potentiometer

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po·ten·ti·om·e·ter

(pō-ten'shē-om'ĕ-tĕr),
1. An instrument used for measuring small differences in electrical potential.
2. An electrical resistor of fixed total resistance between two terminals, but with a third terminal attached to a slider that can make contact at any desired point along the resistance.
[L. potentia, power, + G. metron, measure]

potentiometer

(pō-tĕn″shē-ŏm′ĕ-tĕr)
A voltmeter.

calibration potentiometer

A mechanically adjusted resistance used as a calibration control on many instruments. It adjusts a voltage or current within the device.
References in periodicals archive ?
A simulation of 1123/FB/03 compound preparation in a twin screw extruder was carried out with a 69 [cm.sup.3] Haake Rheocord mixing chamber, kept at 70[degrees]C (external temperature).
The PolyLab System consists of the Rheocord torque rheometer, which includes all functionality for driving and controlling the measuring sensors.
The firm's Rheocord 90 torque rheometer evaluates the flow properties of a variety of thermoplastics, including polyolefins, styrenes, and acrylics; engineering thermoplastics; and thermosetting resins.
The polymer was extruded on a twin-screw extruder PTW 16/25 D (Thermo electron poly lab system rheocord RC400P) with a film die, and then drawn by chilled rolls Scamex 3 rollers turning at several velocities.
The initial studies involved the use of the Haake Rheocord, System 90, fitted with two wing mixing rotors:
Pellets of PES/ PEN blends with different compositions (90/10, 75/25, 25/75, 10/ 90 percent by weight) were prepared by using a twin screw extruder (Rheocord PTW25P, Haake, Germany).
The extruder was a conical counter-rotating twin screw driven by a Haake Rheocord. All samples were extruded into a water bath and were fully cooled prior to being coiled.
Blending is performed with an internal mixer (Haake Rheocord 9000) at 160[degrees]C and 60 rpm for 15 min.
All mixing of carbon black filled compounds was done on a Haake Rheocord 90 using an initial temperature of 50 [degrees] C and a mixer speed of 1.5 Hz unless otherwise noted.
A two-step processing method was introduced to prepare the dynamically vulcanized PP/NBR/ZDMA blends, in which the NBR and ZDMA were firstly mixed to get rubber compounds (four weight ratios of NBR/ZDMA were carried out: 100/5, 100/10, 100/20, and 100/30), and then the rubber compounds were blended with PP melt in an internal mixer (Haake Rheocord 90) by mixing of the components in a melt at a temperature lower than 170[degrees]C, and at a rotor speed of 70 rpm.
A Haake Buchler Rheocord 750 laboratory internal mixer, which has two non-intermeshing counter-rotating rotors and electrical heater in the barrel wall, was used.