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GRAS 45CA-1 Instruction Manual Download Page 27

45CA-7 to -12

As described on page 22 the anthropometric pinna is mounted directly on the Ear Simulator, 
without the use of en ear canal extension. Therefore, for calibration with a pistonphone with a 
1/2” coupler, the ear simulator and the anthropometric pinna must be removed to allow mounting 
of the GR0408 External Ear Canal.

Removing the Ear Simulator and Anthropometric Pinna

1. 

Loosen the screw holding the ear simulator, see  Fig. 7 on page 

22.

2. 

Gently pull out the assembly.  See also Fig. 8 on page 

23.

Important. 

Do NOT pull at the ear lobe.

GR0917

GR0924

GR1440B

RA0045

26A

S

45EA

46BP

RA0241

40A

G

GS0158

GR0010

46BD

1

2 4

3 5

L

B-2

B-1

0

20

10

01

02

0

J

GR1153

46BP

-1

40A

D

GR0917

GR0924

GR1440B

RA0045

26A

S

45EA

46BP

RA0241

40A

G

GS0158

GR0010

46BD

1

2 4

3 5

L

B-2

B-1

0

20

10

01

02

0

J

GR1153

46BP

-1

40A

D

Fig. 13. 

Removing the anthropometric pinna from the ear simulator.

3. 

Unscrew the pinna simulator from the ear simulator

4. 

Mount the external ear canal with the union nut onto the ear simulator.

GR0917

GR0924

GR1440B

RA0045

26A

S

45EA

46BP

RA0241

40A

G

GS0158

GR0010

46BD

1

2

4

3

5

L

B-2

B-1

0

20

10

01

02

0

J

GR1153

46BP

-1

40A

D

GR0917

GR0924

GR1440B

RA0045

26A

S

45EA

46BP

RA0241

40A

G

GS0158

GR0010

46BD

1

2

4

3

5

L

B-2

B-1

0

20

10

01

02

0

J

GR1153

46BP

-1

40A

D

GR0409 
Union Nut

GR0408 

 

External Ear Canal

RA0045/-S1 or RA0401/2 
Ear Simulator

Fig. 14. 

Showing the External Ear Canal and Union Nut. For clarity, preamplifier and cable are not shown. 

You are now ready to calibrate. The Ear Simulator fits directly into a pistonphone with a 1/2” cou

-

pler. Refer to your pistonphone manual for further information. See the corrections factors in the 

table below.

Instruction Manual  

45CA Headphone/Hearing-protector Test Fixture   |   2 7

Summary of Contents for 45CA-1

Page 1: ...Instruction Manual GRAS 45CA Headphone Hearing protector Test Fixture LI0187 29 August 2019...

Page 2: ...Hi Res Configurations added Copyright Notice 2016 2019 GRAS Sound Vibration A S www gras dk Any technical documentation that is made available by GRAS is the copyrighted work of GRAS and is owned by...

Page 3: ...e CCP 13 45CA 9 Headphone Hearing protector Test Fixture High Frequency LEMO 14 45CA 10 Headphone Hearing protector Test Fixture High Resolution CCP 15 45CA 11 Headphone Hearing protector Test Fixture...

Page 4: ...y Polarized microphones 45CA 4 RA0039 IEC 60318 1 Ear Simulators RA0039 with 40AO Pre polarized Microphones Testing of Headphones Earplugs and Insert Earphones For testing of headphones and insert ear...

Page 5: ...y Included Items Test Fixture Acoustic Cup 1 GR0974 Acoustic Plug 1 RA0178 Foam Plug 2 GR1281 Sealing Grease 1 MI0016 Allen Key 6 mm 1 YY0019 Allen Key 2 5 mm 1 YY0016 Allen Key 2 mm 1 YY0018 Allen Ke...

Page 6: ...nally polarized pressure microphone This configuration conforms with ISO 4869 3 45CA 1 is delivered fully configured individually calibrated and ready for use The following configuration specific item...

Page 7: ...tion specific items are included Included Items 1 2 Prepolarized Pressure Microphone High Sensitivity Used without its protection grid 2 x 40AD 1 Microphone protection Grid 2 x RA0177 1 2 to 1 Microph...

Page 8: ...cific items are included Included Items IEC 60318 1 Ear Simulator 2 x RA0039 1 2 Externally Polarized Pressure Micro phone 2 x 40AG 1 2 to 1 Adapter for RA0039 2 x RA0176 1 2 to 1 4 Adapter 2 x GR0010...

