Test instrumentation has been touched on, but a few additional comments are appropriate at this point. The code provides guidance test arrangements and instrumentation. It includes details on sensor point location as well as pressure tap construction. Flow measurement is defined in detail.

One of the critical measurements is torque or shaft power. A variety of methods is recognized: direct methods such as torque meters or reaction mounted drivers (dynamometers) and indirect methods such as electrical power input to drive motors, heat balance, or heat input to a loop cooler, See Part 7, Measurement of Shaft Power, PTC 19.7 1961 [3] for additional information.

If a preference were to be given, it would be listed in the order stated above, recognizing that the dynamometer is limited in size, but works well with the PTC 9 class of equipment.

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