Triplett SLM400 User manual

User Manual

SLM400

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.



Operating Temperature: 0 to 40oC (32 to 104oF)

Maintenance and Cleaning

Repair or servicing not covered in this manual should only be

performed by qualified personnel.



Periodically wipe the case with a dry cloth. Do not use abrasives or

solvents.



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. Use the supplied windscreen to cover the

microphone when applicable.

2. Calibrate the instrument before each use if possible. Especially if the

meter has not been used for a long period of time.

3. Do not store or operate the instrument in areas of high temperature or

humidity.

4. Keep meter and microphone dry.

5. Avoid severe vibration.

6. Remove the battery when the meter is to be stored for long periods of

time.

7. Min:sec or Hour: min Display

Operation

1. Power the meter by pressing the

power button. The meter will begin displaying sound level

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. For measurements in the

65 to 100dB region either range can be used.

‘A’ and ‘C’ Frequency Weighting

Use the ‘A/C’ button to select ‘A’ or ‘C’ frequency weighting. With ‘A’

weighting selected, the frequency response of the meter is similar to the

response of the human ear. ‘A’ weighting is commonly used for

environmental or hearing conservation programs such as OSHA

regulatory testing and noise ordinance law enforcement. ‘C’ weighting is

a much flatter response and is suitable for the sound level analysis of

machines, engines, etc.

Most noise measurements are performed using 'A' Weighting

and SLOW Response. ‘FAST’ and ‘SLOW’ Response Time

Use the ‘F/C’ button to select FAST (125 ms) or SLOW (1 second)

response time. Select FAST to capture noise peaks and noises that occur

very quickly. Select the SLOW response to monitor a sound source that

has a consistent noise level or to average quickly changing levels.

Select Slow response for most applications.

‘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. Select MAX HOLD by

momentarily pressing the MAX HOLD button. The meter displays the MAX

icon when in the MAX HOLD mode. Press the MAX HOLD button again to

exit this mode (the MAX indicator will switch off).

DATA HOLD

To freeze a displayed reading, press and hold the MAX HOLD button until

the MAX and HOLD display icons appear. To release the display and

return to the normal operating mode, press and hold the MAX HOLD

button until the MAX and HOLD icons switch off.

Backlight button

The LCD is equipped with backlighting for easier viewing, especially in dimly

lit areas. Press the backlight button to turn the backlight on. Press again to

turn the backlight off. The backlight does not have an automatic power down

function; judicious use will conserve battery life.

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

4. Put the meter in the LOW range

5. Adjust the ‘C (Lo)’ potentiometer for a display of

94.0 dB

6. Put the meter in the HIGH range

7. Adjust the ‘C (HI)’ potentiometer for a display of

94.0 dB

Battery Replacement

When the low battery icon BAT appears on the LCD replace the 9V

battery as soon as possible. The battery compartment cover is located on

the rear of the meter. Remove the Phillips screw to loosen the cover.

Slide the battery compartment cover off, change the battery, and replace

the compartment cover.

You, as the end user, are legally bound (Battery ordinance) to

return all used batteries and accumulators; disposal in the

household garbage is prohibited!

You can hand over your used batteries / accumulators at

collection points in your community or wherever batteries /

accumulators are sold

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

Meets Type 2 ANSI S1.4-1983, IEC 60651,

EN60651

Maximum Hold decay

time

<1dB / 3min

Response time

Fast: 125 milliseconds / Slow: 1 second

Calibration source

required

1KHz sine wave @ 94dB

Power

9V Battery

Battery life

50 hours (typical); low battery indicator alerts

user

Automatic power off

After approx. 15 minutes of inactivity

Operating temperature

0 to 40oC (32 to 104oF)

Operating humidity

10 to 90% RH

Storage temperature

-10 to 60oC (14 to 140oF)

Storage humidity

10 to 75% RH

Dimensions/weight

240 x 68 x 25mm (9.45 x 2.68 x 1”) /210g

(6.75oz)

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. This warranty does not apply to any of our products which have been

repaired or altered by unauthorized persons in any way or purchased from unauthorized

distributors so as, in our sole judgment, to injure their stability or reliability, or which have

been subject to misuse, abuse, misapplication, negligence, accident or which have had the

serial numbers altered, defaced, or removed. Accessories, including batteries are not

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