884-2 & 886-2 Sound/Noise
Measuring Systems
884-2 Sound Level Meter
• Rugged solid-state reliability
• "A" weighting
• Battery Operated
886-2 Multi Weight Sound Level Meter
• Rugged solid-state reliability
• "A" , “B” and “C” weighting
• Detachable microphone
• Fast and slow response
890-2 Calibrator
Sound pressure level calibrators are used before or after taking measurements with sound level
meters and noise dosimeters.
The 890-2 can adjust Simpson models 886-2 and 884-2 or other sound level meters with a 1"
diameter Microphone. The 890-2 provides a constant 94 dB or 114 dB sound pressure level at 1
KHz (0 dB = 0.0002Mbar).
Calibrator is immune to a wide range of temperature and humidity conditions while maintaining
tight output level tolerances.
1
Rev. 04-15
884-2 & 886-2 Sound/Noise
Measuring Systems
Extra Microphone for 886-2
Catalog No. 00183
Microphone Cable for 886-2
Catalog No. 00198
Tripod Mount Microphone Holder
Catalog No. 00184
Sound Level Systems
Simpson Type 2 sound level systems come in a variety of configurations to meet any noise
measurement requirements. Each system is composed of several components designed to work
together as one integrated test instrument and comes with the output jacks that will supply an AC
RMS or DC Volt signal.
• Meets IEC 651 and ANSI S1.4-1983 type 2 instruments.
• Meets OSHA and Walsh-Healy Noise Control Specifications
• Quickly and Accurately Measures Sound Levels in Factories, Offices, Etc.
• Full coverage 40-140 dB with special 85-115 dB OSHA range
• Impact-resistant case contoured to minimize sound energy field reflections
• Operates 40 hours on a 9V battery
• AC and DC voltage jacks for recorder, analyzer and tester Interface
• Built-in tripod mount
2
Rev. 04-15
884-2 & 886-2 Sound/Noise
Measuring Systems
The American National Standards Institute (ANSI) provides for three weighting curves:
"A ", "B", and "C".
The "A" weighted curve more closely corresponds to the response of the ear and is
specified by OSHA.
The "C" curve is essentially a “flat” frequency response and can be used in conjunction with a “fast
response for an approximate indication of impulse noise levels. Low Frequency noises are better
monitored by the “C” curve than the “A” curve. Low frequency sounds need to be louder to be heard.
The chart below shows the relationship between frequency and relative response.
Ordering Information
SOUND LEVEL METERS
Model 884-2
Model 886-2
Catalog Number
w / case
40003
40004
Catalog Number
Model 890-2
Accessories
25' Microphone Cable for 886-2
Microphone for 886-2
Tripod Mount Microphone holder for 00183 microphone
Case, Molded Plastic
12890
Catalog Number
00198
00183
00184
45022
Catalog Number
w / 890-2 Calibrator
40006
40007
3
Rev. 04-15
884-2 & 886-2 Sound/Noise
Measuring Systems
884-2 Type S2A / 886-2 Type 2
Specifications
GENERAL
Physical
Weight
Construction
3.0" x 8.2" x 1.9" (77 x 208 x 47mm)
1.25 lbs (.57kg)
Molded ABS Plastic Housing
POWER REQUIREMENTS
Battery Type
(1) 9V NEDA 1604A
Battery Life
40 hrs. (approx)
TEMPERATURE RANGE
Operating
Storage
Temp. Influence
Operating Humidity
SOUND LEVEL
Ranges
Reference
Accuracy
Weighting
-10° to 50°C
-40° to 60°C
+/-0.015 dB/°C @ 1KHz
+/-0.5dB 0 to 90%
40 to 140 dB
0dB = 20µ Pascals
meets ANSI S1.4-1983 Type 2 instruments
884-2 type S2A (only): "A" (external filter for flat response)
886-2 type 2 (only):
A,B,C, (external filter for flat response)
MICROPHONE
Type
Impedance
Characteristics
SIGNAL OUTPUT
External Filter
RMS Output
dB Output
Calibration
Condenser type L size per ANSI S1.12-1967
350Ώ +/-20% @ 23°C
omnidirectional, angle of incidence approximates random response equal to 70°
120mV RMS at meter reading of +10dB
1.00V RMS at meter reading of + 10dB
1.5 VDC at meter reading of + 10dB
frequency=1000Hz @ 94dB on the 90 dB range, 114 dB on the 110 dB range.
Screwdriver adjustable (from side of case)
METER MOVEMENT
Type
Scale
Accuracy
Response Time
Pivot and Jewel, 2 1/2" dial
-10 to +10 dB w/(15) 1dB markings
2%
Slow = 2.5 dB to a 500ms tone burst of 1000Hz
Fast = 2.0 dB to a 200ms tone burst of 1000Hz
OUTPUT JACK
Type
Switchcraft # 750(0.141"dia.) f/external filter, # 850(0.097" dia.) f/dB and RMS output
4
Rev. 04-15
884-2 & 886-2 Sound/Noise
Measuring Systems
Model 890-2 Calibrator
Specifications
ACCOUSTIC OUTPUT
Frequency
Sound Pessure Level
ACCURACY
Frequency
Sound Level
Distortion
Reference
POWER REQUIREMENTS
Battery Type
Battery Life
ENVIRONMENTAL
Operating Temperature
Output Temperature Coefficient
Relative Humidity
Relative Conditions
PHYSICAL
Construction
Dimensions
Weight
1000Hz, ±1%
94dB, 114dB
±1%
±0.5dB at reference condition
<2%
0dB = 0.0002m bar
(1) 9V NEDA 1604
Approximately 35 hours
0° to 50°C
±0.05dB/°C
0-90%
23°C, 760mmHg, 30-60% relative humidity
Aluminum housing
5 1/4" long x 2" diameter, (131 mm long x 50 mm diameter)
13.5oz (0.35kg)
5
Rev. 04-15
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