Nady DSM-1X Digital SPL Meter manual

DSM-1X

Digital Sound Level Meter

Owner's Manual

Contents

1. Safety .......................................................................... 1

2. Applications and Features........................................... 2

3. Specifications ............................................................. 3

4. Meter Description ....................................................... 4

5. LCD Display Description ........................................... 5

6. Operation Instruction .................................................. 6

7. Calibration Procedure ................................................. 9

8. Basic Operation ........................................................ 10

9. Notes..........................................................................11

10. Accessories ............................................................. 12

1. Safety

Read the following safety information carefully before attempting to operate or service the meter.

Use the meter only as specified in this manual.

◆ Environment conditions:

Altitude: up to 2000 meters

RH≤90％（Non-Condensation）

Operating Temperature: -20～60℃

◆ Maintenance

Repairs or servicing not covered in this manual should only be performed by qualified personnel.

Wipe the unit with a dry soft cloth. Do not use abrasives or solvents on this instrument.

◆ Safety Symbol

Comply with EMC

2. Applications and Features

This SPL Meter is designed to meet the requirements of safety engineers, health personnel , industrial safety offices and sound quality control in various environments such as factories, schools, construction sites, recording studios, etc.

◆ Comply with IEC61672-1 CLASS2 Standard

◆ Max/Min/Data Hold

◆ Over / Under range indication

◆ A & C Weighting

◆ FAST & SLOW response

3. Specifications

Applied standard IEC61672-1 CLASS2

Frequency range

Dynamic range

Measuring level range

Accuracy

31.5Hz～8kHz

50dB

Lo：30dB～80dB Med：50dB～100dB

Hi：80dB～130dB Auto：30dB～130dB

±1.4dB

Time weighting

Microphone

FAST (125ms); SLOW ( 1s )

1/2 inch electret condenser microphone

Display 3½ digits LCD display with a resolution of 0.1dB

Frequency weighting A & C

Data update

Auto power off

2 times/sec

Meter automatically shuts down after approx. 15 minutes inactivity.

One 9V battery, 006P or IEC 6F22 or NEDA 1604. Power supply

Battery life at least 30 hours

Operating conditions -20℃～60℃，10％RH～90％RH

Storage conditions

Weight

-20℃～60℃，10％RH～75％RH

178g

Dimension (L*W*H) 158*62*32mm

4. Meter Description

①Microphone ②LCD display

③Weighting A/C select button

④MAX/MIN button

⑤Level Range select button

⑥Response time FAST/SLOW select button

⑦Power ON/OFF button ⑧Battery Compartment

5. LCD Display Description

①Under-range icon

②MAX hold

③MIN hold

④Fast sampling time icon

⑤Slow sampling time icon

⑥Over-range icon

⑦Level range display

⑧Analog bar

⑨Measurement reading

⑩Battery icon

⑪Auto range icon

⑫Data hold icon

⑬dBC icon

⑭dBA icon

⑮Auto power off icon

6. Operation Instruction

(1) Power ON/OFF: Turn the meter on by pressing the " " button for 1 second. Turn the meter off by pressing and holding the " " button for approx. 3 seconds then release the button.

(2) Backlight

After turning the meter on, momentarily press the " " button, to turn the backlight on/off. The backlight will automatically turn off after approx. 30 seconds of inactivity.

(3) Frequency weighting A/C selection

Press the " " button to select A or C. dBA: Follows the frequency sensitivity of the human ear at low levels dBC: Follows the frequency sensitivity of the human ear at high levels

(4) FAST/SLOW selection

After turning the meter on, press “ response time:

” to select the desired

FAST: Fast sampling time measurement,1 time per 125ms.

SLOW: Slow sampling time measurement, 1 time per second.

(5) MAX/MIN

After turning the meter on, press the " " button for three seconds to enter MAX measurement, ‘MAX’ will appear on the

LCD and the captured maximum sound level will be displayed.

Press the key again, ‘MIN’ will appear on the LCD and the minimum sound level will be displayed. Hold the button for three seconds to exit MAX/MIN measurement mode.

(6) Data HOLD:

After turning the meter on, momentarily press the " " button.

The "HOLD" icon will appear on the LCD, which freezes the reading on the display. To exit Data Hold mode, press the button again.

(7) Level range selection:

Press the “ ” button, the level range will toggle between the different options:

Lo：30dB～80dB Med：50dB～100dB

Hi：80dB～130dB Auto：30dB～130dB

7. Calibration Procedure

(1) Select the following switch settings:

Frequency weighting: A

R es pon s e ti me: FAS T

Level r an ge: 5 0 ~ 100d B

(2) Insert the microphone housing carefully into the 1/2 inch insertion hole of the calibrator (94dB @ 1kHZ).

(3) Turn on the calibrator and adjust the CAL potentiometer until 94.0dB is displayed.

Note: Calibrator not included. Available from test instruments suppliers.

Screwdriver included to facilitate calibration.

NOTE: Our products are carefully calibrated before delivery.

Recommended recalibration cycle: 1 year.

8. Basic Operation

(1) Open the battery cover and install a 9-volt battery in the battery compartment.

(2) Turn on the power and select the desired level range.

(3) Select ‘dBA’ for low sound levels and ‘dBC’ for high sound levels.

(4) Select ‘FAST’ for short sound bursts and ‘SLOW’ for average sound level.

(5) Press the ‘ ’ button for measuring maximum and minimum noise level.

(6) Hold the meter in hand or let it stand in upright position on a table top. The best measuring distance is 1~1.5m away from the microphone to the sound source.

9. Notes

(1) Do not store or operate the meter in high temperature or humidity.

(2) Remove the battery when the meter is to be stored for long periods of time to avoid battery leakage.

(3) Wind blowing across the will bring unwanted noise. Use the supplied windscreen to cover the microphone when necessary.

(4) Keep microphone dry and avoid severe vibration.

(5) When the low battery icon " battery.

" appears, replace the meter's

10. Accessories

① Owner's manual

② Windscreen

③ Calibration screwdriver

④ 9V battery

⑤ Carrying pouch