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ACCULAB REFERENCE SOUND SOURCES
LEED compliant regionally produced
(History)
(TYPES RSS: 101, 300, 400, 500, 600 (Ultra Power) & 700 (Small Power))
Designed and built according to ISO 6926 and ANSI 12.5.
For routine use in the following
Comparison Sound Power Measurement Methods:
ANSI 12.33, 12.34, 12.36,  ISO 3743, 3744, 3746,  AMCA 300, ASTM F1334

Open-Office Test Loudspeaker
Designed and built according to ASTM E1179.
For routine use in the following speech privacy ASTM methods:
ASTM E1110, E1111, E1130, E1374.

Hemianechoic Test Loudspeaker
Designed and built according to ISO 3745 -Annex A.
For routine use in qualifying hemianechoic chambers without floor cavities.


RSS 600 (Ultra Power) and RSS 700 (Small Power).
Open-Office Component Test Loudspeaker (OOLS).
Hemianechoic Room Test Loudspeaker (HALS)
OOLSA Pink Noise Amplifier for OOLS and HALS.

All Equipment Uniquely Designed for
Laboratory and Field
Noise Measurement Applications
Anywhere, any Time

RSS Units Available:
LEED compliant regionally produced


RSS Sound Power, All Units
[
See price list                                                      (Click RSS images for more information.)

RSS101
RSS 101

RSS 400
RSS 400 (RSS 300 Similar)


RSS 500
RSS 500


 RSS Unit 600
RSS 600


 Carry Case 500
Ship & Carry Case for RSS 500, 600.
Store indefiitely. Lock. Ready instantly.
RSS 101U
RSS 101U
RSS 101U-H
RSS 101U-H

RSS102
RSS 102
See price list
  RSS 700
RSS 700


===========================================
ACCULAB
OPEN OFFICE TEST LOUDSPEAKER
  per ASTM 1179 for ASTM 1111
===========================================
Office test sound source
==================================
HEMIANECHOIC SPACE TEST LOUDSPEAKER
For ISO 3745, ANSI 12.35
==================================
 
Hemi-anechoic test sound source
==================================
Loudspeaker
Pink Noise Source

& Amplifier
For OOLS and HALS
==================================
Office test sound source

OOLS
OOLS
(Clickimage  for more information.)
HALS
HALS
(Click image for more information.)

OOLSA
OOLSA-1105
(Click image for more information.)



\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ Information: /////////////////////////////////////////////////////// CONTENTS OF
REFERENCE SOUND SOURCE MANUAL

Specifications
Unpacking / Acoustical Application
Hemianechoic Calibration Data
Packing / Shipping / Parts List
Prices

    NOTE 1: The device called a "reference sound source" is used throughout industry and engineering where it is necessary to determine the amount of noise (sound power) that is emitted by a device (fan, vacuum cleaner, engine, etc.) into the surrounding environment. Though it is possible to do so by extensive sound level measurements in a controlled (lab) environment, such a process is tedious and uncertain without extensive calibrated acoustical equipment and certified procedures.

On the other hand, the much simpler "substitution (comparison) method" is possible, where the device under test (DUT) is operated in its natural environment while conventional sound pressure level (SPL) measurements are made around the DUT. The DUT is then shut off. The  "Reference Sound Source" (RSS) is placed next to the inoperative DUT, switched on, and the SPL is again measured in the same way as before. The RSS sound power output has previously been calibrated by precise methods, so the sound power of the device under test is simply calculated as

DUT.PWL = DUT.SPL - RSS.SPL + RSS.CAL ,      dB re one Picowatt.

[One Picowatt = 10^(-12) watts.]

    CALIBRATION FREQUENCY RANGE: Such sound power can be measured at all audio frequencies, typically in 1/3 octave bands separately. A distinct advantage of our ACCULAB reference sound sources is that they are of stable sound power emission over an extremely wide frequency range. In addition, we calibrate (Hemianechoic outdoors) all our RSS units outdoors, where there is no lower frequency limit, on request, from 12.5 Hz through 20,000 Hz. (Conventional indoor laboratories are restricted in size so that  data below 100 Hz are difficult to impossible to produce, though several such laboratories now produce data to as low as 50 Hz) .

  Our original unit (starting circa 1982), the RSS101, is for use on 60 Hz alternating current common in North America. A 50 Hz, 220vac unit, the ACCULAB RSS 300 is also available, which can also operate (special order) on 110vac.

    NOTE 2: In recent years, sound power measurement with the INTENSITY method has become increasingly important. ISO 9614, parts 1 and 2 now address this measurement. Ostensibly, it should be immune to background noise to an extent. It was at first implied that a reference sound source was then not needed. But in reality, the intensity method requires a special probe having two identical microphones, a complex analog/digital signal processor, software algorithms that are in themselves complex. In addition, microphone spacing must be changed at least once to measure sound power over a wide frequency range. Not all operators and technicians are experienced in handling all of these parameters.

