A method which involves placing a drop of fluid on a permeable piece of paper and noting the development and nature of the halos, or rings, surrounding the drop through time. The roots of this test can be traced to the 1940s, when railroads used the 'blotter spot' tests.


Related Terms

TRY VALVES

Test valves on a water column used to verify the water level when the gauge glass is out of service.

POPOV'S STABILITY CRITERION

A frequency domain stability test for systems consisting of a linear component described by a transfer function preceded by a nonlinear component characterized by an input-output function), with a unity gain feedback loop surrounding the series connection.

PLUG GAGE

A steel gage that is used to test the dimension of a hole; may be straight or tapered, plain or threaded, and of any crosssectional shape.

PILOT-SCALE CHEMICAL REACTION

Small-scale chemical reaction used to test operating conditions and product yields; used as a pilot for design of large-scale reaction systems.

PERMAFROST DRILLING

Boreholes drilled in 397 permeameter permeate in a test specimen of ferromagnetic material by a given magnetic intensity, to permit computation of the magnetic permeability of the material.

PERMANENT SET

Permanent plastic deformation of a structure or a test piece after removal of the applied load. Also known as set.

PENETRATION SPEED

The speed at which a drill can cut through rock or other material. penetration test

PENETRATION DEPTH

1. In induction heating, the thickness of a layer, extending inward from a conductor's surface, whose resistance to direct current equals the resistance of the whole conductor to alternating current of a given frequency. 2. The greatest depth in an ultrasonic test piece at which indications can be measured.

PEG COUNT METER

A meter or register that counts the number of trunks tested, the number of circuits passed busy, the number of test failures, or the number of repeat tests completed.

PEEL TEST

A test to ascertain the adhesive strength of bonded strips of metals by peeling or pulling the metal strips back and recording the adherence values.

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