Introduction Thank you for selecting the Extech Instruments Model SL400. This device is shipped fully tested and calibrated and, with proper use, will provide years of reliable service. Please visit our website (www.extech.com) to check for the latest version of this User Guide, Product Updates, Software, and Customer Support. Safety CAUTION: Avoid taking measurements in humid or wet environments. WARNING: Ensure that the ambient humidity conditions are within those specified and referenced in the Environmental Conditions section. WARNING: Avoid taking measurements in the presence of: Explosive gases Combustible gases Steam Excessive dust CAUTION: Do not operate the instrument in ambient temperature and humidity conditions beyond those recommended and referenced in the Environmental Conditions section. ATTENTION: Keep the microphone dry and avoid severe vibration. ATTENTION: Wind blowing across the microphone can add extraneous noise. If the instrument is ...
10. ENTER Button 11. SET Button 12. Stop Button Display Description Battery Status Auto Power Off Enabled Pause 115dB indicator (SPL) Stop 140 dB indicator (Peak) 3 SL400‐en‐GB_V1.0 2/16 GlobalTestSupply www. .com nd Quality Products Online at: sales@GlobalTestSupply.co...
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C Weighting Z Weighting Fast response Slow Response Impulse Weighting Over Range Under Range Solid: Auto record standby; Flashing: Recording Start test time (begin) View recorded data Stop test time SET mode Test duration 4 SL400‐en‐GB_V1.0 2/16 GlobalTestSupply www. .com nd Quality Products Online at: sales@GlobalTestSupply.co...
Press the or button to change the test mode between NDM (Noise Dose Meter) and SLM (Sound Level Meter). Press the SET button to move to the next parameter or Press enter to exit set up mode. Auto Power Off Set Press the or button to enable or disable Auto Power Off Function. Auto Power Off will turn off the meter in 15 minutes if the meter is not recording data. Press the SET button to move to the next parameter or Press enter to exit set up mode. 5 SL400‐en‐GB_V1.0 2/16 GlobalTestSupply www. .com nd Quality Products Online at: sales@GlobalTestSupply.co...
Use the or button to select either Auto Recording set or Sampling time. Use the or button to enable or disable Auto record (On or Off) or to adjust the sampling time. The minimum sampling time (interval rate) is 1 reading per second. The maximum sampling time is 23 hours, 59 minutes, and 59 seconds. Press the SET button to move to the next parameter or Press enter to exit set up mode. Real Time Clock Set Press the or button to select the option to adjust the Real time clock (24 hour). Use the or button to adjust the time digits. Press the SET button to move to the next parameter or Press enter to exit set up mode. 6 SL400‐en‐GB_V1.0 2/16 GlobalTestSupply www. .com nd Quality Products Online at: sales@GlobalTestSupply.co...
94dB Offset Adjust (Calibration) See section on meter calibration before proceeding with this parameter. Press the SET button to move to the next parameter or Press enter to exit set up mode. Noise Standard Set Press the or button to select a NDM testing regulatory body abbreviation: OSHA, MSHS, DOD, ACGIH, ISO85, ISO90, and USER. Press the SET button to move to the next parameter or Press enter to exit set up mode. 7 SL400‐en‐GB_V1.0 2/16 GlobalTestSupply www. .com nd Quality Products Online at: sales@GlobalTestSupply.co...
High – 70 to 140dB Medium – 50 to 110dB Low ‐ 30 to 90dB Press the SET button to move to the next parameter or Press enter to exit set up mode. 8 SL400‐en‐GB_V1.0 2/16 GlobalTestSupply www. .com nd Quality Products Online at: sales@GlobalTestSupply.co...
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Calibration Automatic Mode Calibration Set the meter to SLM mode, A weighting, High range, and Slow. Attach a 94.0dB (1000Hz) sound calibrator to the microphone. Enter SET mode and go to the parameter 94ADJ. Press the Run key to start the automatic offset routine and wait for the flashing dB number to appear. Press the Enter key to save the entry and to get back to the measure window. The meter should now read 94.0dB (+/‐ 0.1dB). If the measured value does not equal 94.0 (+/‐ 0.1dB), run the 94ADJ routine again. Press the Enter key to save the entry and to get back to the measure window. 9 SL400‐en‐GB_V1.0 2/16 GlobalTestSupply www. .com nd Quality Products Online at: sales@GlobalTestSupply.co...
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Manual Mode Calibration Set the meter to SLM mode, A weighting, High range, and Slow. Attach a 94.0dB (1000Hz) sound calibrator to the microphone and wait for about 1 minute and note the sound value on the display. Write down the value. Calculate the value of the offset from the displayed value to the sourced noise level. In this example the value is +1.3 (94.0dB sourced, and 92.7dB displayed) Enter Set mode and go to the parameter 94ADJ. Using the Up and down arrows set the offset according to the offset calculated. In this example – set 94ADJ to 1.3 Press the Enter key to save the entry and to get back to the measure window. The meter should now read 94.0dB (+/‐ 0.1dB). 10 SL400‐en‐GB_V1.0 2/16 GlobalTestSupply www. .com nd Quality Products Online at: sales@GlobalTestSupply.co...
to exit. Press the button to scroll through the available test functions for this mode: SPL, Leq, SEL, and PKMAX. Press the button to begin testing. Press the button again to pause testing. If the reading exceeds the high testing range, the LCD display will show . If the reading is below the low testing range, the LCD display will show . The Leq integral time is the same value as the sampling time setting. When the sampling time is set to zero, the integration time continues until the user exits the mode. Press the button to stop the test. Caution: Wind blowing across the microphone can add extraneous noise. When there is wind present higher than 10 m/s, the windscreen must be used to prevent undesirable signals. Keep the microphone dry and avoid severe vibrations. Note: setup of the meter can also be performed through the software. 11 SL400‐en‐GB_V1.0 2/16 GlobalTestSupply www. .com nd Quality Products Online at: sales@GlobalTestSupply.co...
