---
kind: "section"
citation: "21 C.F.R. § 874.1120"
title: "21"
number: "874.1120"
heading: "Electronic noise generator for audiometric testing."
url: "https://uscodex.org/cfr/21/874.1120"
---

# §874.1120. Electronic noise generator for audiometric testing.

- (a) **Identification.** An electronic noise generator for audiometric testing is a device that consists of a swept frequency generator, an amplifier, and an earphone. It is intended to introduce a masking noise into the non-test ear during an audiometric evaluation. The device minimizes the non-test ear's sensing of test tones and signals being generated for the ear being tested.
- (b) **Classification.** Class II (special controls). The device is exempt from the premarket notification procedures in [subpart E of part 807](/cfr/21/part807-subpartE.md) of this chapter subject to the limitations in [§ 874.9](/cfr/21/874.9.md).

## Notes

### Amendments

[51 FR 40389, Nov. 6, 1986, as amended at 84 FR 71813, Dec. 30, 2019]

### Authority

Authority: 21 U.S.C. 351, 360, 360c, 360e, 360j, 360 l, 371.

### Source

Source: 51 FR 40389, Nov. 6, 1986, unless otherwise noted.

### Amendments

[51 FR 40389, Nov. 6, 1986, as amended at 84 FR 71813, Dec. 30, 2019]