1.2.8
1 - 13
1.2.8 Disturbance by Sound Waves
Sound waves (vibrations of air) adversely affect the Model S-3400N regardless of their frequency
and may cause image trouble. To prevent this, confirm before installation that equipment that
may cause a sonic disturbance is not located in the vicinity of the S-3400N. If such equipment
exists, then check for noise level.
In general, as the frequency of noise increases, the sound pressure level decreases, and the
frequency of noise varies depending on the cause of noise. It is therefore necessary to carry out
noise frequency analysis at the installation location of the S-3400N SEM to check the degree of
noise (effective factor) in each case. If the frequency of noise matches the resonance frequency
of the system, a frequency of less than 150 Hz can cause image faults if the noise level is
greater than 58 dB.
Table 1.2-4 Allowable Sound Pressure Level (C characteristics)
Frequency: f (Hz) Allowable Noise Level (Type I) Allowable Noise Level (Type II)
f ≤ 150 70 dB max. 75 dB max.
150 ≤ f ≤ 800 60 dB max. 65 dB max.
800 ≤ f ≤ 2000 70 dB max. 65 dB max.
NOTICE: The representative value at the noise level where this instrument is generated is
recorded below.
Normal operation : 42 dB
Evacuation after specimen exchange : 50 dB
Compressor operation : 57 to 60 dB (use standard compressor)
* Operator's position in normal use. Exclude Buzzer sound. Condition with low noise
other than instrument.
1.2.9 Electro-Magnetic Compatibility
This instrument has suited class A of EN standard EN61326 (First edition 2002-02). Do not set
up this instrument near the equipment that is influenced data by the electromagnetic radiation
noise in this standard allowance value. Moreover, this instrument might be influenced data by
the electromagnetic radiation noise, and cause the malfunction of the instrument. Manage in
the room where this instrument was set up so as not to bring the following electric equipment * in.
*: Equipment that generates electric wave like specific, small electric power equipment such as
cellular phone, transceiver and cordless phone.
1.2.10 Site Requirements
(1) Required floor space
A minimum area of 2.5 m x 2.2 m is required.
