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1

"

 Pressure 

Microphone  

Type 40EN 

1

"

 to ½

"

 Adapter 

RA0017

½

"

 to ¼

"

  

Adapter  

RA0003,

NOT Included  

with the  

¼

"

 

Preamplifier 

 

Type 26AS 

¼

"

 Preamplifier, Short

 

Type 26AS * 

1

"

 to ½

"

  

Microphone 

Adapter 

RA0058

1

"

 Microphone  

Protection 

Grid  

RA0177

½

"

 to ¼

"

 Adapter 

GR0010

(included with the 

¼

"

 Preamplifier)

½

"

 Pressure 

Microphone  

Type 40AP,

 protection  

grid removed

½

"

 Pressure 

Microphone  

Type 40AD,

 protection  

grid removed

¼

"

 Preamplifier, Short

 

Type 26CS * 

Cable AA0018 

     G.R.A.S. SOUND & VIBRATION

Page 8

Hearing-Protector Test Fixture Type 45CA  

  Fig. 4.1  Assembly options (exploded view)

4 

Configuration with Pressure Microphone, 

 

 1

"

 Type 40EN or ½

"

 Type 40AP/40AD

Applications

Insertion Loss of Ear Muffs. If Microphone 1

"

 Type 40EN is used, the configuration is in conform

-

ity with ISO 4869-3.

Required Accessories

• 

The parts shown in Fig. 4.1 (choose one of the three assembly options)

• 

Pistonphone Type 42AP (recommended) or Type 42AA

• 

Test instruments such as those shown in Fig. 4.14

4.1 

Assembling Microphone and Preamplifier

Fig. 4.1 displays three options for the microphone/preamplifier assembly required for the meas

-

urements.

              

 1

"

 Type 40EN   OR    ½

"

 Type 40AP       OR      ½

"

 Type 40AD

_____________
 *  For space limitations, the super-short ¼

"

 Preamplifier Type 26AS/Type 26CS (shown) is required for binaural measure-

 

  ments. For monaural measurements, replaceType 26AS with Type 26AC and Type 26CS with Type 26CB.

Содержание 45CA

Страница 1: ...Instruction Manual Hearing Protector Test Fixture Type 45CA Skovlytoften 33 2840 Holte Denmark www gras dk gras gras dk SOUND VIBRATION G R A S ...

Страница 2: ...Revision 28 November 2013 LI0024 ...

Страница 3: ...4 4 5 Typical Application Setup 15 5 Configuration with IEC 60318 Ear Simulator RA0039 16 5 1 Ear Simulator Preamplifier Assembly 16 5 2 Calibration 17 5 3 Completing the Assembly 18 5 4 Mounting Assembly into Test Fixture 19 5 5 Typical Application Setup 22 6 Configuration with IEC 60711 Ear Simulator RA0045 or RA0045 S1 23 6 1 Assembling Ear Simulator and Preamplifier 23 6 2 Mounting the Assembl...

Страница 4: ...C 60318 4 Ear Simulator RA0045 IEC 60318 IEC 60318 1 Ear Simulator RA0039 1 1 Main Features The Test Fixture Type 45CA provides for reliable and exact measurements and was designed with the following features The test fixture mounted on a resilient base Fig 1 1 that reduces the noise floor to a mini mum in a typical test situation Foam plugs and grease Fig 1 1 are supplied to avoid sound leakage a...

Страница 5: ...be configured with a microphone externally polarized or prepolarized IEC 60711 Configuration with Ear Simulator RA0045 These ear simulators are for use with a pinna simulator artifical ear for measuring the sound pressure at the eardrum DRP thus also applicable for ear inserts RA0045 available both in externally polarized or prepolarized versions Standard ISO 4869 3 IEC 60318 IEC 60711 Test Setup ...

Страница 6: ...ient base GR0986 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 Delivered Components 2 x Cover plate GR1085 1 x Test fixture head 1 x Allen screw 6 mm SK1544 Fig 2 1 Parts delivered in the Type 45CA box 2 x Insert GR0970 Tube of Sealing Grease MI0016 2 x Foam Plug GR1281 ...

Страница 7: ...se 3 After making sure both of the 1 5 mm Allen grub screws 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 5 mm Allen grub screws on the steel tube Fig 3 4 IMPORTANT Tighten both of these 1 5 mm Allen grub screws Fig 3 3 Fig 3 4 Test fixture head...