Page 9: ...items are included Included Items IEC 60318 1 Ear Simulator 2 x RA0039 1 2 Prepolarized Pressure Microphone 2 x 40AO Adapter 2 x RA0176 1 2 to 1 4 Adapter 2 x GR0010 1 4 Preamplifier 2 x 26CS Microdo...

Page 10: ...luded Included Items Large right and left KEMAR pinna KB0070 KB0071 Pinna Holder Plate 2 x GR1075 Ear Canal Extension 2 x GR1069 IEC 60318 4 Externally Polarized Ear Simulator 2 x RA0045 1 2 to 1 4 Ad...

Page 11: ...anal Extension 2 x GR1069 IEC 60318 4 Prepolarized Ear Simulator 2 x RA0045 S1 1 2 to 1 4 Adapter 2 x GR0010 1 4 Preamplifier short 2 x 26CS Microdot to BNC Cable 3 m 2 x AA0018 GR0917 GR0924 GR1440B...

Page 12: ...left anthropometric pinnae KB5010 KB5011 30 40 45 55 60 3 30 40 45 55 60 5 3 0 5 5 5 0 30 40 45 55 60 3 30 40 45 55 60 5 3 0 5 5 5 0 Pinna Holder Plate 2 x GR1075 GR0917 GR0924 GR1440B RA0045 26AS 46...

Page 13: ...0 5 3 0 5 5 5 0 30 40 45 55 60 3 30 40 45 55 60 5 3 0 5 5 5 0 Pinna Holder Plate 2 x GR1075 GR0917 GR0924 GR1440B RA0045 26AS 46BP RA0241 40AG GS0158 46BD GR1153 46BP 1 IEC 60318 4 Prepolarized Ear Si...

Page 14: ...left anthropometric pinnae KB5010 KB5011 30 40 45 55 60 3 30 40 45 55 60 5 3 0 5 5 5 0 30 40 45 55 60 3 30 40 45 55 60 5 3 0 5 5 5 0 Pinna Holder Plate 2 x GR1075 GR0917 GR0924 GR1440B RA0045 26AS 46B...

Page 15: ...45 55 60 5 3 0 5 5 5 0 Pinna Holder Plate 2 x GR1075 GR0917 GR0924 GR1440B RA0045 26AS 46BP RA0241 40AG GS0158 46BD GR1153 46BP 1 Prepolarized High Frequency Ear Simulator 2 x RA0402 GR0917 GR0924 GR...

Page 16: ...specific items are included Included Items Large right and left anthropometric pinnae KB5010 KB5011 30 40 45 55 60 3 30 40 45 55 60 5 3 0 5 5 5 0 30 40 45 55 60 3 30 40 45 55 60 5 3 0 5 5 5 0 Pinna H...

Page 17: ...nthropometric pinnae KB5010 KB5011 30 40 45 55 60 3 30 40 45 55 60 5 3 0 5 5 5 0 30 40 45 55 60 3 30 40 45 55 60 5 3 0 5 5 5 0 Pinna Holder Plate 2 x GR1075 GR0917 GR0924 GR1440B RA0045 26AS 46BP RA02...

Page 18: ...45CA shore 35 KB1071 KEMAR Right Anthropometric Pinna for GRAS 45CA KB5010 KEMAR Left Anthropometric Pinna for GRAS 45CA KB5011 Power Modules 2 Channel Universal Power Module with signal conditioning...

Page 19: ...ion loss of ear muffs For measurement of the sound quality of headphones 45CA 3 or 45CA 4 can be used They are configured with RA0039 Ear Simulators and 40AG 1 2 externally polarized or 40AO 1 2 prepo...

Page 20: ...st signals an audio frequency analyser capable of octave band analyses Loudspeaker To analyzer Power amplifier Earplug under test 12AA Power Module From RA0045 Ear Simulators 45CA Test Fixture G R A S...

Page 21: ...be used This kit is included with 45CA configurations from 45CA 5 to 45CA 10 It comprises a cover plate four screws and an ear holder 1 Make sure that the recess in the pinna locates with the screw in...

Page 22: ...5 3 4 6 B P 1 4 0 A D G R 0 9 1 7 G R 0 9 2 4 G R 1 4 4 0 B R A 0 0 4 5 2 6 A S 4 5 E A 4 6 B P R A 0 2 4 1 4 0 A G G S 0 1 5 8 G R 0 0 1 0 4 6 B D 1 2 4 3 5 L B 2 B 1 0 2 0 1 0 0 1 0 2 0 J G R 1 1 5...

