---
kind: "section"
citation: "40 C.F.R. § 1065.101"
title: "40"
number: "1065.101"
heading: "Overview."
url: "https://uscodex.org/cfr/40/1065.101"
---

# §1065.101. Overview.

- (a) **This subpart specifies equipment, other than measurement instruments, related to emission testing.** The provisions of this subpart apply for all engine dynamometer testing where engine speeds and loads are controlled to follow a prescribed duty cycle. See [subpart J](/cfr/40/subpartJ.md) of this part to determine which of the provisions of this subpart apply for field testing. This equipment includes three broad categories-dynamometers, engine fluid systems (such as fuel and intake-air systems), and emission-sampling hardware.
- (b) Other related subparts in this part identify measurement instruments ([subpart C](/cfr/40/subpartC.md)), describe how to evaluate the performance of these instruments ([subpart D](/cfr/40/subpartD.md)), and specify engine fluids and analytical gases ([subpart H](/cfr/40/subpartH.md)).
- (c) **Subpart J of this part describes additional equipment that is specific to field testing.**
- (d) Figures 1 and 2 of this section illustrate some of the possible configurations of laboratory equipment. These figures are schematics only; we do not require exact conformance to them. Figure 1 of this section illustrates the equipment specified in this subpart and gives some references to sections in this subpart. Figure 2 of this section illustrates some of the possible configurations of a full-flow dilution, constant-volume sampling (CVS) system. Not all possible CVS configurations are shown.
- (e) Dynamometer testing involves engine operation over speeds and loads that are controlled to a prescribed duty cycle. Field testing involves measuring emissions over normal in-use operation of a vehicle or piece of equipment. Field testing does not involve operating an engine over a prescribed duty cycle.

## Notes

### Amendments

[70 FR 40516, July 13, 2005, as amended at 73 FR 37292, June 30, 2008]

### Authority

Authority: 42 U.S.C. 7401-7671q.

### Source

Source: 70 FR 40516, July 13, 2005, unless otherwise noted.

### Amendments

[70 FR 40516, July 13, 2005, as amended at 73 FR 37292, June 30, 2008]