User Manual SLM400-KIT Digital Sound Level Meter Introduction Congratulations on your purchase of the SLM400 Digital Sound Level Meter. This device is shipped fully tested and calibrated and, with proper use, will provide years of reliable service.
Safety Read the following safety information carefully before attempting to operate or service the meter. Use the meter only as specified in this manual; otherwise, the protection provided by the meter may be impaired. Environmental Conditions Altitude up to 2000 meters Relative Humidity: 90% max.
Meter Description 1. Microphone 2. 4-digit LCD Display 3. ON-OFF button 4. LCD Backlight button 5. Frequency weighting selection button 6. Response time selection button 7. Range selector button 1. Max Hold / Data Hold selector button 2. Battery compartment on rear 10. Calibration pots in battery compartment 11. Windscreen Measurement Considerations 1. Wind blowing across the microphone increases the noise measurement.
Operation 1. Power the meter by pressing the power button. The meter will begin displaying readings. If the LCD does not switch on, check the 9V battery located in the rear battery compartment. 1. Hold the meter in hand facing the microphone toward the source of the sound to be measured. 2. View the measurement on the meter’s LCD. An indication of OVER means that the measurement is out of range. Toggle the ‘Hi’ (65 to 130dB) and ‘Lo’ (35 to 100dB) measurement ranges using the HI/LO button.
‘Hi’ and ‘Lo’ Range Selections Use the ‘Hi/Lo’ button to select the appropriate range. If the measurement is in the range of 35 to 100 dB, use the ‘Lo’ range. If the measurement is between 65 and 130dB, use the ‘Hi’ range. For measurements between 65 and 100dB, either range can be used. If the display flashes the OVER icon, press the range button to toggle the range. MAX HOLD In this mode, the meter only updates the LCD when a higher reading than the one presently on the display is detected.
Calibration To calibrate the SLM400 an external calibrator that can provide a 94.0dB signal at 1 kHz is required in addition to a small screw-driver. 1. Open the battery compartment and locate the two calibration potentiometers behind the 9V battery (see diagram) 1. Put the meter in the ‘C’ weighting mode 2. Put the meter in the ‘FAST’ response mode 3. Place the SLM400 microphone into the calibrator. Set the calibrator to output a 1kHz sine wave @ 94dB Put the meter in the LOW range 4. 5.
Specifications Display 4-digit (4000 count) backlit LCD Display update rate 0.5 seconds Microphone 0.5” Electret condensor Measurement Bandwidth 31.5Hz to 8KHz Dynamic range 65dB Measurement Range 35 to 130dB (Low: 35 to 100; High: 65 to 130dB) Frequency weighting ‘A’ and ‘C’ (selectable) Accuracy / Resolution ± 1.5dB (under reference conditions) / 0.1dB Standards IEC 61672-1 type 2, ANSI S1.
Warranty Information Triplett / Jewell Instruments extends the following warranty to the original purchaser of these goods for use. Triplett warrants to the original purchaser for use that the products sold by it will be free from defects in workmanship and material for a period of (1) one year from the date of purchase.
