AS NZS 16900.14:2021 pdf free download – Respiratory protective devices – Methods of test and test equipment

AS NZS 16900.14:2021 pdf free download – Respiratory protective devices – Methods of test and test equipment.
d) A suitable adaptor (see Figureb) for the microphone system and sound level meter.
e) A breathing machine or metabolic simulator as appropriate.
The test environment, including test enclosure should not include surfaces that can reflect sound from the specimen.
6.3 Procedure
a) The microphone(s) shall be mounted In the RPD headlorm at the position shown In Figure 5
b) The sound level meter and microphone system shall be calibrated using the specified sound level calibrator Isee 62 c1. The sound level calibrator Including the adaptorshall be tightly fitLed onto the microphone (See Figure 6). The sound level calibrator applies a sinusoidal tone to the microphone which is used by the sound level meter for calibration. The sound level calibrator and adaptor shall be removed after calibration.
c) The breathing machine or metabolic simulator shall be operated at the appropriate workrate for the class of the RPD.
d) The backgroLlnd noise level in the test room shall be measured, without the RPD Fitted to the RPD headform, but with the breathing machine or metabolic simulator operating, The background noise level shall be a maximum of 70 dHA.
e) With the breathing machine or metabolic simulator switched off or disconnected, the RPD shall be fitted on the RPI) headform and torso, making all the necessary adjustments to ensure a good lit with reference to the information supplied by the manufacturer.
f) Assisted filtering RPI) shall be operated as specified by the manufacturer at the manufacturer’s maximum flow conditions related to the workrate.
g) The breathing machine or metabolic simulator shall be switched back on or reconnected.
h) The I,Aeqr (A’welghLcd equivalent continuous sound pressure level) at both car positions shall be measured. Measurements shall be made over the period of time as required by the performance standard during continuous operation of the RPD.
d) A breathing machine or metabolic simulator as appropriate.
7.3 Procedure
a) The microphone(s) shall be mounted in the RPD headfnrm at the position shown in Figurel.
b) The sound levd meter and microphone system shall be calibrated using the specified sound level calibrator [see 72 c)J. The sound level calibrator including the adaptor shall he tightly fitted onto the microphone. See Eignre. The sound level calibrator applies a sinusoidal tone to the microphone which Is used by the sound level meter for calibration. The sound level calibrator and adaptor shall be removed alter calibration.
c) The RPD shall be fitted on the RPD headform and RPD torso, making all the necessary adjustments to ensure a good fit in accordance with information supplied by the manufacturer.
d) The breathing machine or metabolic simulator shall be operated at the appropriate workrate for the class of the RPD.
e) The RPD shall be operated as specified by the manufacturer at the workrate for Its class and the warning device shall be activated and operated during this time. Assisted filtering RPD shall be operated as specitied by the manufacturer at the manufacturer’s maximum flow conditions related to the workrate.
NOTE Modification olthe RPD can he necessary to permit the activation of the warning device.
1) The sound pressure level at the frequency range specified by the performance standards shall be measured during the operation of the warning device at the ear nearest to the warning device. Measurements shall be made over a period as required by the performance standards. While the RPD Is functioning, the background sound pressure level In the test room, at the frequency range specified by the performance standard, without the warning device operating, shall be a maximum of 80 dRA.
NOTE Modification of the RPD can he necessary to permit the activation of the warning device.
7.4 Test report For method B
The test repori shall include information regarding those parameters specified in iausi.4. together with the background sound pressure level and the minimum measured sound pressure levels measured at the ear nearest to the warning device at the specified frequency range generated by the warning device at the specified conditions. Report which ear was nearest to the warning device. The uncertainty of measurement shall be reported.