Extech SL355 Sound level-measuring apparatus, Noise-measuring apparatus SL355 ユーザーズマニュアル

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                                                    SL355-EU-EN V1.5   6/13 

1.  Power the instrument by momentarily pressing the power/menu button at the upper left side of 

the keypad. 

2.  When the unit is turned on, the model number (355) appears briefly on the left side of the LCD 

and the firmware version (1.1, for example) appears on the right side. 

3.  The meter defaults to the SLM mode (

 icon is shown) where the main display indicates the 

sound pressure level (SPL) in db, the A/C frequency weighting setting, the F/S response time 
setting, and the battery status icon (an up or down arrow will be 
visible if the current reading is above or below the selected range 
respectively). See screen shot diagram. 

4.  If the meter will not switch on, check that the batteries are installed 

and are fresh. 

5.  To turn the meter OFF, press and hold the power/menu button for 

three (3) seconds. 

6.  The SL355 can be used as a Sound Level Meter or a Dosimeter/Datalogger.   
7.  Note that the four arrow buttons are ‘smart’ navigation keys. For any given meter mode only the 

active arrow buttons appear on the LCD. 

1.  Slide the rear battery cover off of the meter. 

2.  Remove the old batteries (if applicable) and insert three (3) ‘AAA’ 1.5V 

batteries. Ensure that the battery orientation and polarity are correct. Do 
not mix fresh and partially used batteries. 

3.  Carefully re-assemble the meter before use. 

 

The end user is legally bound (EU Battery ordinance) to return all used batteries, 
disposal in the household garbage is prohibited! Bring used batteries / accumulators 
to collection points in your community or wherever batteries / accumulators are sold! 
Disposal: Follow the valid legal stipulations in respect of the disposal of the device at 
the end of its lifecycle 

The battery status icon appears as empty when the battery is depleted. The battery symbol 
indicates the remaining capacity in numbers of bars or segments, as follows: 

>84%

>65%

>25%

>11%

0%

 

Insert the microphone plug into the connector on the top of the meter as shown in 
accompanying diagram. Turn clockwise to secure in place; be careful not to over-
tighten.