Страница 8: ...Microphone 1 Type 40EN or Type 40AP 40AD Applications Insertion Loss of Ear Muffs If Microphone 1 Type 40EN is used the configuration is in conform ity with ISO 4869 3 Required Accessories The parts shown in Fig 4 1 choose one of the three assembly options Pistonphone Type 42AP recommended or Type 42AA Test instruments such as those shown in Fig 4 14 4 1 Assembling Microphone and Preamplifier Fig ...

Страница 9: ...h optional 1 coupler adapter For instructions on calibrating the microphone preamplifier assembly refer to the piston phone s instruction manual The Pistonphone Type 42AP is delivered with an adapter for calibrating 1 microphones Fig 4 2 Assembly of 1 microphone and preamplifier to be calibrated G R A S SOUND VIBRATION Page 9 Hearing Protector Test Fixture Type 45CA ...

Страница 10: ...ted at delivery G R A S SOUND VIBRATION Page 10 Hearing Protector Test Fixture Type 45CA 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 4 3 and separate the head from the pedestal Up Insert GR0970 Allen grub screws 1 5 mm Right Cover plate GR1085 Screws 2 0 mm Hole for screw 1 5 mm ...

Страница 11: ...neck 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 the other while keeping the cable behind the plugs Fig 4 8 7 If required for meeting your requirements for acoustic isolation apply Grease MI0016 to seal leakage points Fig 4 9 Fig 4 8 Fig 4 9 2 x Foa...

Страница 12: ...the pedestal Fig 4 10 Note Do not forget to tighten both of the 1 5 mm Allen grub screws To Power module Head Microphone preamplifier assembly Pedestal Tube Split hole Slides on and off the pedestal Fig 4 10 Cabeling for the microphone preamplifier assembly Always tighten both of the 1 5 mm screws ...

Страница 13: ...microphone s diaphragm must be level in the vertical plane with the slanting surface of the head For Microphone Type 40EN this will be the case when the center of the protection grids sticks out by 1 89 mm in the vertical plane with the slanting surface of the head Use the grub screws to pinch the microphones lightly to hold them in position Note If you cannot get the microphone positioned to the ...

Страница 14: ... 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 Type 45CA push Plug GR1079 into the hole as far as it will go For sound leakage sealing apply Silicon Grease MI0016 to the plug 5 Type 45CA is now ready to be tested for acoustic isolation Fig 4 15 Fig 4 12 Fig 4 13 Fig 4 14 Fig 4 15 A...

Страница 15: ...or simulating a signal generator capable of gen erating the required test signals an audio frequency analyser capa ble of octave band analyses Loudspeaker To analyzer Power amplifier Ear muffs under test Power Module Type 12AK From preamplifier Test Fixture Type 45CA G R A S Power Module Type 12AK Gain 20 10 30 40 50 0 HP Dir Lin AW Filter Overload Inst Latch SysCh Adjust Power On Ovl Reset Low Ba...

Страница 16: ...ting ear inserts earphones and earplugs Required Accessories The items of one of the two assembly options shown in Fig 5 1 Pistonphone Type 42AP recommended or Type 42AA Test equipment such as the instruments shown in Fig 5 15 5 1 Ear Simulator Preamplifier Assembly Fig 5 1 displays the two options for configuration with Ear Simulator RA0039 Note Do not assemble the parts yet proceed to Section 5 ...

Страница 17: ... on calibrating the microphone preamplifier assembly Fig 5 3 see the Pistonphone Type 42AP or Type 42AA instruction manual Fig 5 3 microphone and preamplifier to be calibrated to Adapter GR0010 included with the preamplifiers Externally Polarized Microphone Type 40AG CCP Preamplifier Type 26CB Prepolarized Microphone Type 40AO Fig 5 2 Assembling the parts required for the calibration Cable AA0018 ...

Страница 18: ...ig 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 VIBRATION Page 18 Hearing Protector Test Fixture Type 45CA ...

Страница 19: ...t Cover Plate GR1085 already mounted at delivery Remove Insert GR0970 Fig 5 8 Test fixture Type 45CA prepared for the RA0039 assembly Up Recess for screw 1 5 mm Cover plate GR1085 Insert GR0970 Right Screws 2 0 mm 2 Using Allen key 1 5 mm loosen the grub screw Fig 5 8 and separate the head from the pedestal Allen grub screws 1 5 mm ...

