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2. Astrolabe - Wikipedia

   en.wikipedia.org/wiki/Astrolabe

   North African, 9th century CE, planispheric astrolabe. Khalili Collection. A modern astrolabe made in 2013, in Tabriz, Iran.. An astrolabe (Ancient Greek: ἀστρολάβος astrolábos, ' star-taker '; Arabic: ٱلأَسْطُرلاب al-Asṭurlāb; Persian: ستاره‌یاب Setāreyāb) is an astronomical instrument dating to ancient times.

3. Multimeter - Wikipedia

   en.wikipedia.org/wiki/Multimeter

   Analog multimeter Digital multimeter. A multimeter (also known as a volt-ohm-milliammeter, volt-ohmmeter or VOM) [1] is a measuring instrument that can measure multiple electrical properties. [2] [3] A typical multimeter can measure voltage, resistance, and current, [4] in which case can be used as a voltmeter, ohmmeter, and ammeter.

4. Voltmeter - Wikipedia

   en.wikipedia.org/wiki/Voltmeter

   Instruments permanently mounted in a panel are used to monitor generators or other fixed apparatus. Portable instruments, usually equipped to also measure current and resistance in the form of a multimeter are standard test instruments used in electrical and electronics work. Any measurement that can be converted to a voltage can be displayed ...

5. Source measure unit - Wikipedia

   en.wikipedia.org/wiki/Source_measure_unit

   A SMU integrates a highly stable DC power source, as a constant current source or as a constant voltage source, and a high precision multimeter. It typically has four terminals, two for source and measurement and two more for kelvin, or remote sense, connection. Power is simultaneously sourced (positive) or sinked (negative) to a pair of ...

6. Megohmmeter - Wikipedia

   en.wikipedia.org/wiki/Megohmmeter

   Megohmmeter M1101M. A Megohmmeter or insulation resistance tester, is a special type of ohmmeter used to measure the electrical resistance of insulators. [1] Insulating components, for example cable jackets, must be tested for their insulation strength at the time of commissioning and as part of maintenance of high voltage electrical equipment and installations.

7. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

8. Current clamp - Wikipedia

   en.wikipedia.org/wiki/Current_clamp

   Clamp meters are used by electricians, sometimes with the clamp incorporated into a general purpose multimeter. It is simple to measure very high currents (hundreds of amperes) with the appropriate current transformer. Accurate measurement of low currents (a few milliamperes) with a current transformer clamp is more difficult.

9. Tube tester - Wikipedia

   en.wikipedia.org/wiki/Tube_tester

   A tube with low emission will work perfectly fine in most circuits, and need not be replaced on that indication alone, unless it measures much lower than specified or if it indicates a short. A variation on the emission tester is the dynamic conductance tester, a type of tester developed by the Jackson Electrical Company of Dayton, Ohio. The ...