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Creates constant-amplitude variable frequency sine waves to test frequency response Transistor tester: Tests transistors Tube tester: Tests vacuum tubes (triode, tetrode etc.) Wattmeter: Measures power in a circuit Vectorscope: Displays the phase of the colors in color TV Video signal generator: Generates video signal for testing purposes Voltmeter
The advantage of an emission tester is that from all types of tube testers, it provides the most reliable warning of tube wear-out. If emission is at 70%, transconductance can be at 90% still, and gain at 100%. The best and most popular version used by the German army was the Funke W19 [citation needed].
The Leeb Rebound Hardness Test (LRHT) invented by Swiss company Proceq SA is one of the four most used methods for testing metal hardness. This portable method is mainly used for testing sufficiently large workpieces (mainly above 1 kg). [citation needed] It measures the coefficient of restitution. It is a form of nondestructive testing.
Tung-Sol created the 6550 vacuum tube, a specialized Hi-Fi audio tube in 1954. The 1956 Hewlett-Packard MODEL 650A Test Oscillator Operator and Service Manual indicated Tung-Sol as a replacement parts designated manufacturer without a part referenced in the specific model.
Eagle Test Systems was founded by Len Foxman and began providing test solutions in 1976. Since October 1, 2003, they have delivered over 600 test systems to more than 60 customers worldwide. Prior to being acquired by Teradyne, global headquarters were located at its manufacturing facility in Buffalo Grove, Illinois. There, Eagle Test Systems ...
The company also designed and made other electronic instruments such as signal generators, valve (vacuum tube) testers and valve characteristic meters and specialist equipment for radio servicing. Many of these were intended for both military and commercial use and were made to a very high standard.
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Despite continuing demand from customers, production was stopped in 2008, reportedly due to increasing problems with suppliers of mechanical parts. [16] The last meter to leave the factory was an AVOmeter Eight Mk 7 (Serial Number 6110-610/081208/5166) which was presented in February 2010 to the winner of a competition run by the Megger company.
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