    The practical result is that despite the fact that one may have expended a great deal of time, money and travel efforts to set up an intensity sound power test, the credibility and reliability of the results can come into question. Therefore, it has become prudent to maintain a reference sound source such as the RSS101 on hand ether at the home office or in the field for routine "Validation" of hardware, software, and scanning technique elements on-site. To wit: The sound power deduced by the intensity apparatus + software setup + scan method when applied to the RSS as a DUT shall match the RSS101 calibration values within 1 dB from 100 Hz through 5,000 Hz. If there is a discrepancy, the intensity apparatus, etc. is at fault. i.e. the RSS acts as a 3 dimensional "pistonphone"!

    The Hemianechoic Calibration following shows such RSS.CAL information for a typical ACCULAB RSS 101.


RSS NOMINAL PERFORMANCE SPECIFICATIONS
(See certification page for precise data)

Sound Power Output Uniformity (Typical - RSS Type 101) hemianechoic Calibration:

A-Weighted = 86 dB re 1 Picowatt (See RSS-101 Embossed Tag)
Full Octave Level = 79 + 2 dB re 1 Picowatt (63 to 4,000 Hz)
1/3 Octave level = 73.5 + 3.5 dB re 1 Picowatt (50 to 5,000 Hz)
[Sound Power Levels are Constant and Usable from 12.5 Hz through 20,000 Hz]
For frequencies above 20,000 Hz see the Ultrasonic RSS.

Features (All RSS Units):

                  • Omnidirectional
                  • Protective Frame, Powder Coated, Black (new)
                  • Ruggedized Fan Wheel
                  • Carrying Handle
                  • Isolator Friction Feet
                  • (Per ANSI S1.31 1980)
                  • Instant Start
                  • Drip-Proof Motor
                  • Wheel Key
Physical:

Size: 240 x 240 x 410 mm (10" x 10" x 16")
Weight: 11 kg (24 lbs)
Power: 115 VAC 1 ph, 60* Hz. (750 V A )
Color: Olive  with Black Powder Coarted Frame.

For Additional Information:

PHONE  6 1 4 - 8 7 6 - 5 1 0 8 & FAX   //  Cell 6 1 4 - 5 6 0 - 0 5 1 9
SKYPE: angelojcampanella


UNPACKING / ACOUSTICAL APPLICATION

    OPERATING INSTRUCTIONS:

    GENERAL

    The Reference Sound Source is shipped ready for use after unpacking. Precautions, calibration and acoustical application notes are as follows.

    UNPACKING

    Before placing the RSS-101 into use, please observe the following precautions.

  1. Remove the RSS-101 from the corrugated Kraft board container by pulling upward by its frame (5/16" rods and also cross-bar with spiral-wrap). Preserve container, foam pads and shipping sleeve for subsequent use. (Pads or side position unload resilient feet during long term storage).
  2. Place it upright on its rubber feet on a firm floor or bench.
  3. Remove the shipping sleeve. (Similar support devices should be used when shipping the RSS- 101 0792 to distant locations.)
  4. Inspect Fan wheel for uniformity and firmness of shaft attachment. Use 4 mm Allen key supplied to torque both wheel hub set screws to 30 inch-pounds if in doubt. (Access Allen screw heads between fan wheel blades). Verify fan wheel serial number as " " written inside fan wheel hole near the hub.
      ACOUSTICAL APPLICATION
  1. Set the RSS-101 on its feet at the desired location. Maintain its spacing from vertical surfaces according to the applicable acoustical test requirements.
  2. The floor under the RSS-101 should be firm and not prone to act as a "sounding board" which can cause spurious sounds. Our new spring-isloated feet minimizes this to the extent that is is no longer a problem in most situations. If such spurious action is still suspected (on very thin sheet metal panels), Place a layer of 3/4" plywood at least 1m round or square under the RSS101, or move it to a firm location. If the RSS-101 is set on an elevated flat horizontal surface, that surface should be at least 3' (1m) square or round to assure that the calibrated sound power is emitted into the test area.
  3. Maintain fingers well clear of fan wheel. Clear a 5' diameter area of dust and loose paper objects since air flows out of the fan wheel perimeter onto the room floor during normal RSS-101 operation.
  4. Plug into 115 VAC, 60 Hz, single phase power (grounded pin receptacle). Fan will start immediately. Extension cord length vs minimum wire size: 100'- #16; 200'-#14. Check RPM with a photo-tachometer. RPM should be between 3530 and 3550. If it is less than 3520, then the a.c. line voltage is too low or the extension cord must be shorter or of heavier gage wire. Operation at 3510 rpm may be used provided 0.25 dB are subtracted from all calibration data values (according to a 50*Log(3545/RPM) correction rate).
  5. Note: International 50 Hz RPM values range from 2910-2940 RPM.
  6. Operation may be continuous for ambient air temperatures below 40° C. Run acoustical tests. Calibration data is on the next page or the current certification report or other generic data appended to this manual.
  7. Disconnect the RSS-101 from electrical power when you are not actually producing acoustical test data to avoid inadvertent damage to fan wheel.
  8. Replace RSS-101 in its shipping container when not in use. (Storage on its side, or supported by the box-bottom pad will unload and prevent distortion of the resilient feet during long-term storage).
  9. Similar methods and precautions apply to all other RSS units (102, 300, 400, 500, 600, 700).