Page 23: ...om 45CA Pressure Equalization 45CA is furnished with capillary equalization tubes that connect the cavity under the ear muffs to the external air When these tubes are not sealed the pressure build up...

Page 24: ...lding the microphone in position Use Allen key 2 5 mm YY0016 Fig 10 The microphone can be removed for calibration when the insert and cover plate have been re moved When reinstalled it must be located...

Page 25: ...A proper calibration requires that the microphone is dismantled and calibrated sepa rately Verification The 45CA 3 and 45CA 4 can be verified in situ using the Calibration Adapter RA0287 S n i t A A...

Page 26: ...ic ambient pressure Refer to your pistonphone manual for detailed calibration instructions When calibration has been done install the microphone in the coupler and the coupler in the test fixture by r...

Page 27: ...4 0 A G G S 0 1 5 8 G R 0 0 1 0 4 6 B D 1 2 4 3 5 L B 2 B 1 0 2 0 1 0 0 1 0 2 0 J G R 1 1 5 3 4 6 B P 1 4 0 A D Fig 13 Removing the anthropometric pinna from the ear simulator 3 Unscrew the pinna simu...

Page 28: ...erent pinna used 45CA 1 to 12 with Standard Ear Simulator RA0045 series and RA040X series In situ calibration without dismantling Accessories Correction factor 42AP and 42AA RA0157 0 62 dB The cover p...

Page 29: ...4 00 mm 155 60 mm G R A S ISO 4869 3 Hearing protector Test Fixture Type 45CA Serial No XXXXX 200 00 mm 135 00 mm 5 32 15 51 2 09 7 87 6 13 45CA 1 and 45CA 2 Self Insertion Loss measured with closed e...

Page 30: ...suring apparatus Artificial ears Frequency Response Typical frequency response Sensitivity Sensitivity 12 5 mV Pa Dynamic Range with 40AG 20 dBA to 164 dB with 40AO 20 dBA to 163 dB Dimensions Height...

Page 31: ...can National Standard For an Occluded Ear Simulator Frequency Response Typical transfer impedance re 500 Hz Resonance frequency 13 5 kHz 1 kHz Sensitivity Sensitivity 12 5 mV Pa Dynamic Range RA0045 L...

Page 32: ...2009 American National Standard For an Occluded Ear Simulator Frequency Response Typical transfer impedance re 500 Hz Resonance frequency 13 5 kHz 1 kHz Sensitivity Sensitivity 12 5 mV Pa Dynamic Ran...

Page 33: ...ional Standard For an Occluded Ear Simulator Frequency Response Typical transfer impedance re 500 Hz Resonance frequency 13 5 kHz 1 kHz Sensitivity Sensitivity 1 6 mV Pa Dynamic Range RA0403 LEMO 44 d...

Page 34: ...s that are damaged due to negligent use an incorrect power supply or an incorrect connection to the equipment Service and Repairs All repairs are made at GRAS International Support Center located in D...

Page 35: ...Part 2 Appendix Assembly...

Page 36: ...G R A S SOUND VIBRATION 2 45CA Headphone Hearing Protector Test Fixture...

Page 37: ...Acoustic Isolation Testing 12 5 45CA 3 and 45CA 4 with IEC 60318 1 Ear Simulator RA0039 13 5 1 Ear Simulator Preamplifier Assembly 13 5 2 Calibration 13 5 3 Completing the Assembly 14 5 4 Mounting the...

Page 38: ...ion specific configurations are assembled 1 2 The Test Fixture The test fixture is mounted on a resilient base Fig 1 1 that reduces the noise floor to a mini mum in a typical test situation Foam plugs...

Page 39: ...R0986 1 x Test fixture neck Allen keys 1 x 6 0 mm YY0019 1 x 2 5 mm YY0016 1 x 2 0 mm YY0018 1 x 1 5 mm YY0012 2 Components 2 x Cover plate GR1085 1 x Test fixture head 1 x Allen screw 6 mm SK1544 Fig...

Page 40: ...in the head s steel tube are loosened to their extreme positions place the head onto the pedestal and carefully slide the steel tube onto the top of the pedestal s neck Fig 3 3 4 Tighten both of the 1...

