Audiometric equipment is classified as screening or diagnostic equipment and ranges from type 1 to type 4.
| 6.1 | Screening Audiometric Equipment |
| 6.1.1 | At least a type 4 audiometer is used for obtaining hearing threshold limits for baseline, entry, initial, periodic and exit audiometric tests. |
| 6.1.2 | A type 4 audiometer, specified in IEC 60645, must be used for pure-tone air-conduction measurements of hearing thresholds at the frequencies: 500, 1 000, 2 000, 3 000, 4 000, 6 000 and 8 000 Hz. |
| 6.1.3 | The type 4 audiometer specified in IEC 60645 provides for measuring amplitude from at least -10 dB to 90 dB. |
| 6.2 | Diagnostic Audiology Equipment |
| 6.2.1 | At least a type 3 audiometer is used for obtaining hearing threshold limits for the batch of diagnostic audiology tests. |
| 6.2.2 | A type 3 audiometer specified in IEC 60645 must be used to measure the hearing thresholds at the frequencies: 125, 500, 1 000, 2 000, 3 000, 4 000, 6 000 and 8 000 Hz and must include at least the following batch of tests— |
| (a) | otoacoustic emission testing; |
| (b) | pure-tone air-conduction; |
| (c) | pure-tone bone-conduction; |
(e) speech discrimination.
| 6.2.3 | The type 3 audiometer specified in IEC 60645 provides for measuring amplitude from at least -10 dB to 90 dB. |