Site Environmental Notes:

    These data may be used to determine test sound power by the substitution (comparison) method.
 Test site sound power emitted depends on air density via site temperature, T°C (T°F) and site altitude, ,Elev. in meters (feet) above sea level as:

site PWL = calPWL - 30*Log[(T+273)/288] - Elev/914 dB re 10-12 Watts.   (mks)

site PWL = calPWL - 30*Log[(T+459)/518] - Elev/3000 dB re 10-12 Watts. (US)

This is under study.


Room Absorption:

These data may be used to determine room absorption through:   

SPL = [PWL - 10 Log ( a A ) + 16.3* ] dB re 20 micropascals,

where PWL is dB re one Picowatt of sound power, a is the room surface average random incidence absorption coefficient and A is the total surface area in square feet with that absorption. * If A is in square meters, this constant is +6.2 dB.

HEMIANECHOIC CALIBRATION

RSS Type 101
LEED compliant regionally produced

RSS101
RSS 101
(Click for larger photo)

HEMIANECHOIC CALIBRATION: RSS Type 101 (0792) S/No. 07 92 233 

Accuracy: 12.5 Hz to 80 Hz ± 2 dB; 100 Hz to 3.15 kHz ± 0.8 dB; 4 kHz to 10kHz ± 1.5 dB

1/3 Octave Band
 Center Freq. Hz.
Sound Power Level,
dB re 1 pW
Octave Band
Center Freq. Hz.
Sound Power Level
dB re 1 pW
AMCA
BAND #
12.5
16
20
60
60
60
16 65 -1
25
31.5
40
61
64
68
31.5 70 0
50
63
80
73.6
71.5
70.8
63 76.9 1
100
125
160
71.1
72.0
72.7
125 76.8 2
200
250
315
73.3
73.7
73.9
250 78.4 3
400
500
630
74.5
73.6
73.2
500 78.5 4
800
1000
1250
74.0
75.4
76.5
1000 80.2 5
1600
2000
2500
76.4
75.8
74.1
2000 80.3 6
3150
4000
5000
73.5
72.9
73.1
4000 77.9 7
6300
8000
10000
72.5
70.2
67.0
8000 (4) 75.2 8
12500
16000
20000
63.6
61.2
58.9
16000 66.4 9
Linear Weighted PWL = 87.4 dB
A-Weighted PWL = 86.0  dB(A) re one Picowatt

See price list.

RSS Type 300 (50Hz operation)

RSS Type 300
LEED compliant regionally produced

RSS 300
click for larger image
HEMIANECHOIC CALIBRATION: RSS Type 300 (International 50 Hz Version) 
Accuracy: 12.5 Hz to 80 Hz ± 2 dB; 100 Hz to 3.15 kHz ± 0.8 dB; 4 kHz to 10kHz ± 1.5 dB
LEED compliant regionally produced
1/3 Octave Band Center Freq. Hz.
Sound Power Level,
dB re 1 pW

Octave Band
Center Freq. Hz.

Sound Power Level
dB re 1 pW
AMCA BAND #
12.5
16
20
65
65
65
16
70
-1
25
31.5
40
67
73
73
31.5
76
0
50
63
80
73.6
75.1
75.4
63
79.5
1
100
125
160
76.0
76.2
76.6
125
81.1
2
200
250
315
76.5
76.5
76.2
250
81.2
3
400
500
630
76.2
76.7
76.4
500
81.2
4
800
1000
1250
77.7
79.8
80.2
1000
84.1
5
1600
2000
2500
80.4
79.2
77.7
2000
84.0
6
3150
4000
5000
77.1
76.6
76.7
4000
81.5
7
6300
8000
10000
75.9
73.9
71.2
8000
78.8
8
12500
16000
20000
68.3
66.1
64.1
16000
71.2

Linear Weighted PWL = 91.0 dB(L)
A-Weighted PWL = 89.6 dB(A) re one picowatt

See price list.



RSS Type 400
LEED compliant regionally produced

RSS 400
RSS 400
(Click for larger photo)


HEMIANECHOIC CALIBRATION: RSS Type 400 (60 Hz High Power)
Accuracy: 12.5 Hz to 80 Hz ± 2 dB; 100 Hz to 3.15 kHz ± 0.8 dB; 4 kHz to 10kHz ± 1.5 dB
1/3 Octave Band
Center Freq. Hz.
Sound Power Level,
dB re 1 pW
Octave Band
Center Freq. Hz.
Sound Power Level
dB re 1 pW
AMCA
BAND #
12.5
16
20
67
66
66
16 72 -1
25
31.5
40
68
72
77
31.5 79 0
50
63
80
76
78
79
63 83 1
100
125
160
80
81
81
125 86 2
200
250
315
82
82
82
250 86 3
400
500
630
81
81
81
500 86 4
800
1000
1250
82
84
85
1000 89 5
1600
2000
2500
85
84
83
2000 89 6
3150
4000
5000
82
82
82
4000 87 7
6300
8000
10000
81
80
78
8000 85 8
12500
16000
20000
75
73
71
16000 78 U
Broad band: A-Weighted PWL = 94 dB(A)
Linear Weighted PWL = 96 dB(L) re one picowatt.

