coupled to the Surrounding Surface
The Minimate Plus or the standard transducer must be securely coupled to the surrounding
surface. The surface must be compact with no loose or soft material close to the Minimate Plus or
the standard transducer. Coupling is critical for reliable and accurate monitoring results.
Insufficient coupling allows the Minimate Plus or the standard transducer to move independently
of the surrounding surface resulting in distorted, often higher, monitoring results.
Coupling methods depend upon the type of surface with no single method applicable to all types.
It is up to you to check the surface and mount the Minimate Plus or the standard transducer with
sufficient coupling to ensure reliable monitoring results.
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Minimate Plus Operator Manual