Page 41: ...n Fig 4 1 4 1 Assembling Microphone and Preamplifier Fig 4 1 displays the microphone preamplifier assembly Fig 4 1 Assembly options exploded view 40EN 1 Pressure Microphone RA0017 1 to Adapter RA0003...

Page 42: ...mounted at delivery G R A S SOUND VIBRATION 8 45CA Headphone Hearing Protector Test Fixture Fig 4 3 Cover plate and insert to be mounted 2 Using Allen key 1 5 mm loosen the two 1 5 mm grub screws Fig...

Page 43: ...eck slide the cable into the inner slot hole of the rubber pad on top Fig 4 7 Fig 4 6 Fig 4 7 6 Push the two Foam Plugs GR1281 into the cable guide right underneath the rubber pad one plug on top of t...

Page 44: ...he pedestal Fig 4 10 Note Do not forget to tighten both of the 1 5 mm Allen grub screws Fig 4 10 Cabeling for the microphone preamplifier assembly To Power module Head Microphone preamplifier assembly...

Page 45: ...rophone s diaphragm must be level in the vertical plane with the slanting surface of the head For the 40EN Microphone this will be the case when the center of the protection grids sticks out by 1 89 m...

Page 46: ...ow facing the microphone into the recess surrounding the microphone until it makes contact with the base of the recess Fig 4 13 4 Fig 4 14 On the opposite side of the 45CA push Plug GR1079 into the ho...

Page 47: ...icrophone Required Accessories The items of one of the two assembly options shown in Fig 5 1 5 1 Ear Simulator Preamplifier Assembly 5 2 Calibration Refer to part 1 of this manual G R A S SOUND VIBRAT...

Page 48: ...g 5 4 2 Place the adapter RA0176 Fig 5 5 3 Remount the microphone Fig 5 6 4 Screw Ear Simulator RA0039 onto the assembly Fig 5 7 Complete assembly NB Threaded side must face upwards G R A S SOUND VIBR...

Page 49: ...g 5 8 Mount Cover Plate GR1085 already mounted at delivery Remove Insert GR0970 Fig 5 8 45CA test fixture prepared for the RA0039 assembly Up Recess for screw 1 5 mm Cover plate GR1085 Insert GR0970 R...

Page 50: ...k slide the cable into the inner slot hole of the rubber pad on top Fig 5 12 Fig 5 11 Fig 5 12 6 Push the two Foam Plugs GR1281 into the cable guide right underneath the rubber pad one plug on top of...

Page 51: ...edestal Tube Fig 5 15 8 Replace the head onto the pedestal Fig 5 15 Note Do not forget to tighten the two 1 5 mm Allen grub screws Fig 5 16 9 Insert the RA0039 assembly firmly into the recess Fig 5 16...

Page 52: ...r Simulator and anthro pometric pinnae read sections 6B and 6B 1 and continue with 6 2 6A 45CA 5 and 45CA 6 with IEC 60318 4 Ear Simulator 45CA 5 with externally polarized Ear Simulator RA0045 45CA 6...

Page 53: ...he parts as shown in Fig 6B 1 and 6B 2 If the cable has been removed it must be fed through the head in the same way as shown on page 21 Fig 6B 2 Assembly details RA0045 or RA0401 Ear Simulator GR0010...

Page 54: ...ssembly into the test fixture 1 Remove Cover Plate GR1085 and Insert GR0970 Fig 6 2 Fig 6 2 Cover plate and insert removed Hole for 1 5 mm screw Cover plate GR1085 Insert GR0970 2 Replace the 1 5 mm s...

Page 55: ...k slide the cable into the inner slot hole of the rubber pad on top Fig 6 7 Fig 6 6 Fig 6 7 6 Push the two Foam Plugs GR1281 into the cable guide right underneath the rubber pad one plug on top of the...

Page 56: ...e head onto the pedestal Note Do not forget to tighten the two 1 5 mm screws Fig 6 10 To Power module Head Microphone preamplifier assembly Pedestal Tube Press until inner edge is flush with recess su...

Page 57: ...hore 00 55 How the anthropometric pinnae are mounted are shown in section 6 B on page 18 1 Making sure that it locates with the screw in the recess push the pinna into the recess so that it makes full...

Page 58: ...tive 93 68 EEC Manufactured to conform with RoHS directive 2002 95 EC G R A S Sound Vibration reserves the right to change specifications and accessories without notice G R A S SOUND VIBRATION 24 45CA...

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