See price list.


RSS Type 500
LEED compliant regionally produced

RSS 500
RSS 500

(Click for larger photo)
LOW FREQUENCY REFERENCE SOUND SOURCE RSS 500 as used for Laboratory and Field Noise Measurement Applications. Sound Power Output Uniformity (Hemianechoic Calibration):
  • A-weighted = 86 dB re 1 Picowatt (See  RSS-500 embossed Tag)
  • Full Octave Level = 77 + 4 dB re 1 Picowatt (16 to 8,000 Hz)
  • 1/3 Octave level = 72 + 5 dB re 1 Picowatt (12 to 8,000 Hz)

[Sound Power Levels are Constant and Usable from 25 Hz through 10,000 Hz]

  FEATURES:

  • OMNIDIRECTIONAL
  • PROTECTIVE FRAME
  • RUGGEDIZED FAN WHEEL
  • CARRYING HANDLE
  • ISOLATOR FRICTION FEET
  • (Per ANSI S1.31 1980)
  • INSTANT START
  • DRIP PROOF MOTOR
  • WHEEL KEY

PHYSICAL:

Size: 330 x 330 x 380 mm (13" x 13" x 15")
Weight: 13 kg (29 lb.)
Power: 115 V ac 1 ph, 60* Hz. (700 V A )



HEMIANECHOIC CALIBRATION:          RSS Type 500, Serial No. 1290 502

Accuracy: 12.5 Hz to 100 Hz ± 2dB; 125 Hz to 5 kHz ± dB; 6.3 kHz to 20kHz ± 2dB

  Replica Watches  Replica Rolex  Fake Rolex  Rolex Replica  Replica Tag Heuer  Fake Tag Heuer  Replica Cartier  Fake Cartier  Cartier Replica  Tag Heuer Fake

1/3 Octave Band
Center Freq.Hz.
Sound Power Level,
dB re 1 pW
Octave Band
Center Freq. Hz.
Sound Power Level
dB re 1 pW
AMCA
BAND #
12.5
16
20
70
69
69
16 74 -1
25
31.5
40
68.0
68.4
70.0
31.5 73.7 0
50
63
80
72.9
72.7
72.6
63 77.5 1
100
125
160
72.3
71.9
71.8
125 76.8 2
200
250
315
71.9
72.4
73.0
250 77.2 3
400
500
630
73.5
73.5
75.1
500 78.8 4
800
1000
1250
76.5
77.2
76.4
1000 81.5 5
1600
2000
2500
75.1
73.9
72.8
2000 78.8 6
3150
4000
5000
72.5
72.1
71.9
4000 76.9 7
6300
8000
10000
70.9
68.7
66.1
8000 73.8 8
12500
16000
20000
63
61
59
16000 66 9
Broad band: Linear Weighted PWL = 87.3 dB(L) re one picowatt
A-Weighted PWL = 85.7 dB(A) re one picowatt

PERIODIC CALIBRATION AND RECERTIFICATION:

    The RSS-500 will produce a constant sound field indefinitely as long as proper power is applied and the calibration RPM is achieved. Fan wheel distortions and dust accumulation can alter the sound output. Dust can be removed with a dry clean brush. Substantial fan wheel distortions that have been repaired will alter the sound field, and recalibration is advised. This can be done by an acoustical sound power testing laboratory according to ISO 6296 or ANSI 12.5.

See price list.
============================================================================

RSS Type 600
LEED compliant regionally produced

RSS 600
RSS 600

(Click for larger photo)
      New! RSS 600 designed to meet the severe needs of outdoor and large equipment sound power measurement via the substitution (comparison) method, viz. ISO 3746, testing in environments that are not quiet. Sound power is rated at 104 dBA re one picowatt on 60 Hz and  100 dBA re 1 picowatt on 50 Hz, both 220vac, 30 amps start, 15 amps run. New frame is powder coated for durability.

MIANECHOIC CALIBRATION:    RSS Type 600, Serial No. 0303 601
Accuracy: 12.5 Hz to 100 Hz ± 2dB; 125 Hz to 5 kHz ± O.8dB; 6.3 kHz to 20kHz ± 2dB

1/3 Octave Band
Center Freq.Hz.
Sound Power Level,
dB re 1 pW 
60 Hz | 50 Hz
Octave Band
Center Freq. Hz.
Sound Power Level
dB re 1 pW
60 Hz | 50 Hz
AMCA
BAND #
12.5
16
20
76 | 72
74 | 72
74 | 75
16 80 | 78
-1
25
31.5
40
79.1 | 78.3
81.7 | 78.5
82.7 | 80.1
31.5 86.2 | 83.8
0
50
63
80
83.9 | 81.2
85.6 | 83.0
87.8 | 86.4
63 90.8 | 88.8
1
100
125
160
90.7 | 87.1
91.0 | 87.3
91.2 | 86.8
125 95.7 | 91.8
2
200
250
315
90.7 | 86.4
90.4 | 86.5
90.7 | 86.6
250 95.4 | 91.3
3
400
500
630
90.2 | 86.7
90.0 | 86.7
91.5 | 88.1
500 95.4 | 92.0
4
800
1000
1250
93.1 | 89.6
94.1 | 90.4
93.8 | 90.1
1000 98.4 | 94.8
5
1600
2000
2500
93.2 | 89.9
93.6 | 89.4
94.1 | 89.9
2000 98.4 | 94.3
6
3150
4000
5000
93.6 | 88.8
92.7 | 88.8
91.7 | 87.2
4000 97.5 | 92.8
7
6300
8000
10000
91.1 | 86.5
89.7 | 85.0
88.3 | 83.8
8000 94.6 | 90.0
8
12500
16000
20000
86 | 81
84 | 79
81 | 76
16000 89 | 84
Broad band: Linear Weighted PWL = 105.5 | 101.5 dB(L) re one picowatt
                             A-Weighted PWL = 104.4 | 100.3 dB(A) re one picowatt

