Ohm

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Ohm

A Swedish unit of volume approximately equivalent to 150 liters.
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Table 1--Electrical Properties of Solvents Solvent Type Resistance, Megohms Dielectric Constant Alcohols ([C.sub.1] - [C.sub.4]) 0.02-0.22 18-40 Glycol ethers 0.01-0.15 10-24 Ketones ([C.sub.2] - [C.sub.5]) 0.05-1.5 12-28 Glycol ether esters 1.6-13 6-9 Esters ([C.sub.2] - [C.sub.4]) 19->20 5-6 Aromatic hydrocarbons >20 2-2.4 Aliphatic hydrocarbons >20 1.9-2
They provide greater than 5,000 Megohms at 400 VDC and exhibit no evidence of breakdown or flashover when tested in IAW MIL-STD-1344, Method 3003.
Resistive sensors are very non-linear, and impedance (there is a capacitive component) can vary from many megohms at 10 percent RH to kilohms at 80 percent RH.
Measures 200mVDC to 1000VDC, 200VAC to 750VAC, 200 micro AMPS to 10 AMPS, 200 ohms to 2 megohms. Includes diode and transistor check, auto reverse polarity, zero adjust, overload protection and low battery indicator.
Initial contact resistance of 10 milliohms maximum, insulation resistance of 100 megohms minimum, and dielectric strength of 3000 V rms between terminals and frame.
(Seminole, FL) has patented a gel formulation combined with a fungicidal concentrate which is a liquid mixture of about 1.2 to 16 ml parts by volume of ultra pure water having an electrical resistance of 16 26 megohms, total dissolved solids of less than 0.04 parts per million and a specific conductance of less than 0.10 mho with about 1.2 to 16 parts by volume of Willard Water as prepared in accordance with United States Patent 3,893,943, together with one liter of a gel formulation ingredient containing 10% by weight urea, based on the weight of the gel formulation.
In August, UK-based Purite launched the Select Fusion, a system that can dispense both Type II and ultrapure water (18.2 megohms resistivity) from a single unit.
Suitable for attachment to semi-rigid cable, the BMMA series connectors are designed for DC to 28 GHz applications, provide 50 [ohms] impedance, 675 VRMS dielectric withstanding voltage, 5000 megohms min.
Early detectors were not compensated, with a high (megohms) resistor replacing the centre electrode to cathode in our analogy (Figure 2).
COMPONENTS FOR A MAGNETOMETER (Radio Shack part numbers in parentheses) Item Remarks Magnetic compass Needs to have transparent housing Op-amp integrated LM-741 circuit or equivalent (276-007) Resistor 820 ohms, 1/2 watt (271-022) Resistor 4.7 megohms, 1/4 watt (can use five 1-megohm resistors, 271-1356, in series) Light-emitting diode Infrared type (276-143) Phototransistor Infrared-sensitive NPN type (276-145) Solenoid The coil of a dismantled reed relay (about 20,000 turns of 0.06-mm wire) Rod Made of soft iron, about 50 mm long Potentiometer 10-kilohms, 15-turn type (271-343) Power supply Regulated, +15 and -15 volts DC, 100 milliamperes Circuit board (276-147) Sheets of acrylic Ideally 8 mm thick for rigidity
Static wicks are high-resistance devices (anywhere from 6 to 200 megohms resistance) that have a much lower corona voltage than the surrounding airframe structure they are attached to.