When an object moves back and forth, it is said to vibrate. This vibration disturbs the air particles near the object and sets them vibrating, producing a variation in normal atmospheric pressure. The disturbance spreads and, when the pressure variations reach our ear drums, they too are set to vibrating…

ET Labs is a premier calibration laboratory that is accredited by A2LA for DC Resistance-Measure and DC Resistance-Generate. We can calibrate most resistance standards, transfer standards or resistance decades from 0.01 Ω — 10 TΩ with uncertainties as good as 0.16 µΩ/Ω1. Please contact our sales staff, by phone or online, who will be pleased to give you a quote for the calibration or repair of your equipment.

Insulation resistance of materials is one of several parameters that may indicate the condition of insulation. An insulation test is to measure the resistance offered by the insulating members of a component part to an impressed direct voltage tending to produce a leakage of current through or on the surface…

Characteristic cable impedance (Zo) is a very important measurement in determining a cable’s transmission capability. Maximum power is transmitted when the source has the same impedance as the load. Therefore the cable (line) should have the same characteristic impedance as the transmission equipment. The Zo of the transmitting equipment drives…

More from PART I. THE EARLY EXPERIMENTERS 1775–1915 Probably Henry Cavendish (1731–1810) made the first experiments in conductivity in about 1775 but he did not publish and his work went unknown until his notes were published by Maxwell in 1879 who felt that Cavendish had anticipated Ohm’s law by some…

A common use of high resistance measuring instruments (often called megohmmeters or insulation resistance testers) is measuring the insulation resistance of capacitors. Such tests are useful to quality engineers in the production of capacitive components, by design engineers to determine suitability for a particular application or at incoming inspection. …

More from our GenRad Museum Type 1680 Automatic Capacitance Bridge The 1680, designed by R. G. Fulks, was the first automatic bridge balanced electronically. It was announced in 1965. Not only could it measure and sort capacitors rapidly, but perhaps more important, it could also be controlled by an external computer…

Here’s a bit of GenRad history. INTRODUCTION WARNING This instrument is capable of delivering lethal energy. All loads and connections should be well insulated to avoid accidental contact. Always turn the OUTPUT to zero before disconnecting the load or changing the range. The OUTPUT SHORTED position of the OUTPUT control…

IET Labs is a premier calibration laboratory that is accredited by A2LA for Capacitance-Measure and Capacitance-Generate. We can calibrate most capacitance standards or capacitance decades from 10 aF — 10 F with some of the best measurement uncertainties, as good as 4.8 µF/F , of any commercial calibration laboratory. Please contact our sales staff, by phone or online, who will be pleased to give you a…