    The RSS-600 will produce a constant sound field indefinitely as long as proper power is applied and the calibration RPM is achieved. However, significant fan wheel distortions and dust accumulation can alter the sound output. Dust can be removed with a dry clean brush. Substantial fan wheel distortions that have been repaired will alter the sound field, and recalibration is advised. This can be done by an acoustical sound power testing laboratory according to ISO 6296 or ANSI 12.5.

See price list.
=========================================================================

RSS Type 700
LEED compliant regionally produced

RSS 700
RSS 700

(Click for larger photo)
     New! The RSS 700 designed to meet the needs of computer equipment manufacturers to measure the sound power of products that are relatively quiet at 25-70 dBA re one picowatt, and that must be measured at a radius of 1/2 meter (20"). This RSS 700 is less than o.25m in size, meeting the requirements of all the ISO series, viz. ISO 3746, for Reference Sound Source size. It emits a sound power of 65 dBA re one picowatt. A windscreen is provided to avoid windage effects on nearby microphones. It operated on 115vac, 60 Hz. It may operate at 50 Hz with a lower sound power emission (about 60 dBA re one picowatt.

HEMIANECHOIC CALIBRATION:      RSS Type 700, Serial No. 0803 701

Accuracy: 50 Hz to 80 Hz ± 2dB; 100 Hz to 3.15 kHz ± 0.8dB; 4 kHz to 10 kHz ± 1.5 dB;
12.5 kHz to 20 kHz ± 2dB

This RSS is specially designed to only 0.25m (10") tall to fit the special condition of a small measurement volume (0.5m radius) needed for small business (computer) equipment. Calibration was performed on a 0.5m radius hemisphere.  In addition, the special spring isolation feet will prevent spurious sound radiation from the table on which this sound source is mounted.

1/3 Octave Band
Center Freq.Hz.
Sound Power Level,
dB re 1 pW
Octave Band
Center Freq. Hz.
Sound Power Level
dB re 1 pW
AMCA
BAND #
50
63
80
62
60
60
63 66 1
100
125
160
59.3
58.6
58.4
125 63.5 2
200
250
315
58.2
57.8
57.8
250 62.7 3
400
500
630
57.9
57.8
57.4
500 62.5 4
800
1000
1250
57.5
58.4
57.5
1000 62.6 5
1600
2000
2500
57.2
56.9
56.5
2000 61.6 6
3150
4000
5000
55.4
53.9
52.5
4000 58.9 7
6300
8000
10000
50.9
48.5
45.8
8000 53.6 8
12500
16000
20000
43
41
37
16000 46 9
Broad band: Linear Weighted PWL = 71.4 dB(L) (50 Hz - 20 kHz) re one picowatt
A-Weighted PWL =67.8 dB(A) re one picowatt

PERIODIC CALIBRATION AND RECERTIFICATION:
The RSS 700 will produce a constant sound field indefinitely as long as proper power is applied and the calibration RPM is achieved. However, significant fan wheel distortions and dust accumulation can alter the sound output. Dust can be removed with a dry clean brush. Substantial fan wheel distortions that have been repaired will alter the sound field, and recalibration is advised. This can be done by an acoustical sound power testing laboratory according to ISO 6296 or ANSI 12.5 under the special condition that sound measurement is made on a o.5m radius surface..

See price list.
===================================================================


RSS 102 "Ilg" Simulation Reference Sound source Someone once asked us to provide a replacement for their old damaged Ilg Fan.
So we layed our RSS101 on its side, grafted appropriate feet to mantain floor spacing, then added our protective frame and carrying handle for convenience... this was the result.
LEED compliant regionally produced
RSS 102


===================================================================

RSS 101U


RSS 101U Air Ultrasound reference Sound source (ANSI WG1.26-draft)
LEED compliant regionally produced
 
RSS 101U
    We produce this special reference sound source for air ultrasound to meet the needs of manufacturers of ultrasound detectors such as leak detectors and motion sensors. This RSS 101U will produce calibrated intensity from 10 kHz through 100 kHz. It provides a steady and reliable ultrasound field that is also useful for calibration of ultrasound microphones by the substitution (comparison) method of ANSI WG1.26 (draft).
    A distinct advantage of substitution (comparison) calibration of microphones in this RSS101U broad band sound field is that the broad band sound, even just 1 kHz wide,  eliminates the "Ripple" or Scalloping" effect of pure tone sound waves spawned by nearby jigs and fixtures.

