Digi-Sense 20250-29 Instruction Manual
User Manual
Data Logging Sound Level Meter
with NIST-Traceable Calibration
Model 20250-29
THE STANDARD IN PRECISION MEASUREMENT
Introduction
The Digi-Sense Data Logging Sound Level Meter
(Model 20250-29) measures sound decibel levels for
noise certification and reduction applications. The meter
conforms to IEC61672-1 Class 2 standard. Advanced features include data Hold, Max/Min readings, low/medium/
high ranges, over and under range, and A and C weighting.
The unit offers Fast/Slow response, analog AD/DC outputs,
USB connectivity, data logging software, backlight display,
and automatic power-off. The instrument is fully tested and
calibrated to NIST-traceable standards. Careful use of
this meter will provide years of reliable service.
Unpacking
Check individual parts against the list of items below.
If anything is missing or damaged, please contact
your instrument supplier immediately.
1. Meter
2. Windscreen
3. Earphone plug, 3.5 mm
4. Screwdriver
5. Three AAA batteries
6. USB cable
7. Software
8. User manual
9. NIST-traceable calibration report with data
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Key Features
• Wide measurement ranges of 30 to 130 dB
• Precision accuracy of ±1.4 dB
• Meets IEC61672-1 Class 2 standard
• User selectable low/medium/high, and auto range
measurement levels
• A and C frequency weighting
• Fast and slow time weighting
• Memory of 32,700 readings
• Max/Min and Hold functions
• Over- and under-range indicator
• AC/DC analog outputs
• Data logging software with graphical display
• Download data via USB connectivity
• Large backlit LCD for easy reading
• Low-battery indicator
• Auto power-off after fifteen minutes of
nonuse to conserve battery power
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Meter Description
1. Windscreen
2. LCD
3. REC button
4. SETUP button
5. FAST/SLOW button
6. MAX/MIN button
7. LEVEL button
8. Backlight
9. A/C frequency weighting
10. HOLD button
11. Power on/off button
12. External DC 5V power
supply terminal
13. USB interface
14. AC/DC signal output
earphone outlet
15. Calibration potentiometer
16. Tripod mounting screw
17. Battery cover
18. Microphone
button
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Display Layout
1. Under-range icon
2. Over-range icon
3. Maximum hold icon
4. Minimum hold icon
5. Fast response icon
6. Slow response icon
7. Selected level range
8. Date and time symbols
9. Reading of sound level
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10. Auto power-off icon
11. Low-battery indication
12. Recording icon
13. Memory full icon
14. A-Weighting icon
(response to human sense)
15. C-Weighting icon
(response to machinery)
16. Auto level range selection
17. Data Hold function icon
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