Страница 20: ...ck 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 the other while keeping the cable behind the plugs Fig 5 13 7 If required for meeting your requirements for acoustic isolation apply Grease MI0016 to seal leakage points Fig 5 14 Fig 5 13 Fig 5 14 2 ...

Страница 21: ...Pedestal 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 RA0039 assembly Grub screw for holding the microphone in position Use Allen key 2 5 mm YY0016 Tighten both of the 1 5 mm screws ...

Страница 22: ...ype 45CA G R A S Power Module Type 12AK Gain 20 10 30 40 50 0 HP Dir Lin AW Filter Overload Inst Latch SysCh Adjust Power On Ovl Reset Low Batt Signature Series Output Input 080014 G R A S ISO 4869 3 Hearing protector Test Fixture Type 45CA Serial No XXXXX 080001 G R A S SOUND VIBRATION Page 22 Hearing Protector Test Fixture Type 45CA 5 5 Typical Application Setup Fig 5 17 shows a block diagram of...

Страница 23: ...eamplifier Type 26CB for monaural measurements only Type 26CS CCP preamplifier allowing binaural measurements Applications Hearing protection devices ear muffs earplugs Sound sources headphones supra aural circum aural earphones Required Accessories The parts shown in one of the three assembly options Fig 6 1 KEMAR Pinna Simulator artificial ear one of the types listed in section 6 4 Pinna Holder ...

Страница 24: ...test fixture 1 Remove Cover Plate GR1085 and Insert GR0970 Fig 6 2 Fig 6 2 Test fixture Type 45CA cover plate and insert removed Hole for 1 5 mm screw Cover plate GR1085 Insert GR0970 2 Replace the 1 5 mm screw in base of recess Fig 6 3 The socket headcap screw is used as locator for the pinna Fig 6 3 Allen grub screws 1 5 mm Recesses for 2 0 mm screws 1 5 mm screw ...

Страница 25: ...neck 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 other while keeping the cable behind the plugs Fig 6 8 7 If required for meeting your requirements for acoustic isolation apply Grease MI0016 to seal leakage points Fig 6 9 Fig 6 8 Fig 6 9 2 x Foa...

Страница 26: ...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 surface Grub screw for lightly pinching and holding the coupler in position Use Allen key 2 5 mm YY0016 Fig 6 11 Always tighten both of the 1 5 mm screws ...

Страница 27: ...pter RA0157 must be ordered separately LED Display 2 Mount the Calibration Adapter RA0157 into the pistonphone 1 Loosen the pistonphone s retention collar 3 a Switch on the pistonphone via the I O button b Check that the LED is showing green c Place the pistonphone Type 42AP shown carefully onto the ear canal Note Hold the pistonphone strictly horizontally Fig 6 12 Fig 6 13 Fig 6 14 G R A S SOUND ...

Страница 28: ...ng sure that it locates with the screw in the recess push the pinna into the recess so that it makes full contact with the base of the recess Fig 6 15 2 Make sure the pinna edge is flush with the test fixture surface all the way around Mount the Cover Plate RA0172 must be ordered separately using the four 2 0 mm screws supplied with it This cover plate will keep the pinna in place Fig 6 16 Fig 6 1...

Страница 29: ...re and software for simulating a signal generator capable of gen erating the required test signals an audio frequency analyser capa ble of octave band analyses Loudspeaker To analyser Power amplifier Earplug under test Power Module Type 12AK From Ear Simu lator RA0045 Test Fixture Type 45CA G R A S Power Module Type 12AK Gain 20 10 30 40 50 0 HP Dir Lin AW Filter Overload Inst Latch SysCh Adjust P...

Страница 30: ...Built in accordance with ISO 4869 3 can also be used with two microphones for binaural testing Weight 11 6kg Dimensions in millimeters and inches 53 00 mm 394 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 Ø Ø Ø ...

Страница 31: ... configuration For reasons of space the short preamplifiers are required for binaural measurements that is Type 26AS for externally polarized configurations Type 26CS for prepolarized configurations For monaural measurements you can also use Type 26AC for externally polarized configuration Type 26CB for prepolarized configuration The 26AS and 26AC used for the externaly polarized con figurations h...

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