 
RSS 101U
    This RSS 101U produces a cylindrical source of ultrasound 3 inches (75mm) high and 6" (150mm) wide, Omnidirectional in all azimuth directions. Test microphones are usually positioned 1/2m from the source. There, in the 10-20 kHz frequency range, will be found broad band ultrasound having a sound pressure level of about 60  re dB re 20 micropascals, per kHz of bandwidth. This sound field diminishes to about 50 dB in a one kHz band at 50 kHz, to 34 dB in a one kHz band at 100 kHz. .  It operated on 115vac, 60 Hz. It may operate at 50 Hz with a lower sound power emission. Physical size and weight is the same as our RSS101.


ULTRASONIC ANECHOIC CALIBRATION: RSS Type 101U (0597) S/N No. 07 92 235U
Accuracy:  +1 dB @ 1 kHz to 80 kHz : //////// +2 dB @ 81 kHz to 100 kHz

    The RSS 101U is specially designed to produce reliable and steady broad band ultrasound in air at frequencies above from ten kilohertz to 100 kHz and higher. Calibration is performed at a distance of 0.5m from the axis of the ultrasound cylinder wheel. Calibration data are taken with a 100-line FFT. Hanning* window, 1 kHz wide, located in 1 kHz steps from 1 to 100 kHz.

    *(A Rectangular FFT Window provides parity for energy anywhere in the window band, but leaks sound outside that band.) For reporting the calibration spectrum of th broad band sound emitted, the FFT Hanning Window is used because it prevents most energy leakage outside of the designated band. This Hanning window also reports a value that is 1.76 dB greater than that reported by a Rectangular FFT Window. This fact is indicated in the Claibration report. See: B&K Technical Review, 1987 issue 3, page 13.

Typical ultrasound RSS101U sound emission values* are:

.

FFT Window
Lower
  Freq, kHz
1Khz Band Sound Pressure Level*
  @ o.5m,
dB re 20 uPa
FFT Window
Lower
  Freq, kHz
1Khz Band Sound Pressure Level*
   @ o.5m,
dB re 20 uPa
5
10
15
20
30
40
62
59
63
59
56
51
50
60
70
80
90
100
48
45
42
39
36
34
    (1) Calibration was performed 1 November 2005 at an ultrasonic anechoic indoor site per (ANSI S1.4) at a horizontal distance of 20 inches (0.5 m) from the fan wheel centerline and at a single microphone position. The measurement microphone was a Larson-Davis type 2520 S/N 1473 with its protective grid removed and corrected to free-field conditions. Measurement data were corrected for air & humidity attenuation. Air temperature was 19 C (67 F), Air Humidity = 45%, Air pressure = 993 mB (745 mmHg). RSS101U RPM = 3555+-1 RPM at a supply frequency of 60 Hz and a line voltage of 120 vac at the RSS plug.

    (2) These data may be used to calibrate the response of ultrasonic acoustical receivers positioned in the plane of the fan wheel at 0.5m (20") from the center of the fan wheel. The acoustical energy apportioned to the response is calculated from the bandwidth, B, of your signal receiver (Hz between "3db down" response frequencies) as follows:

SPL received @ 20" = cal SPL - 1.67*A+ 10Log[(B/1000) dB re 2*10-5 Pascals.

    The calibrated SPL is then chosen from the above table for the frequency that is the center of the frequency range of bandwidth, B. The value of A is found from page 6 (humidity). If B is more than 5,000 Hz, then individual 1,000 Hz band calibrated levels shall be decibel-summed to provide the energy received by the receiver.

    (3) If the receiver is placed at greater distances (more than 0.5m or 20"),   the calibrated SPL level should be re-computed according to

test SPL = cal SPL - 20*Log[2*D] - 3.3*D*A dB re 2*-5 Pascals.

where D is the distance in meters, and A is found in the graph on page 6 for the test site air humidity and approximate temperature.         
  rev 08-99

====================================================================
  NEW:   RSS 101U-H Air Ultrasound reference Sound source (NEW)
LEED compliant regionally produced
 
RSS 101U-H
    We just developed and shipped a new ultrasound source that is effective up to 400 kHz to meet the needs of scientists, engineers and experimenters that need calibrated ultrasound microphones for acoustical scale modeling and for animal bioacoustics evaluation of the uttereances and sound emissions of small animals and insects. This new RSS 101U-H  will produce calibrated ultrasound from 10 kHz through 400 kHz. It provides a steady and reliable ultrasound field that is also useful for calibration of ultrasound microphones by the substitution (comparison) method of ANSI WG1.26 (draft).
    A distinct advantage of substitution (comparison) calibration of microphones in this RSS101U-H broad band sound field is that the broad band sound, even just 1 kHz wide,  eliminates the "Ripple" or Scalloping" effect of pure tone sound waves spawned by nearby jigs and fixtures.