When the bottom left of the LCD displays FULL, the internal memory is full. The auto function cannot be used until the data stored in memory is downloaded and cleared. Note: The memory can only be downloaded and erased using the software. Manual ‐ Single Data Point Recording Press the button to store the displayed reading. The symbol will flash. The bottom left of LCD display will show WRITE, indicating that the single data point was written to the meter’s internal memory. Note: Single Data Point recording does not function while the meter is in Auto Data Recording mode. To view manually recorded data, see the heading View Logged Sound Level Readings or View Logged DOSE readings. 12 SL400‐en‐GB_V1.0 2/16 GlobalTestSupply www. .com nd Quality Products Online at: sales@GlobalTestSupply.co...
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button again to pause testing. Press to stop testing. Press the button to scroll the available test options: SPL, Dose%, LPMAX, LPMIN, PKMAX, LEQ, SEL, LEP8, TWA8, LVAG, LN5%, LN10%, LN50%, LN90%, and LN95%. Press the button to view the start test time and date. Press the button to change the view from time to date and back to the time display. The time format is HH:MM:SS and the date format is YY‐MM‐DD. View Logged Sound Level Readings For Sound level readings, SLM must appear on the lower line. Press and hold the button for more than 1 sec to enter the viewing mode. Press the or button to scroll through the readings. Press the button to select the dose record information (Noise Dose Meter mode): Test mode, Start Time, Test duration, Total pause time, Test end time. Press the button to view the test start date, Press the button to view the test start time. The time format is HH:MM:SS and the date format is YY‐MM‐DD. Press and hold the button for more than 1 sec again to exit the logged data viewing mode. 13 SL400‐en‐GB_V1.0 2/16 GlobalTestSupply www. .com nd Quality Products Online at: sales@GlobalTestSupply.co...
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View Logged DOSE readings Note: It is best to view the DOSE data from the software interface. Refer to the SL400 Software Help guide. For DOSE noise readings, SLM must NOT appear on the lower line. If SLM appears on the bottom line, change the mode to NDM in Setup mode. Press and hold the button for more than 1 sec to enter the viewing mode. Press the or button to scroll through the Dose recording log. Press the button to select the dose test options: SPL, Dose%, LPMAX, LPMIN, PKMAX, LEQ, SEL, LEP8, TWA8, LVAG, LN5%, LN10%, LN50%, LN90%, and LN95%. Press the button to view the test start time, Press the button to view the test start date. The time format is HH:MM:SS and the date format is YY‐MM‐DD. Press and hold the button for more than 1 sec again to exit the logged data viewing mode. Graphic Window Mode Right‐click on the image and choose VIEW and uncheck Graphic Window mode for full view. 14 SL400‐en‐GB_V1.0 2/16 GlobalTestSupply www. .com nd Quality Products Online at: sales@GlobalTestSupply.co...
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Sound pressure level (SPL) Equivalent continuous level for the duration of the Leq LAFq measurement for A weighting Equivalent continuous level for the duration of the Leq LCFq measurement for C weighting Equivalent continuous level for the duration of the Leq LZFq measurement for Z weighting Frequency weighted sound exposure level for the duration of SEL LAE the measurement for A weighting Frequency weighted sound exposure level for the duration of SEL LCE the measurement for C weighting Frequency weighted sound exposure level for the duration of SEL LZE the measurement for Z weighting Peak Lcpeak Instantaneous C peak level 15 SL400‐en‐GB_V1.0 2/16 GlobalTestSupply www. .com nd Quality Products Online at: sales@GlobalTestSupply.co...
(AC or DC signals for research purposes, for example). Appendix A Dose Standards Selection list OSHA Occupational Safety and Health Administration (USA) MSHA Mine Safety and Health Administration (USA) DoD Department of Defense (USA) ACGIH American Conference of Governmental Industrial Hygienists (USA) ISO85 European ISO90 European User User defined parameters (settings can be saved to a file Import/Export) 16 SL400‐en‐GB_V1.0 2/16 GlobalTestSupply www. .com nd Quality Products Online at: sales@GlobalTestSupply.co...
50dB to 110dB (M) 70dB to 140dB (H) 41dB to 86dB (L) Primary RMS Range @1KHZ 55dB to 106dB (M) 75dB to 125dB (H) Maximum Peak C Weighting 90~143 dB Sound Level Measurement Dynamic Range 60 dB Accuracy ±1.4dB@94dB /1KHZ Internal memory MAX Datalogger data:10000(NDM); 999,999(SLM) Time Weighting Fast, Slow, Impulse Frequency Weighting A/C/Z Frequency Range 20Hz~8KHz <10 Second Starting Time Battery data 24 hour battery life; 9V Alkaline battery Dimensions 107(L) x 65(W) x 33(H) mm; 4.21(L) x 2.56(W) x 1.30(H) in. 17 SL400‐en‐GB_V1.0 2/16 GlobalTestSupply www. .com nd Quality Products Online at: sales@GlobalTestSupply.co...
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