 
RSS 101U-H
    This new RSS 101U-H produces a source of ultrasound on a conical surface 2cm thick and 8 cm in dimater within which a microphone can be positioned for comparison sensitivity measurement. There, in the 10-400 kHz frequency range and at a distance of 8 cm will be found intense broad band ultrasound. The sound pressure level there is over 90  re dB re 20 micropascals per kHz of bandwidth from 10kHz to 125 hHz, diminishing to 85 dB in a one kHz band at 200 kHz, to 68 dB in a one kHz band at 300 kHz and 58 dB at 400 kHz. The ultrasound energy produced also extends to higher frequencies.  It operates on 115vac, 60 Hz. It may operate at 50 Hz with a lower sound power emission. Physical size and weight is the similar to our RSS101.


PACKING / SHIPPING / PARTS LIST / PRICES
(ALL RSS UNITS)

SERVICE DIFFICULTY, SHIPPING AND FACTORY REPAIRS:

    In case of any difficulties, contact ACCULAB (614)\876-5108 (A.J. Campanella) for further help and instructions. If it is necessary to ship the RSS-101 anywhere, or to return it to ACCULAB, proceed as follows: 1/Do NOT load this bare-framed instrument surrounded by only bubbles or pellets, as the fan wheel can be damaged in this environment. Rather, 2/Place the source unit in a close fitting corrugated Kraft box as originally shipped, then 3/Install shipping stabilizer corner strips, top & bottom blocks to support the perimeter of the exterior frame, and a cardboard shim between the fan and the motor bearing boss. (If you expect abusive shipment, place this box in a larger container with cushioning foam, bubbles or pellets, though this precaution is usually unnecessary for domestic US shipment, since the reinforced steel frame is also a sturdy shipping container.) Seal and ship by Air Freight, UPS or US Parcel Post

==================================================
==================================================.

Standard Prices for ACCULAB components.

Effective 20 August, 2012


ACCULAB REFERENCE SOUND SOURCE (RSS) UNIT TYPE

(For determining Sound Power Emission via the "substitution (comparison) Method")
LEED compliant regionally produced

Unit Type
RSS 101
RSS 102
RSS 300
RSS 400
RSS 500
RSS 600
RSS 700
RSS 101U
RSS 101U-H
Applicability 
Standard
US
Horizontal Axis +++
     
 World     
 
Higher SPL
  US
ULTRA-SPL
Computer Equipment
Air
Ultrasound
*
Air High
Ultrasound
*
Power Mains Frequency
60 Hz
60 Hz
50 | 60Hz
60 Hz
60 Hz
50 | 60Hz
60 Hz
60 Hz
60 Hz
Power Mains Voltage, VAC
110-120
110-120
220+20 vac
110-120
  110-120
220+20 vac
110-120
110-120
110-120
Operating RPM
3550
3550
2930
3500
1740 2930 | 3530 1740 3550 --
A-Wtd PWL, dB re 1pW 86 86 90 94 86 100 | 105 65 *10k-100kHz *20k-400kHz
Price US$ FOB Columbus, OH Basic - Uncalibrated $1,100 $1,200 $1,700 $1,600 $1,500 $2,600 $2,200 $1,200 $2,000
With Hemianechoic Calibration
12- 20,000 Hz
60Hz $ 1,000
50Hz $ 1,200
$2,100 $2,200 $2,900
(50 Hz)

$3,900
(50 Hz
&
60 Hz)
$2,600
$2,500
$3,600
(60 Hz)

$3,800
(50 Hz)

$4,800
(50 Hz
and
60Hz)
$3,200
(60 Hz)

$3400
(50 Hz)

*SPL@ 0.5m
in 1kHz bands
10-50 kHz:
47-55 dB.
51-100kHz:
33-47 dB


$2,200
*SPL@ 8 cm
in 1kHz bands:

10-200 kHz:

85-95 dB.
225-400kHz:
58-82 dB

 $3,000.
Availability Stock 30 days
30 days Stock Stock 30 days 60 days 30 days 60 days
   +++  (Similar to the historic "Ilg" RSS, but our RSS102 has a protective frame, with vibration Isolation feet) +++
* NEW - TYPE RSS101U-H ==Emits up to, and is calibrated to 300 kHz. Call.....614-876-5108 or cell 614-560-0519 *

Ship-Carry-StoreCase Price
Ship-Carry-Store Case100 $300
Ship-Carry-Store Case 500
$350

PHONE  6 1 4 - 8 7 6 - 5 1 0 8 & FAX   //  Cell 6 1 4 - 5 6 0 - 0 5 1 9
SKYPE: angelojcampanella

#CarryCase
CarryCase100
Ship-Carry-Store Case100
(Click image for larger photo)
The ultimate in field utility!
One-hand carry; about 37# total with RSS.
Ship anywhere.
Store indefiitely.
Ready instantly
CarryCaseOpen
Ship-Carry-Store Case100 Open
(Click image for larger photo)
CarryCase500
Ship-Carry-Store Case500
(Clickimage  for larger photo)
Ship anywhere.
Store indefiitely.
Ready instantly
/////////////\\\\\\\\\\\\\\\\\\\\\\//////////////////////////\\\\\\\\\\\\\\\\\\\\\\\\\\\\\/////////////////////////\\\\\\\\\\\\\\\\\\
===================================

ACCULAB SPECIAL LABORATORY AND FIELD TEST LOUDSPEAKERS:
(HALS = Floor Surface FLUSH Mounted (no cavity required) for ISO 3745 and ANSI 12.35;
Hemianechoic Directivity = 
Point Source)
(OOLS = Monopole sound source; Directivity like the Human Voice)

HALS
LEED compliant regionally produced

HALS
HALS

(Click for larger photo)
     Our new Hemianechoic Space Test Loudspeaker (HALS). Meets the requirements of ISO 3745 and ANSI 12.51 for qualifying hemianechoic test chambers for certified use via the "draw-away test" as specified in the ISO 3745 and the ANSI 12.51 annexes. 

      NEW!: The HALS is laid directly on the floor of the laboratory space being certified for future use to measure sound power, etc. This bare HALS speaker unit will serve to qualify the majority of spaces and survey angles. An auxiliary ramp is provided to serve lower survey lines as may be required. The HALS speaker may be driven with pink noise from an external 20 watt amplifier of 8 ohm output impedance. The HALS is laid directly on any flat laboratory space floor; no cavity is necessary. 
Click Here for Data

      This HALS is fully compatible with our new  noise generator-amplifier-driver, OOLSA-1105 that provides a fixed drive from 115vac (50Hz/220vac available on special order). The OOLSA-1105 attaches by a short cable to the HALS to drive it to produce steady uninterrupted sound. The OOLSA-1105 also provides a synch pulse for MLS signal processing (2-second cycle, 8 seconds on special order).

See price list


OOLS
LEED compliant regionally produced

OOLS
OOLS

(Click for larger photo)
     This Open-Office Component Test Loudspeaker (OOLS) meets the requirements of ASTM 1179, "loudspeaker", as used to perform ASTM tests E1111 (ceilings) E1375 (barriers), E1376 (wall panels) and E1130 (Articulation Index, AI). It may be driven with pink noise from an external 20 watt amplifier of 8 ohm output impedance. An attached pink noise generator/amplifier is available (A-0389) that provides a fixed drive from 115vac. (50Hz/220vac available on special order). The OOLS mounts on a camera tripod, attached by the standard 1/4x20 camera screw. Click Here for Data

       This OOLS is fully compatible with our new  noise generator-amplifier-driver, OOLSA-1105 that provides a fixed drive from 115vac (50Hz/220vac available on special order). The OOLSA-1105 attaches by three screws to the rear of the OOLS body. Existing OOLS units, that were shipped separately, can be modified to accept the 3 screws, or they can be driven from a short cable to the OOLSA-1105 to produce steady uninterrupted sound. The OOLSA-1105 also provides a synch pulse for MLS signal processing (2-second cycle, 8 seconds on special order).

See price list below.

===================================================

NEW:


OOLSA 1105

PINK NOISE GENERATOR- AMPLIFIER, (WITH MUTE INPUT AND
MLS SYNCH TRIGGER OUTPUT).
LEED compliant regionally produced

Amplifier
OOLS
SPEAKER DRIVER +
OOLSA 1105
PINK NOISE GENERATOR- AMPLIFIER,
(WITH MUTE INPUT AND
MLS SYNCH TRIGGER OUTPUT).
OOLS+Amplifier
Amplifier
(Click for larger photo)
      This OOLSA-1105 electronic noise generator-amplfier is fully compatible with our OOLS loudspeaker and HALS loudspeaker. It includes a digital random signal generator, plus internal (factory) volume and equalization controls to smooth the spectrum output toward a relatively uniform pink noise . It will drive both speakers to their maximum allowable steady state sound power over the entire usable frequency range. Approximate size and weight: 2"x5"x8", about 2 pounds, brushed aluminum finish. Electrical input power  required is 115vac. Protection by thermistor cut-off, recoverable 50-60Hz. Input for 220vac is available on special order (reconfigured wiring).

    A mute input, and a synch pulse output for MLS signal processing (2-second cycle, 8 seconds on special order) are included.The OOLSA-1105 attaches by a short cable to both the OOLS and the HALS to drive both to produce steady uninterrupted sound. It an also be rigidly mounted to the rear of the OOLS enclosure with three screws, ordered new that way, or any existing OOLS unit can be modified to Include the OOLSA-1105 permanently.  

   


   See price list (below).
===============================================================


LEED compliant regionally produced

Unit Type HALS    (ISO 3745, ANSI 12.35)
OOLS (ASTM 1179)
OOLSA-1105 with MLS Synch Output


Applicability

Hemianechoic  Lab Qualification 
(ISO 3745)

Open-Office Test (ASTM 1111)


Noise / Amplifier-Driver
SPL @ 1m, dBA 85 95 95-100
Useful Frequency Range
50 - 10,000 Hz

25 - 8,000 Hz

50-10,000 Hz
Price US$ FOB Columbus, OH $800

$800

$1,000


With OOLSA-1105
$1,800

$1,800

----


Campanella Associates
3201 Ridgewood Drive
Columbus, Ohio 43026
614.876.5108 & FAX    //     cell=614-560-0519
Skype:  angelojcampanella

For more information on... Angelo J. Campanella, P.E., Ph.D., FASA (Principal)
a.campanella@att.net


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